HMP260 SERIES TRANSMITTERS Operating Manual HMP260-U017en-1.
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HMP260 SERIES Operating Manual HMP260-U017en-1.5 Contents 1. PRODUCT DESCRIPTION ......................................................................................... 1 2. TO BE NOTED WHEN MEASURING HUMIDITY ........................................................ 3 3. INSTALLATION.......................................................................................................... 4 4. 5. 3.1. Selecting the place of installation ...........................................................
HMP260 SERIES Operating Manual 5.4. 6. 7. ii HMP260-U017en-1.5 Serial commands ......................................................................................... 32 5.4.1. Analogue output commands............................................................ 32 5.4.1.1. Setting the analogue outputs ....................................................... 32 5.4.1.2. Selecting and scaling the analogue output quantities .................. 33 5.4.1.3. Scaling the analogue outputs ....................
HMP260 SERIES Operating Manual HMP260-U017en-1.5 8. 9. TECHNICAL DATA................................................................................................... 53 8.1. Relative humidity......................................................................................... 53 8.2. Temperature................................................................................................. 53 8.3. Calculated variables .........................................................................
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HMP260 SERIES Operating Manual HMP260-U017en-1.5 1. PRODUCT DESCRIPTION NOTE Before installing and using the HMP260 transmitter study carefully Appendix 2: SAFETY SUMMARY. The HMP260 series transmitters are associated electrical apparatuses. This means that the housing of the transmitter is mounted into a safe area and the sensor head and its cable can go to a potentially explosive environment (hazardous area). The transmitters incorporate a protective unit which contains the power limiting components.
HMP260 SERIES Operating Manual Options Calculation variables Serial interface Display cover Filters Cable length Installation aids 2 HMP260-U017en-1.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 2. TO BE NOTED WHEN MEASURING HUMIDITY In the measurement of humidity and especially in calibration, it is essential that temperature equilibrium is reached. Even a small difference in temperature between the measured object and the sensor causes an error. If the temperature is +20 °C (+68 °F) and the relative humidity 50 %RH, a difference of ±1 °C between the measured object and the sensor causes an error of ±3 %RH.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 3. INSTALLATION 3.1. Selecting the place of installation The transmitters should be installed in a place that gives a true picture of the environment or process and is as clean as possible. Air should circulate freely around the sensor. A rapid air flow is recommended; it ensures that the sensor head and the ambient air are at the same temperature. Install the transmitter in a place where no cold or hot spot can develop.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 3.2. Mounting HMP263/264/265 (EEx ia) IIC SAFE AREA HAZARDOUS AREA EEx ia IIC T3/T4 HMP263 sensor head Supply voltage 24 VDC Analog outputs (mA/V) RS 232C/ RS 485 /digital current loop . HMP264 sensor head for pressurized spaces HMP265 sensor head Fig. 3.1 Examples of sensor head mounting The lead-throughs must be sealed properly to avoid air flowing in or out from the channel. The sealings must fulfil EEx requirements.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 The transmitters should be mounted with the sensor head horizontally; this way, any water condensing on the tube cannot flow onto the sensors. When there is no alternative but to install the sensor head in the process vertically, the point of entry must be carefully insulated. The cable must also be allowed to hang loosely as in Figure 3.6; this prevents any condensed water from running onto the sensor head along the cable.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 NOTE When using the support bar the lead-through piece and the space between the duct wall and the flange must be sealed e.g. with silicon. The sealings must fulfil EEx requirements. The sensor head can also be installed vertically. when a bushing is used, its size is selected according to the diameter of the sensor head; the diameter of the cable increased by using e.g.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 3. Insert the body of the sensor head into the fitting body and screw the nut manually to the fitting body until the connection feels tight. 4. Mark both the fitting body and the nut hex. A pen nut fitting body 5. Tighten the nut a further 30° (1/12 turn) or if you have a torque spanner tighten it with a torque of 80 ±10 Nm. NOTE After detachment the nut must be tightened without increased effort. 30° 6.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 M22x1.5 Fasten by threaded sleeve Sealing by Metal sealing washer DIN 7603 threaded sleeve M22x1.5/Ø40 x15 (boring) sheet metal s=3...6mm Ø22+0.3 Fasten by Nut DIN 80705 Check the thickness of the sheet metal according to the pressure of the chamber nut DIN 80705-M22x1.5 (AISI 316) tightening torque=150 Nm ±10 Nm sealing by Metal sealing washer DIN 7603 NPT Conical pipe threaded connection 1/2-14 NPT ANSI/ASME B1.20.
HMP260 SERIES Operating Manual 3.2.3. HMP260-U017en-1.5 HMP265 transmitter SAFE AREA to be sealed to be insulated HAZARDOUS AREA Fig. 3.5 Installing a transmitter in a process with the sensor head horizontally SAFE AREA to be sealed to be insulated HAZARDOUS AREA Fig. 3.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 HAZARDOUS AREA a plugged hole for an Exi-approved reference meter SAFE AREA Fig. 3.7 Mounting the sensor head on a duct or channel When the sensor head is installed in a duct or a channel, the temperature difference of the air inside and outside the duct must be small as the sensor head conducts heat. 3.3. Grounding A single electrical cable with a screen and three to ten wires is recommended for power and analogue output/serial bus connections.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 3 flexible wires 0.5 mm 2 (AWG 20), stranded wires recommended 140 165 braid shielding tube brass disks braid 25 brass disks rubber ring nut D = Ø 7...
HMP260 SERIES Operating Manual HMP260-U017en-1.5 NOTE When the cable is grounded as above, the metallic parts of the sensor head, the shield of its cable, the transmitter housing and the shield of the signal cable to external system are all connected to each other. The transmitter housing must be grounded via the grounding terminal located at the lower right hand corner of the housing. In addition to this the negative terminal of the power supply must be grounded.
HMP260 SERIES Operating Manual CH1+ CH1CH2+ CH2- HMP260-U017en-1.5 CH1- and CH2- are connected together internally + + V mA V mA CURRENT/VOLTAGE OUTPUTS - EXTERNAL POWER SUPP 24 V + Do not use power supply ground (-) as output signal ground X2 X1 OPENED COVER OF THE HMP260 Fig. 3.8 Electrical connections Power supply 24 VDC Output signals 0...20 mA 4...20 mA 0...1 V 0...5 V 0...
HMP260 SERIES Operating Manual HMP260-U017en-1.5 4. COMMISSIONING When the HMP260 transmitters leave the factory, their measurement ranges and output signals have already been selected. The user can subsequently change the measurement units between metric and non-metric and select and scale the output signals with software functions, see Chapter 5 Commands and Appendix 1. 4.1. Security lock jumper Before the settings can be changed, the security lock jumper in connector X15 must be removed (see Fig. 4.
HMP260 SERIES Operating Manual CH2 CH1 HMP260-U017en-1.5 CH1 CH2 CH2 CH1 CURRENT OUTPUTS 0 ... 20 / 4 ... 20 mA CH1 CH2 CH2 CH1 VOLTAGE OUTPUTS 0 ... 5 V / 0 ... 10 V CH1 CH2 CH2 CH1 VOLTAGE OUTPUTS 0 ... 1 V CH1 CH2 CH1 0 ... 1 VOLTAGE OUTPUT CH2 CURRENT OUTPUT X15 OPENED COVER OF THE HMP260 Fig. 4.2 Selecting the analogue outputs with jumpers The software has to be informed which outputs are in use.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 X55 spare jumpers Fig. 4.3 4.3 Spare jumpers Connecting the RS 232C serial bus RX GND TX NC X6 Fig. 4.4 Serial bus connections To connect a PC to the HMP260 transmitters via the RS 232C serial bus, one of the following cables is required. The type of cable depends on the terminal and the connector type.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 D9S PC TXD 2 5 3 4 6 7 8 RXD TXD 3 7 2 D25S 5 6 8 20 TERMINAL RXD TXD 3 D25P 7 2 Fig. 4.5 RXD TX GND RX TX GND RX HMP 23 TX GND RX Connection of cables When the serial bus has been connected between the PC and the transmitter, the PC is switched on. When using a PC, a terminal emulation programme (e.g. Procomm Plus, Datastorm or Windows terminal) is started.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 The RS 232C screw terminal cannot be used if an RS 485/422 serial module or a digital current loop module is used. See appendices 3 and 4 on how to install and operate these modules. In calibrating or changing the settings of the transmitter it can be more convenient to use the connector X17, if connector X6 is already in use. This connector, however, transfers only RS 232 signals.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 jumper must be removed before the transmitter is reset. If the jumper is in place when power is turned on, the transmitter does not work. After jumper insertion the transmitter is in STOP mode, ready to receive commands. The same method is used when the transmitter is in POLL mode and the user has forgotten its address. NOTE Inserting a jumper in any other place in connector X16 voids the guarantee of the transmitter.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5. COMMANDS As the HMP260 transmitters are microprocessor based devices, their configuration can be set to correspond to the specific needs of the user. This is done through commands, either utilizing the menus on the local display or by giving commands through the serial interface (see Appendix 1). Most often the commands are used to change the settings of the two analogue channels.
HMP260 SERIES Operating Manual 5.2 HMP260-U017en-1.5 LED commands NOTE If the transmitter has a display/keypad cover, the LED commands cannot be used. LED commands can be used to operate the transmitters in the field. These commands can be used in humidity and temperature calibration and calibration of the analogue outputs. Open the housing and press any one of the three press switches. The LEDs will light up for 2...3 seconds. UP DOWN LEDs press switches ENT Fig. 5.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5.3 Display/keypad commands 5.3.1 Display mode In the display mode the transmitters output measurements on the display; different quantities can be scrolled with the arrow keys according to the variables selected when ordering the transmitter. After reset the transmitters are always in the display mode. The display also shows error messages and alarms if they occur. 5.3.2 Command mode Press the CL key to enter the command mode.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 numbers is ended with selecting a blank ' ' and pressing ENT. The last character entered can be deleted with CL. If CL or ENT key is pressed when the field is empty, the programme returns to the previous display. With some commands (e.g. calibration) the figures are changed using the arrow keys. When an arrow key is pressed continuously for a while, the numbers start changing at an increasing rate. 5.3.4 Analogue output commands 5.3.4.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 NOTE The analogue output jumpers must be set to right places (see Fig. 4.2). 5.3.4.2 Selecting and scaling the analogue output quantities Disconnect the security lock jumper! • Select Mode in the main menu and Analog outputs in the Mode menu: • Select Scale. The quantity and scaling for channel 1 are displayed: • If the settings are correct, press ENT.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5.3.5 Output via the serial bus 5.3.5.1 Turning the serial interface echo ON/OFF • Select More in the main menu, select More in the More menu and select Echo in the second More menu. • Use the arrow keys to select the right alternative and press ENT. 5.3.5.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 Selecting stop bits: Full duplex/half duplex: The processor does not allow the following combinations: • no parity, 7 data bits, 1 stop bit: if this combination is given the HMP260 programme will change the number of stop bits to 2 • even or odd parity, 8 data bits, 2 stop bits: if this combination is given the programme changes the number of stop bits to 1 NOTE The serial bus settings become effective only after reset. 5.3.5.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5.3.5.4 Selecting the output units • Select Unit in the main menu: • Use the arrow keys to select the right alternative and press ENT. RH T Td a x Tw 5.3.6 metric %RH °C °C g/m3 g/kg °C non-metric %RH °F °F gr/ft3 gr/lb °F Output modes The output modes only affect output through the serial interface: the transmitter accepts all display and LED commands irrespective of which serial output mode it is in.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5.3.6.1 Setting the serial interface operation mode • Select Mode in the main menu; the following is displayed: • Select Serial output: • The currently valid setting flashes. Select the desired mode with the arrow keys and press ENT. After this the programme returns to the Mode Menu.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 • Select More in the main menu, select More in the More menu and select Mtim in the second More menu: • Pressing ENT returns the programme to the main menu without changing the integration time. • If the integration time needs to be changed, press CL; enter the new integration time with the arrow keys (4...255) 5.3.7.2 Setting the pressure for mixing ratio and wet bulb calculations The atmospheric pressure has an effect on mixing ratio and wet bulb.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5.3.7.3 Setting the date • Select More in the main menu; select Date in the More menu: • If the date is correct, acknowledge it by pressing ENT; this takes the programme back to the More menu. • If the date needs to be changed, press CL.
HMP260 SERIES Operating Manual 5.4 HMP260-U017en-1.5 Serial commands More detailed descriptions of the serial commands can be found in Appendix 1. Here only the most commonly used command sequences are described. The instructions on how to connect the HMP260 transmitters to serial bus are given in Chapter 4.3. Pressing ESC always interrupts any serial command being given. In the commands stands for carriage return. 5.4.1 Analogue output commands 5.4.1.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5.4.1.2 Selecting and scaling the analogue output quantities Disconnect the security lock jumper! ASEL xxx yyy xxx yyy = = channel 1's quantity channel 2's quantity (RH, T, Td, Abs, Mix or Tw) Example: relative humidity selected on channel 1 and temperature on channel 2 ASEL RH T Ch1 (RH) lo 0.000 %RH Ch1 (RH) hi 100.000 %RH Ch2 (T ) lo -40.000 'C Ch2 (T ) hi +160.000 'C 5.4.1.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5.4.2 Output via the serial bus 5.4.2.1 Starting the measurement output R Starts output of measurements to the peripheral devices (RUN mode); the only available command is S (stop). The output mode can be changed with command FORM (see Appendix 1). 5.4.2.2 Stopping the measurement output S Ends the RUN mode; after this command all other commands are available. 5.4.2.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5.4.2.4 Setting the output interval for the RUN mode INTV xxx yyy xxx = yyy = output interval (0...255) 0: no pause between outputs unit (s, min or h) Example: output interval is changed into 10 minutes INTV 10 min Output intrv. : 10 min 5.4.2.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 5.4.2.6 Selecting the output units UNIT x x = m(etric units) n(on-metric units) RH T Td a x Tw 5.4.2.7 metric %RH °C °C g/m3 g/kg °C non-metric %RH °F °F gr/ft3 gr/lb °F Setting the transmitter address ADDR aa aa = address (0...99) Example: transmitter is given address 99 ADDR Address 5.4.2.8 : 2 ? 99 Resetting the transmitter RESET 5.4.3 Operating the transmitter via the serial bus 5.4.3.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 In POLL mode: measurements output only with command SEND. When in POLL mode, the output state is changed as follows: OPEN aa SMODE xxxx aa xxxx = = address of the transmitter STOP, RUN or POLL The OPEN command sets the bus temporarily in STOP mode so that the SMODE command can be given. Example: >SMODE STOP Serial mode : STOP 5.4.3.2 setting STOP mode OPEN & CLOSE OPEN nn nn = address of the transmitter (0...
HMP260 SERIES Operating Manual 6. HMP260-U017en-1.5 CALIBRATION The HMP260 transmitters have been fully calibrated at the factory and there should be no immediate need for recalibration. The transmitters should be calibrated only if there is reason to believe that the adjustments of the transmitters have changed. The adjustments of the temperature measurement channel and the analogue outputs are particularly stable and in normal circumstances there is no need to recalibrate them.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 NOTE If the sensor has been changed, the calibration has to be done according to the instructions in Chapter 6.1.3. 6.1.1. One point calibration procedure 6.1.1.1 Using serial commands Disconnect the security lock jumper! • Make sure that the sensors of the transmitter and the reference instrument are close to each other.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 6.1.1.3 Using LED commands Disconnect the security lock jumper! • Make sure that the sensors of the transmitter and the reference instrument are close to each other. Allow enough time for the sensor heads to stabilize to the measurement conditions • Connect an ammeter/voltmeter to the analogue outputs (connector X2); if the outputs are already connected e.g.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 • If you want to see how the sensor stabilizes to the humidity in the calibrator, enter c instead of the first reference: RH : 11.9 Ref1 ? c RH : 11.5 Ref1 ? c RH : 11.5 Ref1 ? 11.3 Press any key when ready... • Place the sensor head into the calibration hole of the NaCl bottle in the humidity calibrator. • Wait for 10 minutes. • Press any key and enter the second point value and press . RH : xx.x Ref2 ? yy.y • 6.1.2.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 • Wait for 10 minutes. • Connect an ammeter/voltmeter to the analogue outputs (connector X2). Give command ¡¡¡l. At the first calibration point the LED on the left flashes; adjust the first point (offset) with the arrow switches to the value given in the calibration table (Chapter 6.1.4) and press ENT switch. • Place the sensor head into the calibration hole of the NaCl bottle in the humidity calibrator. • Wait for 10 minutes.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 • Press any key and enter the second point value and press . RH : xx.x Ref2 ? yy.y • 6.1.3.2 The stabilization of the sensor can be monitored by entering c instead of the reference value. Using display commands Disconnect the security lock jumper! • Leave the calibrator and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap on the transmitter.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 • Check that the reading corresponds within the desired accuracy to the reading in the calibration table. If not, adjust the second point with the arrow switches to the correct value and press ENT. At the second calibration point the second LED from the left flashes. The basic capacitance of the new sensor may differ considerably from that of the previous one.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 6.2.1 One point offset correction 6.2.1.1 Using serial commands Disconnect the security lock jumper! • Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap prior to calibration. • Check the transmitter against the reference. • Give command CT and enter the first point value and press : CT 'T : xx.x Ref1 ? yy.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 6.2.1.3 Using LED commands Disconnect the security lock jumper! • Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap prior to calibration. • Check the transmitter against the reference. • Connect an ammeter/voltmeter to the analogue outputs (connector X2). Give command ¡¡l¡.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 • The stabilization of the sensor can be monitored by entering c instead of the reference value. 6.2.2.2 Using display/keypad commands Disconnect the security lock jumper! • Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap prior to calibration. • Check the transmitter against the reference.
HMP260 SERIES Operating Manual 6.3 HMP260-U017en-1.5 Calibration of analogue outputs The analogue outputs have been calibrated at the factory and since they are very stable, calibration of the outputs should be performed only when there is reason to believe that their adjustments have changed. 6.3.1 Using serial commands Disconnect the security lock jumper! ACAL The outputs on channels 1 and 2 are measured and the measured values (mA or V) entered as calibration coefficients.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 • Connect the meter to the output of channel 2 and enter the measured lower end current/voltage on channel 2. • Enter the measured upper end current/voltage on channel 2. 6.3.4 Using LED commands If both the analogue outputs and humidity/temperature channels are calibrated, the analogue outputs should be calibrated first.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 7. MAINTENANCE 7.1 Reference measurements Reference measurements are necessary for the verification of whether the transmitter readings are within specifications. This way the user can check if the transmitter needs calibration or service. The reference meter should preferably use the same technology as the instrument checked, i.e. transmitters with capacitive sensors should be checked with instruments using capacitive sensors.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 When errors have occurred, the transmitter outputs the error code (see Appendix 3 for all error messages): >ERRS E40 f ( all ) out of range > 7.3 Changing the HUMICAP® sensor and the filter Remove the damaged sensor and insert a new one. Handle the sensor by the plastic socket. DO NOT TOUCH THE SENSOR PLATE. After sensor change the humidity calibration must be done according to the instructions in Chapter 6.1.3.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 mA X2 CH1+ CH1CH1+ TEST POINTS Fig. 7.4 7.5 CH1- RL Circuit diagram of the analogue output current test points Adjusting the contrast of the display The contrast of the display can be adjusted using the trimmer "LCD display contrast" located next to the press switches.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 8. TECHNICAL DATA Specifications of the protection unit, see Appendix 9. 8.1 Relative humidity Measuring range 0...100 %RH Accuracy (including nonlinearity and repeatability) maximum achievable accuracy when calibrated against high quality, certified humidity standards: ±1 %RH (0...90 %RH) ±2 %RH (90...100 %RH) when calibrated against salt solutions (ASTM E104-85): ±2 %RH (0...90 %RH) ±3 %RH (90...100 %RH) 8.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 Accuracies of the calculated quantities depend on the accuracies of the measured quantities: relative humidity and temperature. In the tables below their accuracies are ±2 %RH and ±0.2 °C. Accuracy of dewpoint temperature (°C) Temp. -40 -20 0 20 40 60 80 100 120 140 160 Relative humidity 10 20 30 1.86 1.03 0.76 2.18 1.19 0.88 2.51 1.37 1.00 2.87 1.56 1.13 3.24 1.76 1.27 3.60 1.96 1.42 4.01 2.18 1.58 4.42 2.41 1.74 4.86 2.66 1.92 5.31 2.91 2.10 5.80 3.18 2.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 Accuracy of wet bulb temperature (°C) Temp. -40 -20 0 20 40 60 80 100 120 140 160 Relative 10 0.20 0.21 0.27 0.45 0.84 1.45 2.23 3.06 3.85 4.57 5.25 humidity 20 30 0.20 0.20 0.21 0.22 0.28 0.28 0.45 0.45 0.77 0.72 1.20 1.03 1.64 1.32 2.04 1.58 2.40 1.81 2.73 2.03 3.06 2.25 40 0.20 0.22 0.29 0.44 0.67 0.91 1.13 1.31 1.48 1.65 1.82 50 0.20 0.22 0.29 0.44 0.64 0.83 0.99 1.14 1.28 1.41 1.55 60 0.20 0.22 0.29 0.44 0.61 0.76 0.89 1.01 1.13 1.25 1.37 70 0.
HMP260 SERIES Operating Manual 8.7 56 HMP260-U017en-1.5 Connections screw terminals, 0.5 mm2 wires (AWG 20), stranded wires recommended Operating voltage 24 VDC (20...28 V) Power consumption 120 mA maximum (24 VDC) Recommended external load for current outputs <500 Ω Recommended external load for 0...1 V voltage output >2 kΩ (to ground) Recommended external load for 0...5 and 0...10 V voltage outputs >10 kΩ (to ground) Operating temperature (electronics) with display -40...+60 °C 0...
HMP260 SERIES Operating Manual Ø 13.5 Ø 13.5 HMP260-U017en-1.5 29 cable length 2000, 5000, 10 000 or 15 000 m 70 M22x1.5 HMP263 sensor head dimensions Ø 13.5 29 Fitting body hex=27 14 120 170 HMP264 sensor head dimensions Ø 25 Ø 13.5 Fig. 8.2 cable length 2000, Nut hex=32 5000, 10 000 or 15 000 m Ø13.5 Fig. 8.1 2.5 29 30 220 cable length 2000, 5000, 10000 or 15000 m Ø 9.5 Ø 55 Ø 75 Fig. 8.
HMP260 SERIES Operating Manual 8.8 HMP260-U017en-1.5 Electromagnetic compatibility The emission and immunity tests have been performed according to standards EN50081-1 and EN50082-2. NOTE These tests are valid with specified sensor protections only. Type: Sensor protection/notes: HMP263 PPS grid & stainless steel netting (part no. 16720) HMP264 sintered filter (part no. 16452) HMP265 sintered filter (part no. 16452), PPS grid & stainless steel netting (part no. 16720) 8.8.
HMP260 SERIES Operating Manual HMP260-U017en-1.5 9. 10.
HMP260-U017en-1.5 HMP260 SERIES Appendix 1: Serial commands SERIAL COMMANDS 1 ANALOGUE OUTPUT COMMANDS ............................................................................... 2 AMODE Setting the analogue outputs................................................................ 2 ASEL Selecting the scaling the analogue output quantities............................... 2 ASCL Scaling the analogue outputs ............................................................... 3 2 CALIBRATION COMMANDS........
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 1 ANALOGUE OUTPUT COMMANDS AMODE Setting the analogue outputs Disconnect the security lock jumper! AMODE a bb.bbb cc.ccc d ee.eee ff.fff a = bb.bbb = cc.ccc = d = ee.eee ff.fff = = channel 1: U = I = lower limit of channel 1 upper limit of channel 1 channel 2: U = I = lower limit of channel 2 upper limit of channel 2 voltage output current output voltage output current output The bb.bbb, cc.ccc, ee.eee and ff.
HMP260 SERIES Appendix 1: Serial commands ASEL Ch1 Ch1 Ch2 Ch2 HMP260-U017en-1.5 RH T (RH) lo (RH) hi (T ) lo (T ) hi 0.000 %RH ? 100.000 %RH ? -40.000 'C ? 0 +160.000 'C ? 100 When the ASEL command is given on its own, the transmitter outputs its current settings: ASEL Ch1 Ch1 Ch2 Ch2 (RH) (RH) (T ) (T ) lo hi lo hi 0.000 %RH 100.000 %RH -40.000 'C +160.000 'C The outputs and their scales can also be given directly with the ASEL command. ASEL xxx yyy aaa.a bbb.b ccc.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 The output scales can also be given directly with the ASCL command. ASCL aaa.a bbb.b ccc.c ddd.d aaa.a bbb.b ccc.c ddd.d = = = = lower limit of channel 1 upper limit of channel 1 lower limit of channel 2 upper limit of channel 2 For example, when relative humidity is scaled to 0...100 %RH on channel 1 and temperature to -40...+100 °C on channel 2: ASCL Ch1 Ch1 Ch2 Ch2 0 100 -40 100 (RH) lo 0.000 %RH (RH) hi 100.000 %RH (T ) lo -40.
HMP260 SERIES Appendix 1: Serial commands 2 HMP260-U017en-1.5 CALIBRATION COMMANDS CRH Relative humidity calibration Disconnect the security lock jumper! CRH With this command the transmitters can be calibrated against a reference. A one-point calibration can be done against an accurate transfer standard in the field and a two-point calibration using saturated salt solutions in controlled conditions. A two-point calibration is performed as follows: CRH RH : 12.00 Ref1 ? 11.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 FCRH Relative humidity calibration after sensor change Disconnect the security lock jumper! FCRH After humidity sensor change the transmitter must be calibrated using this command and the calibration must be done at two reference points. The calibration is performed as follows: FCRH RH : 1.90 Ref1 ? 11.3 Press any key when ready ... RH : 76.30 Ref2 ? 74.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 In one-point offset correction, the Ref2 prompt is acknowledged with : CT T : 0.80 Ref1 ? 0.0 Press any key when ready ... T : 75.50 Ref2 ? If the stabilization of the sensor to the temperature of the calibrator or the reference needs to be monitored, the measurement output can be repeated by giving command c at Ref1 and Ref2: CT T : 0.80 Ref1 ? c T : 0.40 Ref1 ? 0.00 Press any key when ready ... T : 56.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 LI Entering linear correction coefficients Disconnect the security lock jumper! LI The LI command is one way of calibrating the transmitters. LI RH offset : 0.000 ? -.6 RH gain : 1.000 ? T offset : 0.000 ? T gain : 1.000 ? .4 The factory settings are offset 0 and gain 1. The transmitter can be returned to its factory calibration by giving these values.
HMP260 SERIES Appendix 1: Serial commands 3 HMP260-U017en-1.5 OUTPUT VIA THE SERIAL BUS R Starting the measurement output R Starts output of measurements to the peripheral devices (PC display or printer); output interval is set with command INTV. The output format depends on the transmitter configuration and the variables in use. The order, however, is always the same: relative humidity, temperature, dewpoint temperature, absolute humidity, mixing ratio and wet bulb temperature.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 The output mode can be changed with command FORM. DSEND Outputting readings of all connected transmitters once DSEND All transmitters connected to the serial bus send their addresses and current measurement readings in an order defined by their addresses. After receiving DSEND command a transmitter sets a delay time according to its address value and sends the data after this delay. DSEND works also in POLL mode.
HMP260 SERIES Appendix 1: Serial commands ECHO HMP260-U017en-1.5 Turning the serial interface echo ON/OFF ECHO xxx xxx = ON or OFF When the echo is off, the commands given through the serial interface or the prompt > cannot be seen on the display. When the serial interface is in half-duplex mode, the echo is always off. Even then the ECHO command can indicate that echo is on. INTV Setting the output interval for the RUN mode INTV xxx yyy xxx = yyy = output interval (0...
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 FORM Setting the output format FORM "xxx...xxx" ? zzz...zzz xxx...xxx = zzz...zzz = old format new format The FORM command sets the format of the outputs generated in RUN mode and by SEND command. Please note that capital and small letters have different meanings. \UU..UU\ \TT..TT\ \DD..DD\ \AA..AA\ \XX..XX\ \WW..WW\ \uu..
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 An example of a format suitable for use in Microsoft Excel spreadsheets: FORM "xxx...xxx" ?\UUU.U\\t\TTT.T\\t\DDD.D\\t\AAA.A\\t\XXX.X\\t\WWW.W\\r\n The output is then: 47.4 22.4 10.6 9.4 8.0 15.4 FTIME Adding time to output FTIME xxx xxx = ON or OFF When FTIME is activated, the current time is output at the beginning of the output line. The time is set with command TIME.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 FDATE Adding date to output FDATE xxx xxx = ON or OFF When FDATE is activated, the current date is output at the beginning of the output line. The time is set with command DATE. After RESET or power on the current date is 1991-01-01. Activating the date output >fdate on Form. date >r 1995-03-10 1995-03-10 1995-03-10 1995-03-10 1995-03-10 ... : RH= RH= RH= RH= RH= ON 21.1 21.3 23.1 22.2 20.6 %RH %RH %RH %RH %RH T= T= T= T= T= 26.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 ADDR Setting the transmitter address ADDR aa aa = address (0...99) The address is used when more than one transmitter is connected to one serial bus. The ADDR command makes it possible to communicate with one transmitter at a time in POLL mode.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 OPEN aa SMODE xxxx aa xxxx = = address of the transmitter STOP, RUN or POLL The OPEN command sets the bus temporarily in STOP mode so that the SMODE command can be given. For example: >SMODE Serial >SMODE Serial mode : STOP STOP mode : STOP which mode is in use at the moment setting STOP state OPEN & CLOSE OPEN nn nn = address of the transmitter (0...
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 4 OTHERS ITEST Testing the analogue outputs ITEST or ITEST a b a b = = current/voltage of channel 1 current/voltage of channel 2 The operation of the analogue outputs can be tested by forcing the outputs to given values which can then be measured with a current/voltage meter from the analogue outputs. The response to ITEST command gives six outputs/parameters.
HMP260 SERIES Appendix 1: Serial commands MTIM Mtim : HMP260-U017en-1.5 4 ? 5 or MTIM 5 Mtim : 5 PRES Setting the pressure for mixing ratio and wet bulb calculations PRES pppp.pp pppp.pp = pressure (hPa) The atmospheric pressure has an effect on mixing ratio and wet bulb. Accurate calculations can be achieved only when the ambient pressure is taken into consideration.
HMP260 SERIES Appendix 1: Serial commands HMP260-U017en-1.5 or pressure is set to zero using XPRES. After this the pressure stored using command PRES is valid again. CDATE Entering calibration date CDATE xxxxxx xxxxxx = calibration date (000101...991231) When the latest calibration date has to kept in memory, it is entered as follows: CDATE 940506 If the command is given without the date, the transmitter outputs the latest calibration already in memory.
HMP260 SERIES Appendix 1: Serial commands VERS HMP260-U017en-1.5 Name and version of the programme VERS For example: VERS HMPS 260 / x.yy where x.yy is the programme version. ? Outputting the transmitter settings ? For example: ? HMPS 260 / 1.01 CPU serial nr : 0 Keyboard type : 0 Address : 7 Output units : metric Baud P D S : 4800 E 7 1 FDX Serial mode : STOP Output intrv. : 0 min Mtim : 32 Pressure : 1013.25 Analog outputs Ch1 0.00 ... 10.00 V Ch2 0.00 ... 10.
HMP260 SERIES Appendix 2: Safety summary HMP260-U017en-1.5 SAFETY SUMMARY In this summary the following symbols are used: WARNING A WARNING denotes a hazard. It calls attention to a procedure, practice, condition or the like, which, if not correctly performed or adhered to, could result in injury or death to personnel. CAUTION A CAUTION denotes a hazard.
HMP260 SERIES Appendix 2: Safety summary HMP260-U017en-1.5 CAUTION Only fuses with the required current rating and of the specified type may be used. Do not use a substitute for the right fuse and never short-circuit the fuse holder. WARNING Always use the grounding terminal to connect the transmitter to safety ground. CAUTION All the component boards are grounded via the housing frame. Make sure that the fixing screws of the boards are firmly tightened before cables are connected.
HMP260-U017en-1.5 HMP260 SERIES Appendix 3: RS 485/422 serial port module INSTALLING AND USING THE RS 485/422 SERIAL PORT MODULE 1 INSTALLATION........................................................................................................... 2 2 OPERATION................................................................................................................ 3 3 NETWORK CONFIGURATION ....................................................................................
HMP260 SERIES Appendix 3: RS 485/422 serial port module 1 HMP260-U017en-1.5 INSTALLATION Switch the transmitter off. Resistors R2, R3 and R4 between connectors X4 and X5 in the component board in the cover of the transmitter are removed with side-cutting pliers. The module is plugged in connectors X4 and X5 on the main board of the HMP260 transmitter; connector X1 on the module board to connector X4 and connector X2 to connector X5.
HMP260 SERIES Appendix 3: RS 485/422 serial port module HMP260-U017en-1.5 2 OPERATION The HMP260 transmitters can either be given an address or operated without an address. Both single and dual loop wiring with half duplex connection can be used. No address is needed when only one HMP260 transmitter is used; when several transmitters are connected to the same line, each transmitter must be given an address in the initial configuration.
HMP260 SERIES Appendix 3: RS 485/422 serial port module HMP260-U017en-1.5 The RS 485/422 module has separate lines for transmitting and receiving, but they can be connected together with jumpers. Dual loop connection is the factory setting; when a single loop connection is used, the positions of jumpers in connector X4 on the module must be changed. The HI of the receiving line is approx. 0.6 V and its LO is approx. 0 V in order to reduce noise on the lines when no data is transferred (idling).
HMP260 SERIES Appendix 3: RS 485/422 serial port module HMP260-U017en-1.5 3 NETWORK CONFIGURATION Single loop operation Bidirectional data on one pair is one of the great advantages of the RS 485 line. Set jumpers in connector X4 on the module board as shown in the figure below. X1 X2 X4 X4 This jumper setting connects RX HI to TX HI and RX LO to TX LO and selects only one common line termination. The HI and LO terminals of the RX pair can now be used for operation.
HMP260 SERIES Appendix 3: RS 485/422 serial port module • Set the address of the transmitter; it can be any number between 1 and 99. In this example the address is 22: >addr 22 Address • HMP260-U017en-1.5 : 22 Set the serial bus settings according to your network specifications. This setting will become valid after next RESET or power off: >seri 2400 e 7 1 h 2400 E 7 1 HDX • Set the transmitter in POLL mode: >smode poll Serial mode : POLL NOTE 1 The SMODE command must be given last.
HMP260 SERIES Appendix 3: RS 485/422 serial port module HMP260-U017en-1.5 • Open the transmitter cover. • Pull out the RS 485/422 serial port module, if it is already mounted. • Set the serial port of the terminal to 4800 baud, even parity, seven data bits and one stop bit, full duplex (4800 E 7 1 FDX). • The serial settings of the transmitter must also be 4800 E 7 1 FDX and the transmitter must be in STOP mode. If these factory settings have been changed, they must be changed back.
HMP260 SERIES Appendix 3: RS 485/422 serial port module HMP260-U017en-1.5 NOTE 2 The transmitter outputs no prompt (>) after the SMODE POLL command and it only reacts to commands which include its address. • Check that the transmitter responds to its address: >send 22 RH= 24.4 %RH T= 29.1 'C • Disconnect the terminal. • Check that the jumpers in connector X4 are in the right place X1 X2 X4 X4 • Remount the RS 485/422 serial module. • Close the cover.
HMP260 SERIES Appendix 3: RS 485/422 serial port module HMP260-U017en-1.5 4 CHECKING THE SERIAL PORT NETWORK OPERATION Normally measurement readings are asked when the transmitter is in POLL mode; the command must then include the address of the transmitter. If the settings of the transmitter need to be changed, the transmitter is switched to STOP mode with command OPEN; commands can then be given without address. When the line to the transmitter is closed, it returns to POLL mode.
HMP260 SERIES Appendix 3: RS 485/422 serial port module HMP260-U017en-1.5 POLL mode If a transmitter has been set to POLL mode, it will respond only to commands sent with its address: send 22 RH= 24.4 %RH T= 29.1 'C Addresses from 1 to 99 can be used. According to the RS 485/422 standard a maximum of 32 devices can be connected on same bus, but the number can be increased if the line length and/or baud rate is reduced. More than one baud rate can be used on an RS 485 line. E.g.
HMP260-U017en-1.5 5 HMP260 SERIES Appendix 3: RS 485/422 serial port module SPECIFICATIONS Connections on the main board Berg sockets screw terminals 0.5 mm² wires, stranded wires recommended Assembly plug-in module Board dimensions 40 x 28 mm Operating mode (single or dual pair wiring) half duplex Network: network type cable type line length max. number of devices data speed operating mode common mode voltage range daisy chain twisted pair 1000 m (3000 ft) 32 devices on line 9600 baud max.
HMP260-U017en-1.5 HMP260 SERIES Appendix 4: Digital current loop module INSTALLING AND USING THE DIGITAL CURRENT LOOP MODULE INSTALLING AND USING THE DIGITAL CURRENT LOOP MODULE ...................................... 1 1 INSTALLATION ............................................................................................................ 2 2 OPERATION................................................................................................................. 3 3 NETWORK CONFIGURATION .........
HMP260 SERIES Appendix 4: Digital current loop module INSTALLATION Switch the transmitter off. Resistors R2, R3 and R4 between connectors X4 and X5 in the component board in the cover of the transmitter are removed with side-cutting pliers. The module is plugged in connectors X4 and X5 on the main board of the HMP 260 transmitter; connector X1 on the module board to connector X4 and connector X2 to connector X5. RX GND TX X17 Current loop module X2 X1 D AT A LOOPS 1 HMP260-U017en-1.
HMP260 SERIES Appendix 4: Digital current loop module HMP260-U017en-1.5 2 OPERATION The HMP260 transmitters can either be given an address or operated without an address. Both single and dual loop wiring with half duplex connection can be used. No address is needed when only one HMP260 transmitter is used; when several transmitters are connected to the same line, each transmitter must be given an address in the initial configuration.
HMP260 SERIES Appendix 4: Digital current loop module HMP260-U017en-1.5 The digital current loop module has separate lines for transmitting and receiving. Both single loop wiring and dual loop wiring can be used (see figure). Dual loop connection makes it possible to have a few more transmitters on the same loop pair. A single loop connection has simpler wiring. Data transmission is achieved by switching the loop current on and off.
HMP260 SERIES Appendix 4: Digital current loop module HMP260-U017en-1.5 3 NETWORK CONFIGURATION Single loop operation Bidirectional data on one pair and galvanic isolation are the advantages of the current loop. Single pair/dual pair use is configured through wiring (see figure on page 3). Supplying power from the same end to the loops prevents crossover voltages. • Connect wires to the transmitter's serial connector. • Check the wiring.
HMP260 SERIES Appendix 4: Digital current loop module • HMP260-U017en-1.5 Set the transmitter in POLL mode: >smode poll Serial mode : POLL NOTE 1 The SMODE command must be given last. NOTE 2 The transmitter outputs no prompt (>) after the SMODE POLL command and it only reacts to commands which include its address. • Check that the transmitter responds to its address: send 22 RH= 24.4 %RH T= 29.1 'C • Disconnect the terminal. • Remount the digital current loop module. • Close the cover.
HMP260 SERIES Appendix 4: Digital current loop module HMP260-U017en-1.5 Dual loop wiring • Set the address of the transmitter, it can be any number between 1 and 99. In this example the address is 22: >addr 22 Address • : 22 Set the serial bus settings according to your system.
HMP260 SERIES Appendix 4: Digital current loop module 4 HMP260-U017en-1.5 CHECKING THE SERIAL PORT NETWORK OPERATION Normally measurement readings are asked when the transmitter is in POLL mode; the command must then include the address of the transmitter. If the settings of the transmitter need to be changed, the transmitter is switched to STOP mode with command OPEN; the commands can then be given without address. When the line to the transmitter is closed, it returns to POLL mode.
HMP260 SERIES Appendix 4: Digital current loop module HMP260-U017en-1.5 POLL mode If a transmitter has been set to POLL mode, it will respond only to commands sent with its address: send 22 RH= 24.4 %RH T= 29.1 'C Addresses from 1 to 99 can be used. According to the 20 mA current loop standard current flows with no transmission on line. A maximum of 6 devices can be connected on same single loop line, but the number can be raised to 9 by using dual loop wiring.
HMP260 SERIES Appendix 4: Digital current loop module 5 HMP260-U017en-1.5 SPECIFICATIONS Galvanic isolation 1500 VAC/DC max. (1 min) Loop supply voltage 40 V max. Loop supply current must be current limited 20 mA nominal Operating loop voltage requirement 4 V/each transmitter (TX+/TX-) on the loop 2 V/each receiver (RX+/RX-) on the loop Loop current 12...30 mA (space) 0...2 mA (mark) 30 mA max. Connections on the main board Berg sockets screw terminals 0.
HMP260 SERIES Appendix 5: Error messages HMP260-U017en-1.5 ERROR MESSAGES The HMP260 transmitters go through a self-diagnostics procedure when the power is switched on. When the procedure does not reveal any errors or faults, the transmitter starts operating normally. If errors or faults are found, the transmitter outputs an error message. The error messages can be divided into two groups: error messages after reset and error messages during operation.
HMP260 SERIES Appendix 5: Error messages HMP260-U017en-1.5 Errors during operation There are two types of errors that may occur during the operation of the transmitters. The first type indicates that no frequency comes from the converter.
HMP260 SERIES Appendix 5: Error messages HMP260-U017en-1.
HMP260 SERIES Appendix 6: Calculation formulas HMP260-U017en-1.5 1 CALCULATION The HMP260 series transmitters measure relative humidity and temperature. From these values dewpoint, mixing ratio and absolute humidity are calculated using the following equations Td = dewpoint: Tn m −1 RH I F log Pws ⋅ H 100 ⋅ A K x = 621. 98 ⋅ RH ⋅ mixing ratio: Pws 100 ⋅ p − RH ⋅ Pws b absolute humidity: a = 216. 68 ⋅ RH ⋅ where Td = (1) g Pws 100 ⋅ t + 273.
HMP260 SERIES Appendix 6: Calculation formulas 2 HMP260-U017en-1.5 CORRECTIONS AT HIGH PRESSURE The saturation pressure of water vapour calculated with equation (4) is accurate only in vacuum where water vapour is the only gas present. In presence of other gases the real saturation pressure of water vapour Pws will rise. At pressure levels up to the normal atmospheric pressure this effect causes only a minimal error in the calculated variables and can therefore be ignored.
Ltr Change Qty Reason/ Design ECO no Date Review Date Appr Note ! The cable shield has to be connected to the cable bushing for full EMC protection. In automation system galvanically isolated inputs are recommended for current signals To control system RS 232 RX (To control system) Supply voltage 24 VDC max.
Ltr Change Qty Reason/ ECO no Design Date Review Date Appr Installation examples of intrinsically safe operation for transmitter types HMP263/264/265. HMP263/264/265 [EEx ia] IIC SAFE AREA HAZARDOUS AREA EEx ia IIC T3/T4 Probe types and example installations: cable length max.
HMP260 SERIES Appendix 9: Approvals HMP260-U017en-1.5 APPROVALS AND SPECIFICATIONS OF THE PROTECTION UNIT The transmitter conforms to the European Standards EN 50014 and EN 50020 and meets the requirements with the following marking of the type and protection: transmitter [EEx ia] IIC and sensor heads EEx ia IIC T3/T4. Protection Unit HMP 260PU Operating temperature with display cover -40...+60 °C 0...+50 °C Operating humidity 0...
