Instruction Manual HI 720 Conductivity Process Controller with Inductive Probe w w w . h a n n a i n s t .
TABLE OF CONTENTS WARRANTY .....................................................................................................4 PRELIMINARY EXAMINATION ............................................................................5 MODEL IDENTIFICATION ..................................................................................5 GENERAL DESCRIPTION & THEORY OF OPERATION .......................................... 6 SPECIFICATIONS .........................................................................
Dear Customer, Thank you for choosing a Hanna Instruments product. Please read this instruction manual carefully before using the instrument. It will provide you with the necessary information for correct use of the instrument, as well as a precise idea of its versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com or see the back cover for our worldwide contact list. This instrument is in compliance with the CE directives.
GENERAL DESCRIPTION & THEORY OF OPERATION This instrument allows conductivity measurements without any electrical contact between electrodes and process fluid. The measurement is based on inductive coupling of two toroidal transformers by the liquid. The instrument supplies a high frequency, reference voltage to the “Drive Coil”, and a strong magnetic field is generated in the toroid. The liquid passes through the hole in the toroid and can be considered as oneturn secondary winding.
The main features of the HI 720 controller series include: • Measurement and control of conductivity or concentration • Concentration can be measured as usual TDS (fixed ratio) or through custom conductivity/temperature/concentration curves • Customizing temperature coefficient table and NaCl temperature compensation according to IEC 746-3, in addition to the standard linear compensation • Auto-ranging • Display reading offset adjustment for temperature • Temperature level alarm • Cleaning in place activate
FUNCTIONAL DESCRIPTION 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
INSTALLATION Mechanical Dimensions It is also possible to use a separate Pt100/Pt1000 temperature probe. In the case of shielded wire, connect the shield to pin 4. In the case of a 2-wire sensor connect the Pt100/Pt1000 to pins 1 and 3, and short pins 2 and 3 with a jumper wire. If the Pt100/Pt1000 probe has more than 2 wires, connect the two wires of one end to pins 2 and 3 (pin 2 is an auxiliary input to compensate for the cable resistance) and one wire from the other end to pin 1.
OPERATIONAL GUIDE The HI 720 process controller can operate in six main modes: • Setup mode • Calibration mode • Control mode • Idle mode • Last calibration data viewing mode • Diagnostic mode (active errors & event log file scrolling) All operating modes are described in the following sections. SETUP MODE The Setup mode allows the user to set all needed characteristics of the meter. To enter the mode, press the SETUP key and enter the password when the device is in idle or control mode.
This table lists all available setup items together with their code, short description, valid values and default setting. Setup Item Description GENERAL SETTINGS G.00 Measurement mode (see note 8) G.01 Conductivity range G.02 G.03 TDS range Concentration unit (see note 31) G.04 Concentration format G.05 TDS factor G.06 Moving average length (see note 30) G.10 Factory ID G.11 Process ID alias RS485 address G.13 Language G.14 LCD contrast G.15 LCD backlight G.98 Calibration password (see note 2) G.
Setup Item Description Valid Values Curve 1/2/3/4 Table (see note 34) d.03 Not compensated 0 to f.s. conductivity value for the triplet selected in d.02 d.04 Temperature value for -30.0 to 130.0°C the d.02 triplet d..05 Concentration value 0 to f.s for the d.02 triplet CONTROL C.00 Control enable On, Off Setpoint 1 C.10 Setpoint 1 mode Disabled, (M1) On/Off high, (see note 1) On/Off low, PID high (if available), PID low (if available) C.11 Setpoint 1 value 0 to f.s. (S1) (see note 1) C.12 Setpoint 1 0 to f.
Setup Item Description Other Parameters C.70 Hold mode end delay C.80 On/Off control action delay (note 26) OUTPUT Relays O.01 Relay 1 mode (see notes 16, 17) O.02 O.03 Relay 2 mode (see notes 16, 17) Relay 3 mode (see notes 12, 16) O.04 Relay 4 mode (see notes 12, 16) O.05 Hold digital output Analog Output 1 O.10 Analog output 1 mode (notes 1, 17) O.11 Analog output 1 type O.12 Analog output 1 minimum value (O_VARMIN1) 20 Valid Values Default 00 to 99 seconds 00:00 to 30:00 min.
Setup Item INPUT I.00 Description Valid Values Default Input selection Inductive probe or Inductive (note 10) Digital transmitter probe I.03 Digital transmitter 00 to 99 00 address (active if I.00=Digital transmitter) I.04 Digital transmitter 1200, 2400, 4800, 19200 bps baud rate 9600 or 19200 bps I.10 Calibration timeout 0 to 12 months 12 months I.11 Life check Disabled, Disabled (see notes 9, 20) 1 hour, 2 hours, or 4 hours REAL TIME CLOCK (see Note 4) r.00 Current day 01 to 31 from RTC r.
Setup Item Description ERROR CONFIGURATION E.01 Low alarm (01) E.02 Max relay ON time error (02) E.03 Life check error (03) (see note 9) E.10 Conductivity input overflow (10) E.12 Calibration timeout (12) E.20 Broken temperature probe (20) 24 Valid Values Default Alarm relay -------------> On 22 mA fault current----> Off 3.6 mA fault current---> On Auto cleaning ----------> Off SMS sending -----------> Off Alarm relay -------------> On 22 mA fault current----> On 3.
Setup Item Description ERROR CONFIGURATION E.91 EEPROM corruption (91) E.92 Watchdog error (92) E.99 Level or pulse signal (note 11) TEST t.00 t.01 t.02 t.03 t.04 t.05 t.06 t.07 Valid Values Default Alarm relay -------------> On 22 mA fault current----> On 3.6 mA fault current---> Off SMS sending -----------> Off Alarm relay -------------> Off 22 mA fault current----> On 3.
( 3 ) When a wrong setup code or value is confirmed, the controller does not move from the current window, and displays a blinking WRONG message till the user changes the value. Note that the allowed values for some parameters depend from other settings (e.g. to set a high setpoint to 10.00 mS, first set the high alarm to a value greater than 10.00 mS). ( 4 ) Each time the controller is powered, the RTC is checked to detect if an RTC reset occurred since last software initialization.
TDS values in setup (excluding the temperature compensation table and the concentration curves) are automatically updated, so that the “new value / new f.s.” = “previous value / previous f.s.“ ( 9 ) A life check error is generated if the reading does not vary more than 0.5% of the current f.s. within the time period selected through the “life check time” setup item. ( 1 0 ) When a Digital Transmitter is used, temperature and conductivity are measured by the transmitter, and sent to the process controller.
If the item P.14 has been set to “222”, no expiration date check will be done. ( 2 6 ) This item is particularly useful in noisy environment, to filter measurement spikes and avoid undesired activations of the on/off control contacts. The relay energizes and de-energizes only if the corresponding threshold is overridden for more than the configured contact action delay (see below graph: “dly” is the contact action delay; relays are energized and de-energized at times tn+dly).
CALIBRATION MODE The controller is factory calibrated for temperature as well as for the analog outputs. The user should periodically calibrate the instrument for the conductivity range. For greatest accuracy, it is recommended to standardize the probe with a calibration solution close to the expected sample value. • While in idle or control mode, press the CAL key to enter the calibration mode and the meter will ask for password. Either the general or the calibration password can be used to enter the mode.
• Use a Checktemp or another calibrated thermometer with a resolution of 0.1° as reference thermometer, and immerse the temperature sensor in the ice bath as near to the Checktemp as possible. • Confirm the calibration option and the instrument will start the automatic calibration of the first point. • When the reading becomes stable, the instrument will ask confirmation. • Press CFM to confirm and proceed with the second point, or CAL to exit without saving.
If the “hold mode” is selected for the relay, then it is energized only when the meter is in hold mode. In this case there is no time boundary for the relay ON state. Relays 3 and 4 can be configured to operate in three modes: 1. simple cleaning 2. advanced cleaning 3. hold mode ON/OFF Control Mode Once a relay is enabled (set 1, set 2), the setpoint can be configured to be activated as a high (“OOHI”) or low limit (“OOLO”).
A simple and profitable procedure is described in this manual and can be used in almost all applications. The user can vary five different parameters, i.e. setpoint value (S1 or S2), deviation (D1 or D2), reset time, rate time and proportional control mode period Tc . Note The user can disable the derivative and/or integrative action (for P or PI controllers) by setting Td = 0 and/or Ti = MAX (Ti), respectively, through the setup procedure.
The Fail Safe mode is accomplished by connecting the external alarm circuit between the FS•C (Normally Open) and the COM terminals. This way, an alarm will warn the user when measurement overtakes the alarm thresholds, power fails, or the wire connecting the process meter with the external alarm circuit breaks. Note To activate the Fail Safe feature, an external power supply must be connected to the alarm device.
DIAGNOSTIC MODE The diagnostic mode allows the user to check if some errors are still active on the controller, or view the event log file. To enter (and exit at any time) this mode, press the DIAG key. Select the desired option with the up & down arrow keys, and then confirm the selection by pressing CFM. Active Errors This option allows the user to check which errors are active on the controller, and therefore provide proper actions. Each error is displayed together with the corresponding code.
TEMPERATURE COMPENSATION If the setup item b.01 is set to ATC, then an automatic temperature compensation of the conductivity readings will be performed using the temperature values acquired through the Pt100/Pt1000 input. If the temperature probe is not connected or it provides an invalid temperature (outside the -30 to 130°C range), the instrument will generate a “broken temperature probe” error, which will be handled as stated in the error configuration.
CONCENTRATION CURVES The instrument allows the user to insert up to 4 concentration tables, and each table is defined by up to 25 triplets of conductivity (K), temperature (T) and concentration (C) values. Note that all conductivity values in this section are actual values (i.e. not compensated for temperature variation). The user-defined concentration table then allows to calculate the concentration from conductivity and temperature values, only if the triplets satisfy the following conditions: 1.
HOLD MODE This function is started by: • calibration • setup • cleaning in place • the hold digital insulated input (there are two digital insulated inputs: one for hold mode and one for the advanced cleaning) when it is on; normally the signal level is polled at least every 4 seconds • the proper key combination (CFM and up arrow keys together) for service; the same key combination is used both to start and stop the hold mode (the key combination acts in the same way as the hold digital input • the daily p
IN-LINE CLEANING The cleaning feature allows an automatic cleaning action of the electrodes. To perform cleaning, the controller activates an external device (pump). Cleaning actions never take place if no relay is configured for cleaning. Moreover, the Advanced Cleaning requires both relays 3 and 4 to be configured for it.
COMMUNICATION For remote interaction with your controller, enter the setup mode, confirm the “Communication” menu, and select the “Connection type” from among 4 available options: • PC • HI 504900 GSM module • HI 504901 GSM supervisor • HI 504902 Modem PC COMMUNICATION Choose the “PC” connection type to communicate with the controller from your PC, through an RS485 network and the HI 92500 Windows® compatible software. RS485 standard is a digital transmission method that allows long lines connections.
RS485 Protocol for HI 720 Commands are composed of four parts: address, command identifier, parameter, end of command. The end of command corresponds to the CR char (0x0d). Some commands are used when the master is requesting information from the controller, others when the master wants to set a parameter in the process memory (RAM or EEPROM). The master software must send the command string with a maximum delay of 20 ms between each character.
b.33, d.03: P2 = 0 if range is 1999 μS/cm if range is 19.99 mS/cm P2 = 1 if range is 199.9 mS/cm P2 = 2 if range is 2000 mS/cm P2 = 3 C.11, C.12, C.13, C.21, C.22, C.23, C.30, C.31, C.34, O.12, O.13, O.15: if G.00 = “Conductivity” or “TDS” if range is 1999 μS/cm or 1000 ppm P2 = 0 if range is 19.99 mS/cm or 10.00 ppt P2 = 1 if range is 199.9 mS/cm or 100.0 ppt P2 = 2 if range is 2000 mS/cm or 1000 ppt P2 = 3 if G.
For all items with a fixed set of choices, blank spaces on the left of the value displayed are replaced with “*” (as many “*” characters are needed to reach the maximum string length, which is for example 3 for item C.57). Blanks must be put on the tail for all items in order to have always a total length of 6 characters (see the setup table for item lengths). The same parameter format used for setup item setting is also used for setup item getting (i.e.
Examples of answer to the ECR command are: • NN02.16mSC= 2.16 mS/cm, control is ON & alarm is OFF • NN1886uSN= 1886 μS/cm, control is OFF • NN00.94pptA= 0.94 ppt, control and alarm are ON • NN>>>.>mSN= overflow (range 199.9 mS/cm), control is OFF The answer to the TMR command is: “NNS” where “S” means “status” and can be equal to: • “A”, i.e. control and alarm are ON • “C”, i.e. control is ON and alarm is OFF • “N”, i.e.
The meaning of “start_datei” and “start_timei” is: • for errors: date and time at which the error was generated • for setup events: date and time of a setup item change • for calibration events: date and time of a calibration • for cleaning events: start date and time of cleaning action The meaning of “end_datei” and “end_timei” is: • for errors: end date and time if the error is not active anymore • for setup events: not used • for calibration events: not used • for cleaning events: not used The token form
B1 bit 1 Temperature outside the user concentration table B1 bit 2 Conductivity outside the user concentration table B1 bit 3 Concentration outside the user concentration table B1 bit 4 free for future use (and set to 0) B1 bit 5 free for future use (and set to 0) B1 bit 6 free for future use (and set to 0) B1 bit 7 free for future use (and set to 0) Each bit is equal to 1 if the correspondent error is ON, and equal to 0 if the correspondent error is OFF (error is always off and the bit equal to 0 if the co
The communication baud rate is set through the item P.01 and it will be the same for any connection type. To have an error associated with the SMS service, the proper configuration has to be selected in the “Error Menu”.
When the SIM card is recharged, its expiration date has to be manually updated (setup items P.17 to P.19). The instrument compares the expiration date with the current date (from RTC), and two weeks before the expiration date the following message is sent to the programmed phone number(s): “Rem_msg: xxx; The HI720 SIM card will expire on: DD-MM-YYYY. Please recharge or substitute it”. The same message will also be sent one week before and the day before the expiration date.
Many devices can be monitored through a remote modem, simply connecting all the devices and the modem (or cellular module) to the same RS485 network. Only one device can be configured through the item P.02 to answer to modem calls, and this will control the modem or cellular module. To avoid conflicts, never do any of the following actions: • put more than one modem or cellular module in the same RS485 network • set P.02 to “On” in more than one device in the same RS485 network • set P.
(*): When the digital transmitter is used, these errors are generated in the digital transmitter, but they are handled as if they were generated in the controller. ALARM - ERROR CONFIGURATION This section is dedicated to all the possible error causes for alarm generation, and to the actions performed according to the alarm configuration (setup menu “Error configuration”).
3. EEPROM data corruption in the transmitter 4. Digital transmitter is not calibrated 5. Other failures in the transmitter excluding: life check error, conductivity input overflow, or temperature probe broken error These errors are handled separately and exactly in the same way as if they were generated in the controller. To understand which cause generated the “Digital Transmitter error”, the digital transmitter must be examined.
If the checksum fails, a fault alarm is generated according to the user configuration for the EEPROM corruption error (see “Alarm - Error configuration” section), and the user will be asked to confirm or ignore a request of EEPROM reset. If the request is ignored, the controller restarts operation, but alarm actions are performed as configured by the user (see “Alarm - Error configuration” section). Note that the device will be in Hold mode in any case.
ACCESSORIES INDUCTIVE CONDUCTIVITY PROBES CONDUCTIVITY CALIBRATION SOLUTIONS HI HI HI HI HI HI HI HI HI HI 7030L 8030L 7031L 8031L 7034L 8034L 7035L 8035L 7039L 8039L 12880 μS/cm, 500 mL bottle 12880 μS/cm, 500 mL FDA bottle 1413 μS/cm, 500 mL bottle 1413 μS/cm, 500 mL FDA bottle 80000 μS/cm, 500 mL bottle 80000 μS/cm, 500 mL FDA bottle 111800 μS/cm, 500 mL bottle 111800 μS/cm, 500 mL FDA bottle 5000 μS/cm, 500 mL bottle 5000 μS/cm, 500 mL bottle PROBE CLEANING SOLUTIONS HI HI HI HI 7061M 7061L 8061M
Recommendations for Users Before using these products, make sure that they are entirely suitable for the environment in which they are used. Operation of these instruments in residential areas could cause unacceptable interferences to radio and TV equipment. To maintain the EMC performance of equipment, the recommended cables noted in the user's manual must be used. Any variation introduced by the user to the supplied equipment may degrade the instruments' EMC performance.
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