Hart Scientific 1521 Handheld Thermometer Readout User’s Guide Rev.
Limited Warranty & Limitation of Liability Each product from Fluke's Hart Scientific Division ("Hart") is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year for the Handheld Thermometer Readout. The warranty period begins on the date of the shipment. Parts, product repairs, and services are warranted for 90 days.
Table of Contents 1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 1.2 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 1.2.2 1.3 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Authorized Service Centers. . . . . . . . . . . . . . . . . . . . . .
6.6 INFO-CON Connector . . . . . . . . . . . . . . . . . . . . . . . 23 7 Display Functions. . . . . . . . . . . . . . . . . . . . . . . . . 25 7.1 Blank Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 7.2 7.3 Min/Max Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Hold Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 7.4 7.5 Delta(x) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Units . . . . . . . . . . . . . . . . . . . . . . . . .
11 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . 47 11.1 11.2 An Error Message Is Displayed . . . . . . . . . . . . . . . . . . . 47 CE Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 11.2.1 EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 11.2.1.1 11.2.1.2 11.2.2 Immunity Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Emission Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures and Tables Table 1 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 iv International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . 1 Front of the 1521 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Top and Side View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 INFO-CON Connector . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Before You Start Symbols Used 1 1.1 Before You Start Symbols Used Table 1 lists the International Electrical Symbols. Some or all of these symbols may be used on the instrument or in this manual.
1521 Handheld Thermometer Readout User’s Guide Symbol Description Canadian Standards Association OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 refers to the level of Impulse Withstand Voltage protection provided. Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from the fixed installation. Examples include household, office, and laboratory appliances.
1 Before You Start Safety Information Carefully place probes on a heat/cold resistant surface or rack until they reach room temperature. • The AC adapter can present safety concerns if misused or damaged. To avoid the risk of electric shock or fire, do not use the AC adapter outdoors or in a dusty, dirty, or wet environment. If the cord, case, or plug of the adapter is damaged in any way, discontinue its use immediately and have it replaced. Never disassemble the AC adapter.
1521 Handheld Thermometer Readout User’s Guide • Probes are fragile devices which can be damaged by mechanical shock, overheating, and absorption of moisture or fluids in the wires or hub. Damage may not be visibly apparent but nevertheless can cause drift, instability, and loss of accuracy. Observe the following precautions: • DO NOT allow probes to be dropped, struck, bent, or stressed. • DO NOT overheat probes beyond their recommended temperature range.
1 Before You Start Authorized Service Centers Chao Yang District Beijing 100004, PRC CHINA Phone: +86-10-6-512-3436 Telefax: +86-10-6-512-3437 E-mail: xingye.han@fluke.com.cn Fluke South East Asia Pte Ltd. Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace #03-16 The Comtech (Lobby D) 118502 SINGAPORE Phone: +65 6799-5588 Telefax: +65 6799-5588 E-mail: antng@singa.fluke.
2 Introduction 2 Introduction The 1521 Handheld Thermometer Readout is a low-cost, high-accuracy digital thermometer readout designed to be used with PRTs and thermistors. The unique combination of features makes this instrument suitable for a wide variety of applications in industry. Features and capabilities of the 1521 include the following: • Measures with platinum resistance thermometers (PRTs) and thermistors • Works with Hart’s special INFO-CON probe connector (which is partially based on U.S.
3 Specifications and Environmental Conditions Specifications 3 3.1 Specifications and Environmental Conditions Specifications Resistance Range 0Ω to 500 kΩ Resistance Accuracy, PRT, one year† 0Ω to 25Ω: 0.002Ω 25Ω to 400Ω: 0.008% (80 ppm) of reading Resistance Accuracy, thermistor, one year† 0Ωto 2 kΩ: 0.4Ω 2 kΩ to 200 kΩ: 0.02% (200 ppm) of reading 200 kΩ to 500 kΩ: 0.
1521 Handheld Thermometer Readout User’s Guide Digital Filter Exponential with adjustable time constant (1 to 60 seconds) Remote Communications RS-232 serial Display LCD, 6-digit x 7-segment with 16-character alphanumeric Operating Temperature Range 0 to 40°C (32 to 104°F) absolute 15 to 35°C (59 to 95°F) full accuracy Power 12 VDC (AC adapter included) Rechargeable NiMH batteries (included) Safety OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 refers to the level of Im
4 Quick Start Unpacking 4 Quick Start This section briefly explains the basics of setting up and operating your 1521 Thermometer. 4.1 Unpacking Carefully unpack the 1521 and accessories and inspect them to make sure all components are present and in satisfactory condition.
1521 Handheld Thermometer Readout User’s Guide top of the instrument with the ridged side down. It will fit snugly and lock into place when it is fully inserted. The INFO-CON probe connector includes a memory device that stores the unique characteristics of the probe, allowing the 1521 to measure temperature accurately. If your probe was purchased from Hart for use with the 1521 it should already have the connector attached and properly programmed.
5 Parts and Controls Front Features 5 Parts and Controls The functions of the various features of the 1521 are described below. 5.1 Front Features The front of the 1521 features the LCD display and control buttons.
1521 Handheld Thermometer Readout User’s Guide Display-The display shows the current temperature (or resistance) measurement on the large numeric upper portion of the display. It can also show a variety of information on the smaller alphanumeric lower portion such as minimum, maximum, hold temperatures, delta(x), and other instrument settings. Power and Backlight button-This button turns the instrument on or off.
5 Parts and Controls Top and Side Features 5.2 Top and Side Features Probe Connector Top View Side View Serial Port Infrared Window (not used) DC Power Input Stand Figure 2 Top and Side View The top and side of the 1521 feature the probe connector, DC power input, serial port, and infrared window. Probe Connector - At the top of the thermometer is the opening where the probe connector is inserted. The probe must be connected using an INFO-CON probe connector to measure temperature (see Section 6.
1521 Handheld Thermometer Readout User’s Guide 5.3 Back Features See Figure 4 on page 19. Stand-The stand at the back of the 1521 can be flipped down to prop up the instrument for better viewing. Battery Compartment- Behind the stand is the compartment that contains the battery pack. The battery pack can be accessed if necessary by opening the battery cover with a small Philips screwdriver (see Section 6.1).
5 Parts and Controls Accessories 5.5 Accessories The 1521's accessories and their features are described here. AC Adapter-The AC adapter recharges the internal battery pack and can also be used to supply power to operate the 1521 while the battery is being charged (see Section 6.2). Serial Cable-The serial cable can be used to connect a computer or a printer to the 1521 through its serial port (see Section 8).
1521 Handheld Thermometer Readout User’s Guide Ordering Information Cal Uncertainty and Repeatability Typical Drift (1 year) 1/4” x 12” or 15” (6.35 x 305 or 381 mm) ±0.015°C ±0.03°C –200 to 660°C 1/4” x 12” or 15” (6.35 x 305 or 381 mm) ±0.015°C ±0.03°C Pt-100 Ohm, 4-wire –200 to 450°C 1/4” x 12” (6.35 x 305 mm) ±0.025°C ±0.01°C Pt-100 Ohm, 4-wire –200 to 300°C 3/16” x 6” (4.76 x 152 mm) ±0.025°C ±0.
6 General Operation Battery 6 General Operation This section explains the details of the operation of the 1521 with its components and accessories. 6.1 Battery The 1521 has a built-in nickel-metal-hydride battery pack that can power the instrument for about 18 hours before needing to be recharged. The battery will discharge much more quickly if the display backlight is used often. The battery charge remaining or the message “External Power” is shown on the display when the instrument is switched on.
1521 Handheld Thermometer Readout User’s Guide on. The power control circuit inside the instrument manages battery charging and will stop charging the battery automatically when it’s fully charged. It normally takes about four hours to fully charge the battery. The instrument can be operated while the battery is being charged. CAUTION: DO NOT leave the AC adapter plugged in for more than 24 consecutive hours or, the battery life could be degraded.
6 General Operation Power Button adapter supplied with the instrument. The DC power source plugs into the DC power input on the right side of the 1521. – + Figure 5 12V DC Power Source Polarity WARNING: The AC adapter has circuits with high voltages inside that could present danger of electric shock or fire if exposed. If the AC adapter is damaged in any way or becomes hot, discontinue its use immediately, disconnect it from any AC supply, and have it replaced.
1521 Handheld Thermometer Readout User’s Guide smaller type to the right of the measurement. The possible units are degrees Celsius (C), resistance in ohms (Ω), degrees Fahrenheit (F), Kelvin (K), and degrees Rankine (R). The units can be easily changed by placing the display in the units setting mode using the MODE button (see Section 7.5). The lower part of the display has various functions depending on the selected mode. It has smaller alphanumeric characters.
6 General Operation INFO-CON Connector Temperature is generally sensed at the tip of the probe. To get an accurate temperature measurement the probe sheath should be well immersed, with adequate depth and fit, into the medium to be measured. CAUTION: Probes are fragile devices that can be easily damaged by mechanical shock, overheating, and absorption of moisture or fluids in the wires or hub. Damage may not be visibly apparent but nevertheless can cause drift, instability, and loss of accuracy.
1521 Handheld Thermometer Readout User’s Guide ognize that accuracy may be significantly degraded using a two-wire connection because of wire resistance.
7 Display Functions 7 Display Functions The 1521 operates in any of several modes which determine what information is visible in the lower alphanumeric portion of the display. The MODE button changes the mode. This button can be pressed repeatedly until a desired mode is set. The various modes are listed below in the order they appear. (See Figure 7).
1521 Handheld Thermometer Readout User’s Guide Each of these operating modes is described in the sections that follow. Blank Mode MODE button Delta(x) Mode Min/Max Mode MODE button MODE Set Units Hold Mode MODE button button MODE button Set Rate MODE button Set Resolution MODE button any mode MODE button (3 seconds) Cal Mode Figure 7 Operating Modes Flowchart 7.1 Blank Mode This mode is identified by “Blank” that temporarily appears on the display.
7 Display Functions Min/Max Mode In this mode nothing appears on the alphanumeric portion of the display. Use this mode if you are only interested in the latest measurements and want to simplify the appearance of the display. The message “Prb cal expired”, “Mtr cal expired”, “Recharge Needed”, or “Probe is locked” may be displayed. See Section 11.1. 7.2 Min/Max Mode This mode is identified by “Min/Max” that temporarily appears on the display.
1521 Handheld Thermometer Readout User’s Guide 7.5 Units This mode is identified by “Units: C/Ω/F/K/R” that appears on the display. This mode allows you to select the unit of measurement: C for degrees Celsius, Ω for resistance in ohms, F for degrees Fahrenheit, K for Kelvin, and R for Rankine. The Up and Down buttons are used to select one of the displayed units. The underline cursor indicates which of the units is selected. The ENT button stores the selection.
7 Display Functions CAL MODE 7.8 CAL MODE The calibration menu contains functions for setting probe and instrument calibration parameters. If a probe parameter is changed, the probe parameter is uploaded into the INFO-CON probe connector when the CAL MODE is exited or after scrolling through the entire menu. Always check to insure that the parameters have been written to the INFO-CON connector by disconnecting the probe or by turning the 1521 off and on.
1521 Handheld Thermometer Readout User’s Guide Beta [CVD only] - Set the beta probe coefficient b0 [Therm only] - Set the b0 probe coefficient b1 [Therm only] - Set the b1 probe coefficient b2 [Therm only] - Set the b2 probe coefficient b3 [Therm only] - Set the b3 probe coefficient Probe Wires - Set the number of wires of the probe PCal - Set the probe calibration date PDue - Set the probe calibration due date Filter - Set the digital filter time constant MCal - Set the instrument calibration date MDue -
7 Display Functions CAL MODE ensuring that it is not lost or forgotten. If necessary the passcode can be restored by contacting the manufacturer. To enter the passcode use the Up and Down buttons to set each digit of the passcode and the ENT button to move to the next digit on the right. Press ENT twice when all digits are entered to move to the next function. If the passcode is entered correctly the next function in the CAL Mode will appear. 7.8.
1521 Handheld Thermometer Readout User’s Guide ITS-90 PRTs calibrated to ITS-90 R(.
A PRT was calibrated to ITS-90 and its calibration certificate states values for coefficients R(273.16K), a4, b4, a8, and b8. Set the 1521 coefficients to the certificate values as follows. 1521 Coefficients Certificate Value R(.01) R(273.16K) a a8 b b8 c 0.0 d 0.0 a4 a4 b4 b4 Example 2: A PRT was calibrated to ITS-90 and its calibration certificate states values for coefficients R(273.16K), a5, and b5. Set the 1521 coefficients to the certificate values as follows. 7.8.
1521 Handheld Thermometer Readout User’s Guide higher), and has moderate accuracy (0.05°C to 1°C).
7 Display Functions CAL MODE Example 2: A thermistor has coefficients for the equation ln(R) as a function of T given as a, b, and c. Set the 1521 coefficients to the certificate values as follows: 7.8.14 1521 Coefficients Certificate Value b0 a b1 b b2 0.0 b3 c Probe Wires This function sets the number of connecting wires in the probe. The probe wires setting is stored in the INFO-CON connector. The 1521 can be used with probes that have two, three, or four wires.
1521 Handheld Thermometer Readout User’s Guide Note: Probe parameters are uploaded to the INFO-CON connector at this point. 7.8.17 Filter The digital filter helps to smooth variations in the measurements and improve resolution. A negative effect of filtering is that it tends to slow the response to changes in temperature. You can increase the filter time constant to further improve accuracy and resolution or decrease the time constant to reduce the response time. Valid values are any number between 0.
8 Communications Interface RS-232 Connection 8 Communications Interface Remote communications allows an external device, such as a computer, to communicate with the 1521 to obtain measurement data and control its operation. Communication is accomplished with various commands issued to the 1521 through the RS-232 serial port. 8.1 RS-232 Connection The three-conductor jack for the serial port is located on the top of the 1521 near the probe connector. One serial cable is included with the 1521.
ON (all carriage returns are followed by a linefeed (ASCII decimal 10)), and the duplex to HALF disabling echo. The serial port can be used to transmit measurements to a computer or printer. It can also be used to change settings of the 1521 from a computer or interface with software. A full list of commands follows in Section 8.2. Commands sent to the 1521 must end with an EOS character which is a carriage return (ASCII decimal 13) or linefeed character (ASCII decimal 10).
8 Communications Interface Communication Command List Description Command Example Set resolution digits re[solution]=n res=1 Read time ti[me] time Response Format Response Example Range 1 to 3 ti: hh:mm:ss ti: 16:23:45 Set time ti[me]=hh:mm:s ti=08:15:0 0 Note: You must set hours, min- s utes, and seconds for the time to be set correctly. 00:00:00 to 23:59:59 Read identification information *i[dn?] *idn? , , , 2.
1521 Handheld Thermometer Readout User’s Guide Description Command Example Set probe type p[robe]=IT[S-90]/ IE[C751]/ C[VD]/ Y[SI400]/ T[HR] pr Read ITS-90 R(.01) or CVD R0 r[0] r0 Set ITS-90 R(.01) or CVD R0 r[0]=n r0=100.106 Read ITS-90 coefficient a/b/c/d/a4/b4 a Set ITS-90 coefficient a/b/c/d/a4/b4=n a=-2.8644E-5 Read CVD coefficient al[pha]/de[lta]/be[ta] al Set CVD coefficient al[pha]/de[lta]/be[ta]=n al=0.
8 Communications Interface Communication Command List Description Command Example Response Format Response Example Range n Numeric data supplied by user 9 Numeric data returned to user x Character data returned to user 41
9 Calibration Required Equipment 9 Calibration The 1521 should be calibrated at regular intervals to ensure that it continues to measure with proper accuracy. Calibration should only be done by qualified, authorized personnel. 9.1 Required Equipment The following items are required to test and calibrate the 1521: • 0Ω four-wire resistor (short) • 25Ω four-wire resistor, uncertainty within 20 ppm (±0.0005Ω) • 100Ω four-wire resistor, uncertainty within 20 ppm (±0.
1521 Handheld Thermometer Readout User’s Guide 4. Verify the accuracy at 0Ω, 4kΩ, 10 kΩ, 40 kΩ, 100 kΩ, and 500 kΩ. 5. Set the meter calibration date to the present date (see Section 7.8.18). 6. Set the meter due date to one year from the present date (see Section 7.8.19).
10 Maintenance 10 Maintenance • This instrument has been designed with the utmost care. Ease of operation and simplicity of maintenance have been a central theme in the product development. Therefore, with proper care the instrument should require very little maintenance. Avoid operating the instrument in oily, wet, dirty, or dusty environments. • If the outside of the instrument becomes soiled, it may be wiped clean with a damp cloth and mild detergent.
11 Troubleshooting An Error Message Is Displayed 11 Troubleshooting In case you run into difficulty while operating the 1521, this section provides some suggestions that may help you solve the problem. Below are several situations that may arise followed by possible causes of the problem and suggested actions you might take. 11.1 An Error Message Is Displayed The following table lists possible error messages, their causes, and suggested actions.
1521 Handheld Thermometer Readout User’s Guide Problem Solution While attempting to measure resistance the display shows an incorrect value. Poor or incorrect connection of the probe. A common mistake is to connect the wires of the probe to the wrong terminals. Check the wiring carefully (see Figure 6). Open, shorted, or damaged sensor or lead wires. Check the resistance across the sensor using a handheld DMM. Also check the resistance between common pairs of leads.
11 Troubleshooting CE Comments The instrument was designed specifically as a test and measuring device. Compliance to the EMC directive is through IEC 61326-1 Electrical equipment for measurement, control and laboratory use – EMC requirements (1998). As noted in the IEC 61326-1, the instrument can have varying configurations. The instrument was tested in a typical configuration with shielded, grounded probe and RS-232 cables.
