® 724 Temperature Calibrator Users Manual February 2000 Rev.1, 8/03 © 2000-2003 Fluke Corporation. All rights reserved. All product names are trademarks of their respective companies.
LIMITED WARRANTY & LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is three years and begins on the date of shipment. Parts, product repairs and services are warranted for 90 days.
Table of Contents Title Introduction.................................................................................................................... Contacting Fluke............................................................................................................ Standard Equipment ...................................................................................................... Safety Information.............................................................................................
724 Users Manual Using Resistance-Temperature Detectors (RTDs) ............................................... Using Source Mode........................................................................................................ Sourcing Electrical Parameters ................................................................................. Simulating Thermocouples ........................................................................................ Simulating RTDs.....................................
Temperature Calibrator Contents (continued) General Specifications .............................................................................................. 43 Index .......................................................................................................................................
724 Users Manual iv
List of Tables Table Title Page 1. 2. 3. 4. 5. 6. 7. Summary of Source and Measure Functions........................................................................ International Symbols ........................................................................................................... Input/Output Terminals and Connectors ............................................................................... Key Functions ................................................................................
724 Users Manual vi
List of Figures Figure Title Page 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. Standard Equipment ............................................................................................................. Input/Output Terminals and Connectors ............................................................................... Keys......................................................................................................................................
724 Users Manual viii
Temperature Calibrator Introduction Contacting Fluke Your Fluke 724 Temperature Calibrator is a handheld, battery-operated instrument that measures and sources a variety of thermocouples and RTDs. See Table 1. To order accessories, receive operating assistance, or get the location of the nearest Fluke distributor or Service Center, call: In addition to the functions in Table 1, the calibrator has the following features and functions: • • • • A split-screen display.
724 Users Manual Table 1.
Temperature Calibrator Standard Equipment Standard Equipment Safety Information The items listed below and shown in Figure 1 are included with your calibrator. If the calibrator is damaged or something is missing, contact the place of purchase immediately. To order replacement parts or spares, see the user-replaceable parts list in Table 7. The calibrator is designed in accordance with IEC1010-1, ANSI/ISA S82.01-1994 and CAN/CSA C22.2 No. 1010.192.
724 Users Manual W Warning To avoid possible electric shock or personal injury: • Do not apply more than the rated voltage, as marked on the calibrator, between the terminals, or between any terminal and earth ground. Maximum for all terminals is 30 V, 24 mA. • Before each use, verify the calibrator’s operation by measuring a known voltage. • Follow all equipment safety procedures. • Never touch the probe to a voltage source when the test leads are plugged into the current terminals.
Temperature Calibrator Safety Information W Warning • Use only 4 AA batteries, properly installed in the calibrator case, to power the calibrator. • Disconnect test leads before changing to another measure or source function. • When servicing the calibrator, use only specified replacement parts. • To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as the battery indicator (M) appears.
724 Users Manual Alligator Clips STORE SETUP 100% RECALL 25% 25% 0% 30V MAX ALL SOURCE / MEAS URE TL75 Test Lead Set 3W V RTD TERMINALS MEASURE TC V mA LOOP mA4W COM COM Stackable Test Leads zi01f.eps Figure 1.
Temperature Calibrator Safety Information Table 2. International Symbols AC - Alternating current Double insulated DC - Direct current Battery Earth ground Refer to the manual for information about this feature.
724 Users Manual Getting Acquainted with the Calibrator Input and Output Terminals 724 TEMPERATURE CALIBRATOR Figure 2 shows the calibrator input and output terminals. Table 3 explains their use. mA V MEAS SOURCE LOOP ˚C V TC RTD STORE SETUP ˚F 100% 25% RECALL 25% 0% 1 7 2 6 5 4 3 zi02f.eps Figure 2.
Temperature Calibrator Getting Acquainted with the Calibrator Table 3. Input/Output Terminals and Connectors No Name Description A, B MEASURE V, mA terminals Input terminals for measuring voltage, current, and supplying loop power. C TC input/output Terminal for measuring or simulating thermocouples. This terminal accepts a miniature polarized thermocouple plug with flat, in-line blades spaced 7.9 mm (0.312 in) center to center.
724 Users Manual Keys Figure 3 shows the calibrator keys and Table 4 explains their use.
Temperature Calibrator Getting Acquainted with the Calibrator Table 4. Key Functions No Name Description A O B V Selects voltage measurement function in the upper display. C A Selects the mA measurement function in the upper display. D K Activates a 24-volt loop supply while measuring mA. E C F F Displays temperature in degrees Celsius when in TC or RTD functions. G D Displays temperature in degrees Fahrenheit when in TC or RTD functions. H G I H Increments output by 25 % of span.
724 Users Manual Table 4. Key Functions (cont.) No Name Description L L AM OY AM OZ Enables Shut Down Mode M XW YZ Increases or decreases the source level. Cycles through the 2-, 3-, and 4-wire selections. Moves through the eight memory locations of calibrator setups. In Contrast Adjustment mode; up-darkens contrast, down-lightens contrast. N Q Retrieves a previous calibrator setup from one of eight memory locations. O S Saves the calibrator setup to one of eight memory locations.
Temperature Calibrator Getting Acquainted with the Calibrator Display Figure 4 shows the elements of a typical display. Loop Annunciator Memory Locations for Calibrator Setups Low Battery Symbol Units Display Mode Indicator Auto Ramp sh07f.eps Figure 4.
724 Users Manual Getting Started 6. This section acquaints you with some basic operations of the calibrator. Press X to increase the output to 5 V. Press and hold G to enter 5 V as the 100 % value. 7. Press H and I to step between 0 and 100 % in 25 % step increments. Proceed as follows to perform a voltage-to-voltage test: 1. 2. 3. Connect the calibrator’s voltage output to its voltage input as shown in Figure 5. Press O to turn on the calibrator. Press l to select dc voltage (upper display).
Temperature Calibrator Shut Down Mode 724 TEMPERAT URE CALIB RATO R V MEAS mA LOOP V ˚C SOURCE TC RTD ˚F STORE SETUP 100% RECALL 25% 25% 0% zi04f.eps Figure 5.
724 Users Manual Contrast Adjustment Note Available with V2.1 Firmware or greater. To identify firmware version, press and hold J when powering up. The firmware version will be shown in the upper units display for about 1 second after initialization. 724 TEMPERATURE CALIBRATOR 1 To adjust the contrast, proceed as follows: mA V 1. 2 Press C and O until Contst Adjust is displayed as shown in Figure 6. 2. Press and hold X to darken contrast. 3. Press and hold W to lighten contrast. 4.
Temperature Calibrator Using Measure Mode Using Measure Mode Measuring Electrical Parameters (Upper Display) To measure the current or voltage output of a transmitter, use the upper display and proceed as follows: 1. 2. 724 TEMPERATURE CALIBRATOR Press A to select current. LOOP should not be on. Connect the leads as shown in Figure 7.
724 Users Manual 724 TEMPERATURE CALIBRATOR Red mA V MEAS SOURCE LOOP ˚C V TC RTD ˚F TEST DC PWR STORE SETUP 100% RECALL 25% – ++ – 25% 0% + – Black zi06f.eps Figure 8.
Temperature Calibrator Using Measure Mode Measuring Electrical Parameters (Lower Display) To measure the electrical parameters using the lower display, proceed as follows: 1. Connect the calibrator as shown in Figure 9. 2. If necessary, press M for MEASURE mode (lower display) 3. Press l for dc voltage or current, or U for resistance. 724 mA V MEAS SOURCE STORE SETUP RECALL TEMPERATURE CALIBRATOR LOOP ˚C V TC RTD ˚F 100% 25% 25% 0% zi07f.eps Figure 9.
724 Users Manual Note Measuring Temperature One pin is wider than the other. Do not try to force a miniplug in the wrong polarization. Using Thermocouples The calibrator supports ten standard thermocouples, including types E, N, J, K, T, B, R, S, L, or U. Table 5 summarizes the ranges and characteristics of the supported thermocouples. To measure temperature using a thermocouple, proceed as follows: 1.
Temperature Calibrator Using Measure Mode Table 5.
724 Users Manual 30V MAX ALL TERMINALS SOURCE / MEASURE MEASURE V 3W TC V mA Process Temperature RTD LOOP TC 4W COM Warning 30 V maximum to COM TC Miniplug zi14f.eps Figure 10.
Temperature Calibrator Using Measure Mode Using Resistance-Temperature Detectors (RTDs) The calibrator accepts RTD types shown in Table 6. RTDs are characterized by their resistance at 0 °C (32 °F), which is called the “ice point” or R0. The most common R0 is 100 Ω. The calibrator accepts RTD measurement inputs in two-, three-, or four-wire connections, with the three-wire connection the most common.
724 Users Manual Table 6. RTD Types Accepted RTD Type Ice Point (R ) 0 Material α Range (°C) Pt100 (3926) 100 Ω Platinum 0.003926 Ω/°C -200 to 630 Pt100 (385) 100 Ω Platinum 0.00385 Ω/°C -200 to 800 Ni120 (672) 120 Ω Nickel 0.00672 Ω/°C -80 to 260 Pt200 (385) 200 Ω Platinum 0.00385 Ω/°C -200 to 630 Pt500 (385) 500 Ω Platinum 0.00385 Ω/°C -200 to 630 Pt1000 (385) 1000 Ω Platinum 0.00385 Ω/°C -200 to 630 Pt100 (3916) 100 Ω Platinum 0.
Temperature Calibrator Using Measure Mode 30V MAX ALL TERMINALS SOURCE / MEASURE MEASURE V 3W TC RTD 2W 4W RTD V mA Resistance to be measured LOOP COM COM 30V MAX ALL TERMINALS SOURCE / MEASURE MEASURE V 3W TC RTD 3W 4W V mA RTD LOOP COM COM Resistance to be measured 30V MAX ALL TERMINALS SOURCE / MEASURE 3W 4W MEASURE V RTD 4W COM TC V mA RTD LOOP COM Resistance to be measured zi08f.eps Figure 11.
724 Users Manual To select an electrical sourcing function, proceed as follows: Using Source Mode In SOURCE mode, the calibrator generates calibrated signals for testing and calibrating process instruments, supplies voltages and resistances, and simulates the electrical output of RTD and thermocouple temperature sensors. 1. 2. If necessary, press Mfor SOURCE mode. 3. Press V for dc voltage, or U for resistance. 4. Enter the desired output value by pressing X and W keys.
Temperature Calibrator Using Source Mode Simulating Thermocouples Simulating RTDs Connect the calibrator TC input/output to the instrument under test with thermocouple wire and the appropriate thermocouple mini-connector (polarized thermocouple plug with flat, in-line blades spaced 7.9 mm [0.312 in] center to center). Connect the calibrator to the instrument under test as shown in Figure 14. Proceed as follows to simulate an RTD: Note 1. If necessary, press M for SOURCE mode. 2.
724 Users Manual 724 TEMPERATURE CALIBRATOR TEST DC PWR Color depends on type of TC mA V – ++ LOOP + MEAS SOURCE TC – ˚C V RTD STORE SETUP ˚F 100% 25% RECALL 25% 0% TC TC Miniplug zi10f.eps Figure 13.
Temperature Calibrator Using Source Mode SENSOR TERMINALS 1 724 TEMPERAT URE CALIB RATO R 4 3 V MEAS mA 2 LOOP V ˚C SOURCE TC RTD ˚F STORE SETUP 100% RECALL 25% BLACK 25% 0% RED BLACK zi11f.eps Figure 14.
724 Users Manual Setting 0 % and 100 % Output Parameters For output parameters (volts, ohms, TC potentials or RTD resistances), you must set the 0 % and 100 % points before you can use the step and ramp functions. Proceed as follows: 1. 2. If necessary, press M for SOURCE mode. Select the TC source function and use the arrow keys to enter the value. Our example is thermocouple source using 100 °C and 300 °C values for source. 3. Enter 100 °C and press and hold J to store the value. 4.
Temperature Calibrator Storing and Recalling Setups Auto Ramping the Output Auto ramping gives you the ability to continuously apply a varying stimulus from the calibrator to a transmitter, while your hands remain free to test the response of the transmitter.
724 Users Manual Calibrating a Transmitter 4. Set your zero and span parameters by pressing X and W keys. Enter these parameters by pressing and holding J and G. For more information on setting parameters, see “Setting 0 % and 100 %” earlier in this manual. 5. Perform test checks at 0-25-50-75-100 % points by pressing H or I. Adjust the transmitter as necessary. Use the measurement (upper display) and source (lower display) modes to calibrate a transmitter.
Temperature Calibrator Calibrating a Transmitter 724 TEMPERATURE CALIBRATOR Red mA V MEAS SOURCE LOOP ˚C V TC RTD ˚F TEST DC PWR STORE SETUP 100% RECALL 25% – ++ – 25% 0% + – Black zi12f.eps Figure 15.
724 Users Manual Testing an Output Device Use the source functions to test and calibrate actuators, recording, and indicating devices. Proceed as follows: 1. Connect the test leads to the instrument under test as shown in Figure 16. 2. Press l for dc voltage, or U for resistance (lower display). 3. If necessary, press M for SOURCE mode. 724 mA V MEAS SOURCE Red STORE SETUP RECALL TEMPERATURE CALIBRATOR LOOP ˚C V TC RTD ˚F 100% 25% 25% 0 to 1 V dc Input 0% Black zi13f.eps Figure 16.
Temperature Calibrator Replacing the Batteries 1. Turn the calibrator off, remove the test leads from the terminals, and hold the calibrator face down. 2. Using a flat-blade screwdriver, turn the battery door screws 1/4-turn counterclockwise and remove the battery door. Figure 17 shows you how to replace the batteries. 3. Remove and replace the damaged fuse. Replacing the Fuse 4. Replace the battery door and secure it by turning the screws 1/4-turn clockwise.
724 Users Manual Maintenance Cleaning the Calibrator W Warning To avoid personal injury or damage to the calibrator, use only the specified replacement parts and do not allow water into the case. Caution To avoid damaging the plastic lens and case, do not use solvents or abrasive cleansers. Clean the calibrator with a soft cloth dampened with water or water and mild soap. Battery and Compartment Service Center Calibration or Repair Fuse Compartment sh38f.eps Figure 17.
Temperature Calibrator Maintenance postage paid and insured, to the nearest Service Center. Fluke assumes no responsibility for damage in transit. 6 Mounting screws 494641 11 7 Backlight 690336 1 The Fluke 724 Temperature Calibrator covered by the warranty will be promptly repaired or replaced (at Fluke’s option) and returned to you at no charge. See the warranty at the beginning of this manual for warranty terms.
724 Users Manual 17 1 22 10 11 12 2 8 9 3 13 7 20 4 6 14 3 5 16 18 15 19 6 21 23 zi46f.eps Figure 18.
Temperature Calibrator Specifications DC Voltage Source Specifications Specifications are based on a one year calibration cycle and apply from +18 °C to +28 °C unless stated otherwise. All specifications assume a 5 minute warmup period. DC Voltage Measurement Range Resolution 30 V (upper display) 0.001 V 20 V (lower display) 0.001 V 90 mV 0.01 mV Accuracy, (% of Reading + Counts) 0.02 % + 2 Accuracy, (% of Reading + Counts) Range Resolution 100 mV 0.01 mV 0.02 % + 2 10 V 0.001 V 0.
724 Users Manual Ohms Source Ohms Measurement Accuracy ± Ω Ohms Range 4-Wire 2- and 3-Wire* 0 to 400 Ω 0.1 0.15 400 to 1.5 kΩ 0.5 1.0 1.5 to 3.2 kΩ 1 1.5 Excitation Current: 0.2 mA Maximum input voltage: 30 V Temperature coefficient -10 °C to 18 °C, +28 °C to 55 °C: ± 0.005 % of range per °C * 2-wire: Does not include lead resistance. 3-wire: Assumes matched leads with a total resistance not exceeding 100 Ω. 40 Excitation Current from Measurement Device Accuracy ±Ω 15 to 400 Ω 0.15 to 0.
Temperature Calibrator Specifications Millivolt Measurement and Source* Range Resolution -10 mV to 75 mV R Accuracy ±(0.025 % + 1 count) 0.01 mV S Maximum input voltage: 30 V Temperature coefficient -10 °C to 18 °C, +28 °C to 55 °C: ±0.005 % of range per °C *Select this function by pressing T. The signal is available at the thermocouple miniplug connector. Temperature, Thermocouples Type J K T E Range B L Measure and Source Accuracies (ITS-90) -200 to 0 °C 1.0 °C 0 to 1200 °C 0.
724 Users Manual Temperature, RTD Ranges, and Accuracies (ITS-90) Accuracy Type Range °C Measure 4-Wire °C Measure 2- and 3-Wire* °C Source °C Ni120 -80 to 260 0.2 0.3 0.2 Pt100-385 - 200 to 800 0.33 0.5 0.33 Pt100-392 -200 to 630 0.3 0.5 0.3 Pt100-JIS -200 to 630 0.3 0.5 0.3 Pt200-385 -200 to 250 250 to 630 0.2 0.8 0.3 1.6 0.2 0.8 Pt500-385 -200 to 500 500 to 630 0.3 0.4 0.6 0.9 0.3 0.4 Pt1000-385 -200 to 100 100 to 630 0.2 0.2 0.4 0.5 0.2 0.2 Resolution: 0.1 °C, 0.
Temperature Calibrator Specifications Loop Power Supply Voltage: 24 V Maximum current: 22 mA Short circuit protected General Specifications Operating temperature -10 °C to 55 °C Storage temperature - 20 °C to 71 °C Operating altitude 3000 meters above mean sea level Relative Humidity (% RH operating without condensation) 90 % (10 to 30 °C) 75 % (30 to 40 °C) 45 % (40 to 50 °C) 35 % (50 to 55 °C) uncontrolled < 10 °C Vibration Random, 2 g, 5 to 500 Hz Safety EN 61010-1:1993, ANSI/ISA S82.
724 Users Manual 44
Index —0— —C— —I— 0% output parameter, setting, 30 Calibration, 36 Cleaning calibrator, 36 Input terminals, 8 Input/output terminals and connectors (table), 9 —1— 100% output parameter, setting, 30 —D— Display, 13 —A— Auto ramping output, 31 —B— —E— Electrical parameters measurement, 19 sourcing, 26 Batteries, replacing, 35 —G— Getting started, 14 —K— Key functions (table), 11 Keys, 10 —M— Measure functions, summary (table), 2 Measure mode, 17 Measuring temperature with RTDs, 23 temperature w
724 Users Manual —O— —S— Storing setups, 31 Output device, testing, 34 Output terminals, 8 Safety information, 3 Servicing, 36 Setup recalling, 31 storing, 31 Thermocouple, 27 Simulating RTD, 27 thermocouples, 27 Source functions, summary (table), 2 Sourcing electrical parameters, 26 thermocouples, 27 Specifications, 39 Standard equipment, 3 Stepping output, 30 —T— —P— Parts list, 37 —R— Recalling setups, 31 Repair, 36 RTD simulating, 27 RTD measuring, 23 types, 23 46 Temperature measuring with RT