50S & 50D Thermometer
Calibration Information
Required Test Equipment
Table 2 lists the required test equipment needed to perform the performance test and calibration procedures for the 50S and 50D thermometers. If the required equipment is not available, instruments with equivalent specifications may be used.
Test Equipment
DMM
Temperature Probe
DC Voltage Calibrator
Elastomeric Switch Pad
Thermocouple Connector
Thermocouple Connector
Thermocouple Wire (K or J Type)
Dewar Flask/Cap
Mercury Thermometer (either oC or oF)
Table 2. Required Test Equipment
Required Characteristics
DC Voltage Accuracy: 0.5%
Accuracy: Certified to ± 0.2 oC ambient
Output Voltage 0 to 10 V
Accuracy: 0.025%
Resolution: 10 μV
For
For
Standard
0.02 oC resolution
0.05 oF resolution
Recommended Model
Fluke 87 Series IV Digital Multimeter
Fluke Model
Fluke 5520A
Fluke Part Number 680686
Fluke
Fluke Part Number 779942
Fluke Part Number 833046
Omega
Thermos
Princo Model ASTM56C Princo Model ASTM56F
Performance Tests
Performance tests are recommended for incoming inspection, periodic maintenance, and for verifying the thermometer’s specifications. If the thermometer fails any part of the performance tests, calibration and/or repair is indicated.
Use the following procedure to prepare the thermometer before beginning the performance tests or calibration procedures.
1.Allow the thermometer to stabilize to room temperature, 23 oC ± 5 oC (73 oF ± 9 oF).
2.Check the battery and replace it if necessary.
Display Test
Turn the thermometer on while pressing the HOLD button. All display segments are shown until the HOLD button is released. Check that all the display segments are showing as in Figure 3.
Note
Because pressing the HOLD button during
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