INFIELD CALIBRATION OF RTD TEMPERATURE SENSORS
Replacement RTD temperature sensors used in heat flow measurements must be calibrated in the field for proper operation.
Failure to calibrate the RTDs to the specific BTU inputs will result in inaccurate heat-flow measurements.
Equipment Required
• Ice Bath
• Boiling Water Bath
• Laboratory Grade Thermometer (accurate to 0.1 °C)
• Software Utility
0 °C
100 °C
Figure 62: Standards of known temperature
Replacing or Re-Calibrating RTDs
This procedure works with pairs of surface-mount RTDs or pairs of insertion RTDs supplied by the manufacturer of the
Energy model.
1. Connect the RTDs.
2. Establish communications with the transmitter using the UltraLink software utility.
3. Click Conguration and select the Output tab.
The screen should now look something like the following:
Download Cancel
File Open... File Save...
System Configuration
DisplayBasic Flow Filtering
Output
Security
4-20mA / Frequency
Channel 1:
0
Flow at 4mA / 0Hz: Gal/M
400
Flow at 20mA / 1KHz: Gal/M
Calibration/Test
Test
Calibration
4 mA
20 mA
32
3837
Test
4
RTD
Channel 2:
RTD #1:
A: B:
Calibrate
0.00000.0000
RTD #2:
A: B:
Calibrate
0.00000.0000
Figure 63: Output configuration screen
4. If RTD is not selected in the Channel 2 dropdown list, select it now.
5. Insert both RTD temperature sensors and the laboratory grade thermometer into either the ice bath or the boiling water
bath and allow about 20 minutes for the sensors to come up to the same temperature.
OTE:N An ice bath and boiling water bath are used in these examples because their temperatures are easy to maintain
and provide known temperature reference points. Other temperature references can be used as long as there is a
minimum delta T of 40° C between the two references.
OTE:N For maximum RTD temperature below 100° C, the hot water bath should be heated to the maximum temperature for
that RTD.
In-Field Calibration of RTD Temperature Sensors
Page 92 May 2016TTM-UM-00136-EN-06
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