Dynasonics TFX Ultra Transit Time Flow Meters - Manual (Page 82)

IN FIELD CALIBRATION OF RTD TEMPERATURE SENSORS
Replacement RTD temperature sensors used in heat flow measurements must be calibrated in the field to ensure 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
MINCO MINCO
100 °C
Figure 59: Standards of know 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 meter.
1. Connect the RTDs.
2. Establish communications with the flow meter using the software utility.
3. Press the Configuration tab in the menu bar and then select the Output tab.
The screen should now look something like the following:
Do w n l o a d Ca n c el F i l e Op en . . . F i l e Sa v e. . .
S y s t e m C o n f i g u r a t i o n
Display Basic Flow Filtering Output Security
4-20m A / F r eq u en c y Channel 1:
0 Flow at 4mA / 0Hz: Gal/M
400 Flow at 20mA / 1KHz: Gal/M
Calibration/Test
Test
Calibration
4 m A
20 m A
32
3837
Test 4
R TD Channel 2:
RTD #1:
A: B: Ca l i b r a te 0. 0000 0. 0000
RTD #2:
A: B: Ca l i b r a te 0. 0000 0. 0000
Figure 60: Output configuration screen
4. If RTD is not selected in the Channel 2 drop-down 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.
IN FIELD CALIBRATION OF RTD TEMPERATURE SENSORS
Page 82 March 2014