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5-75
CQO:1010PVXFM-3
Section 5
RTD Calibration By Data Entry
The [RTD Calibrate] menu allows you to adjust the intrinsic RTD reading to match an external reference
thermometer by directly entering its reading. Only perform this procedure while the RTD under test is
installed and currently measuring temperature.
To enter the current RTD temperature:
Move the highlight to from [RTD Calibrate] to [RTD 1] by pressing .
To access the [RTD 1] option list press .
Move the highlight to [User Cal] or [Factory] calibration then press . This triggers the prompt:
5.10.7 THE RTD CALIBRATE MENU
(optional)
The RTD Calibrate Menu appears on FUH1010DVX-3 models only.
Use this menu to calibrate the
991T or 1011TN Restive Temperature Device (RTD) temperature sensors to an external standard. It is
important to note that Siemens RTD temperature sensors are factory-calibrated for high accuracy. We
recommend that before deciding to perform the calibration, check the current RTD reading in [Diagnos-
tics/Liquid Data]. You may find that you do not even need to calibrate the sensor. In any case, make sure
that the temperature reading stabilizes before proceeding further. The RTD Calibrate menu allows you to
perform an external calibration, which can be accomplished either by data entry of the current RTD
temperature or by a 32
0
F (0
0
C) Ice-Bath procedure. You can switch between the intrinsic and external
calibration modes at any time.
NOTE: If you perform an external temperature calibration, you should mark and record the
location of each connector and sensor-cable. Once you have re-calibrated the tempera-
ture sensors, changing the sensor/connector orientation established during the proce-
dure may void the calibration.
To access the RTD Calibrate menu press
ENT
To enable numeric entry press , then enter the reading of the reference thermometer (e.g.,
72.0).
ENT
To recalibrate the RTD sensor press . To verify the calibrated reading, go to the [Diagnostics/
Liquid Data] menu cell to check the current RTD output. Make sure that it coincides with the
reading of the reference thermometer.
RTD Calibrate
RTD 1
Factory
User Cal
Calib @ deg F=32.0
Calib @ deg F=72.0
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