Calibration And Compensation; Calibration Of The Temperature Sensor; Calibration Of The Pressure - Pentair HAFFMANS c-DGM Instruction Manual

7.

Calibration and compensation

7.1

Calibration of the temperature sensor

The temperature sensor is an accurate PT-100 that is associated with tight tolerances and
therefore does not require calibration.
A check can be performed by initiating a flow of liquid through the measurement chamber and
comparing the temperature displayed on the DGM with a reading from a precision thermometer
placed in the outlet of the DGM.
7.2

Calibration of the pressure

The pressure in the CO
absolute pressure. This results in automatic compensation for changes in atmospheric pressure
caused by variable weather conditions or altitude differences.
We suggest that the pressure sensor be checked/calibrated once per month. Select the
"Configuration" menu and the "Calibration" submenu to perform the calibration.
Procedure:
1. Remove the liquid from the measurement chamber.
2. Make sure the handle is depressed (measurement position).
3. Remove the screw (pos. 03) from the measurement chamber and replace it with the
calibration screw from the service set.
Warning
4. Connect the DGM to a calibration device (for example the Haffmans Gauge Calibration
Device) and a source of pressurized calibration gas (for example air or CO
Warning
5. Now follow the instructions on the following 2 pages:
c-DGM/i-DGM
formula is an absolute pressure. The pressure sensor measures
2
Tighten the calibration screw carefully so it does not damage
the threads in the plexiglass.
To prevent damage to the screw threads in the plexiglass, do
not subject the calibration screw to any force from the side.
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).
2
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