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3
After switching on the power supply the output signal can be measured. Variations in the output signals may be due to two
possible causes:
1) The warm-up time of the sensor is about one hour. After this period the sensor signal should be stable for zero
differential pressure and constant ambient temperature.
2) For small pressure ranges a measurable zero-point shift due to ambient conditions can occur. This error can be
corrected for by adjusting the zero-point potentiometer of the sensor after the warm-up time is completed. (Set the output
signal of the sensor with both pressure inputs open to the nominal value).
Connection the pressure to be measured
The pressure to be measured should be connected to the „+“ input. APS sensors (absolute pressure) have only one pressure
connection. Do not blow into this pressure connection. This can damage or destroy measuring cells for pressures up to
100 hPa.
Transport and storage
Ambient storage temp. range: -10 °C to + 70 °C For transport make sure that both pressure inputs of differential pressure
sensors are open. Air transport of absolute pressure sensors should only be done in pressure compensated cabin.
Calibration instructions
Use the following tools for calibration of the pressure sensor:
Reference pressure
Precision manometer, digital manometer, DPC-pressure calibtraor; for APS use absolute pressure
reference
Pressure source
Pumps, bellows or DCP-pressure calibrator
Supply
Depending on the pressure measuring transducers
Measuring instruments
Multimeter to measure the output current or voltage signals
Calibration of type DPS
1.
Connect the correct power supply between terminals 1 and 2.
2. Connect the multimeter to measure the output signals (current or voltage) between terminals 3 and 4.
3. Wait for the sensor to warm-up (ca. 1 hour).
4.
To adjust the zero-point both pressure inputs must be open. Using the trimmer TP1 set the display of the multimeter to 0 Volt
(for current output 0 (4) mA).
5.
To adjust the full-scale deflection using a T-connector apply the rated pressure to the pressure connection of the sensor, the
pressure source and the pressure reference. Using the trimmer TP2 set the display of the multimeter to 10 Volt (for current
output 20 mA).
