ProMinent DULCOTEST DO 1-mA-20 ppm Instrucciones De Servicio página 42

Commissioning
Fig. 15: Changes in the measurement signal before, during and after calibration
Influences on the
measured variable
42
Hold the sensor up in the atmosphere to calibrate (see Fig. 15).
The sensor will emit a 4 mA signal throughout this phase and the
®
DULCOMETER D1C will display "0" ppm. In the calibration menu
of the DULCOMETER
up", the remaining calibration time is counted down.
After approx. 5 min. lower the sensor again. Calibration is now
complete. The sensor will start to measure again.
5 min
Calibrate the sensor every six months or more frequently if the
application requires it.
The integrated temperature sensor compensates temperature
influences on the measured variable.
To minimise the effect of the following parameters on the accuracy
of the measured values you can enter actual values in the
®
DULCOMETER D1C "Measurement parameters setting?" menu
during calibration and in the interim period (see operating instructions
manual for DULCOMETER
- Local atmospheric pressure at the measuring point related to the
height above sea level in mbar
- Height of measurement point above sea level in m
- Relative humidity of the atmosphere at the measuring point in %
- Air temperature at the measuring point in °C
- Water salt content in g/l
The "Factory settings" table in the Appendix gives the influence of
these parameters on the measured value where these deviate from
the set values.
The table also shows how to determine the parameters.
®
D1C (chap. 8) "Calibrating the O
® D1C, measured variable oxygen, part 2):
sensor
2
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