3
Important application notes
3.1
Avoiding damage to the measuring probe
Instruments are sensitive and must be treated carefully: Avoid impact, shocks and
vibration.
The sinter filter protects the sensor against mechanical effects and contamination. Do
not remove the filter. Use the measuring probe only with sinter filter in intact
condition!
Before installation, ensure that the measuring point has no condensed water, oil or
dirt secretion! If this is the case, then first put the system in order and dry up!
The measuring system is not suitable for strong oil laden compressed air, since an oil
film on the sensor directly restricts the response behaviour, chokes the pores of the
filter and damages the diverting throttle.
General principle: If you have doubts, you should contact the manufacturer before
you risk errors and cause damage by experimenting on the object!
3.2
Calibration and measuring accuracy
Before delivery, the pressure dew point probes are adjusted and checked at multiple
temperature and humidity points through a sophisticated calibration process. An
adjustment by the end user is not possible.
Please observe the permissible application temperature range. The measuring
accuracy becomes worse at higher temperatures. Exceeding the temperature limit
damages the measuring probe.
The specified data, specially the achievable measuring accuracy, is applicable at 20
°C. General principle: lower is the temperature at the probe, more exact is the result of
measurement. If possible, the measurement should be taken at a cold point or the gas
can be cooled down to ambient temperature.
The reference cells, available as accessories, are ideally suitable to check the
measuring accuracy up to approx. -10 °C tpd. The application guidelines must be duly
followed and before application, the cells are to be checked as per the application
manual! To be always used with unscrewed sinter cap! Further information can be
obtained on request.
With proper application, the measuring probe can be used over many years.
Nevertheless, in order to rule out any error, we recommend 12 months calibration
periodicity, particularly during application of the measuring probe in critical
applications in the lower dew point measuring range.
3.3
Intended application
The pressure dew point probe is intended for measurement of pressure dew point in
clean, dry and oil free compressed air. The range of application is right from -40... +60
°C, with which the calibrated application range is reduced to -10 ... +45 °C. The
accuracy specified in the technical data sheet is at 20 °C. The permissible operating
pressure of the standard version is 0... 17 bar (0... 1.7 MPa).
