S56.0.01.6C-04 page 5 of 7
6 General handling instructions
6.1 To connect/change sensors
Only sensors of the GMSD or GMXD-serial are allowed to be used! If other sensors are used the adapter
and the sensor may be destroyed.
To change the sensor you have to disconnect the adapter. Sensors have to be connected before acti-
vating the adapter. Otherwise they are not found by the adapter correctly.
During the connecting it is possible that the connector does not snap in the jack correctly. In this case you
have to hold the connector at the anti-kink device not at the casing. Don`t plug the connector wedged. An
accurate attached jack can be easily plugged in without great effort. To disconnect the sensors it is not
allowed to pull at the cable. In this case you have to hold the connector at its casing.
6.2 Altitude correction of the absolute pressure sensor
The device measures the absolute pressure of the ambient air. But this pressure is not to be confused
with the “pressure at sea level”, which is quoted by meteorological stations!
At this indication the decrease of the air pressure which is dependent on the level will be calculated. The
device has the ability to do this air pressure height adjustment.
Activate for this the “sea level function” via the configuration software (GSOFT_USB) and specify the
height beyond the sea level of your habitation.
6.3 Zero correction of the pressure sensor ('OFFS')
For the measurement a zero offset can be conducted:
shown vale = measured value - offset
The zero correction in combination with the slope correction (see below) are mainly used to adjust the
deviation of sensors. The entry has to be made in the configuration software. The offset information will
be stored in the sensor. So you can set it individually for each sensor.
6.4 Slope correction of the pressure sensor ('SCAL')
The measurement`s slope can be affected by this factor (factor in %):
shown value = measured value * (1 + scale / 100)
The slope correction in combination with the zero correction (see above) are mainly used to adjust the
deviation of sensors. The entry has to be made in the configuration software. The scale information will be
stored in the sensor. So you can set it individually for each sensor.
6.5 Pressure connection to the pressure sensor
The measuring adapter is conceived that way that all sensors of the GMSD/GMXD...-series can be con-
nected without new calibration. Therefore a multiplicity of fully exchangeable sensors for metering ranges
of 1.999...2.500mbar relative to 0...400.0 bar absolute for example are available.
Relative pressure sensors (type: GMSD/GMXD...MR, GMSD/GMXD...BR)
•For overpressure and respectively low-pressure measurements: fix the flexible hose with 4mm inner
diameter at the fitting "B”.
•For pressure difference measurements: fix both flexible hoses with 4mm inner diameter at the fittings
"A” and “B”, whereas the higher pressure has to be connected to the attachment “B”.
Absolute pressure sensors (type: GMSD/GMXD...BA)
Fix the flexible hose with 4mm inner diameter to the fitting “A” (“B” is without any function).
Stainless steel sensors (type: GMSD/GMXD...MRE, GMSD/GMXD...BRE, GMSD/GMXD...BAE)
For overpressure, low-pressure or absolute pressure measurements: screw the sensor in the winding
(G1/4”) or connect a flexible hose with an appropriate adapter to the pressure sensor.
6.6 Advice for calibration service
Factory calibration certificate – DKD-certificate – ministerial certifications:
If the measuring device shall have a calibration certificate you have to send it inclusive the sensor to the
manufacturer. Just the manufacturer can check the factory settings and correct them if necessary
