User manual

Z11.0.0X.6C-13 page 3 of 4
Application of the different sensor types GGO ... and GOO ...
GGO 370, GGO 380 (closed sensor)
For measurements at atmosphere and in systems without over or under pressure the GGO 369 is sufficient. Addi-
tionally the GGO can be screwed impermeable to systems with low over or under pressure.
Attention! If the sensor cannot be calibrated at exactly the same pressure, the measurement will be faulty! For
such applications we suggest the use of a GMH3691 with the manual pressure compensation. Then the GGO can
be connected to systems with a known pressure. (Attention: please note the specified operating pressure for one-
sided strain). The pressure will be compensated by the GMH3691 and no additional measuring error will occur.
GOO 369, GOO 370, GOO 380 (open sensor)
The sensor is equipped with drillings at the end and because of its special construction the measuring gas streams
optimally around the sensor. No pressure can appear while gas blows to the sensor, which otherwise would result
in erroneous measures.
The temperature compensation speed of the sensor also is optimised by this design. The measuring gas escapes
into the air. Especially the measuring of gases from compressed gas bottles, where the expansion of the gas leav-
ing the bottle lowers the temperature, is optimised with regard to the temperature compensation and pressure
errors. The gas flow should be chosen in a suitable range, where no overpressure can happen, esp. if the sensor
is connected directly to the source e.g. by means of a tube.
Measuring Oxygen with the GMH3690 and GMH3691
Calibration and measuring are depending of the absolute pressure at the sensor.
Therefore check the absolute pressure before calibration and measuring. When using a GMH3691 (with manual
pressure compensation)the pressure can be entered, when using a GMH3690 the pressure during calibration
should be the same as during the measuring (otherwise e.g. 1% deviation results in 1% measuring error).
Sensor temperature and gas temperature should be the same.
Temperature differences may cause additional measuring errors! In worst case conditions it may take up to sev-
eral hours until both temperatures are adjusted. A suitable flow of the gas around the sensor element increases
the adjustment significantly.
How to operate:
a.) Treat device and sensor carefully. Use only in accordance with above specification. (do not throw, hit against
etc.).
Protect plug and socket from soiling.
b.) The sensors are only suitable for the devices of the GMH369x series. Unsuitable devices may lead to the de-
struction of the measuring device and the measuring sensors.
c) When connecting the sensor the connector may not lock to the jack correctly. In such a case hold the connector
not at the case but at the buckling protection of the cable during the plug in.
Don't connect sensor canted! If plug is entered correctly, it will slide in smoothly.
To disconnect sensor do not pull at the cable but at the plug
d) Keep the allowable pressure range of the sensor in mind, to high or to low pressure may destroy the sensor.