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Z11.0.0X.6C-05
Measuring Oxigen 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 temperture should be the same.
Temperature differences may cause additional measuring errors! In worst case condtions it may take up to several
hours until both temperatures are adjusted. A suitable flow of the gas around the sensor element increases the
adjustment significantly.
Application of the different sensor types GGO 369 und GOO 369
GGO 369 (closed sensor)
For measurements at atmosphere and in systems without over or under pressure the GGO 369 is sufficient.
Additionally 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 measurment 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 in the range of 0.5 ...2 bar. The pressure will be compensated by the
GMH3691 and no additional mesuring error will occur.
GOO 369 (open sensor)
The sensor is equipped with drillings at the end and because of its special construction the masuring gas streams
optimally around the sensor. No pressure can appear while gas blows to the sensor, which otherwise would result
in erroneous measurings.
The temperature compensation speed of the sensor also is optimized 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
leaving the bottle lowers the temperature, is optimized 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.
Safety requirements:
This device has been designed and tested in accordance with the safety regulations for electronic devices.
However, its trouble-free operation and reliability cannot be guaranteed unless the standard safety measures and
special safety advises given in this manual will be adhered to when using the device.
1. Trouble-free operation and reliability of the device can only be guaranteed if the device is not subjected to any
other climatic conditions than those stated under "Specification".
2. If the device is transported from a cold to a warm environment condensation may result in a failure of the
device. In such a case make sure the device temperature has adjusted to the ambient temperature before
trying a new start-up.
3. If device is to be connected to other devices ( e.g. via serial interface) the circuitry has to be designed most
carefully. Internal connection in third party devices (e.g. connection GND and earth) may result in not-
permissible voltages impairing or destroying the device or another device connected.
4. If there is a risk whatsoever involved in running it, the unit has to be switched off immediately and to be marked
accordingly to avoid re-starting.
Operator safety may be at risk if:
- there is visible damage to the device.
- the device is not working as specified.
- the device has been stored under unsuitable conditions for a longer time.
In case of doubt, please return device to manufacturer for repair or maintenance.
5. Warning: do not use these product as safety or emergency stop devices, or in any other application where
failure of the product could result in personal injury.
Failure to comply with these instructions could result in death or serios injury.
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