ADOS GmbH GTR 210 Rev 1.16 Page 3
2.1. MED option
Gas transmitters with the MED option are made from seawater-resistant materials.
In the MED option, the gas transmitter GTR210 fulfils the requirements of the marine equipment
directive 2014/93/EU.
Its conformity has been demonstrated in an EC type examination by the body for ship safety (transport
employer's liability insurance association). With the MED option, the transmitter also conforms to the
following standards:
• IEC 60092-504: 2001 Electrical installations in ships - special
+ corrigendum 2011 features - control and
instrumentation
• IEC 60533: 1999 Electrical and electronic installations in
ships - electromagnetic compatibility
It thus fulfils the requirements of Item 3.54 of Annex A1 of the marine equipment directive.
The maritime field of application of the transmitter covers the detection of flammable and toxic gases
both below and above deck.
The use of the transmitter on the bridge or for measuring oxygen is not permitted.
3. Method of Operation
The gas transmitter consists of a two-part housing.
The lower part is used for the wall fixing and for connecting the control cable.
The measurement cell and the electronics of the gas transmitter are integrated into upper part of casing.
A capacitive keyboard and a graphics display are located behind a window incorporated in the upper
part.
For the detection of various gases, chemical measurement cells, sensors according to the process of
catalytic combustion, thermal conductivity, semi-conductors, infrared sensors and photo-ionization
detectors, are used.
The sensor signal is processed by the gas transmitter and converted into a physical display format. The
measured gas concentration is indicated at the same time on the display and transmitted to the
evaluation electronics unit outside of the explosion-hazard area via a 4-20 mA interface. This unit
processes the measured value, displays it as concentration and carries out possible control and warning
functions.
In the Comfort version of the GTR 210, alarm and fault relays are additionally installed on the lower
housing. Thus the Comfort version can be used as a real "standalone" gas measuring device, without
additional central unit.
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