REV 0, June 2005Page 134
Operation Manual SUPREMA
5. Installation
5.6 Connection of the Sensors
5.6.1 General Instructions
Warning: Always turn off the voltage to the system before connecting the
sensors.
• Incorrect connection of the sensors can cause damage both to the SUPREMA and to the
sensor itself.
• It must be ensured that the adapter modules corresponding to the sensors are plugged
into the appropriate MAI module (verify that the sequence is correct
(see section 5.3.2
Configuration of the MAI Module).
• After the sensors have been connected, they are to be separated electrically again by
pulling the connector plug on the MAT or MAT-TS module. They are to be plugged in
again individually only as part of the startup procedure
(see section 6 Startup ). If the
MGT-40-TS module is being used, this is to be disconnected by pulling the ribbon cable
connector to the MUT module.
• To ensure that the system will function correctly, the EMC Directives and the measures
derived from them must be observed
(see section 5.1.1 Installation Instructions for
Following the EMC Directives, and section 5.1.2 Instructions on Meeting the EMC
Requirements on the SUPREMA Control System).
The cables are to be connected to the SUPREMA and to the sensors in observance of the
allowable cable cross sections and the maximum cable lengths. A detailed description of the
connections can be found in the connection diagram for the type of sensor in question and in
the sensor data sheet (see Appendix). The operating and maintenance instructions of the
sensor to be connected should also be noted.
5.6.2 Notes for the Operation With Catalytic Combustion Sensors
Sensor poisons
For the safe operation of the catalytic combustion sensors it must be made sure that in the
environmental air no substances and gases which damage or poison the sensor appear. The-
se sensor poisons are a. o. Silicone, Silane compounds, Hydrogen Sulfide, Sulfur compounds.
In the case of doubt a MSA-Auer employee must be contacted to judge on the spot the possible
appearance of sensor poisons and suggest alternative measurement procedures.
Oxygen Concentration
Catalytic combustions sensors operation ist only possible at an O
2
concentration of above 10
Vol.%. At O
2
concentrations above 22 Vol.%, the EX approval for remote measuring heads
becomes invalid.
Measuring Free
Before the installation of the sensors it must be made sure that the environmental atmosphere
is free of combustible gases (e.g. by check with hand-held test instruments). The unambiguity
otherwise cannot be ensured to the measuring value indication at the SUPREMA.
3-conductor operation of passive sensors
At use of passive sensors in 3-conductor operation, the requirements of line control according
to EN 50054 are comply only up to a maximum line- resistance of 1.7 Ohm pro lead respectively
3.4 Ohm loop resistance. If the line-resistance exceeds 1.7 Ohm pro lead respectively 3.4 Ohm
loop resistance the 5-conductor operation is recommended.
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