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1.3.6. CO2 detector of type “Ventostat VT”
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Connection on MX52 unit: see Fig. 20.
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Resistance of detector/unit power cable: 12 ohms maximum per wire, i.e. 24 ohms
in loop.
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4-20 mA output: maximum load = 280 ohms (whole loop)
1.3.7. Specific case of CTX100 / COX 100 intrinsic safety detectors
Two types of intrinsic safety barrier can be used: Z787 / EX and .
PRECAUTIONS
Before connecting the barrier to the unit, check that the voltage is < 25 V DC.
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A short circuit in the electrical connections will result in destruction of the barrier.
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Perform wiring in the DE-ENERGIZED state.
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The electrical link between the MX48 unit and the clipper is made using a
screened cable with two active conductors with a maximum resistance of 12 ohms
each.
REMARK
In classified areas, the installation must comply with the standards in force.
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Connections on MX52 unit: see Fig. 21.
IMPORTANT
All intrinsic safety installations must be APPROVED as a whole assembly by an approved
organization (DRIRE, etc.).
OLDHAM “INTRINSIC SAFETY” BARRIERS
Type of IS barrier
Reference
Specific features
OLDHAM box
reference
Z787 / EX
6184703
To be fitted on DIN RAIL
6797100
To be fitted in an approved
box: MANDATORY
For 2 clippers
6797192
For 5 clippers
6797547
For 12 clippers
6797101
1.3.8. Other detectors with standardized current output
Any detector (with 2 wires or 3 wires) that can be supplied with power between 19 V DC and
32 V DC and that supplies a standardized current (signal) of between 4 and 20 mA can be
connected to the MX52 unit.
The connection requirements are identical to those for the corresponding OLDHAM detectors
(see Fig. 22).
Summary of Contents for MX 52
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