Oldham MX 32, Installation And Operating Manual

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40 MX 32
Instruction Manual
the controller is used with CEX 300 gas detectors and those in the
OLC/OLCT series including 20, 40, 50, 60, 100 and OLCT IR. Where the
controller is used with other types of detectors delivering a current of 4/20
mA, they must conform to ATEX Directive 94/9/EC, Annex II, paragraph
1.5 and be compatible with the characteristics described therein (refer to
the controller transfer curve in Figure 10).
■ European standard EN 50271.
Oxygen gas detectors
■ European standard EN 50104 when the controller is used with OLCT 20,
40, 50, 60 and TBGW-EX gas detectors. Where the controller is used with
other types of detectors delivering a current of 4/20 mA, they must conform
to ATEX Directive 94/9/EC, Annex II, paragraph 1.5 and be compatible
with the characteristics described therein (refer to the controller transfer
curve in Figure 11).
■ European standard EN 50271.
Connecting detectors other than Oldham
detectors to the MX 32 controller
Any user wishing to use detectors other than Oldham detectors must ensure
that they are compatible with the controller, in order for the unit to be
considered a safety device.
Configuration transfer curve 0 to 100 % LEL
The following curve demonstrates the controller response in terms of values
measured and treatment of faults, as a function of the value of the input
current delivered by the detector. In the case that the user connects a non -
Oldham brand detector to the MX 32 controller, the user must ensure that the
transfer curve is compatible with the input characteristics for the controller, so
that the information delivered by the detector will be properly interpreted. In
addition, the controller must provide sufficient supply voltage, taking into
account voltage drops in the cables.
Figure 10: Configuration transfer curve 0 to 100 % LEL
LEL Display in %
ABOVE
100% LEL
0% LEL
-15% LEL
Fault
Fault
Signal delivered by
the detector in mA