26
MX 15
Instruction Manual
Connecting detectors other than
Oldham
detectors to the MX 15 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 15
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 9: Configuration transfer curve 0 to 100 % LEL
Caution: when the measurement is above or equal to 100 % LEL,
the measurement controller records that the scale has been
exceeded; the channel switches to alarm and fault mode. The user is
responsible for manually rearming these settings, following the
safety regulations applicable at their site. Rearming can be
accomplished by restarting the controller or through a maintenance
operation.
Power supply and resistance characteristics
■
Maximum current available between terminals 2 and 3: 300 mA under 20
V.
■
Maximum voltage without load between terminals 2 and 3: 30 V.
■
Resistance between terminals 1 and 2: 47 ohm.
Markings:
OLDHAM Arras
II (3) G
OSA 05ATEX0120
LEL Display in %
ABOVE
100% LEL
0% LEL
-15% LEL
Fault
Fault
Signal delivered by
the detector in mA
Summary of Contents for MX15
Page 10: ...6 MX 15 Instruction Manual...
Page 22: ...18 MX 15 Instruction Manual...
Page 25: ...6 Declaration of Conformity 21 Chapter 6 Declaration of Conformity...
Page 26: ...7 Technical specifications 22...
Page 31: ...27...
