Oldham MX 52, Commissioning, Operating And Maintenance Manual

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9.3.2. Device transfer curves in 0% to 30.0% OXYGEN configuration
The following curve shows the response of the device in terms of value measured, and fault
processing as a function of the input current value supplied by the detector. Where the user connects
a brand of detector other than OLDHAM to the MX52 device, he must check carefully that the
transfer curve is fully compatible with the device input characteristics, to ensure that the data
generated by the detector is correctly interpreted. Equally, the device must supply a suitable power
supply voltage, allowing for cable voltage losses.
9.3.3. Power supply and load resistance characteristics
Maximum current available between terminals 2 and 3: 350 mA at 21 V.
Maximum no-load voltage between terminals 2 and 3: 30 V
Load resistance (outside the IS barrier) between terminals 1 and 2: 47 ohms
N.B.: This data applies only where detectors other than OLDHAM are used. Where different
types are mixed, please contact OLDHAM to establish the feasibility of the combination.
9.4. MARKING
OLDHAM
0080
II 2 (G)
INERIS 04ATEX0064
4
mA
20
mA
Signal supplied by
the detector in mA
Display in %
O2 by volume
Fault
Fault
1.2
mA
0.0
%
-5.3%
30.0%
36.0%
23.2
mA