Oldham MX 52, Commissioning, Operating And Maintenance Manual

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1.1. General
The MX52 measuring and alarm unit can be fitted with between one and 16 independent channels.
Each channel is connected to one or more detectors installed in the locations to be monitored.
The measurement that is output from the detector is displayed on the MX52 unit and compared with
alarm thresholds. If thresholds are exceeded, the unit actuates relays which can be used to control
external devices.
REMARK
The equipment of the MX52 unit comprises line PCBs, each equipped with two channels. However,
each channel is independent and can be connected to any type of OLDHAM detector provided that
the PCB is suitably programmed. The number of line PCBs is always equal to the mixed even
number greater than the number of channels used divided by two.
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
Rack 3U 19”

AC or DC power supply

16 measuring inputs for detectors

Display of measurement on a plasma display panel (2 lines - 16 characters)

One keypad with four keys for the user

One “CALIBRATION” key and one “PROGRAMMING” key for maintenance
(accessible only by opening the front panel)

3 gas alarms per channel
- Two instantaneous rising or falling thresholds, manual or automatic clearing, with
“extractor control logic (tunnel parking application)”
- One rising or falling threshold, automatic clearing, triggering by time delay or
average
Relaying
Total of 34 relays distributed as follows:
- Two relays per channel, with positive or negative safety, contacts open or closed
at rest for the first two thresholds