Industrial Scientific Oldham MX52, Commissioning, Operating And Maintenance Manual

Page: 47 / 89

48
6
6
.
.
M
M
A
A
I
I
N
N
T
T
E
E
N
N
A
A
N
N
C
C
E
E
REMINDER
The handling operations and adjustments described in this chapter must be performed by
authorized personnel only, as they are liable to affect detection safety.
6.1.
Periodic / preventive maintenance
6.1.1. On the MX52 unit
The MX52 measuring unit requires practically no surveillance. It is, however, recommended that
the facilities available on the MX52 unit should be used to regularly test the appliance’s essential
functions, as follows:
Use the TEST key to check the correct operation of all the LEDs and the buzzer.
Use the “SIMULATION” menu to check the correct operation of the display panel, the triggering of
alarms (LED and relays), the slaving controls and the 4-20 mA current output.
Cause a fault to occur (such as a line fault by disconnecting a detector wire) to check the correct
operation of the fault “stages”.
6.1.2. On the detectors
The detectors must be calibrated at least twice a year.
Case 1
Detectors without integrated electronics (CAPTEX, CEX800, CEX810, etc.)
With this type of detector, the zero and sensitivity adjustments must be made on the MX52 unit.
SEE THE CHAPTER ON CALIBRATIONS (see 5-3, case 1) and carry out the operations
specified.
Case 2
Detectors with integrated electronics (CTX50, CTX100, CTX870, etc.)
With this type of detector, and for periodic maintenance, all that is required is action on the
detector. SEE THE CHAPTER ON CALIBRATIONS (see 5-3, case 2) and carry out the operations
specified.