Oldham MX 32, Installation And Operating Manual

Page: 38 / 48

34 MX 32
Instruction Manual
Calibration
Gas detectors are safety devices. Accordingly, OLDHAM recommends regular
testing of fixed gas detection installations. This type of test consists of
injecting a standard gas of sufficient concentration into the sensor to set off
the pre-adjusted alarms. This test does not, in any event, replace a full
calibration of the sensor.
Frequency of gas testing depends on the industrial application in which the
sensors are used. Inspection should occur frequently during the months
following installation start up, later it may be spaced out if no significant
problem is observed.
If a detector does not react upon contact with gas, it must be
calibrated. Calibration frequency should be adapted based
on test results. However, it should not be greater than one
year.
Safety Procedures
The site manager is responsible for implementing the safety procedures on
his site.
Oldham is not responsible for implementing safety procedures.
■ Refer to the Menu Initialization paragraphs (page 23).
■ Do not forget to complete a system start-up after changing the sensor by
using the "INI" menu ( Menu Initialization (INI) paragraph, on page 23).
Fuse replacement
Replacement of the fuses should only be performed by a qualified
professional. The fuses in use must conform to CEI 127 regulations (time-
delayed, low breaking capacity, 250 V AC power source). Please see the
following paragraph.
Parts
Description Reference
Fuse F7 (2 A T, 250 V AC)
– Versions 115 or 230 V AC.
6 154 624
Fuse F8 (315 mA T, 250 V AC)
– Version 115 V AC.
6 154 722
Fuse F8 (160 mA T, 250 V AC)
– Version 230 V AC.
6 154 723
Fuse F9 (315 mA T, 250 V AC)
– Version 115 V AC.
6 154 722
Fuse F9 (160 mA T, 250 V AC)
– Version 230 V AC.
6 154 723
Fuse F11 (630 mA T, 250 V AC). 6 154 627
Fuse F13 (630 mA T, 250 V AC). 6 154 627
Programming strip 340 mA 6 353 442
Programming strip 4-20 mA 6 353 443
Dual channel analog card 6 451 476
Single channel analog card 6 451 477
Channel extension card 6 451 478
Micro card (display) 6 451 475