Chapter 5 | Maintenance
Gas monitors are safety instruments. Recognizing this fact, OLDHAM recommends
that a functional test be performed on every portable gas monitor prior to each use. A
functional test involves injecting a gas of sufficient concentration at the sensor level to
trigger pre-set alarms. This test does not, in any event, replace a full calibration of the
sensors.
If a gas monitor does not respond correctly to a gas test, a full calibration with a
calibration gas is mandatory.
These recommendations are consistent with applicable industry safety protocols and
with the standards and directives relative to the safety of industrial sites. OLDHAM is
also not responsible for procedures performed onsite.
The gas monitor is factory-programmed to display a maintenance alert if a
calibration has not been performed in the last twelve months (the message
Calibration due will appear on the screen).
The operations explained in this chapter must be performed by authorized,
qualified personnel only, as they could adversely affect detection safety.
Accessing maintenance menus
When in normal operation mode,
■ Scroll to parameters using the / button until a request for an access code
and 0000 is displayed.
■ 0018 is the default code. Scroll to each digit with the button. Use button to
select the right number and confirm access code with the ENTER button.
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