12-2
ALARMSUSER HANDBOOK
averaging essentially makes the instrument single user
applicable. The option is available to restart the averaging
after each instrument switch-off, thus allowing for multiple
user application.
A TWA alarm is intermittent with the actual gas reading,
therefore it is possible to get a value of zero (0) and an LTEL
or STEL alarm.
All alarms are user congurable to meet the specic needs of
different companies.
Note: The gas alarm levels, instantaneous STEL and LTEL, are
set at the time of instrument manufacture. It is important that
the user ensures that the levels are in accordance with their
company’s alarm levels and with health and safety legislation.
The alarm levels may be changed, if required, as detailed in
the ‘SET-UP SOFTWARE USER HANDBOOK’.
In the following examples,
example 1 (Fig. 12.1) shows
an instrument in confined
space mode signalling a
‘LOLO’ Oxygen alarm. The
audible alarm warbles and the
red LED’s ramp.
Example 1:
Toggles to
Fig. 12.1 LOLO Oxygen Alarm
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