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PS200
PORTABLE GAS MONITOR
ALARMS
4. ALARMS
4.1. Gas Alarms
When an alarm set-point has been reached, the audible, visual, and vibrating alarms will activate to
alert the users. All gas alarms are configurable to meet the specific needs of users and only oper-
ate once the monitor warm-up is complete.
An alarm can be either 'latching' or 'non-latching'. A 'latching' alarm will remain active until reset by
the user by pressing and holding the R button after the gas readings have returned to a safe level.
A 'non-latching' alarm will reset automatically when the gas readings are safe.
4.1.1. FLAMMABLE LEL ALARM
Two alarm levels, 'HI' and 'HIHI', are available.
4.1.2. OXYGEN (O
) ALARM
2
Three alarm levels, HIHI, LO, and LOLO, are available.
4.1.3. TOXIC ALARM
The monitor calculates the Short Term Exposure Limit (STEL) and Long Term Exposure Limit
(LTEL) – known as Time Weighted Average (TWA) readings – for each toxic gas range. Each toxic
range has STEL and LTEL alarms, in addition to HI and HIHI alarms.
NOTE: A TWA value is the mean gas level exposure over a specific period. The STEL is
15 minutes and the LTEL is 8 hours. Usually, TWA alarms mean the monitor is for a single
user. For multiple user applications, an option is available to reset the STEL and LTEL
after each monitor switch-off.
NOTE: All alarm levels – HI, HIHI, LO, LOLO, STEL, and LTEL – are factory set . The user
must set the levels in accordance with their company's procedures and with local health
and safety legislation. Alarm levels can be changed via the monitor set up menu.
In the following examples,
Figure 4-2: LEL HIHI Alarm
64171, Rev. 11/December 2019
Figure 4-1: O
LOLO Alarm
2
shows a 'HIHI' LEL alarm.
Figure 4-1: O
shows a 'LOLO' Oxygen alarm, and
LOLO Alarm
2
4-1
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