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4-3

ALARMS

4.1.1 Flammable LEL Alarm Limit

Two alarm levels, ‘HI’ and ‘HIHI’, are available, each with

different pitch and tone. All alarms are user congurable to

meet the specic needs of different companies.

4.1.2 Over-Range Flammable Gas Alarm Function

The ammable sensor is designed for use in the LEL range

only. Exposure to high concentrations of ammable gas,

such as lighter fuel, can damage the ammable sensor. If the

ammable gas readings exceed 100% LEL, a safety alarm

will be activated. The instrument should then be switched OFF

and returned to fresh air.

4.1.3 Oxygen (O

) Alarm Limits

Three alarm levels, ‘HIHI’, ‘LO’ and ‘LOLO’ are available, each

with different pitch and tone. All alarms are user congurable

to meet the specic needs of the end user.

4.1.4 Toxic Alarm Limits

When operating normally, the instrument 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 alarm. TWA alarms are programmable

for each toxic range tted to the instrument. Additionally, two

alarm levels ‘HI’ and ‘HIHI’ are available.

Note: A Time Weighted Average (TWA) value is the mean

average gas level over a specic period. The STEL is 15

minutes and the LTEL is 8 hours. Typically, TWA alarms make

the instrument single user applicable. An option is available

to restart the averaging after each instrument switch-off, thus

allowing for multiple user application.

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GMI PS241 Specifications

General