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Alarms
General Information
Alarms can have both audible and visual indications active.
The audible alarm is rated up to 85 dB(A) at 1ft. (0.3m)
approx. The visual alarm is a red LED indicator which
protrudes from the instrument top plate, allowing viewing
from any angle above the top plate.
It is the responsibility of the user to ensure that the alarm
levels, where set in the instrument, are appropriate for the safe
operation and legal requirements for the country / industry in
which the unit is being used.
Alarms in CSM Mode
In this mode, the alarms will be activated when:
•
'HiHi' alarm if LEL gas reading exceeds 20%
•
'Hi' alarm if O2 gas reading exceeds 23.5%.
•
'Lo' alarm if O2 gas reading is less than 19.5%.
•
'Hi' alarm if CO gas reading exceeds 25ppm.
•
LTEL CO alarm 25ppm.
•
'Hi' alarm if H2S gas reading exceeds 10ppm.
•
STEL H2S alarm 15ppm.
•
LTEL H2S alarm 10ppm.
Other values can be set as required.
In CSM mode, alarms are latching. This means that when an
alarm level is exceeded, the instrument LED flashes and the
sounder pulses rapidly. Latching alarms are cleared manually
after the alarm level has fallen below the alarm limit.
GENERAL INFORMATION
2-7
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