GMI First Responder, User Handbook Manual

Page: 24 / 104

FIRST RESPONDER - USER HANDBOOK
2-6
Fig. 2-6 Carbon Monoxide Range
Alarms
LEL and CO Ranges
Both the LEL and CO ranges have, by default, audible and
visual alarms active. The audible alarm is rated up to 85
dB(A) at 0.3m (1ft.) 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.
The First Responder has the high instantaneous alarm
level setting of 35 ppm CO and 20% LEL activated by
default. Other values can be set if required.
Alarm Functions
For Flammable LEL and Carbon Monoxide ranges in the
instrument, the alarm function default is that the alarms
will be non-latching and both the audible and visual
functions will operate. That is, where an alarm level is
exceeded, the instrument LED flashes and the sounder
pulses rapidly. These alarms clear automatically when
the gas levels fall below the alarm limit.