Heath Consultants GT Series - Manual (Page 105)

11-1
ALARMS
ALARMS
11.1 GAS ALARMS
The following gas alarms are available according to gas
type and are programmable according to application and
/ or customer preference.
(See Tables 11.1 and 11.2).
11.2 FLAMMABLE (LEL) ALARMS
Up to three (3) instantaneous alarm levels are
programmable. All three are rising alarms, i.e. if the
concentration is above the specific alarm level, the alarm
is triggered.
11.3 OXYGEN (O
2
) ALARMS
Up to three (3) instantaneous alarm levels are
programmable, one (1) rising and two (2) falling (to trigger
alarms in O
2
deficient scenarios).
11.4 TOXIC GAS (e.g. CO) ALARMS
When operating normally, the instrument records minimum
and maximum readings for each gas. It also calculates
the Short Term Exposure Limit (STEL) and Long Term
Exposure Limit (LTEL), known as Time Weighed Average
(TWA) readings, for each toxic gas range as appropriate.
Up to two (2) instantaneous rising and two (2) TWA alarms
are programmable for each toxic range fitted to the
instrument.
11