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11-1

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

) ALARMS

Up to three (3) instantaneous alarm levels are

programmable, one (1) rising and two (2) falling (to trigger

alarms in O

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.

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Heath-consultants GT Series Manual de usuario Pagina 105