Alarms - Linde G-TECTA 4G Operating Manual

Note: The G-TECTA 4G is set to "latch" the alarm
by default. This means that the instrument will continue
to alarm until the operator presses the mode button.
Once you have evacuated the dangerous area, press
the mode button on the G-TECTA
this will reset your G-TECTA
mode. If the G-TECTA
®
are still in a dangerous area, pressing the button will
have no effect.

Alarms

The TWA alarm for toxic gases will operate when
the short-term (15 minute) or long-term (8 hour)
time weighted average alarm levels are exceeded.
The G-TECTA 4G will display
®
toxic gas levels.
WARNING
TWA alarms are functional for toxic

gas instruments only.
WARNING
 The TWA alarms cannot be cleared.
Flammable Over-range Alarm
If flammable gas levels exceed 100% LEL, G-TECTA
4G locks into alarm and displays "
over-range condition. G-TECTA
cut off power to the sensor to prevent burn out,
and display a progress bar for 200 seconds.
Note: The alarm remains active until the instrument
sensor is in normal operating mode.
When the power timeout is complete, the symbol
changes to " " and the mode button should be
pressed to put the instrument back into normal
operating mode. The symbol will change to an egg
timer to indicate that the sensor is warming up.
4G instrument;
®
4G to normal operating
®
4G continues to alarm, i.e. you
and display
" showing an
4G will temporarily
®
At the end of the warm up period and assuming the
instrument is in fresh air, the sensor will revert to a
numeric display.
Note: If the instrument is still in the hazardous area
when the sensor is re-set, the sensor will revert to
an over-range alarm.
The G-TECTA 4G can optionally be configured to
®
force the operator to switch the instrument off and
on to restart. This option is programmable with
G-TECTA PC Software.
®
Note: All alarm configurations can be set with
G-TECTA PC Software.
®
WARNING
If the sensor power is reconnected

when the unit is exposed to an over-range gas
concentration there is a risk of damage to the
pellistor sensor.
WARNING
 Depleted oxygen levels can reduce
the flammable gas reading. If oxygen levels are
below safe breathing limits it should be assumed
that the flammable reading is low.
®
Instrument Settings
The following instrument settings can be altered
using G-TECTA PC Software:
®
Alarm levels for the sensor:
Level 1 and level 2 alarms can be set for each
gas sensor.
Alarm trigger:
The alarm trigger can be set for rising levels of gas
(toxic and flammable), or for falling levels of gas
(oxygen deficiency monitoring).
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