Alarms - Linde G-TECTA 4G Operating Manual

8
Alarm
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.
WARNING
TWA alarms cannot be cleared. TWA

alarms are functional for toxic gas instruments only.
Display Menu Options
The G-TECTA
when you press the mode button twice.
There are up to 3 menu options plus the
Zero
home screen option. To scroll between
the different options, press the mode button once.
To select the menu option you require, double
click on the selected icon. When the Peak and TWA
menu options are selected the relevant icon will be
displayed on the screen.
Peak
The Peak menu option displays the highest gas
level for flammable and toxic gases, or the lowest
level of oxygen, since the instrument was switched
on or was last reset.
After 5 seconds the instrument will display Clear
Peak and "????". Press the mode button to confirm
the Clear Peak function. The instrument will count
down and time out in 10 seconds and change back
to Peak mode if the mode button is not pressed.
The Peak feature is mainly used for confined space
entry checks, where the instrument is lowered into
a potentially hazardous environment (instead of
using a sampling hose), and also for viewing peak
gas exposure at the end of a shift.
4G menu is displayed
®
The TWA menu option displays the 8 hour time
weighted average reading for toxic gases since the
unit was last switched on.
Zero
The Zero menu option will reset the sensor in the
instrument. When the zero function has been
completed, the instrument will return to normal
operating mode.
WARNING
 Always ensure you are in fresh air
when using this feature. Zeroing an instrument in a
contaminated atmosphere could result in incorrect
gas readings.

Alarms

G-TECTA 4G has two instantaneous alarm level
®
settings for each sensor – level 1 and level 2 –
and two additional Time Weighted Average (TWA)
alarms for toxic sensors.
Alarm Signals
The red and blue alarm LEDs will flash, the sounder
will emit a loud, fast series of beeps and the
internal vibrator alarm will activate. The display will
show the gas in alarm and the alarm level.
Alarm icon
CH4
%LEL OO ppm
0
0 . 0
0 . 0
16.7
O2
%
H2S ppm
Gas example
under alarm
* The instrument has 2 alarm levels to give the user an indication
that the gas level may be rising. If any alarm warning is indicated
by the instrument the work area should be evacuated.
For any gas, there are
normally 2 alarm levels*
– these are indicated by
the alarm icons: