Energizer PORTABLE GAS DETECTION INSTRUMENT Especificaciones descargar pdf (Pagina 5)

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.

W A R N I N G



TWA alarms cannot be cleared. TWA

alarms are functional for toxic gas instruments only.

Display Menu Options

The G-TECTA™ 4GP menu is displayed

when you press the mode button twice.

There are up to 4 menu options including

the instrument home screen. 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.

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.

W A R N I N G



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™ 4GP 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.

For any gas, there are normally 2 alarm levels*

– these are indicated by the alarm icons:

Zero

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™ 4GP

instrument; this will reset your G-TECTA™ 4GP

to normal operating mode. If the G-TECTA™ 4GP

continues to alarm, i.e. you 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

and display

toxic gas levels.

W A R N I N G



TWA alarms are functional for toxic

gas instruments only.

W A R N I N G



The TWA alarms cannot be cleared.

Flammable over-range alarm

If ﬂammable gas levels exceed 100% LEL,

G-TECTA™

4GP locks into alarm and displays “ ” showing an

over-range condition. G-TECTA™ 4GP will temporarily

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.

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™ 4GP 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.

W A R N I N G



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.

W A R N I N G



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).

Alarm latching:

Latched alarms require the operator to press the mode

button to clear the alarm (default setting). The alarm can

be set to be latched or unlatched. Unlatched alarms will

clear automatically when the gas hazard has passed.

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.

CH4 %LELCO ppm

H2S ppm

0.0

16.7

Alarm icon

Gas example

under alarm

1 2 3 4 5 6 7 8 9 10 11 12 13

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