Switching on
Press “ ” key and the detector will be switched on after two beeps.
Switching off
At measuring
status, press and hold “ ” key down, the detector will be switched off
after 5 seconds’ countdown; if the holding time for pressing “ ” key is not long enough, the
detector will be brought back to the measuring status.
Low power
Audible and visible alarm for undervoltage will be activated if the battery voltage is
lower than the pre-set value. And the battery should be recharged at such situation. At
undervoltage alarm, the screen will also display a detection failure symbol
besides the
audible and visible alarm, and meanwhile the symbol
for detection pass will flicker
together with the symbol
for battery undervoltage. When the power is exhausted, the
symbol
for detection failure will flicker together with the symbol
for battery
undervoltage, and
the screen will display an indication of “battery off”, and then the
detector will be switched off automatically.
After an undervoltage alarm, the detector should be switched off and recharged for
4~6 hours around.
3.1 Functional description of the operating keys
LCD Display
The LCD screen has an
auxiliary function of background
light displaying which will be
automatically activated at alarm
when the gas concentration has
exceeded the alarm point; at
normal detecting in an
environment with weak light, it
can be activated by pressing UP
Key or DOWN Key once.
1. Detection pass
2. Detection failure 3.
Grade I Alarm
4. Grade
II Alarm
5. STEL Value
6 .TWA Alarm
7 Battery
8. %LEL (unit) 9. %Vol (unit)
10. PPM (unit)
