G F M 4 0 0 S E R I E S U S E R M A N U A L
Operation – GFM430
The GFM430 has been designed to offer the user a handheld instrument with
reading channels of CH4, CO2, O2, optional built in extra gases (up to 4), SP
(static pressure or pipeline pressure), FLOW (borehole gas flow), DP (borehole
pressure) and gas velocity with an optional vane anemometer.
Front panel controls
1. Light. This key switches the screen
backlight on and off.
2. Auto Zero. This key is used to zero the
differential pressure (DP) transducer
and static pressure (SP) channel.
3. Calibrate, Start Pump or Start
Sample. This key changes its
function according to which screen is
displayed. It either switches the
instrument to Calibrate mode, turns
on the sample pump in the gas
measurement mode or takes a
pressure sample in other modes.
4. Up. This key scrolls up the gas
channels.
5. Previous. This key moves the
instrument to the previous group.
6. Next. This key cycles the instrument through to the next group.
7. Down. This key scrolls down the gas channels.
8. Power ON/OFF. This key simply toggles the instrument on or off. Under
battery power, the instrument will automatically turn itself off if no key is
pressed for 10 minutes
.
NOTE: Keys 1, 2 and 3 are ‘soft’ keys and can have different functions as
indicated on the LCD screen above them.
GFM400 Series 11 GFM400 Series User Manual
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