G F M 4 0 0 S E R I E S U S E R M A N U A L
Operation – GFM400 and
GFM410
The GFM400 has been designed to offer the user a handheld instrument with
reading channels of CH4, O2, SP (static pressure or pipeline pressure) and gas
velocity with an optional vane anemometer. The GFM410 unit offers 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) and gas velocity with
an optional vane anemometer.
Safe use of the GFM400 Series
The GFM400 Series has been designed to operate in typical field
environments where flammable gases may be present. The following points should
be observed.
Safe practice
♦
BEFORE entering a known hazardous zone, switch on the instrument and
make sure the display is visible.
♦
BEFORE entering a known hazardous zone, check that the keys respond.
♦
BEFORE entering a known hazardous zone, check that the sample pump can
be operated.
Important safety related points
♦
Sampled gas will be discharged from the ‘sample out’ port of the instrument at
a rate of approximately 500ml/min. Make sure this gas will not create a
hazardous zone worse than ZONE 1. See page 26 for full description of
hazardous zones.
♦
Flush the instrument with clean air before sampling to prevent mixing
potentially reactive mixtures of gas within the instrument.
♦
Verify instrument calibration before and after use to minimise the risk of falsely
determining an atmosphere as hazardous or safe.
GFM400 Series
3
GFM400 Series User Manual
Section
1
