PerkinElmer Photovac MicroFID, User Manual

Page: 124 / 170

MicroFID Software Manual
Action. Check the hydrogen contents gauge on the
side of the instrument and refill the
hydrogen cylinder if necessary. See Filling
the Hydrogen Cylinder on page 30.
Action: Ensure the hydrogen purge outlet is closed.
See Emptying the Hydrogen Cylinder on
page 110. Refill the hydrogen cylinder if
necessary. See Filling the Hydrogen
Cylinder on page 30.
Cause: Oxygen supply is deficient.
Action: Ensure there is an adequate supply of
oxygen, Do not attempt to ignite the flame
in a location where there is greater than
10,000 ppm methane or the equivalent
concentration of a flammable gas. Move to
a location where there are lower
concentrations and start the flame and then
begin sampling higher concentrations.
If the flame goes out while you are
sampling very high concentrations, it is
possible that you are sampling above the
flame out concentration. The flame out
concentration for methane is approximately
52,000 ppm (5.2% methane in air).
A minimum of 17% oxygen is required to
start the hydrogen flame. Oxygen is
supplied from the sample as it is drawn in
by the pump. A minimum of 10% oxygen
is required to maintain the hydrogen flame.
If you will be using the MicroFID in a
highly contaminated area where it is
possible that the oxygen content is below
10%, watch for indications of reduced
flame height such as lowered detection
limits or a flame out fault.
Cause: Exhaust port is blocked.
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