5.1 Trouble shooting
112
(3)
Detector (FID)
WARNING
If you finally cannot ignite the FID, ALWAYS shut off Hydrogen gas supply and maintenance/inspect the
instrument for safety.
Problem Possible cause Solution Reference
Cannot ignite or flame
is extinguished
Column is not connected. Connect column.
The length of the inserted
column is not correct.
Ensure that the length of the
column inserted in the detector
is 99 mm. If not, adjust the
length with ferrule adjuster.
Jet is clogged. Perform maintenance for the jet
or replace it.
Igniter filament is broken. Replace the igniter.
Hydrogen, air, or detector gas is
not supplied or their flow are not
correct.
Supply them and set the flows
at proper values.
Detector temperature is low. Set detector temperature at a
higher value.
The air in the tubing is not
adequately replaced with
hydrogen gas.
Repeat ignition sequence
several times to replace the air
completely.
Baseline is fluctuating Carrier gas is leaking. Tighten the leaking
connections.
Replace pipes or septa.
Refer to [1.3 Gas
supply plumbing] in
Instruction Manual.
Carrier gas quality is poor. Replace carrier gas with a purer
one.
Provide a molecular sieve filter
in the carrier gas flow line.
Molecular sieve filter is
saturated.
Condition the molecular sieve
filter.
Refer to "4.10 Flow
controller (SPL, WBI
only)" P. 98.
Baseline is fluctuating Injection port is contaminated. Cleanse or inspect the glass
insert.
Refer to "4.6 Glass
insert" P. 91.
Compressed air is
contaminated (This is the case
if the baseline fluctuates
synchronizing to the increase/
decrease of the compressor
pressure).
Install a silica gel trap on both
end of the pressure governor.
Use air supplied from a gas
cylinder.
Hydrogen gas has not been
supplied for long enough to
replace the air in tubing.
Wait for 30 to 60 minutes to
allow the air to be completely
replaced with hydrogen.
Room temperature is not within
the recommended range, or is
fluctuating considerably.
Keep the room temp. within the
recommended range and
stabilize the temp. at a certain
level.
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