86 Model 5380 PFPD Operator’s Manual
Rev. 3.1
Check the serial cable connection to
the PC and Detector Controller.
Reassign serial port.
Verify that carrier, hydrogen, and air
pressure regulators are set correctly
and that gas is supplied to the pneu-
matics module.
Turn the EPC controllers on.
Decrease carrier gas flow rate (if
possible), increase Air 1 to increase
the flame temperature in the combus-
tor, or use a 3-mm I.D. combustor.
Check for gas leaks around the
aluminum sealing washers. Check
column connection and verify that
column has a secure seal and is not
broken.
Replace ignitor. Refer to “Testing and
Replacing the Ignitor Assembly” in
Chapter 6.
Verify that ignitor current is set at
2.8 A and optimize Air 1 flow.
Increase the ignitor setting to 3.3 A
until a regular pulse is obtained. Reset
it to 2.8 A.
Heat the PFPD to 220°–300°C.
Check the setting of the fine adjust
needle valve by removing the locking
screws and knob. Gently turn the
needle valve counterclockwise until
seated, and then turn it clockwise one-
half a turn. Replace the knob and
retighten the lock screw.
Set the GC oven to the highest
temperature that the analysis requires.
Then adjust the needle valve counter-
clockwise to bring it out of tick-tock.
Examine the section of the column that
extends above the combustor support.
If the column’s polyimide coating has
not been cleanly burnt off, add more
Air 1 (or reduce hydrogen flow).
PC’s serial cable is not
connected to the Detector
Controller
Incorrect serial I/O port is
assigned
Gas flows are too low or
not set correctly
EPC controllers are off
Carrier gas flow rate is
too high
Detector is leaking gas
from washers or other
seals
Ignitor is broken or
shorted
Ignitor current is set
incorrectly
Detector body is cold
Fine adjust needle valve
is incorrectly set when
closed
Inconsistent flame
propagation into combus-
tor (tick-tock)
Incomplete propagation
through combustor
SYMPTOM
CORRECTIVE ACTION
PROBABLE CAUSE
No signal
Flame ignition
problems
Tick-tock flame
propagation mode
cannot be
achieved
Flame propagation
problems
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