Det-Tronics PW9200x Pathwatch IR Gas Detection System - Manual (Page 22)

NOTE
DO NOT TOUCH the lamp envelope with bare
fingers. Use the lamp wrapper provided with the
new lamp, clean white gloves, or clean optical
tissue when inserting a new lamp. Also, be care-
ful to avoid touching the inner surface of the
reflector.
7. Be sure that the lamp is centered in the reflector
and does not touch the edge of the reflector
opening. If the lamp is touching the reflector,
gently apply sideways pressure to bend the
lamp/socket assembly until it is no longer touch-
ing the reflector opening and is centered. Use
clean gloves, tissue, etc., and do not touch the
reflector surface or lamp envelope with bare
hands, since acid from the fingertips will etch the
lamp envelope and reduce the life of the lamp.
8. Replace the window assembly and tighten down
securely until at least five full threads are
engaged.
9. Check tightness of cover bolts and window
assemblies on both housings.
10. Reconnect power wires in the junction box.
11. Close and recheck tightness of junction box
cover.
12. Re-apply power.
13. Repeat “Optical Alignment” procedure.
TROUBLESHOOTING
For assistance in rectifying setup problems and sim-
ple malfunctions, consult the Troubleshooting Table
below.
SYMPTOM: Transmitter lamp does not light.
POSSIBLE CAUSE: No power to transmitter.
CHECK: Voltage into transmitter. Should be
nameplate voltage rating (±10%).
REMEDIAL ACTION: If wrong voltage, check
external fusing or defective power wiring
to transmitter.
POSSIBLE CAUSE: Fuse blown in transmitter.
CHECK: Fuse.
REMEDIAL ACTION: Replace fuse.
POSSIBLE CAUSE: Defective lamp.
CHECK: Voltage into transmitter before con-
cluding that lamp is defective.
REMEDIAL ACTION: See Replacement of
Transmitter Lamp procedure.
SYMPTOM: Transmitter lamp consistently burns
out before 6 months.
POSSIBLE CAUSE: Constant high line voltage.
CHECK: Voltage into transmitter. Should be
nameplate voltage rating (±10%).
REMEDIAL ACTION: Reduce power line volt-
age.
POSSIBLE CAUSE: Excessive vibration or shock
at the transmitter.
CHECK: Environment at transmitter.
REMEDIAL ACTION: Alter mechanical envi-
ronment at transmitter location with vibra-
tion isolators, etc.
POSSIBLE CAUSE: Repeated application and
removal of power to transmitter.
CHECK: History since installation.
REMEDIAL ACTION: Maintain power to the
instrument at all times.
SYMPTOM: Transmitter lamp lights, but no output
voltage on NUMERATOR (blue) relative to
GROUND (green) test jack.
POSSIBLE CAUSE: No power to receiver.
CHECK: Voltage into receiver. Should be
nameplate voltage rating (±10%).
REMEDIAL ACTION: If wrong voltage, check
external fusing and power wiring to
receiver.
POSSIBLE CAUSE: Fuse blown in receiver.
CHECK: Listen for faint sound of filterwheel
motor in receiver.
REMEDIAL ACTION: If filterwheel is not turn-
ing, replace fuse.
POSSIBLE CAUSE: Filterwheel motor failure.
CHECK: Is filterwheel rotating?
REMEDIAL ACTION: If filterwheel does not
rotate after replacing fuse, see
“Replacement of Filterwheel Motor” pro-
cedure.
POSSIBLE CAUSE: Transmitter and receiver not
properly aligned.
CHECK: Voltage on NUMERATOR (blue) test
jack when a flashlight or 60 watt light bulb
is held in front of receiver window.
Voltage should increase from zero.
REMEDIAL ACTION: Repeat Alignment pro-
cedure.
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