SVC 4- 1
Section 4
DETECTORS
REPLACING DETECTOR COMPONENTS
There are five detector options available for the HP 5890 Series II Gas Chromatograph; Thermal
Conductivity (TCD), Flame Ionization (FID), Nitrogen- Phosphorus (NPD), Electron Capture (ECD), and
Flame Photometric (FPD). Maintenance procedures for all the detectors are given in the following
pages. Procedures are supplied to remove, replace, and/or clean various subassemblies, based on the
current maintenance philosophy, i. e., to allow replacement of the lowest level components applicable
for a particular detector.
Specific part numbers are not given in this section. For all replacement part numbers, refer to Section 2
of the IPB portion of this document (Detector Options).
All of the detectors are heated using a heater/sensor setup which consists of at least one heater car-
tridge and one sensor cartridge. Heating of the detector zones is not covered in this section. For infor-
mation on the zone heater/sensor systems, refer to Section 6 of the service portion of this document
(Zone Temperature).
This document is not meant to provide instruction for first time installation of the detector options dis-
cussed. Add- on sheets exist for just this purpose, and should be referenced when performing a first
time installation.
TABLE OF CONTENTS
REPLACING DETECTOR COMPONENTS
SVC 4- 1
. . . . . . . . . . . . . .
DETECTOR TROUBLESHOOTING
SVC 4- 3
. . . . . . . . . . . . . . . . . . . .
THERMAL CONDUCTIVITY DETECTOR (TCD)
SVC 4- 4
. . . . . . . . .
Remove/Replace TCD Detector Weldment
SVC 4- 4
. . . . . . . . . . . . . . . . . . . . . . . . . .
Remove/Replace TCD Solenoid Switching Valve
SVC 4- 8
. . . . . . . . . . . . . . . . . . . .
FLAME IONIZATION DETECTOR (FID)
SVC 4- 11
. . . . . . . . . . . . . . . .
Remove/Replace FID Ignitor
SVC 4- 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove/Replace FID Diode Bridge Assembly
SVC 4- 12
. . . . . . . . . . . . . . . . . . . . . . .
Remove/Replace FID Collector Body/Collector Assembly
SVC 4- 14
. . . . . . . . . . . . .
Remove/Replace FID Jet
SVC 4- 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove/Replace FID Detector Weldment
SVC 4- 21
. . . . . . . . . . . . . . . . . . . . . . . . . .
NITROGEN- PHOSPHORUS DETECTOR (NPD)
SVC 4- 28
. . . . . . . .
Remove/Replace NPD Active Element Power Transformer (Toroid)
SVC 4- 28
. . . . .
Remove/Replace NPD Collector
SVC 4- 33
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove/Replace NPD Jet
SVC 4- 35
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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