HP 5890 SERIES II Service Manual page 71

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.
REPLACING DETECTOR COMPONENTS
DETECTOR TROUBLESHOOTING
THERMAL CONDUCTIVITY DETECTOR (TCD)
Remove/Replace TCD Detector Weldment
Remove/Replace TCD Solenoid Switching Valve
FLAME IONIZATION DETECTOR (FID)
Remove/Replace FID Ignitor
Remove/Replace FID Diode Bridge Assembly
Remove/Replace FID Collector Body/Collector Assembly
Remove/Replace FID Jet
Remove/Replace FID Detector Weldment
NITROGEN- PHOSPHORUS DETECTOR (NPD)
Remove/Replace NPD Active Element Power Transformer (Toroid)
Remove/Replace NPD Collector
Remove/Replace NPD Jet
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SVC 4- 1
Section 4
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