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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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HP 5890 Series II User Manual

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