HP 5890 SERIES II Service Manual page 192

ZONE TEMPERATURE
REPLACING TEMPERATURE CONTROL COMPONENTS
The HP 5890 Series II uses heater cartridges to apply and temperature sensor cartridges to sense heat
at the various heated zones (inlets, detectors, and valve box, if installed). Replacement of a heater/sen-
sor cable assembly (which consists of the heater and sensor cartridges, as well as the wiring connect-
ing them to the main PCB) is accomplished by partial removal of the applicable heated zone compo-
nent. In addition, the heater/sensor cable assembly must be disconnected from the applicable
connectors on the main PCB. Removal of the wiring from the connectors on the main PCB is covered
first, followed by instructions for removal of the heater and sensor cartridges from the heated zone com-
ponents.
If a TCD detector is installed, a delta- t temperature sensor is used in addition to the standard tempera-
ture sensor cartridge. Removal and replacement of the delta- t temperature sensor cartridge is dis-
cussed after the procedures for standard heater/temperature sensor cartridges.
The HP 5890 Series II also uses an optional cryogenic valve to cool the PCOC inlet. While the cryogen-
ic valve is discussed with oven components in Section 5 of the service portion of this document, remov-
al of the PCOC nozzle (which carries the cooling gas from the valve to the inlet) is discussed in this sec-
tion.
Specific part numbers are not given in this section. For replacement part numbers, refer to the section
of the IPB applicable to the heated zone component being addressed (i. e. inlets -
tors - Section 2, valve box - Section 7, cryogenic valve - Section 6).
REPLACING TEMPERATURE CONTROL
COMPONENTS
ZONE TEMPERATURE TROUBLESHOOTING
Remove/Replace Inlet, Detector, and Valve Box
Heater/Sensor Cable Assemblies
Disconnect/Connect Heater and Temperature Sensor
Wiring on Main PCB
Remove/Replace Inlet Zone Heater and Sensor Cartridges
Remove/Replace Packed Column Inlet Heater and Sensor CartridgesSVC 6- 9
`
Remove/Replace Septum- Purged Packed Column Inlet
`
Heater and Sensor Cartridges
Remove/Replace Split- Splitless/Split- Only Capillary Inlet
`
Heater and Sensor Cartridges
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TABLE OF CONTENTS
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SVC 6- 1
Section 6
Section 5, detec-
SVC 6- 1
SVC 6- 3
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. . SVC 6- 4
SVC 6- 9
. . . . . . SVC 6- 11
. . . . . SVC 6- 13