SVC 4- 41
Remove/Replace NPD Detector Weldment
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HAZARDOUS VOLTAGES ARE PRESENT IN THE INSTRUMENT WHEN THE
POWER CORD IS CONNECTED. AVOID A POTENTIALLY DANGEROUS SHOCK
HAZARD BY DISCONNECTING THE POWER CORD BEFORE WORKING ON THE
INSTRUMENT.
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NITROGEN PHOSPHOROUS (NPD) DETECTORS USE HYDROGEN GAS AS
FUEL. BE SURE ALL HYDROGEN GAS IS TURNED OFF AT ITS SOURCE BEFORE
REPLACING ANY FLOW COMPONENTS.
1. Set the main power line switch to the off position.
2. Disconnect the power cable from its receptacle.
3. Allow time for the oven and heated zones to cool.
4. When the heated zones are cool, turn off all gas
supplies.
5. At the bottom of the detector(s) to be removed,
inside the column oven, remove the column
and hardware associated with the detector(s)
(liner, column/liner nuts, ferrules, makeup gas
adapter,etc.).
NOTE
If an autosampler is installed, the injection
port cover will not be present.
6. Remove the injection port cover by grasping its
back edge and lifting it upward.
7. Lift the hinged top cover at its front edge,
exposing the detector area.
8. Remove the 1/4 inch screw and washer
securing the cover at its right side hinge
point.
9. Remove the ground strap from the hinged top
cover by removing a screw.
OFF
ON
RED O VISIBLE
1/4- INCH
SCREW
AND WASHER
INJECTION PORT COVER
TOP COVER
PRESS
HERE TO
FREE
COVER
LID SHAFT
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