Replacing The Npd Thermionic Source - Thermo Scientific TRACE 1600 Hardware Manual

4
Performing Detectors Routine Maintenance
Maintaining a Nitrogen Phosphorous Detector (NPD)

Replacing the NPD Thermionic Source

162 TRACE 1600/1610 Hardware Manual
Materials needed to maintain a NPD detector
T10 Torxhead screwdriver
6 mm wrench
Note For maintaining or replacing any other component not listed in this section, see
Chapter 7, "Detectors Advanced Maintenance."
• "Measuring the NPD Gas Flows"
• "Cleaning or Replacing the NPD Jet"
CAUTION The thermionic source is delicate. Be careful not to break or crack the source.
When performing maintenance on the NPD, avoid touching the source with your fingers,
and prevent it from coming in contact with other surfaces. Wear clean, lint-free gloves to
prevent contamination of parts with dirt and skin oils.
ATTENTION La source thermo-ionique est fragile. Veillez à ne pas briser ou fissurer la
source. Pendant la maintenance du NPD, évitez de toucher la source avec les doigts et
empêchez-la d'entrer en contact avec d'autres surfaces. Portez des gants propres et non
pelucheux pour éviter de contaminer les pièces avec de la poussière ou de sébum.
 To replace the thermionic source
1. Put the GC in standby condition.
2. Switch off the thermionic source. Hydrogen and air are automatically closed.
3. Cool the detector to room temperature.
4. Turn the make-up gas off.
Note By pressing the Maintenance button, the GC cool down is automatically
carried out.
5. Power off the GC.
a. Push down the power switch (breaker), located at the back of the instrument, to the
position O.
b. Unplug the power cable from the AC Input connector into the back of the GC and
from the wall outlet.
6. Unplug the power cable from the AC input connector of the NPD Thermionic Source
Power Module and from the wall outlet.
If other external modules are present, unplug the power cable from the AC Input
connector of each module, and from the wall outlet.
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