Replacing The Npd Thermionic Source - Thermo Scientific TRACE 1310 Hardware Manual

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

Replacing the NPD Thermionic Source

150 TRACE 1300 and TRACE 1310 Hardware Manual
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.

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.
7. Unplug the signal cable from the detector module. See
on page 276
on page 285
Figure 126.
Thermo Scientific