4
Performing Detectors Routine Maintenance
Maintaining a Nitrogen Phosphorous Detector (NPD)
156
TRACE 1300 and TRACE 1310 Hardware Manual
Thermo Scientific
22. Increase the temperature to the operating value: 300 to 320 °C is recommended. Allow
15 minutes for equilibration.
23. Check the NPD leakage current. If > 2.0 pA, verify the installation.
Cleaning or Replacing the NPD Collecting Electrode
To clean or replace the NPD collecting electrode
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. Set the make-up gas off.
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
.
Figure 136.
Unplug NPD Signal Cable
8. Open the module flap cover.
Note
By pressing the
Maintenance
button, the GC cool down is automatically
carried out.
Содержание TRACE 1300
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