Tcd Zero Adjust (Filament Tcd Only); Stopping The Analyzer - ABB PGC2000 Operation And Service Manual

21. On the Start/Stop Analysis screen, cursor to "At End of Analysis?" and then press the F2 (Stop
Analyzer) soft key.
22. Press the F1 soft key as necessary to return to the Background screen.

TCD Zero Adjust (Filament TCD Only)

To adjust the Thermal Conductivity Detector (TCD) zero, perform the following steps:
1. On the Background screen press the F2 (Manual Control) soft key.
2. On the Manual Control Mode screen press the F2 (Detector and Graphics) soft key.
3. On the Chroma Board screen press the F3 (Manually Zero Baseline) soft key. The Detector
Reading should change to a value of 2.00 mV ± 0.05 mV.
4. Note the readings (on the Chroma Board screen) for Hardware Zero, Software Zero, and Detector
Reading values.
5. Open the Controller front door.
6. Locate the TCD Amplifier PCB on the left side wall of the GCC and remove the plug covering the
Zero Adjust Potentiometer (see Figure 2-16).
7. Adjust the Zero Adjust potentiometer until the Detector Reading is equal to the sum of the
Hardware Zero and Software zero values noted in step 4.
8. Press the F3 (Manually Zero Baseline) soft key and recheck the readings. The detector is
adequately zeroed when the Hardware Zero percentage is less than 10%.
Zero Adjust
Potentiometer

Stopping the Analyzer

To stop the analyzer perform the following steps:
1. On the Background screen press the F1 (Exit to Commands) soft key.
2000-OSM, F1
Figure 2-16. TCD AMPLIFIER PCB
2-31