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Troubleshooting & Repair Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 302
10. Remove the one (1) screw fastening the GFC Wheel/mask assembly to the GFC motor hub.
11
12
Figure 13-18: Removing the GFC Wheel
11. Remove the GFC Wheel/mask assembly.
12. Follow the previous steps in reverse order to put the GFC Wheel/motor assembly back together.
13.6.3. CHECKING AND ADJUSTING THE SYNC/DEMODULATOR, CIRCUIT
GAIN (CO MEAS)
13.6.3.1. Checking the Sync/Demodulator Circuit Gain
The GFC 7001E/EM Analyzers will operate accurately as long as the sync/demodulator circuit gain is properly
adjusted. To determine if this gain factor is correct:
1. Make sure that the analyzer is turned on and warmed up.
2. Set the analyzer display to show the STABIL or CO STB test function.
3. Apply Zero Air to Sample Inlet of the analyzer.
4. Wait until the stability reading falls below 1.0 ppm.
5. Change the analyzer display to show the CO MEAS
The value of CO MEAS must be > 2800 mV and < 4800 mV for the instrument to operate correctly.
Optimal value for CO MEAS is 4500 mV ± 300 mV. If it is not, adjust the value.