Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 285)

Troubleshooting and ServiceTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 285
 Optimal value for CO MEAS is 4500 mV ± 300 mV. If it is not, adjust the value.
12.6.3.2. ADJUSTING THE SYNC/DEMODULATOR, CIRCUIT GAIN
To adjust the sync/demodulator circuit gain:
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.
6. Remove the Sync/Demod Housing
 Remove the two mounting screws.
 Carefully lift the housing to reveal the sync/demod PCA.
Sync/Demod
PCA Housing
Housing Mounting
Screws
Optical Bench
Figure 12-19: Location of Sync/Demod Housing Mounting Screws
7. Adjust potentiometer VR1 until CO MEAS reads 4500 mV ± 300 mV
VR1
Adjustment Made Here
Figure 12-20: Location of Sync/Demod Gain Potentiometer