Teledyne gfc 7000ta operation manual Inability to Zero Touchscreen Zero Button Not Visible

Troubleshooting Model GFC7000TA Carbon Dioxide Analyzer

10.3.4. Inability to Zero – Touchscreen ZERO Button Not Visible

1.Confirm that there is a good source of zero air. Dilute a tank of span gas with the same amount of zero air from two different sources. If the CO2 Concentration of the two measurements is different, there is a problem with one of the sources of zero air.

2.Check for leaks in the pneumatic systems as described in Section 9.3.3.

3.If the analyzer has had zero/span valve options 52 or 53, the CO2 scrubber may need maintenance.

4.Check to make sure that there is no ambient air leaking into zero air line.

Teledyne Analytical Instruments 237