Teledyne 7300A manual Ndir Analyzer Measurement Cell, System Self Diagnostic Test

Infrared Gas Analyzer Maintenance 5

5.3 NDIR Analyzer Measurement Cell

The Infrared Analyzer contains an auto zero circuit which automatically zeroes the analyzer. This zeroing compensates for dirt in the sample cell and, under normal circumstances, will compensate for very large amounts of contamination in the cell. If there is a need for removing the cell and cleaning it, follow this procedure:

A)Turn off power to the analyzer and open the optical bench housing. Disconnect the cell heater wires (if present).

B)Remove the cell assembly from the optical bench. Non-sealed cells can be swabbed with water and alcohol and dried thoroughly before reassembly. Sealed cells can be blown out with air, washed, or replaced.

C)After the cells have been cleaned and thoroughly dried,

reassemble them into the optical bench. Also attach any disconnected wiring back onto the bench and check all connections and fasteners.

D)Turn on the analyzer and allow it to warmÄup for at least ten minutes. Check for zero and span gas response.

NOTE: Typically, sample cell should only be removed for cleaning when the Auto Zero circuit can no longer com~ensate for offset or if there is a loss of sensitivity caused by cell lnefficiency .

5.4System Self Diagnostic Test

1.Press the System button to enter the system mode.

2.Use the < > arrow keys to move to More, and press Enter.

3.Use the < > arrow keys to move to Self-Test, and press Enter. The following failure codes apply:

Teledyne Analytical Instruments 5-3