Teledyne 3000ZA operating instructions Zero and Span Functions

Trace Oxygen Analyzer Operation

TRAK/HLD Auto—Cal

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Use the __ arrow keys to blink More, then press Enter.

Version Self—Test

Show_Negative=NO

Use the __ arrow keys and select “ Show_Negative = NO”. Use the __ arrow keys to toggle from NO to YES.

Press the Escape key twice to return to the analyze mode.

This preference is stored in non-volatile memory so the configuration is remembered after a power shutdown. If the instrument is cold started, it will go back to the default case where negative oxygen readings are not shown.

4.4 The Zero and Span Functions

Zeroing is not required in order to achieve the published accuracy specification of this unit however, zeroing will eliminate offset error contributed by the sensor, electronics and the internal and external sampling systems. It will improve performance beyond published specification limits.

The analyzer is calibrated using zero and span gases.

Any suitable oxygen-free gas can be used for zero gas as long as it is known to be oxygen free and does not react adversely with the sample system.

A span gas with a known oxygen concentration in the range of 70–100% of full scale of the range of interest is recommended. In the 0- 10 ppm range, 8 ppm span gas would be best suited.

Connect the calibration gases to the analyzer according to the instructions given in Section 3.3.1, Gas Connections, observing all the prescribed precautions.

Shut off the gas pressure before connecting it to the analyzer, and be sure to limit the pressure to 40 psig or less when turning it back on.

Readjust the gas pressure into the analyzer until the flowrate (as read on the analyzer’s SLPM flowmeter) settles between 0.1 and 2.4 SLPM (approximately 0.2 - 5 SCFH).

Teledyne Analytical Instruments 39