Teledyne 356WA instruction manual Power, Warm-Up and Stabilization, Calibration

Trace Oxygen Analyzer Operations 4

1)At start-up, the humidity control knob should be set to 30. Note the cell electrolyte level as a reference. Approximately 3/32" of the bottom edge of the screen assembly should be immersed in the electrolyte.

2)Operate the analyzer for 24 hours and compare the electrolyte level with the “reference” established in Step 1. If the level is lower than the reference, adjust the knob a few divisions clockwise; if higher, adjust a few divisions counterclockwise.

3)Operate another 24 hours and repeat Step 2.

4)Continue adjustments at ever-increasing intervals until a constant electrolyte level is attained in the cell.

Once the analyzer is suitably located, all components serviced and installed, and sample and electrical connections made, the instrument is ready for operation.

4.5Power

When power is turned on, power is applied to the cell compartment heater. The cell operates without applied power, but its output will vary with changes in ambient temperature.

4.6Warm-Up and Stabilization

When the analyzer is initially put into operation, the air in the lines and sample passages will drive the output indication to the top of the scale. The time required to sweep out this residual air may be several hours before an on-scale indication is reached. During this time the cell compartment is heating and reaching its controlled temperature.

4.7Calibration

The analyzer is calibrated by adding a known amount of oxygen into the analyzer by means of a calibrated span gas. The sensitivity of the ana- lyzer is adjusted until the change indicated by the analyzer is equal to the amount of oxygen known to be present in the span gas. The span gas must be composed of the same elements as the specified sample gas if the analyzer's calibrated flowmeter is to be used. TBE/AI recommends that the oxygen content of the span gas be between 70–90% of full scale on the range of interest.

Teledyne Analytical Instruments 4-7