306WA - Analog trace oxygen analyzer - Teledyne Analytical ...

4.0 Operations Model 306WA4.6 PowerWhen power is turned on, it is used to heat the cell compartment andto provide current to the calibrator. The cell operates without appliedpower, but its output will vary with changes in ambient temperature.4.7 Warm-Up and StabilizationWhen the analyzer is initially put into operation, the air in the lines andsample passages will drive the output indication to the top of the scale. Thetime required to sweep out this residual air may be several hours before anon-scale indication is reached. During this time the cell compartment isheating and reaching its controlled temperature.4.7.1 CalibrationThe analyzer is calibrated by adding a known amount of oxygen intothe sample stream. The sensitivity of the analyzer is adjusted until thechange indicated by the analyzer is equal to the amount of oxygen actuallyadded.1. Adjust the sample flow rate until the flowmeter float is centeredin the flowmeter reference indicator. Note the reading of theexternal recorder or meter.2. Turn the calibrator power switch to ON. Adjust the calibratorcurrent dial to read the amount of oxygen to be added. The dialreads 0 to 100 PPM O 2(See Appendix A4 for the O 2settings).3. Leave the power and current controls in the positions selectedabove. The calibrator current will continue to flow until thecalibrator power switch is turned OFF.4. If the external recorder/meter does not indicate the properamount of oxygen (sample reading plus added oxygen), adjustthe sensitivity control until it does.5. When the output reaches the proper equilibrium, turn thecalibrator power switch to OFF. The recorder/meter will movedownscale to indicate the oxygen content of the sample.If the output indication requires adjustment of more than 10%,the indicated oxygen content of the sample will differ noticeablyfrom the original indication. Repeat steps 2, 3, and 4, using thenew sample oxygen content value as a starting point.The above procedure should achieve the correct sensitivity settingthough a series of sucessive approximations.4-8TELEDYNE ELECTRONIC TECHNOLOGIESAnalytical Instruments