Model 3110 - Teledyne Analytical Instruments

Portable Trace Oxygen AnalyzerInstallation2.4 CalibrationCalibration involves using a span gas to set the span of theinstrument. The proper span gas concentration depends on the range thatthe instrument will be used on. The correct concentration should be 80-90% of the range used. For instance, if the analyzer is to be used on arange of 0-150 ppm oxygen, then a span gas should be prepared with120-135 ppm oxygen in nitrogen.2.4.1 Calibration Procedure for Trace AnalysisTo calibrate the Model 3110, the instrument must be fitted with atrace sensor. The instrument must also be purged overnight using a zerogas (a pure gas with no oxygen, typically O 2 free N 2 ) before calibrating.For A-2C type cells, match the CO2 content in the span gas to that of thesample gas.To calibrate the analyzer for trace analysis:1. Purge the analyzer overnight.2. Purge the calibration gas sample line, regulator, and controlvalve. See Section 2.4.3.3. Set the calibration gas flow rate to 1 SCFH.4. Attach the vent line followed by the span gas line using thequick disconnect fittings.5. Navigate to the SPAN VALUE screen (see Section 3.2.13)and set the span value to the known oxygen concentration inppm of the span gas.6. Observe the oxygen reading on the screen to determine whenthe reading has stabilized.7. Navigate to the SPAN screen and select SPAN: START.8. When the screen changes and displays SPAN: FINISH, selectSPAN: FINISH to set the span.9. Allow the span gas to flow for several minutes to verify theproper span setting.10. Calibration is complete. Remove the span gas line firstfollowed by the vent line.Teledyne Analytical Instruments 21