Teledyne 3110 – Portable Trace/Percent Oxygen Analyzer, FM-approved configuration - Manual (Page 20)

Installation Model 3110
Teledyne Analytical Instruments 12
10. Expose the cell holder to air again by removing the cell
holder cap for a few seconds. Verify that the oxygen reading
is 20.9%.
Once the cell holder cap is sealed, the sensor will slowly consume
the trapped oxygen. You should notice that the on-screen oxygen
reading should slowly decrease as the oxygen is consumed.
The instrument is now calibrated and you can remove the sample-in
line and the vent line in that order.
2.4.2 Calibration Procedure for Trace Analysis
To calibrate the Model 3110 for trace oxygen measurements, the
instrument must be fitted with a trace sensor. The instrument must also
be purged overnight using a zero gas (a pure gas with no oxygen,
typically O
2
free N
2
) before calibrating.
To calibrate the analyzer for trace analysis:
1. Purge the analyzer overnight.
2. Purge the calibration gas sample line, regulator, and control
valve. See Section 2.4.3.
3. Set the calibration gas flowrate to 1 SCFH.
4. Attach the vent line followed by the span gas line using the
quick disconnect fittings.
5. Navigate to the SPAN VALUE screen (see Section 3.2.6)
and set the span value to the known oxygen concentration in
ppm of the span gas.
6. Observe the oxygen reading on the screen to determine when
the reading has stabilized.
7. Navigate to the SPAN screen and select SPAN: START.
8. When the screen changes and displays SPAN: FINISH, select
SPAN: FINISH to set the span.
9. Allow the span gas to flow for several minutes to verify the
proper span setting.
10. Calibration is complete. Remove the span gas line first
followed by the vent line.
2.4.3 Bleeding the Regulator and Purging the Gas Line
When using bottled gas (gas cylinder) as a calibration gas for trace
analysis applications, the regulator and sample lines should be purged to