Portable Oxygen Analyzer
Installation
Teledyne Analytical Instruments
11
Chapter 3 to understand how to operate the instrument
before proceeding with the calibration step.
To calibrate the instrument using ambient air as a span gas:
1.
If not already powered up, press the ENTER key to turn the
instrument on.
2.
Set the filter to 1 or 2 on the filter screen.
3.
Navigate to the
SPAN VALUE
screen and set the span to
20.9%. See Section 3.2.6.
4.
Select the
SPAN
screen.
5.
Install the vent and sample in lines in that order.
6.
Remove the cell holder cap on the bottom of the instrument.
This exposes the cell to air for calibration.
7.
Replace the cell holder cap after a few seconds and observe
the oxygen reading on the SPAN screen.
8.
When the reading appears stable, select
SPAN: START
, then
press ENTER.
9.
When t
he screen ch
anges
to SPAN: FINISH
, select
SPAN:
FINISH
.
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.
