Teledyne 306WA - Analog trace oxygen analyzer User Manual

Page 26

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

5-2

5.0 Maintenance &

5.0 Maintenance & T

Trrrrroub

oub

oubleshooting

leshooting

Model 306W

Model 306WA

5.4 Calibration

5.4.1

Internal Calibration

The sensitivity of the unit should be checked at two to four week

intervals. Calibration procedures are described in section 2.4, 4.7.1 and
appendix A4.

5.4.2

Span Gas Calibration

The 306 is designed for accuracy measurement. It has an internal

calibrator. The calibration process is stated in the section that follows, in
section 4.7.1 and in appendix A4.

- Span gas is not required.

- Span gas is an option to calibrate 306 analyzer.

- Span gas should be between 70-90% of the primary (working)
range.

NOTE: Refer to Section 4.3 for calibrator preparation prior calibration.

There are two connection methods that can be utilized for the sample

and span inputs:

Three Way Valve Method

- Install a three-way valve are as follows:

- Connect a common port to the inlet of the analyzer.

- Connect span gas bottle to the normally closed port.

- Connect sample to the normally open port.

- Turn on the sample gas.

- Adjust the flow control inside the analyzer until the flow ball is
inside the target (on the flow tube).

- Purge the analyzer for 12 to 16 hours when the instrument is
being installed for the first time or when replacing the cell.

- Slowly switch the 3-way valve to the span gas.

- Slowly adjust the span gas regulator until span gas flow is about
the same as the sample flow.

- Wait until the reading is stabilized. Adjust span pot so that the
analyzer is reading the same O2 concentration as indication on the
span gas bottle.

- Now the analyzer is calibrated.

- Switch the 3-way valve to sample and the instrument is ready to
go online.