Teledyne 9700 instruction manual Span Gas, Analyzer Startup, Sample System Startup

Flue Gas Analysis System Operation 4

4.2.2Span Gas

It is recommended that the span gas have a concentration of 4.0–4.8% methane or other desired combustible gas with the balance being nitrogen.

Note: It is important that the dilution air flow is never turned off during operation or calibration. Combustibles without at least a 2 : 1 ratio of oxygen should never be allowed to flow past the sensor. If this occurs, a loss of sensitivity will result and the unit will require complete recalibration and possible sensor replacement.

Note: The range of the combustible monitor is 0–5% combustibles, however, it is actually operating, at a sensitivitv of 0–2.5% combus- tibles (methane equivalvent) due to the 1 : 1 dilution with air.

4. 3 System Startup

4.3.1Analyzer Startup

Refer to Sections 4.1 and 4.2 for startup procedures for the oxygen and combustibles analyzers, respectively.

4.3.2Sample System Startup

Start the pump by turning ON the oxygen analyzer RANGE switch. Then turn on the water by opening the shutoff valve inside the case. Water should be observed passing through the transparent plastic hoses. Water flow rate will be determined by the supply pressure. With 10 psig, flow rate will be approximately 1/4 gpm maximum pressure should be 100 psig. This will give a flow rate of about 11/2 gpm. Generally, the dirtier the sample, the more water required. However, a 1/4 gpm flow rate will nor- mally be adequate, and the pressure should be reduced accordingly.

After analyzer startup and calibration procedures have been accom- plished, make certain that the sample-calibration selector valve is in the proper position to draw in the sample (see the cautionary note in step (2) of Section 4.1.4, Initial Calibration and Equilibration, and step (5)).

TELEDYNE BROWN ENGINEERING 4-7

Analytical Instruments