Installation and Start-Up | 3-41
4. Record the analyzer’s initial Measure and Reference PMT signal read-
ings. See “Recording Initial Readings” in this chapter.
5. Change the Flow Control mode back to “0” (Analyzer Control).
6. Return to RUN mode.
7. Turn off the Zero gas.
The Zero is complete and the analyzer is now on-line.
Setting the Zero Gas Flow Rate
When the flow control solenoid is in a de-energized state, instrument
air flows into the sample path via a flow controlling rotameter and a
Manifold. The Zero gas flow rate must be high enough to adequately
purge the Measuring Cell of sample gas to obtain a “good zero.” A good
zero can be defined as a state where the concentration outputs of the ana-
lyzer are stable and further increases in Zero gas flow rate do not reduce
the concentrations observed on the analyzer User Interface. A nominal
flow rate of 5–10 SCFH should be sufficient for this purpose.
Set the response time first to ensure a good zero.
Some applications may require a higher flow rate.
Setting the Sample Gas Flow Rate and Sample
Response Time
The Aspirator Drive Air Regulator is used to control the sample flow
through the system. A typical sample flow rate is in the range of
3.0–5.0 L/minute (0.1–0.2 SCFM) and can be achieved by adjusting the
Aspirator Pressure Gauge to approximately 10 PSI above the sample
stream pressure.
To avoid damaging the pressure transducer, do not set the pressure
higher than 105 KPAG (15 PSIG).
The sample response time may vary, depending on Sample Line
length.
!
CAUTION
NOTE
(FlowCtrl) CALF5 0
Del 0 Ent Ent
NOTE
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