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TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
9-4
Table 9-1: Test Functions
Test Function
Factory Set-Up
Comment
RANGE
500 PPM
This is the Range of the instrument. In single range mode (standard
configuration) all 3 outputs have the same range. If NO
x
range-2 is
enabled there will be an indication of the range for this output.
Auto range option allows 2 different ranges for instrument output, and
will automatically switch all outputs to the other range dynamically as
concentration values require. The TEST values will show the range
the instrument is currently operating in, and will dynamically display
the alternate range as the range changes occur.
Independent range option allows different ranges for each output.
When enabled, there will be 3 range values displayed. If NO
x
range-2
is enabled there will be an indication of the range for this output
making a total of 4 range indications.
STABIL
Check value in
Final Test Values
Table 2-1
The instrument noise is determined by computing the standard
deviation of the last 10 minutes of data. It is computed using NO
x
channel data when in the NO/NO
x
switching mode or NO
x
only mode.
When in the NO only mode it uses the NO data. The noise value only
becomes meaningful if sampling a constant concentration for more
than 10 minutes. The noise value should be compared to the value
observed in the factory check-out.
Faults that cause high noise values are:
1. Gas leaks
2. Light leak
3.
Faulty HVPS
4.
Defective Preamp board
5.
Outgassing Moly converter
6.
PMT recently exposed to room light
7.
Dirty/contaminated reaction cell
8. Mis-calibrated (slope - offset outside of limits)
SAMPLE FLW
290 cc/min 30
This is the instrument flow. It is computed using the up stream and
down stream pressures across the sample and bypass flow orifices.
This method can give a false flow indication if the orifice is plugged
and the sample pump is creating a pressure drop. It should be taken
into account when diagnosing instrument faults.
- A rTeledyned method of determining if the orifice is plugged is to
disconnect the sample, bypass or ozone tubes upstream of their
respective locations, then briefly put your finger over the fitting. You
should feel the vacuum build up. The bypass flow should be 250
cc/min, the ozone 250 cc/min, and sample flow of 50 cc/min.
- Another reliable method is to attach a rotameter or soap bubble
flowmeter to the fittings to measure the flow.
Flow rate will change a few cc/min due to changes in ambient air
pressure such as cycling of air conditioning, or passing weather
fronts. Changing altitude changes the ambient air pressure and
therefore the sample flowrate. This effect is about 15-20 cc/min per
1000 feet of altitude change. If required, the output of the instrument
can be compensated for pressure. See Section 5.3.9,
Table 9-5
.
(table continued)
Содержание 9110AH
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