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Model 9110T NOx Analyzer Troubleshooting & Service
Teledyne Analytical Instruments 317
QUESTION ANSWER
Can I use the IZS option to
calibrate the analyzer?
Yes. However, the accuracy of the IZS option’s permeation tube is only
±5%. Whereas this may be acceptable for basic calibration checks, the IZS
option is not permitted as a calibration source in applications following US
EPA protocols.
To achieve highest accuracy, it is recommended to use cylinders of
calibrated span gases in combination with a zero air source.
How do I measure the sample
flow?
Sample flow is measured by attaching a calibrated flow meter to the sample
inlet port when the instrument is operating. The sample flow should be 500
cm³/min 10%.
Section 13.3.12.3 includes detailed instructions on performing a check of
the sample gas flow.
Can I use the DAS system in
place of a strip chart recorder or
data logger?
Yes. Section 7 describes the setup and operation of the DAS system in
detail.
How often do I need to change
the particulate filter?
Once per week or as needed. Section 11 contains a maintenance schedule
listing the most important, regular maintenance tasks. Highly polluted
sample air may require more frequent changes.
How long does the sample pump
last?
The sample pump should last one to two years and the pump head should
be replaced when necessary. Use the RCEL pressure indicator on the front
panel to see if the pump needs replacement.
If this value goes above 10 in-Hg-A, on average, the pump head needs to
be rebuilt.
Why does my RS-232 serial
connection not work?
There are several possible reasons:
The wrong cable: please use the provided or a generic “straight-
through” cable (do not use a “null-modem” type cable) and ensure the
pin assignments are correct (Sections 3.3.1.8 and 6.3).
The DCE/DTE switch on the back of the analyzer is not set properly;
ensure that both green and red lights are on (Section 6.1).
The baud rate of the analyzer’s COMM port does not match that of the
serial port of your computer/data logger (Section 6.2.2).
How do I make the instrument’s
display and my data logger
agree?
This most commonly occurs when an independent metering device is used
besides the data logger/recorder to determine gas concentration levels
while calibrating the analyzer. These disagreements result from the
analyzer, the metering device and the data logger having slightly different
ground levels.
Use the data logger itself as the metering device during calibration
procedures.