083730300A DCN8101 Maintenance and Service 141
5.9 FREQUENTLY ASKED QUESTIONS
The following is a list from the Teledyne API’s Technical Support Department of the
most commonly asked questions relating to the T300/T300M CO Analyzer.
Why does the ENTR button
sometimes disappear on the Front
Panel Display?
During certain types of adjustments or configuration operations, the
ENTR button will disappear if you select a setting that is out of the
allowable range for that parameter (such as trying to set the 24-hour
clock to 25:00:00, or selecting a DAS hold off period of more than 20
minutes).
Once you adjust the setting in question to an allowable value, the ENTR
button will re-appear.
Why is the ZERO or SPAN button
not displayed during calibration?
This happens when the measured gas concentration differs significantly
from the span or zero gas concentration value entered by the user. This
prevents accidental recalibration of the analyzer to an out-of-range
response curve.
EXAMPLE: The span set point is 40 ppm but gas concentration being
measured is only 5 ppm.
For more information, see Sections 5.7.10.3 and 5.7.10.4.
How do I enter or change the value
of my Span Gas?
See Section 4.2.1.2.
Why does the analyzer not
respond to span gas?
There could be something wrong with a span gas tank, or a span gas
concentration was entered incorrectly, or there could be a pneumatic
leak. Section 5.7.10.3 addresses these issues.
Is there an optional midpoint
calibration?
There is an optional mid-point linearity adjustment; however, midpoint
adjustment is applicable only to applications where CO measurements
are expected above 100 ppm.
Call Teledyne API’s Technical Support Department for more information
on this topic.
What do I do if the concentration
displayed does not match the
value recorded or displayed on my
data logger even if both
instruments are calibrated?
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.
How do I perform a leak check? Section 5.6.3 provides leak check instructions.
How do I measure the sample
flow?
Sample flow is measured by attaching a calibrated rotameter, wet test
meter, or other flow-measuring device to the sample inlet port when the
instrument is operating. The sample flow should be 800 cm
3
/min ±10%.
See Section 5.6.4.
How long does the IR source last? Typical lifetime is about 2-3 years.
Can I automate the calibration of
my analyzer?
Any analyzer with zero/span valve or IZS option can be automatically
calibrated using the instrument’s AutoCal feature (Section 4.3).
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