Frequently Asked Questions - Teledyne T400 User Manual

5.8

FREQUENTLY ASKED QUESTIONS

The following is a list from the Teledyne API's Technical Support Department of the
most commonly asked questions relating to this analyzer.
QUESTION
Why is the ZERO or SPAN button
not displayed during calibration?
How do I enter or change the value
of my Span Gas?
Why does the analyzer not
respond to span gas?
Is there an optional midpoint
calibration?
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?
How do I perform a leak check?
How do I measure the sample
flow?
How long does the IR source last?
Can I automate the calibration of
my analyzer?
Can I use the IZS option to
calibrate the analyzer?
083730400A DCN8130
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 5.7.6.3 and 5.7.6.4.
See Section 4.2.1.2.
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 5.7.6.3 addresses these issues.
Midpoint calibration checks can be performed using the instrument's
AutoCal feature. The IZS option is required in order to perform a mid-
point span check.
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.
Section 5.6.3 provides leak check instructions.
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
See Section 5.6.6.
Typical lifetime is about 2-3 years.
Any analyzer with zero/span valve or IZS option can be automatically
calibrated using the instrument's AutoCal feature (Section 4.3).
Yes. However, whereas this may be acceptable for basic calibration
checks, the IZS option is not as accurate as the external span and zero
gas bottles.
To achieve highest accuracy, it is recommended to use cylinders of
calibrated span gases in combination with a zero air source.
Teledyne API – Model T400 O
ANSWER
Analyzer
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/min ±10%.
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