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07271B DCN6646 15
2.0 CALIBRATION PROCEDURE
This section begins with a high-level overview of the calibration procedure
for the T201 analyzer. Details are provided starting in Section 2.1.
First, take the time to read the T200 manual to familiarize yourself with
the Chemiluminescence process. It is important to remember that the
analyzer is merely measuring different levels of nitric oxide sample gas
on three separate channels (TN
x
, NO
x
, NO). The ammonia and nitrogen
dioxide concentrations are then calculated using this information.
Assemble the T201 analyzer according to the pneumatic configurations
outlined in Figure 1-1. Remember: DO N
OT pressurize the sample,
span or zero ports (Zero/SPAN valves are optional) during calibration.
Allow the analyzer to pull the gas through the system using the vacuum
pump.
CAUTION!
If the presence of ozone is detected at any time, call Teledyne API
Customer Service as soon as possible:
800-324-5190 or email: api-customerservice@teledyne.com
Next, zero the analyzer using an approved zero air source, such as,
bottled zero air, nitrogen or zero air generated by a Teledyne-API M701
zero air source. This sets the zero offset for the three individual
channels (TN
x
_OFFS, NO
x
_OFFS, NO_OFFS). Confirm that all
displayed concentrations read zero.
Span the analyzer using bottled nitric oxide gas diluted to a level set to
80% of the expected sample range, preferably using a M702SS
Calibrator. This sets the slope for the three individual channels
(TN
x
_SLOPE, NO
x
_SLOPE, NO_SLOPE). Confirm that displayed
concentrations TN
x
, NO
x
and NO display the correct span concentration.
If you haven’t done so recently, conduct a GPT (gas phase titration)
and confirm the molybdenum is functioning accordingly. Section 8.3.3
of the T200 manual outlines the GPT procedure. Section 6.0 of this
manual consists of a service note for checking the mol
ybdenum
converter. There should be no reason to adjust the molybdenum
efficiency factor on a new analyzer. If a diluted bottled of
nitrogen
dioxide gas is used to determine the molybdenum efficiency, allow
enough time for the span value to stabilize. Nitrogen dioxide exhibits
similar hold up issues as ammonia gas. Therefore, it may take a
number of hours before the NO
x
reading stabilizes.
Span the analyzer using bottled
ammonia gas diluted to a level set to
80% of the expected sample range, preferably using a M702SS Calibrator.
Note
The first time bottled ammonia is connected to the gas dilution system,
regulator/calibrator, the TNx reading may take a number of hours to stabilize.