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05206H DCN5910 15
2.0 CALIBRATION PROCEDURE
This section begins with a high-level overview of the calibration procedure for the
M201E analyzer. Details are provided starting in Section 2.1:
First, take the time to read the M200E 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 M201E analyzer according to the pneumatic configurations
outlined in Figure 1-1. Remember: DO NOT 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 M702 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
M200E manual outlines the GPT procedure. Section 7.0 of this manual
consists of a service note for checking the molybdenum 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 M702 Calibrator. Note: