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Teledyne API – Ultra Sensitivity Model T200UP NO/NO
Note
4.1.2
16
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EPA Protocol Calibration section. This sets the NO and NOx slopes
for each channel.
5. Note, a hardware adjustment of the PMT may be required, by
adjusting the HVPS, in order to get the NO & NOx slopes to be close
to 1.000. Refer to PMT Sensor Hardware Calibration in the
Troubleshooting and Repair section of the T200 Operation Manual.
6. Calibrate the photolytic converter efficiencies at 10-20% and 80-90%
of the expected NO
using either bottled NO
level GPT using a T700U calibrator.
The photolytic converter dissociates the NO
free radical oyxgen atoms combine with ambient O
excess NO used during GPT will react with the byproduct O
turn affects the calculated NO
the amount of excess NO should be kept to a minimum.
The Ozone generated as part of the photolytic process back titrates the
converted NO. This phenonemnon is non-linear and leads to a situation
where the calculated CE value is less at higher concentrations of NO
Example:
At 50 PPB of NO
At 400 PPB of NO
The software allows calibration of the CE value at two NO
points, A and B. Thereafter, the software corrects the measured NO
concentration based on a calculated slope and offset. Concentration
values entered for the B parameter are higher than those entered for A.
Therefore, it is recommended that the user calibrate the B point first, so
that the higher concentration of NO
tubing.
Converter Efficiency (CE) Points (A&B) Calibration
High Value NO
1. Deliver 80-90% of selected range for NO
NO at or below 20ppb), and allow the analyzer to sample for an
adequate period to achieve stability and display the measured NOx,
NO and NO
2. Enter the actual NO
menu of the CAL>CONC>CONV menu, and press ENTR. The actual
NO
concentration, if using GPT to generate the gas, is equal to the
2
difference between the NO being delivered and the measured NO
remaining as part of the GPT.
3. Exit to the SETUP menu and allow the analyzer to sample for an
adequate period to achieve stability.
/NOx Analyzer
2
range (details provided next in Section 4.1.2)
2
balanced in nitrogen or by conducting a low
2
concentration. If calibrating using GPT
2
the CE value is Typically CE = 28/50 = 0.5600
2
the CE value is CE = 200/400 = 0.5000
2
helps to stabilize the pneumatic
2
concentration, Point B:
2
concentrations.
2
concentration being delivered into the NO2B
2
Addendum to T200
Molecule into NO + O. The
2
to form O
. The
2
3
, which in
3
2
concentration
2
(if using GPT, keep excess
2
07450B DCN6495
.
2
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