Teledyne API Model 200A NOX Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
If an ammonia permeation tube is being used, substitute the molecular weight of NH3 (17
g/mole) for that of NO2.
The temperature is set at 50.0o C. Check SETUP-MORE-VARS and scroll to the IZS-SET
variable to verify that the temperature is properly set. It should be set to 50o C with over-and-
under temperature warnings set at 49o C and 51o C. There is a 60 cc/min flow across the
permeation tube at all times to prevent build-up of NO2 gas in the tubing.
If desired, the output of the permeation tube can be adjusted by adjusting the oven temperature
up or down slightly. The adjust increment is 0.1o C to facilitate small adjustments of the setpoint
temperature.
WARNING
Do not leave instrument turned off for more than 8 hours
without removing the permeation tube. Do not ship the
instrument without removing the permeation tube. The
tube continues to emit NO2, even at room temperature
and will contaminate the entire instrument.
6-6
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