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Teledyne API Model T201 NH
3
Analyzer Operator Manual Calibration Procedure
07271B DCN6646 19
Table 2-4. NO Calibration Procedure - NO Gas through the SPAN Port
Step No.
Action Comment
1. Press CALS The T201 enters the calibrate mode from sample
mode. The NO gas is supplied through the SPAN inlet
port on the rear panel of the M501 NH
3
.
2 Table 2.3 Follow Steps 2 to 5 in Table 2-3.
Notes
Both the TN
x
and NO
x
channels must be spanned individually with nitric
oxide gas. When you span the NO
x
channel both the NO and NO
x
concentrations must be manually inputted.
It is recommended that the calibration of both the TN
x
and NO
x
channels be done at the same time.
Always confirm that SPAN gas is flowing past the sample or span port
on the rear of the M501 NH
3
converter. There should always be some
excess flow. If insufficient flow is supplied to the analyzer ambient gas
will be entrained and the span values will be incorrect. However, it is
important not to over pressurize the analyzer.
It is a good idea to allow the analyzer to sample span gas for extended
periods following span calibration. Large drifts can signify leaks or
indicate an issue with the span gas source.
If after spanning with nitric oxide, the analyzer slopes are out of range
conduct the following:
- Confirm the gas sources are good. Usually the bottle is certified to a
known level of nitric oxide. The bottle should be balanced with nitrogen.
- Try not to use the same regulator for nitric oxide as was used on
ammonia. This also holds for the tubing between the different bottles
and the mixing source (calibrator).
- Confirm the zero reading is good by delivering Zero gas.
- Confirm that the concentration delivered to the analyzer is equal to
what you entered under the CONC menu NOx and TNx.
- Leak check both the M501 NH
3
and analyzer together.
- Using section 11.6.5 of the T200 manual confirm that the PMT sensor
hardware calibration is set correctly.
2.3 SPANNING THE ANALYZER WITH AMMONIA GAS