Teledyne manual The M201E enters the calibrate mode from sample

Teledyne API Model M201E NH3 Analyzer Operator Manual Calibration Procedure

Table 2-4. NO Calibration Procedure - NO Gas through the SPAN Port

Step No.	Action	Comment
1.	Press CALS	The M201E enters the calibrate mode from sample
		mode. The NO gas is supplied through the SPAN inlet
		port on the rear panel of the M501 NH3,.
2	Table 2.3	Follow Steps 2 to 5 in Table 2-3.
Notes:

∙Both the TNx and NOx channels must be spanned individually with nitric oxide gas. When you span the NOx channel both the NO and NOx concentrations must be manually inputted.

∙It is recommended that the calibration of both the TNx and NOx 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 NH3, 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 NH3, and analyzer together.

Using section 11.6.5 of the M200E manual confirm that the PMT sensor hardware calibration is set correctly.

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