Teledyne M201E manual Generate a known, TNx CONV, Exit, Press EXIT, EXIT

Calibration Procedure Teledyne API Model M201E NH3 Analyzer Operator Manual

Table 2-6. NH3 Calibration Procedure – NH3 Gas Through The SAMPLE Port

Step No.	Action	Comment
1.	Generate a known	Monitor the TNx concentration until it has stabilized;
	level of NH3 gas	this signifies that both the NOx and NH3 gases have
	using a calibration	stabilized. This could range from 20 minutes to
	gas source	several hours depending on whether the analyzer /
		calibration system has recently been subjected to
		ammonia gas.
2.	NH3 Conversion	When the TNx channel is stable, note the
	efficiency	concentration of NH3 displayed. The calculation for
	calculation	the NH3 Conversion efficiency is:
		(Displayed NH3 concentration) divided by
		(Delivered NH3 concentration)
		Example: The operator is delivering 450 PPB of NH3.
		The displayed concentration for NH3 is 440 PPB then
		the efficiency factor = 440/450 = 0.9777
3.	Press CAL	The M201E enters the calibrate mode from Sample
		mode.
4.	Channel Selection	Press TNX then Press ENTR.
5.	Range Selection	Press LOW range then Press ENTR.
6.	Press CONC	Since TNx was chosen previously, then the following
		will be displayed:
		TNx CONV	Exit
		Press CONV enter 0.9777, Press ENTR
		Press EXIT, EXIT

∙Note: In the example outlined above, the displayed ammonia concentration is being increased by 2.27%. Newer M501 NH3, converters should have efficiency values very close to 1.00. Depending on the operator’s acceptable level of error, it may not be necessary to change the efficiency factor from 1.00. Therefore, calibration with nitric oxide gas is all that is required.

∙The efficiency factor may also be changed by entering the VARS MENU and editing NH3_CE_FACTOR1 = 1.0000.

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