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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Teledyne M201E manual NH3 Calibration Procedure NH3 Gas Through The Sample Port

M201E specifications

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