Teledyne M201E Manuel d'utilisateur télécharger pdf (Page 13)

Teledyne API Model M201E NH

Analyzer Operator Manual M201E Ammonia Analyzer

05206H DCN5910 11

and registered as NO

. This location provides the drier with continuous flow,

thereby allowing it to stabilize faster.

Note: Due to the Nafion® drier, the analyzer has a maximum ammonia range of

2.0 PPM.

The calculated gas concentrations, ammonia and nitrogen dioxide, are computed

from the differences between the measured channels, as outlined in the following

equations:

NO (Nitric Oxide) Concentration = Measured

(Total Nitrogen) Concentration = Measured (NH

+ N0

+ NO)

(Total Nitrogen – Ammonia) Concentration = Measured (NO

+ NO)

(Ammonia) Concentration = Calculated as follows:

[(TNx - NOx) / (NH

_CE_FACTOR1)]

(Nitrogen Dioxide) Concentration = Calculated as follows:

[(NOx – NO) / (NO

_CE_FACTOR1)]

Note: The

nitrogen dioxide efficiency factor (NO

_CE_FACTOR1) must be

calculated by conducting a GPT (gas phase titration) as described in Section

8.3.3 of the M200E manual and Section 7.0 of this manual. This value gives a

good indication of how well the molybdenum is converting nitrogen dioxide into

nitric oxide. In a properly functioning analyzer the value should be close to 1.0. It

is recommended that the molybdenum efficiency be checked every three months.

The ammonia converter efficiency factor (NH

_CE_FACTOR1) is discussed in

more detail in Section 2.3 of this manual. The conversion efficiency of the M501

, should be checked prior to starting long term tests. Both efficiency factors

can be accessed through the analyzer VARS MENU.

The actual formula for computation of the gas concentrations is more

complicated than the above equations, as it includes sample, reaction cell

pressure changes and averaging the PMT signal. Then the zero offset and

slopes are applied to the separate channels (TN

, NO

, NO) to determine the

concentrations. Concentration compensation occurs while the variable

TP_FACTOR under the VARS MENU is switched ON. Otherwise the displayed

concentration is uncompensated. It is recommended that the variable

TP_FACTOR remain on at all times.

1.1.1 Minimizing PMT Drift

In order to account for PMT drift in the analyzer, the AutoZero valve switches

once a minute allowing the analyzer to read zero background. The AutoZero

valve directs the sample gas stream to completely bypass the reaction cell, while

simultaneously filling the reaction cell with Ozone for dark noise measurement.

This is then subtracted as a measurement offset from the raw PMT concentration

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Teledyne M201E Manuel d'utilisateur Page 13

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