Teledyne 201A User Manual

MANUAL ADDENDUM

MODEL 201A

AMMONIA ANALYZER

TELEDYNE ADVANCED POLLUTION INSTRUMENTATION

Copyright 2005 T-API Inc.

(T-API)

9480 CARROLL PARK DRIVE

SAN DIEGO, CA 92121-5201

TOLL-FREE: 800-324-5190

FAX: [phone]

TEL: [phone]

E-MAIL: [e-mail]

WEB SITE:

12 September, 2005

www.teledyne-api.com

04689

REV. B1

Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

SAFETY MESSAGES

Your safety and the safety of others is very important. We have provided many important safety
messages in this manual. Please read these messages carefully.

A safety message alerts you to potential hazards that could hurt you or others. Each safety
message is associated with a safety alert symbol. These symbols are found in the manual and
inside the instrument. The definition of these symbols is described below:

GENERAL WARNING/CAUTION: Refer to the instructions for details on
the specific danger.

CAUTION: Hot Surface Warning

CAUTION: Electrical Shock Hazard

Technician Symbol: All operations marked with this symbol are to be
performed by qualified maintenance personnel only.

Electrical Ground: This symbol inside the instrument marks the central
safety grounding point for the instrument.

CAUTION

The analyzer should only be used for the purpose

and in the manner described in this manual.

If you use the analyzer in a manner other than that for which

it was intended, unpredictable behavior could ensue with

possible hazardous consequences.

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Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

TABLE OF CONTENTS

SAFETY MESSAGES .......................................................................................................1

TABLE OF CONTENTS...................................................................................................2

1 .0 M201A AMMONIA ANALYZER............................................................................6

1.1 PRINCIPLE OF OPERATION................................................................................................... 6

1.1.1 Special Considerations for Ammonia Measurement.................................................. 7

1.1.2 Sample Filtration........................................................................................................ 8

1.2 M201A ANALYZER SPECIFICATIONS..................................................................................... 9

2 .0 CALIBRATION PROCEDURE..............................................................................10

2.1 ZERO/SPAN CALIBRATION – BASIC INSTRUMENT.................................................................. 10

2.1.1 Zero/Span Calibration with Z/S Valves or ECO Option............................................ 13

2.1.2 TN/TNx Channel Calibration Quality........................................................................ 15

2.1.3 NH3 Calibration....................................................................................................... 16

2.1.4 Channel Calibration Quality..................................................................................... 17

3 .0 MAINTENANCE SCHEDULE...............................................................................18

3.1 M201A MAINTENANCE SCHEDULE ..................................................................................... 18

3.2 MAINTAINING THE M501NH CONVERTER............................................................................ 18

3.3 AUTOZERO FLOW CHECK.................................................................................................. 20

4 .0 M201A SPARE PARTS LIST..................................................................................28

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Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

LIST OF FIGURES

FIGURE 1 - M201A AMMONIA ANALYZER – BLOCK DIAGRAM ................................................................. 21

FIGURE 2 - M201A EXTERNAL PNEUMATIC CONNECTION DIAGRAM WITH ECO (EXTERNAL CALIBRATOR

OPTION)............................................................................................................................................. 22

FIGURE 3 - M201A PNEUMATIC DIAGRAM BASIC...................................................................................... 23

FIGURE 4 - M201A PNEUMATIC DIAGRAM Z/S OPTION............................................................................. 24

FIGURE 5 - M201A PNEUMATIC DIAGRAM EXTERNAL CALIBRATOR OPTION (ECO) ................................ 25

FIGURE 6 – M501NH CONVERTER CARTRIDGE ......................................................................................... 26

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Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

LIST OF TABLES

TABLE 2.1 - ZERO CALIBRATION PROCEDURE - ZERO GAS THROUGH THE SAMPLE PORT ......................... 11

TABLE 2.2 - ENTER THE EXPECTED SPAN GAS CONCENTRATIONS PROCEDURE......................................... 11

TABLE 2.3 - SPAN CALIBRATION PROCEDURE - SPAN GAS THRU SAMPLE PORT ........................................ 12

TABLE 2.4 - ZERO CALIBRATION PROCEDURE - ZERO GAS FROM REAR PANEL ZERO AIR INLET................. 13

TABLE 2.5 - ENTER THE EXPECTED SPAN GAS CONCENTRATIONS PROCEDURE......................................... 14

TABLE 2.6 - CALS - SPAN CAL PROCEDURE - GAS FROM REAR PANEL SPAN GAS INLET............................ 15

TABLE 3.1: PREVENTATIVE MAINTENANCE SCHEDULE............................................................................. 18

TABLE 3.2 – M501NH CONVERTER REBUILD PARTS LIST......................................................................... 19

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Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

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Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

1.0 M201A AMMONIA ANALYZER

This manual is to be used in conjunction with the M200A NOx Analyzer manual p/n
02246 supplied with this instrument.

The M201A Ammonia Analyzer consists of a modified M200A Nitrogen Oxides Analyzer
and M501NH Ammonia Converter:

A functional block diagram of the system is shown in Figure 1.
The instrument comes in three pneumatic configurations:

• The basic system is shown in Figure 3;

• The M201A with Z/S valves is shown in Figure 4;

• The M201A with External Calibrator Option (ECO) is shown in Figure 5.

Figure 2 can be used to connect the M201A system for installation. Please note that for a
M201A with either a Zero/Span or ECO option, you must connect the umbilical cord,
02255, between the analyzer and the converter assembly.

1.1 Principle of Operation

The Teledyne API Model 201A Analyzer measures ammonia by converting NH3 to nitric
oxide by the following reaction:

4NH
The resulting NO is then measured by the chemiluminescent reaction of NO with ozone.

Consult Section 4.1 in the M200A manual (provided with this instrument) for more
details on NO measurement.

A molybdenum converter is continuously in the pneumatic pathway, providing the TN
channel signal. The
converters are in series, creating the TNx signal.

The ammonia concentration is computed by the difference between the TNx and TN
channels, as shown in the following equation:

NH
See the pneumatic diagram in Figure 1.

+ 5O2 → 4NO + 6H2O

3

M501NH ammonia converter is periodically switched so both

→ TNx - TN

3

The actual formula for computation of ammonia concentration is more complicated than
the above equation, as it includes converter efficiencies, plus sample temperature and
pressure. The difficulty in ammonia measurement is that the molybdenum converter

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Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

converts some of the ammonia to NO, thus the TN channel data contains a small
ammonia signal. Secondly, the ammonia converter does not convert all of the ammonia
or ambient NO2 to NO. Finally, the high temperature in the ammonia converter causes
the oxygen and nitrogen in ambient air to react, creating a background of NOx which
needs to be factored into computing the result. Fortunately, all of the above
shortcomings have been overcome in the M201A by careful calibration, and calculation
of the result. .

Periodically, the AutoZero valve switches allowing the analyzer to read zero
background. The AutoZero readings are subtracted from all of the other readings. This
improves zero baseline stability.

As with many chemical reactions the conversion of ammonia in the presence of other
oxides of nitrogen is complicated.

In the molybdenum converter operating at 315

o

C, the following significant reactions are

taking place:

Mo + NO

+ Mo + O2 → MoO3 + NO <10% Eff

NH

3

→ MoO3 + NO ~100% Eff

2

Notice in the second reaction some of the ammonia is converted to NO by the
molybdenum metal.

The M501NH NH3 Converter operates at 825

o

C. At this high temperature, several

reactions occur:
NO → NO Efficiency = ~100 %

NOx → NO Efficiency = ~85%
NH3 → NO Efficiency = ~85%
N2 + O2 → NO Efficiency = <1%

As can be seen from the above reactions, the calculation of the ammonia concentration
and overall calibration of the instrument must be done carefully if accurate ammonia
concentrations are to be measured. The calibration procedure is covered in Section 2.

1.1.1 Special Considerations for Ammonia Measurement

Ammonia is a difficult gas to measure due to its chemical characteristics. Because of
its large dipole moment, the gas tends to adsorb on surfaces and diffuse into many
materials. The following precautions should be observed when designing an ammonia
sampling system and connecting the M201A analyzer to the system:

Materials:
Do NOT use TEFLON tubing or fittings in contact with NH3 sample or span gas.

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Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

Do NOT use copper tubing or fittings designed for household plumbing.

Use ONLY Chromatography grade (cleaned, passivated) stainless steel tubing
Use ONLY Glass tubing for sample inlet manifold.

These rules apply also to your calibrator’s internal plumbing. Verify that the calibrator
pneumatic pathway that contacts ammonia only uses stainless steel or glass tubing.

The M702SS calibrator supplied with the External Calibration Option is built with
stainless steel fittings and tubing for all internal plumbing wetted by NH3.

Typical ambient NH3 levels are < 15 ppb, unless there is some large source of
ammonia nearby, so the sampling and analysis system must be carefully designed and
well maintained.

1.1.2 Sample Filtration

The M201A does not come with a sample filter installed. Depending on the options
ordered, a sample filter may be separately packaged with the instrument. If the filter is
installed, the instrument response time is significantly increased, due to its large surface
area. Also, the condition of the filter (particulate loading and type) can adversely affect
the response time.

For minimum response time operation, the instrument should be supplied with clean
sample gas at ambient pressure.

If the sample filter is not included, the only additional filter in the M201A pneumatic
pathway is a ¼” dia stainless steel sintered filter used to protect the flow control orifice
from plugging. This filter will plug rapidly if the sample gas is not filtered before entering
the analyzer. Some means of filtering the sample gas, such as an external stainless
steel filter should be added upstream of the analyzer.

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Teledyne API Model 201A NH3 Analyzer Instruction Manual, 04689, Rev. B1

1.2 M201A Analyzer Specifications

Ranges 0-50 to 0-2000 ppb in 1 ppb increments

Range Modes Single, Independent, AutoRange

Noise at Zero

Noise at Span

Lower Detectable Limit 1 ppb RMS

Zero Drift

Span Drift < 1.0% FS Range / 7 days

Lag Time 40 sec

Rise Time 90% 120 sec

Fall Time 90% 120 sec

Sample Flow Rate 1000 cc/min

Linearity 2% of full scale

Precision 1.0% of reading

Temp Range 10-30oC

Dimensions HxWxD 7” x 17” x 23.6” (18cm x 43cm x 61cm)

Weight, Analyzer 43 lbs (20 kg)

Weight, Converter 24 lbs (11 kg)

Weight, Pump 16 lbs (7 kg)

Power, Analyzer 100V ~50/60 Hz, 120V ~60 Hz, 220V ~50Hz, 240V ~50 Hz,

Power, Analyzer

Power, Pump 110V ~60 Hz, 220V ~50 Hz, 240V ~50 Hz, 295 watts

Power, Pump CEMark5230 V ~50 Hz, 2.5 A peak

Environmental Installation Category Pollution Degree 2, Over-voltage

Analog Output 0-100, 0-1, 0-5, 0-10VDC bi-polar, 4-20mA isolated

Analog Resolution 1 part in 2048

Status Option 12 Status Outputs

Measurement Units ppb, ug/m3

1

1

3

0.5 ppb RMS
< 1.0% of reading above 50 ppb

2 ppb / 24 hours

125 watts

5

230V ~50 Hz, 125 watts

Category II

1. As defined by USEPA

2. Defined as twice the zero noise level

3. At constant temperature and voltage

4. Bi-polar

5. Electrical rating for CE Mark Compliance

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