YOKOGAWA IR400 series User manual

User’s
Manual
R
Model IR400
Infrared Gas Analyzer
IM 11G02N01-01E
IM 11G02N01-01E
5th Edition

i
IM 11G02N01-01E
<Introduction>
PREFACE
We are grateful for your purchase of Yokogawa’s Infrared Gas Analyzer, Model: IR400.
• First read this instruction manual carefully until an adequate understanding is acquired, and
then proceed to installation, operation and maintenance of the analyzer. Wrong handling may
cause an accident or injury.
• The specications of this analyzer are subject to change without prior notice for further product
improvement.
• Modication of this analyzer is strictly prohibited unless a written approval is obtained from
the manufacturer. Yokogawa will not bear any responsibility for a trouble caused by such
a modication.
• This instruction manual shall be stored by the person who actually uses the analyzer.
• After reading the manual, be sure to store it at a place easier to access.
• This instruction manual should be delivered to the end user without fail.
The related documents are as follows.
General Specications: GS 11G02N01-01E
User’s Manual: IM 11G02N01-01E (this manual)
IM 11G02P01-01E Communication Functions (MODBUS)
IM 11G00E01-01EN ZX8D Zirconia Oxygen Analyzer
The “E” or “EN” in the document number is the language code.
Manufacturer: Yokogawa Electric Corporation
Type: Described in Yokogawa’s company nameplate on main frame
Date of manufacture: Described in Yokogawa’s company nameplate on main frame
Product nationality: Japan
Request
• It is prohibited to transfer part or all of this manual without
Yokogawa’s permission in written format.
• Description in this manual is subject to change without prior
notice for further improvement.
Media No.IM 11G02N01-01E 5th Edition :Feb. 2016 (YK)
All Rights Reserved Copyright © 2002, Yokogawa Electric Corporation
Request

ii
IM 11G02N01-01E
<Introduction>
CAUTION ON SAFETY
First of all, read this “Caution on safety” carefully, and then use the analyzer in the correct
way.
• The cautionary descriptions listed here contain important information about safety, so they
should always be observed. Those safety precautions are ranked in 3 levels, “DANGER”,
“CAUTION” and “PROHIBITION”.
DANGER
Improper handling may cause dangerous situations that may
result in death or serious injury.
CAUTION
Improper handling may cause dangerous situations that may
result in medium-level troubles, minor injury, or property
damage.
PROHIBITION
Items which must not be done are noted.
Caution on installation and transport of gas analyzer
DANGER
• The unit is not of explosion-proof specications.
Do not use it in an atmosphere of explosive gases.
Otherwise serious accidents such as explosion or re may
result.
CAUTION
• Install the analyzer, observing the rules provided in this
manual, in a place that endures the weight of the analyzer.
Installation in an inadequate place may cause turnover or fall,
resulting in injury.
• Be sure to wear protective gloves when lifting the analyzer.
Lifting it with bare hands may result in injury.
• Be sure to x the casing before transporting the analyzer.
Transportation in unstable state may result in injury.
• The gas analyzer is heavy. Two or more persons should carry
it, while exercising due care. Otherwise unexpected harm to
your body or injury may result.
• Take care not to let cable chips and other foreign objects
enter the unit during installation work. Otherwise re, failure,
or malfunction may result..

iii
IM 11G02N01-01E
<Introduction>
Caution on piping
DANGER
Be sure to observe the following precautions while install-
ing piping. Improper piping may result in gas leakage.
If the leaking gas contains a toxic component, serious ac-
cidents may result. If it contains combustible gases, explo-
sion or re may result.
• Connect pipes correctly referring to the instruction manual.
• Discharge the exhaust gas outdoors to prevent it from
remaining within the sampling device or indoors.
• Relieve the exhaust gas from the analyzer to the atmospheric
pressure to prevent buildup of undesirable pressure to the
analyzer. Otherwise piping within the analyzer may be
disconnected, resulting in gas leakage.
• Use pipes and pressure reducing valves to which no oil/
grease is attached for piping. Otherwise, re may result.
Caution on wiring
CAUTION
• Be sure to turn off the power before installing wiring.
Otherwise electric shock may result.
• Be sure to perform class D grounding work. Otherwise,
electric shock or failure may result.
• Select a proper wiring material that satises the ratings of the
instrument. Otherwise, electric shock or re may result.
• Be sure to connect a power supply of correct rating.
Otherwise, re may result..
Caution on use
DANGER
• Be sure to read the instruction manual for reference gases
before handling reference gases such as calibration gas to
use them properly.
CAUTION
• Leaving the analyzer unused for a long time or restarting it
after long-term suspension requires procedures different from
normal operation or suspension procedures. Be sure to follow
the instructions in each instruction manual.
Otherwise, intended performance may not be achieved, or
accidents or injury may result.
• Do not operate the analyzer for a long time with its door left
open. Otherwise, dust, foreign matter, etc. may stick on
internal walls, thereby causing faults.
PROHIBITION
• Do not touch the input/output terminals with metal or nger.
Otherwise, electric shock or injury may result.
• Do not smoke or use ames near the analyzer. Otherwise, re
may result.
• Do not allow water to enter the analyzer. Otherwise, electric
shock or internal re may result.

iv
IM 11G02N01-01E
<Introduction>
Caution on maintenance and check
DANGER
• Before performing work with the cover of the analyzer kept
open for maintenance and check, be sure to purge completely
not only within the analyzer but also measuring gas lines with
nitrogen or air. Otherwise, poisoning, re, or explosion may
result due to gas leakage.
CAUTION
Be sure to observe the following to perform work safely,
avoiding electric shock or injury.
• Remove the watch and other metallic objects before work.
• Do not touch the instrument wet-handed.
• If the fuse is blown, eliminate the cause and replace it with the
one of the same capacity and type. Otherwise, electric shock
or accidents may result.
• Do not use replacement parts other than those specied by
the manufacturer. Otherwise, intended performance may not
be achieved, or accidents or failures may result.
• Dispose replacement parts such as maintenance parts as in
combustibles according to the local waste disposal regulations .
Others
CAUTION
• If the cause of a fault cannot be identied by referring to the
instruction manual, be sure to contact your dealer or
Yokogawa technician in charge of adjustment. Disassembling
the instrument carelessly may result in electric shock or injury.
• Do not use the supplied power cord with another device.
Notes on Use in Korea
The AC cord with the following products is not compliant with the safety standards in Korea.
Please do not use it to connect household appliances in Korea.
It is prohibited to use an adapter connector to change the plug shape for the AC cord of the following
products.
• IR400--J/
• IR400--E/
nProduct Disposal
The instrument should be disposed of in accordance with local and national legislation/regulations.
nAuthorized Representative in EEA
The Authorized Representative for this product in EEA is Yokogawa Europe B.V. (Euroweg 2, 3825
HD Amersfoort, The Netherlands).

v
IM 11G02N01-01E
<Introduction>
After-Sales Warranty
Do not modify the product.
Yokogawa warrants the product for the period stated in the pre-purchase quo-
tation. Yokogawa shall conduct dened warranty service based on its stand-
ard. When the customer site is located outside of the service area, a fee for
dispatching the maintenance engineer will be changed to the customer.
During the warranty period, for repair under warranty carry or send the prod-
uct to the local sales representative or service ofce. Yokogawa will replace or
repair any damaged parts and return the product to you.
Before returning a product for repair under warranty, provide us with the model name and serial
number and a description of the problem. Any diagrams or data explaining the problem would
also be appreciated.
If we replace the product with a new one, we won’t provide you with a repair report.
In the following cases, customer will be charged repair fee regardless of war-
ranty period.
Failure of components which are out of scope of warranty stated in instruction manual.
 Failure caused by usage of software, hardware or auxiliary equipment, which Yokogawa did not
supply.
Failure due to improper or insufcient maintenance by user.
Failure due to misoperation, misuse or modication which Yokogawa does not authorize.
Failure due to power supply (voltage, frequency) being outside specications or abnormal.
Failure caused by any usage out of scope of recommended usage
Any damage from re, earthquake, a storm and ood, lightning, disturbance, riot, warfare,
radiation and other natural changes.
Yokogawa does not warrant conformance with the specic application at the
user site.
Yokogawa will not bear direct/indirect responsibility for damage due to a spe-
cic application.
Yokogawa will not bear responsibility when the user congures the product
into systems or resells the product.
Maintenance service and supplying repair parts will be covered for ve years
after the production ends. For repair this product, please contact the nearest
sales ofce described in this instruction manual.

Blank Page

Toc-1
IM 11G02N01-01E
<CONTENTS>
Model IR400
Infrared Gas Analyzer
CONTENTS
IM 11G02N01-01E 5th Edition
PREFACE .............................................................................................................................. i
CAUTION ON SAFETY........................................................................................................ ii
After-Sales Warranty ...................................................................................................... v
1. OVERVIEW ................................................................................................ 1-1
2. NAME AND DESCRIPTION OF EACH UNIT ........................................... 2-1
2.1 Name and description of main unit................................................................. 2-1
2.2 Input/Output terminal module ......................................................................... 2-2
3. INSTALLATION ......................................................................................... 3-1
3.1 Installation conditions...................................................................................... 3-1
3.2 Installation ......................................................................................................... 3-2
3.2.1 Installation of analyzer main frame .................................................... 3-2
3.2.2 Mounting input/output terminal module ............................................. 3-3
3.3 Piping ................................................................................................................. 3-4
3.4 Sampling ............................................................................................................ 3-7
3.4.1 Conditions of sampling gas................................................................ 3-7
3.4.2 Sampling gas ow.............................................................................. 3-7
3.4.3 Preparation of standard gas .............................................................. 3-7
3.4.4 Reduction of moisture interference.................................................... 3-7
3.4.5 Purging of instrument inside .............................................................. 3-8
3.4.6 Pressure at sampling gas outlet ........................................................ 3-8
3.4.7 Example conguration of gas sampling system ................................ 3-9
3.5 Wiring ............................................................................................................... 3-10
3.5.1 Power inlet ....................................................................................... 3-10
3.5.2 Input/Output terminal module .......................................................... 3-10
4. OPERATION .............................................................................................. 4-1
4.1 Preparation for operation................................................................................. 4-1
4.2 Warm-up operation and regular operation..................................................... 4-1
5. DESCRIPTION OF DISPLAY AND OPERATION PANELS ..................... 5-1
5.1 Name and description of operation panel...................................................... 5-1
5.2 Overview of display and operation panels..................................................... 5-2
5.3 Outline of display screen ................................................................................. 5-3
5.4 General operation ............................................................................................. 5-6
6. SETTING AND CALIBRATION ................................................................. 6-1

Toc-2
IM 11G02N01-01E
<CONTENTS>
6.1 Switch of range ................................................................................................. 6-1
6.1.1 Setting of range switch mode............................................................. 6-1
6.1.2 Manual range switch.......................................................................... 6-2
6.2 Calibration setting ............................................................................................ 6-3
6.2.1 Setting of calibration concentration.................................................... 6-3
6.2.2 Setting of manual zero calibration ..................................................... 6-5
6.2.3 Setting of calibration range ................................................................ 6-7
6.2.4 Setting of auto calibration component/range..................................... 6-9
6.3 Alarm setting ................................................................................................... 6-11
6.3.1 Setting of alarm values .................................................................... 6-11
6.3.2 Hysteresis setting............................................................................. 6-13
6.4 Setting of auto calibration.............................................................................. 6-14
6.4.1 Auto calibration ................................................................................ 6-14
6.4.2 Forced run/stop of auto calibration .................................................. 6-17
6.5 Setting of auto zero calibration ..................................................................... 6-20
6.5.1 Auto zero calibration ........................................................................ 6-20
6.5.2 Forced run/stop of auto zero calibration .......................................... 6-22
6.6 Peak alarm setting .......................................................................................... 6-25
6.7 Parameter setting............................................................................................ 6-27
6.8 Maintenance mode ......................................................................................... 6-34
6.9 Calibration ....................................................................................................... 6-40
6.9.1 Zero calibration ............................................................................... 6-40
6.9.2 Span calibration ............................................................................... 6-41
7. MAINTENANCE......................................................................................... 7-1
7.1 Daily check ........................................................................................................ 7-1
7.2 Daily check and maintenance procedures..................................................... 7-1
7.3 Maintenance of analyzer unit........................................................................... 7-2
7.3.1 Cleaning method for sample cell (pipe cell)....................................... 7-2
7.3.2 Cleaning method for sample cell (block cell) ..................................... 7-4
7.3.3 Optical zero adjustment method (optical balance adjustment) ......... 7-6
7.3.4 Moisture interference compensation adjustment method ................. 7-7
7.3.5 Replacement of fuse on analyzer unit ............................................... 7-8
7.4 Inspection and maintenance of limited service-life components ............... 7-9
8. TROUBLE SHOOTING 0 .......................................................................... 8-1
8.1 Error message................................................................................................... 8-1
8.2 Troubleshooting................................................................................................ 8-3
9. SPECIFICATIONS ..................................................................................... 9-1
9.1 General specications ..................................................................................... 9-1
9.2 Model and Sufx codes.................................................................................... 9-7
9.3 External Dimensions ...................................................................................... 9-12
Customer Maintenance Parts List......................................CMPL 11G02N01-01E
Revision Information ...............................................................................................i

<1. OVERVIEW> 1-1
IM 11G02N01-01E
1. OVERVIEW
This infrared gas analyzer (type: IR400) measures the concentration of NO, SO2, CO2, CO and
CH4 contained in sampling gas on the principle that different atomic molecules have an absorption
spectrum in the wave band of infrared rays, and the intensity of absorption is determined by the
Lambert-Beer law.
Since this instrument incorporates a compact paramagnetic O2 sensor, it allows measuring up to
5 components simultaneously by using the built-in O2 sensor (up to 4 components if O2sensor is
excluded).
Furthermore, use of a microprocessor or large sized liquid crystal display realizes improvement of
operability, accuracy and multi-functions.
This instrument is optimum for measuring combustible gas exhausted from boilers or incinerators, and
it is effective for steel gas analysis (blast furnace, steel converter, thermal treatment furnace, sintering
(Pellet equipment), coke furnace), storage and maturity of vegetable and fruit, biochemistry (microbe),
[fermentation], air pollution [incinerator, exhaust gas desulfurization, denitration], automotive emission
(excluding tester), protection against disasters [detection of explosive gas and toxic gas, combustion
gas analysis of new building material], growth of plants, chemical analysis [petroleum renery plant,
petroleum chemistry plant, gas generation plant], environment [landing concentration, tunnel
concentration, parking lot, building management] and various physical and chemical experiments.

Blank Page

<2. NAME AND DESCRIPTION OF EACH UNIT> 2-1
IM 11G02N01-01E
2. NAME AND DESCRIPTION OF EACH
UNIT
2.1 Name and description of main unit
POWER
(1) Handle
(2) Power switch
(5) Sampling gas outlet
(4) Sampling gas inlet
(4) Sampling gas inlet
(3) Display/operation panel
For measuring
unit 1
For measuring
unit 2
(6) Sector motor
(7) Light source cover (9) Power inlet
(5) Sampling gas outlet
(8) Input/Output terminal connector
(or purge gas inlet)
Front panel
Back panel
(10) Protective cover
Fig2-1.ai
Fig. 2-1
Name Description Name Description
(1) Handle
(2) Power switch
(3) Display/operation
panel
(4)
Sampling gas inlet
(5) Sampling gas
outlet
Used for withdrawing the main
unit from the panel.
Used for ON/OFF the analyzer.
Liquid crystal display and keys
for setting various functions.
For connecting to the measuring
gas tube.
Connect to the exhaust line. (A
pair of sampling gas inlet/outlet
is provided for each measuring
unit.
When ordered with purge, the
piping to measuring unit 2 is built
inside. In this case, the sample
gas outlet for measuring unit 2 is
used for purge gas inlet.)
(6) Sector motor
(7) Light source
cover
(8) Input/Output
terminal connector
(9) Power inlet
(10) Protective cover
For driving the rotation of
sector.
Infrared light source is
arranged in the cover.
For connecting to the external
input/output terminal module.
For connecting the power
cable.
Protective cover for the light
source and the motor. May be
removed during operation.

<2. NAME AND DESCRIPTION OF EACH UNIT>
2-2
IM 11G02N01-01E
2.2 Input/Output terminal module
This analyzer provides input/output of various signals from the supplied input/output terminal module
by connecting the instrument to this module.
TN1 TN2 TN3 TN4 TN5
Input/Output terminal module
(1) Mounting hole (Ø4.5, 6 places)
(2) Input/Output terminal block (TN1 to TN5)
(6) Communication connector (CN2)
(3) Cable connection connector (CN1)
(5) Calibration solenoid valve drive signal
output connector (CN3)
(4) Analyzer main unit Input/Output terminal module connection cable (1 m)
Fig2-2.ai
Fig. 2-2
Name Description Name Description
(1) Mounting hole
(2) Input/Output
terminal block
(TN 1 to TN 5)
(3)
Cable connection
connector
(CN1)
Used for mounting input/
output terminal module.
Ø4.5, 6 places
Input/Output terminal for
signals of analog output,
range identication contact,
alarm contact output, etc.
Used for connecting the
analyzer main unit and the
input/output terminal module
(4).
(4) Input/Output
terminal module
connection cable
(5) Calibration
solenoid valve
drive signal
output connector
(6) Communication
connector
Used for connecting the
analyzer main unit to the input/
output terminal module.
Cable connector for connecting
the analyzer to the relay board
for automatic calibration.
Connect communication cable.
*Please refer to another manual
(IM 11G02P01-01E) about
communication function.
.

<3. INSTALLATION> 3-1
IM 11G02N01-01E
3. INSTALLATION
DANGER
This unit is Non-Explosion-proof type. Do not use it in a place with explosive gases to prevent
explosion, re or other serious accidents.
CAUTION
• Entrust the installation, movement or re-installation to a specialist or the supplier. A poor
installation may cause accidental tip over, shock hazard, re, injury, etc.
• The gas analyzer is heavy. It should be installed with utmost care. Otherwise, it may tip over or
drop, for example, causing accident or injury.
• For lifting the gas analyzer, be sure to wear protective gloves. Bare hands may invite an injury.
• This unit should be installed in a place which conforms to the conditions noted in the instruction
manual. Otherwise, it may cause electric shocks, re or malfunction of the unit.
• During installation work, care should be taken to keep the unit free from entry of cable chips or
other foreign objects. Otherwise, it may cause re, trouble or malfunction of the unit.
3.1 Installation conditions
To install the analyzer for optimum performance, select a location that meets the following conditions;
(1) This instrument is system built in type. This instrument should be used while embedded in a
panel, locker, or enclosure of steel sheet.
(2) Use this instrument indoors.
(3) A vibration-free place
(4) A place which is clean around the analyzer.
(5) Power supply
Rated voltage : 100 V to 240 V AC
Operating voltage : 85 V to 264 V AC
Rated frequency : 50/60 Hz
Power consumption : 250 VA max.
Inlet : Conformity to EN60320 Class I type 3-pin inlet
(6) Operation conditions
Ambient temperature : -5 to 45°C
Ambient humidity : 90%RH or less, no condensation

<3. INSTALLATION>
3-2
IM 11G02N01-01E
3.2 Installation
3.2.1 Installation of analyzer main frame
Installation methods for the analyzer main unit are divided into 2 types;
450 or more
465
101.6
M6 Slide rail
(Supports mass)
Slide rail
(Supports mass)
Type External dimensions Mounting dimensions Mounting method
19 inch rack
mounting guide
rail method
19 inch rack
mounting slide
rail method
429
177
483
(Unit : mm)
F3_2_1.ai
Note 1 Check and maintenance of the analyzer main unit may be carried out with the top cover detached.
The guide rail method may be used if a space accessible for maintenance is provided at the top of the main unit.
If maintenance space is not provided specially, it is recommended to use the slide rail method.
Recommended slide rail: Product No.: 305A-24 manufactured by Accuride International Co.
Note 2 For 19 inch rack mounting, the weight of the analyzer is supported with the bottom of the case (with the side of the case in
case of slide rail method). For mounting dimensions of the slide rail, see “Item 9.3 External diagram”.
Don’t install the analyzer at a place which is exposed to direct sunlight.
The analyzer should be installed at a place where ambient temperature is within -5 to 45°C, and temperature uctuation
during use is minimum.

<3. INSTALLATION> 3-3
IM 11G02N01-01E
3.2.2 Mounting input/output terminal module
Mount the input/output terminal module on the panel; observing the following method.
(Note) To avoid the effect of noise generated from external units, mount the I/O terminal module
mounting plate on the panel for continuity at the mounting surface and connect the panel
to the same ground as the analyzer main unit.
External dimensions Mounting dimensions Mounting method
Terminal
Screwed to panel
Panel plate
To analyzer rear panel
Connection cable
4.5 mounting hole (× 6 places) M4 screw (× 6 places)
Rectangular hole
302
142142 154
150 150
316
164
p3-03_1.ai
Note) How to ground analyzer main unit and I/O terminal module
To avoid the effect of noises, etc. from external units, it is recommended to ground them by the procedure described below.
*Don’t separate the analyzer and I/O terminal module, and be sure to
ground them together.
Mount the analyzer and I/O terminal module on the
same panel.
Bring I/O terminal module sheet metal and
panel into continuity at ///// portion.
Bring analyzer main unit and panel into continuity
at ///// portion or rail mounting portion.
(No grounding is required at the power terminal).
Ground the panel casing.
F_3.1.2-4.ai

<3. INSTALLATION>
3-4
IM 11G02N01-01E
3.3 Piping
Piping should be connected to the gas inlets and outlets of the front panel of the analyzer.
• Use a corrosion resistant tube of Teon, stainless or polyethylene to connect the instrument to
a sampling system. Even if there is a danger of corrosion, refrain from using a tube of rubber
or soft vinyl. The instrument provides inaccurate indication due to gas absorption by piping
materials.
• Pipe connection port is Rc1/4 female thread (or 1/4 NPT). Piping should be cut as short as
possible for a quick response. About 4 mm inner diameter is recommended.
• Entry of dust into the instrument may result in defective operation. Use a clean piping or coupling.
Connect the gas tube by the following method.
Sampling gas outlet
Sampling gas inlet
Sampling gas outlet
(Purge gas inlet)
Sampling gas inlet
For measuring
unit 1
For measuring
unit 2
F3_3_1.ai
Sampling gas inlet: Attach the gas tube to introduce gas to be measured such as one that has
completed dehumidication process and standard gases for zero and span
calibration to this inlet.
Gas ow to be introduced should be constant within the range of 0.5 ± 0.2
L/min.
Sampling gas outlet: Exhaust measured gas through the outlet. Attach the tube to exhaust
measured gas outdoors or to the atmosphere.
Purge gas inlet: It is used for purging the inside of the total gas analyzer . When the analyzer
must be purged, refer to Item 3.4.5 Purging of instrument inside.
Use dry gas N2 or instrumentation air for purge gas. (ow rate of 1 L/min or
more should be used and no dust or mist is contained).

<3. INSTALLATION> 3-5
IM 11G02N01-01E
Internal piping diagram
Measuring unit 2
Measuring unit 1
Sampling cell
Note)
2 cells may be used
by combination of
range.
OUTLET INLET OUTLET INLET
Sampling gas inlet
Sampling gas outlet
For measuring
unit 1
Sampling gas inlet
Sampling gas outlet
For measuring
unit 2
Built-in
O2sensor
Built-in
O2sensor
F3_3_2.ai
Note) When the purge gas inlet is provided, the piping to measuring unit 2 is built inside.
Correspondence of measured components and measuring units
Measuring components Measuring unit 1 Measuring unit 2
1-component Analyzer for
NO, SO2, CO2, CO and CH4
Each component None
2-component Analyzer for
NO-SO2 and CO2-CO
NO-SO2
CO2-CO
None
2-component Analyzer for
NO-CO
NO CO
3-component Analyzer for
NO-SO2-CO
NO-SO2CO
4-component Analyzer for
NO-SO2-CO2-CO
NO-SO2CO2-CO
Note) When there are two measuring units, the built-in O2 sensor must be connected to the measuring unit 2.

<3. INSTALLATION>
3-6
IM 11G02N01-01E
Example of connecting each measuring unit
NO2 / NO
converter
Note) The NO2/NO converter is used
when NO measurement is used for NOxmeasurement.
NO2 / NO
converter
Note) The NO2/NO converter is used
when NO measurement is used for NOxmeasurement.
• Two pair of gas inlet/outlet - (2)
IR400
• One pair of gas inlet/outlet
Filter
Flowmeter
0.5 L/min
IR400
Exhaust
Release to atmosphere.
Sampling gas
Filter
Flowmeter
0.5 L/min
Sampling gas
inlet
Sampling gas
outlet
Sampling gas
inlet
Sampling gas
outlet
IR400
Exhaust
Release to atmosphere.
Sampling gas
inlet
Sampling gas
outlet
Sampling gas inlet
Sampling gas outlet
Exhaust
Release to atmosphere.
Sampling gas
Filter
Flowmeter
0.5 L/min
Sampling gas
Filter
Flowmeter
0.5 L/min
• Two pair of gas inlet/outlet - (1)
Filter
For
measuring
unit 1
Sampling gas
inlet
Sampling gas
outlet
For
measuring
unit 2
For
measuring
unit 1
For
measuring
unit 2


F3_3_3.ai

<3. INSTALLATION> 3-7
IM 11G02N01-01E
3.4 Sampling
3.4.1 Conditions of sampling gas
1. Dust contained in the sampling gas should be completely removed with a lter. For the nal
stage lter, use a lter that allows removing dust particles of 0.3 mm.
2. Dew point of sampling gas must be lower than the ambient temperature to avoid occurrence of
drain in the gas analyzer. If vapor is contained in the sampling gas, dew point should be lowered
to 0°C by using a dehumidier.
3. If SO3 mist is contained in the sampling gas, use a mist lter or cooler to remove SO3 mist.
Other mists should be removed by using a mist lter or cooler.
4. Corrosive gases such as Cl2, F2 and HCl, if they are contained in the sampling gas in
considerable amounts, will shorten the life of instruments.
5. Temperature of sampling gas should be within 0 to 50°C. Provide a means that prevents entry of
hot gas directly into the instrument.
3.4.2 Sampling gas ow
Flow of sampling gas should be 0.5 ± 0.2 L/min.
Avoid ow uctuation during measurement.
Observe the ow reading by a owmeter provided as shown in the example of the sampling system
conguration (Item 3.4.7).
3.4.3 Preparation of standard gas
Routine calibration is required by standard gas for keeping this instrument under normal operation
condition (once a week). Prepare a standard gas cylinder for zero calibration and span calibration.
Analyzer without
O2 measurement
Analyzer with built-in
O2sensor
Analyzer with external
zirconia O2sensor
Zero gas N2gas N2gas Dry air or atmospheric air
Span gas other
than for O2
measurement
Gas with concentration
of 90% or more of full
scale
Gas with concentration of
90% or more of full scale
Gas with concentration of 90%
or more of full scale
Span gas for O2
measurement
Gas with concentration of
90% or more of full scale or
atmospheric air (21%)
1 to 2%O2
3.4.4 Reduction of moisture interference
NO and SO2 measurement is subject to moisture interference.
As shown by the conguration example on the next page, provide a device for humidifying zero
calibration gas, thus controlling the moisture content at a constant level (moisture content in sample
gas should also be controlled here) in conguring a sampling system. That allows the same moisture
content as in the case of measurement to be contained in zero gas for calibration.