PREFACE We are grateful for your purchase of Yokogawa’s Infrared Gas Analyzer (Model : IR200). • 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.
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”.
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Caution on piping In piping, the following precautions should be observed. DANGER Wrong piping may cause gas leakage. If the leaking gas contains a toxic component, there is a risk of serious accident being induced. Also, if combustible gas is contained, there is a danger of explosion, fire or the like occurring.
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Caution on use • Do not allow metal, finger or others to touch the input/output PROHIBITION terminals in the instrument. Otherwise, shock hazard or injury may occur. • Do not smoke nor use a flame near the gas analyzer. Otherwise, a fire may be caused.
Do not modify the product. During the warranty period, for repair under warranty carry or send the product to the local sales representative or service office. Yokogawa will replace or repair any damaged parts and return the product to you.
CONTENTS PREFACE..........................i CAUTION ON SAFETY ....................ii After - Sales Warranty ....................v 1. OVERVIEW ......................... 1-1 2. NAME AND DESCRIPTION OF EACH PART ............. 2-1 Description of each unit .................. 2-1 3. INSTALLATION ......................3-1 Selection of installation location ..............3-1 Installation of analyzer ..................
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7. MAINTENANCE ......................7-1 Daily check ...................... 7-1 Daily check and maintenance procedures ............7-1 Replacement of power fuse................7-2 Moisture interference compensation adjustment ..........7-3 Cleaning of measuring cell ................7-4 7.5.1 Disassembly and assembly of measuring cell ........7-4 7.5.2 How to clean cell ..................
1. OVERVIEW The infrared gas analyzer (IR200) measures the concentrations of CO , CO, CH , SO , NO and O contained in sample gas. , CO, CH , SO , and NO are measured by non-dispersion infrared method, while O is measured by paramagnetic or fuel cell method.
2. NAME AND DESCRIPTION OF EACH PART 2.1 Description of each unit (1) Handle (2) Power switch (3) Display and operation panel (11) Terminal block 5 (10) Terminal block 4 (6) Purge gas inlet (5) Sampling gas outlet (4) Sampling gas inlet (12) Power inlet (13) Connector 2 (7) Terminal block 1...
3. INSTALLATION DANGER This unit is not explosion-proof type. Do not use it in a place with explosive gases to prevent explosion, fire or other serious accidents. CAUTION • For installation, observe the rule on it given in the instruction manual and select a place where the weight of gas analyzer can be endured.
3.2 Installation of analyzer There are two methods of installing the analyzer. For detailed dimensions, see Chapter 9.3. (Unit:mm) Types External dimensions Mounting method Mounting dimensions Guide rail INFRARED GAS ANALYZER Guide rail POWER MODE ZERO SPAN 450 or more Slide rail Slide rail Note) The mounting method should be selected to meet the installation requirements since the top...
Observe the following when connecting the gas pipes. • The pipes should be connected to the gas inlet and outlet at the rear panel of the analyzer, respectively. • Connect the sampling system to the instrument by using corrosion-resistant tube such as Teflon, stainless steel, or polyethylene.
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(2) Sampling gas flow rate A flow rate of sampling gas must be 1 ± 0.5L/min. A flow meter should be provided as shown in Fig. 3-2 to measure flow rate values. (3) Preparation for standard gas Prepare the standard gas for zero/span calibration. Externally mounted Without O Analyzer...
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The system configuration may vary depending upon the nature of measured gas, coexistent gases or application. A typical configuration diagram is shown in Fig. 3-2. Since a system configura- tion depends upon measured gas, consult with Yokogawa. Measurement of sample gas with low moisture content (room-temperature saturation level or below):...
3.5 Wiring method Caution on wiring • Wiring work must be performed with the main power set to OFF to prevent electric shocks. CAUTION • Enforce construction of class-D grounding wire by all means, 100 or less. If the specified grounding construction is neglected, a shock hazard or fault may be caused.
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When noise source is in the vicinity Do not install the instrument near an electric device IR200 power supply that generates noise from the power supply (such as Varistor or high-frequency furnace and electric welder). If spark killer there is no other choice but to install it near such devices, provide completely separate power line to Locate and connect in close proximity...
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(4) Contact input (DI): terminal block 2, , terminal block 3, • It is for a contact input at no voltage. An input is provided when switching to short circuit (on) or open (off). • No voltage is applied to the terminals. (5) Contact output (DO): terminal block 3, , terminal block 4 and terminal block 5 •...
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(7) List of terminal blocks 1 to 5 Terminal block 1 Terminal block 2 <TN1> <TN2> CH5 output Unused sensor input Unused (AO) CH4 remote range CH4 output Unused Unused changeover input (AO) (DI) CH3 remote range CH3 output CH8 output Unused changeover input (AO)
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(8) Description on terminal block Terminal block 1 <TN1> Terminal block for analog output (non-isolated output) Terminal block 1 Output : 4 to 20 mA or 0 to 1 V DC <TN1> Between 1 – 2 : CH5 output CH5 output Unused Between 3 –...
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Terminal block 3 <TN3> Between 1 to 4 : For internal connection. Must not be wired. (Must not be used as junction terminal.) Terminal block 3 <TN3> Between 5 – 6 : Remote hold input. No hold Instrument error when open. Output hold when Unused (DO) short-circuited.
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Terminal block 5 <TN5> 1 and 11 – 14 : For internal connection. Must not be wired. (Must not be used as junction terminal.) Between 2– 3 : CH3 alarm output. Conductive at 2– 3 and open at 3– 4 when set value is and 3–...
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(9) Timing of calibration contact output 1. Manual calibration (See “6.9 Calibration”). ZERO • Zero calibration Calibration end Pump ON/OFF contact Zero calibration contact CH1 to CH4 span calibration contact Output hold function Output signal hold (with hold ON setting) Hold extension time When selecting CH2 using...
4. OPERATION 4.1 Preparation for operation (1) Check of gas sampling tube, exhaust tube and wiring Check that the pipes are correctly connected to the gas sampling port and drain port. Check that the analyzer is correctly wired as specified. 4.2 Warm-up operation and regular operation (1) Operation procedure 1.
DESCRIPTION OF DISPLAY AND OPERATION PANEL This section describes the display and operation panel of the gas analyzer. It also explains the name and description of function on the operation panel. See Fig. 5-1. 5.1 Name and description of operation panel Display INFRARED GAS ANALYZER POWER...
5.2 Overview of display and operation panel *1) The screen configuration depends upon the display channel. When channel 5 or later is displayed on the screen, scroll the • Measurement mode screen by using the UP or DOWN key. ZERO ZERO Calibration •...
5.3 Overview of display screen (1) Measurement mode screen On turning on the power switch, the Measurement Mode screen will appear. The measurement screen depends on the number of components. The following screen configura- tion shown as an example is for CO , CO, O (Output at channel 6).
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• O correction concentration average value: CH (component) where “ ** ” is displayed as “ CO” in the component display and O average value, a value obtained by averaging O conversion concentration value or O concen- tration value in a fixed time is output every 30 seconds. Averaging time can be changed between 1 minute and 59 minutes or 1 hour and 4 hours accord- ing to the average time settings (See 6.7 Parameter setting).
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(3) Contents of measured channel (CH) The contents in each measured CH corresponding to the type are given below: Suffix/Option Code Output and Corresponding Channel Measurable O2 correction component analyzer Not specified Not specified Not specified Not specified Not specified Not specified Not specified Not specified...
5.4 General operation • Measurement mode The measurement mode can be displayed for up to 5 channels in a single screen. When viewing a channel beyond the 5 channels, ZERO press the ( ) key and the screen can be scrolled one by one See 6.9.1, Zero channel at a time.
6. SETTING AND CALIBRATION 6.1 Changeover of range This mode is used to select the ranges of measured MODE components. 1. During measurement, press the key to MODE display the User mode. 2. Point the cursor to “Changeover of Range”. Press the key.
6.2 Calibration setting This mode is used to set calibration concentration and actions. The calibration setting involves calibration concentration, calibration gas, zero calibration, calibration range and auto-calibration component. “Calibration Gas” is displayed if NO or SO is included in components to be analyzed. 6.2.1 Setting of calibration concentration It allows you to set concentrations of the standard gas (zero and span) of each channel used for calibration.
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5. In the “Calibration Concentration Selec- tion” screen that appears, select any concentration item you want to set by pressing the key. Note) Analyzers other than the zirconia instrument cannot perform zero setting. Cursor for setting value 6. In the “Calibration Concentration Value Setting”...
6.2.2 Setting of calibration gas Whether moisture is contained in zero gas and span gas used for calibration can be set in advance as follows. Make the setting according to the sampling system created. If sampling system controls the moisture content in the calibration gas (ZERO or SPAN) to become the same as that in the sample gas to be fed to the analyzer using an electronic cooler, etc., set “With”...
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(5) On the “Gas Selection” screen that appears, select “with” or “without” of moisture content in calibration gas using or the key. • Select “with” to have the calibration gas contain a certain amount of moisture. • Select “without” to use dry gas (moisture content: saturated at 70°C or lower) such as cylinder gas as calibration gas.
6.2.3 Setting of manual zero calibration If zero calibration is to be made manually, select whether to calibrate all components at once or each of them separately upon selection. MODE 1. During measurement, press the MODE to display the User mode. 2.
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5. In the “Zero Calibration Selection” screen that appears, select “at once” or “each” by pressing the key. When selecting “at once”, the CH (com- ponents) to be set can be zero-calibrated at the same time. When selecting “each”, either of the CH (components) to be selected is zero-calibrated.
6.2.4 Setting of calibration range This mode is used to set if the range of each CH (component) at the zero and span calibration (manual calibration or auto calibration) should be calibrated with a single range or 2 ranges. MODE 1.
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5. In the “Calibration Range Selection” screen that appears, select “both” or “current” by pressing the key. • When selecting “both”, Range 1 and Range 2 of the set CH are calibrated together. • When selecting “current”, the range alone displayed at the set CH is calibrated.
6.2.5 Setting of auto-calibration component It sets the CH (component) to be calibrated in the auto-calibration. MODE 1. During measurement, press the MODE to display the User mode. 2. Point the cursor to “Setting about Cali- bration” by pressing the key.
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5. In the “Auto Calibration component Selection” screen that appears, select “enable” or “disable” by pressing the key. After setting, press the key. To close Auto Calibration Component setting To close “Setting of Auto Calibration Component” or to cancel this mode midway, press the key.
6.3 Alarm setting 6.3.1 Setting of alarm values This mode is used to set the upper and lower limit value to provide an alarm output against measured concentration during measurement. Before changing the alarm setting, set the ON/OFF to OFF. MODE 1.
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After setting, the alarm setting is now Cursor for setting value completed by pressing the key. To close the Alarm Setting To close the " Alarm Setting" or to cancel this mode midway, press the key. A previous screen will return. Setting Range 0 to 100%FS (Settable in each range) End of Alarm Setting...
6.3.2 Hysteresis setting To prevent chattering of an alarm output near the alarm setting values, set hysteresis. 1. In the “Alarm Setting CH Selection” screen that appears, point the cursor to “Hysteresis” by pressing the key. Press the key. 2. In the “Hysteresis Value Setting” screen that appears, enter hysteresis values.
6.4 Setting of auto calibration 6.4.1 Auto calibration Auto calibration is automatically carried out MODE when zero calibration and span calibration are set. Before changing the setting of auto calibration, set the ON/OFF to “OFF”. 1. During measurement, press the MODE to display the User mode.
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The auto calibration status contact output is closed while auto calibration is in progress (hold extension time by the length of time the same as gas replacement time included if the hold setting is set to “ON”), and open in other cases. Example Start Time 12:00...
6.4.2 Forced stop of auto calibration This mode is used to cancel the auto calibration forcedly. 1. In the User mode that is displayed, point the cursor to “Setting of Auto Calibra- tion” by pressing the key. Press the key. 2.
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“Auto Calibration” screen Example In case where setting the auto calibration components (see Item 6.2.5) to “CH1: enable” and “CH2: enable”. • Zero calibration A message, “Zero calibration” blinks at CH1 and CH2. • CH1 span calibration A message, “Span calibration” blinks at CH1.
6.5 Setting of auto zero calibration 6.5.1 Auto zero calibration Auto zero calibration is automatically carried out when zero calibration are set. Components for which a calibration is to be made are determined by setting of auto calibra- MODE tion component in 6.2.5. Before changing the setting of auto zero calibra- tion, set the ON/OFF to “OFF”.
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The auto calibration status contact output is closed while auto zero calibration is in progress (hold extension time by the length of time the same as gas replacement time included if the hold setting is set to ON), and open in other cases. Example Start Time 12:00...
6.5.2 Forced stop of auto zero calibration This mode is used to cancel the auto zero calibration forcedly. 1. In the User mode that is displayed, point the cursor to “Setting of Auto Zero Calibration” by pressing the key. Press the key.
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“Auto Zero Calibration” screen Example In case where setting the auto calibration components (see Item 6.2.5) to “CH1: enable” and “CH2: enable”. • Zero calibration A message, “Zero calibration” blinks at CH1 and CH2. Caution During auto zero calibration, any key operation is not permitted other than operations such as key lock ON/OFF and “Forced Stop of Auto Zero Calibration”.
6.6 Peak alarm setting When the number of peaks of which CO concentration exceeds the upper limit value exceeds the setting time, a peak alarm is outputted. This section describes how to perform various settings of peak alarm. The setting is optional and is valid only Note) MODE when peak alarm function is provided.
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Setting range • Alarm Value : 0 to 1000 ppm 5 ppm step (initial value: 500 ppm) • Alarm Count : 1 to 99 times (initial value: 5 times) • Hysteresis : 0 to 20% of full scale (initial value: 0% of full scale) * The hysteresis setting is made in terms of full scale.
6.7 Parameter setting It allows you to carry out the parameter setting such as time, key lock, etc., as required. Items to be set are as follows: Description of setting items • Current Time : Sets the current day of the week, hour and time. Note: The clock backup time is 2 days.
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4. In the Parameter Setting screen that appears, enter the numeric values and set the items. Entering the numeric values or setting the items should be carried out by using the key. To move the cursor to the right, press the key.
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(2) Auto calibration Auto calibration start Auto calibration end Calibration Hold extending time Output hold Time hold set to the gas flow time (3) External hold Strapped Open Remote hold Output hold (4) Screen display during holding The “Holding” message blinks on the measuring screen. Since the screen displays the process of calibration is displayed during the manual calibration, “Holding”...
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Average period It allows you to set an average period of the average value of O correction. It enables you to set an average time of 1 to 59 minutes (1-minute step) or 1 to 4 hours (1-hour step). Changing the setting resets the average value of correction and O average value.
6.8 Maintenance mode Check of sensor input value, display of error log file, setting of O correction reference value, adjustment of moisture interference, setting of auto off time of display backlight, and password setting can be performed as follows. A password is selected first. The password must be entered to perform measurement from next time onward.
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• O correction reference value setting screen Description of O corection reference value setting screen correction value is calculated from the following equation by values set herein: correction concentration value 21 set value component concentration 21 - O concentration measured value measured value The value of the fractional part in this calculation is limited to 4.
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• Moisture interference compensation adjustment screen Description of moisture interference compensation adjustment screen By setting the effect of moisture content in measured gas on this screen, the value of the effect is subtracted to find the measurement value. Adjustment is carried out by one of the following methods.
6.9 Calibration ZERO 6.9.1 Zero calibration It is used for zero point adjustment. For zero calibration gas, see 3.4 (3), Preparation for standard gas in Sampling. Use a gas accord- ing to application. 1. Press the key on the Measurement ZERO screen to display the Manual Zero Cali- bration screen.
6.9.2 Span calibration It is used to perform a span point adjustment. Supply calibration gas with concentration set to the span value to perform the span calibration. For the span calibration gas for the NO, SO , CO CO, CH masurement, use the standard gas with a concentration of 90% or more of the range value.
7. MAINTENANCE 7.1 Daily check (1) Zero calibration and span calibration It is used for zero point adjustment. For calibration, refer to 6.9.1, Zero calibration. After zero calibration, perform span calibration. For calibration, refer to 6.9.2, Span calibra- tion. Zero calibration and span calibration should be performed once a week, if required. (2) Flow check Sampling gas flow rate and purge gas flow rate should be as follows;...
7.3 Replacement of power fuse Note) Before fuse replacement, locate the probable cause of a blown fuse. Turn OFF the power switch. Mounting screws (2 places) Detach two mounting screws fastening to the top cover. Power switch Slide the top cover backward, and pull it upward.
7.4 Moisture interference compensation adjustment (1) Be sure to carry out moisture interference compensation adjustment at the following timing when NO or SO is included in components to be analyzed. 1) Before starting operation for the first time after the analyzer is incorporated into the system 2) At periodic inspection to be performed at 6 month to 1 year intervals 3) After the cell is cleaned (2) Adjustment procedure (See “Moisture Interference Compensation Adjustment screen”...
7.5 Cleaning of measuring cell Entry of dust or water drops in the measuring cell contaminates the interior of the cell, thus result- ing in a drift. Clean the inside if dirty. Then, check the sampling device, especially the filter, to prevent the cell from being contaminated by dust or mist.
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Name Screw (for fixing light source unit) Screw (for fixing detector) Screw (for fixing base plate) Base plate Light source unit Screw (for fixing support) Screw (Fixing cell retainer) Chopper motor connector Filter Support Cell retainer Pipe cell O-ring Infrared transmission window Detector Bridge PCB Bridge resistance...
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(2) How to remove block cell (See Fig. 7-2) 1. For Step 1 to 4., see Item 7.5.1, (1) How to remove pipe cell. 5. Remove the connector to the detector output cord from the printed board. For the 2-compo- nent analyzer, remove the output cord connector of the 2-component analyzer detector (No.
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Name Screw (for fixing light source unit) Filter Screw (for fixing detector) Base plate Light source unit Screw (for fixing block cell) Block cell Infrared transmission window (window holder) O-ring Screw (for fixing base plate) Chopper motors connector Detector (13) Detector: Install in the 2-component analyzer (14) Screws: For mounting the 2-component detector...
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How to remove measuring unit (See Fig. 7-3) 1. For Step 1. to 4., see Item 7.5.1(1), How to remove pipe cell.5. Remove the detector output cord connector from the printed board. 6. Remove wiring to the 2-pin terminals of the infrared ray light source assembly and chopper motor pin connector (No.
7.5.2 How to clean cell 1. To clean the cell inside or infrared ray transmission window, first clear large dirt of it with a soft brush and then wipe with soft cloth lightly. Don’t use hard cloth. Note) Handle the fragile window with care. Use care not to rub off the dirt from the window roughly.
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Precautions to be taken while checking 1. When handling reference gas (during calibration), carefully read the reference-gas instruc- tion manual to use the gas correcrtly. In particular, special attention must be taken in han- dling carbon monoxide gases; otherwise, you may suffer from gas poison-ing. 2.
TROUBLESHOOTING Error message If errors occur, the following contents are displayed. Error display Error contents Probable causes Sector motor rotation detector Error No.1 • Infrared ray light source is faulty. signal is faulty. • Sector motor rotation is faulty or stopped. •...
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In case of Error No. 5 and No. 7 Pressing delete the error display. Calibration is continued. Unless another calibration error occurs, calibration is carried out to the end, the Measurement screen returns. Error log file If error occurs, the history is saved in an error log file. The error log file exists in the mainte- nance mode.
Other Troubleshooting The following table shows how to remedy other troubles, such as faulty readings. Symptom Checking Item Remedy, etc. Drift * Check if the sample gas is supplied to * Locate and check gas leaking points, the analyzer at the specified flow rate. and take the proper remedy.
Category II is for Signal requirement; electrical equipment. (1) Signal from Yokogawa’s Zirconia O Pollution degree indicates the degree sensor (Model : ZX8D*C or ZX8D*D) of existence of solid, liquid, gas or other (2) 0 to 1 V DC from an O...
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Auto calibration remote start: (2) Standard functions Auto calibration is carried out only once Output signal holding: according to an external input signal. Cali- Output signals are held during manual and bration sequence is settable in the same auto calibrations by activation of holding way as the cyclic auto calibration.
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(4) Performance (3) Optional functions Repeatability : ±0.5% of full scale correction: : ±1% of full scale Linearity Conversion of measured CO , SO : ±2% of full scale/week Zero drift NO gas concentrations into values at : ±2% of full scale/week Span drift reference O concentration.
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(6) Installation Requirements • Use this instrument .(Select a place where the equipment does not receive direct sunlight, draft/rain or radiation from hot substances.) • Avoid a place where receives heavy vibration. • Select a place where atmospheric air is clean. 9 - 4 IM 11G02M01-01E...
9.2 Model and Suffix codes [Style: S3] Model Suffix code Option code Description IR200 Infrared gas analyzer 19-inch rack mounting type with slide rail Measurable components (note 8) + CO + CO + CH + CO + CH NO + SO NO + CO NO + SO + CO...
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Model and Suffix Codes Model Suffix code Option code Description Infrared gas analyzer 19-inch rack mounting type with slide rail IR200 2nd Component 0 1000 ppm 2nd Range 0 2000 ppm (note 2) 0 2500 ppm 0 5000 ppm 0 1% 0 2% 0 5% 0 10%...
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3: Only available for CO measurement. 4: Only available for CO , CO, SO or NO measurements. 5: O correction is available only for CO, SO , and NO. Both average value output after O correction and average O value output are provided at the same time. A peak count alarm can be provided only for CO measurement.
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4 0 50% 0 100% T09.EPS : Built-in O analyzer measurable range, : External zirconia type O analyzer (in this case, Yokogawa s ZX8D Style C) measurable range analyzer is selectable indifferently to combination with other components. 9 - 8 IM 11G02M01-01E...
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Table 9. Measurable Components and Their Corresponding Channel Numbers Output and Corresponding Channel Suffix/Option Code Measurable O2 correction component analyzer Not specified Not specified Not specified Not specified Not specified Not specified Not specified Not specified Not specified Not specified Not specified Not specified 1, 2, 3...
9.3 External Dimensions (unit: mm) <Top View> <Side View> 88.5 M4 (for slide rail) <Front View> Power Switch INFRARED GAS ANALYZER Applicable both for POWER JIS 100 mm and EIA 101.6 mm MODE ZERO SPAN <Rear View> 1 /4 1 /4 Purge gas inlet, Rc 1 /4 1 /4...
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(2) Accessory slide rail (unit: mm) Model : 305A-20/Accuride International Inc. Closed 530±3 Cabinet member The same or less 1.52t Open (22.7) (9.5) Intermediate member 508.0±0.8 Drawer member 476.2±0.3 1.27t 15.9±0.5 463.5±0.3 352.8±0.3 111.1±0.3 25.4±0.3 12.7±0.3 12.7±0.3 4.5 5.3 4.5 5.3 123.8±0.3 238.1±0.3 365.1±0.3...
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DC signal coming from an analyzer calibrated to 0 to 25% Contact capacity 220 V AC, 1 A (resistive of full scale. Dedicated zirconia O sensor, Model load) ZX8D, is available from Yokogawa. Safety and EMC conforming standards: Measuring method: Zirconia system Safety: EN61010-1...
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/NO Converter Power consumption: Part number: K9350LE (Non-CE conformity) Approx. 85 VA K9350LF (CE conformity) Safety conforming standards: Mounting: Indoor surface mounting EN61010-1 Target gases: General boiler exhaust gas, Pollution degree 2 atmosphere Installation category II Catalyst: Amount; 2 cm Weight: Approx.
Revision Record Manual Title : IR200 Infrared Gas Analyzer Manual Number : IM 11G02M01-01E Edition Date Remark (s) 1s t Oct. 2002 Newly published Aug. 2006 Fully revised due to style change to S3 P. v., Added "After-Sales Warranty". Section 2.1, "Description of each unit": Changed Fig. 2-1. Section 3.4, (6), "Example of sampling system configuration": Changed Fig.
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Edition Date Remark (s) Section 9.3, "External Dimensions," NO /NO Converter: Changed "Part number" descriptions, added" Safety conforming standards" descriptions, deleted "CE Marking" descriptions, and changed "External Dimensions" drawings. IM 11G02M01-01E...
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User’s IR200 Manual Infrared Gas Analyzer Supplement Thank you for selecting our IR200 Infrared Gas Analyzer. In User's Manual, IM 11G02M01-01E, 3rd Edition, supplied with the product, some corrections/additions have been made. Please replace the corresponding pages in your copy with the attached, revised pages. Note •...
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Caution on use • Do not allow metal, finger or others to touch the input/output PROHIBITION terminals in the instrument. Otherwise, shock hazard or injury may occur. • Do not smoke nor use a flame near the gas analyzer. Otherwise, a fire may be caused.
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