YOKOGAWA ZR202S User Manual
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YOKOGAWA ZR202S User Manual

Integrated type explosion-proof zirconia oxygen analyzer
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User's
Manual
Model ZR202S
Integrated type Explosion-proof
Zirconia Oxygen Analyzer
IM 11M13A01-04E
IM 11M13A01-04E
6th Edition

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  • Page 1 User’s Manual Model ZR202S Integrated type Explosion-proof Zirconia Oxygen Analyzer IM 11M13A01-04E IM 11M13A01-04E 6th Edition...

  • Page 2: Introduction

    <Introduction> Introduction Thank you for purchasing the ZR202S Integrated type Explosion-proof Zirconia Oxygen Analyzer. Please read the following respective documents before installing and using the ZR202S Integrated type Explosion-proof Zirconia Oxygen Analyzer. The related documents are as follows. General Specifications...

  • Page 3: Contents>

    <Introduction> Models and descriptions in this manual are listed below. Description in this manual Model Product Name Specification Installation Operation Maintenance CMPL ZR202S Integrated type Explosion-proof Zirconia Oxygen Analyzer ZO21R-L Probe Protector ZA8F Flow Setting Unit (for manual calibration use) —...
  • Page 4 <Introduction> ATEX Documentation  This is only applicable to the countries in the European Union. IM 11M13A01-04E...
  • Page 5 CAUTION Requirements for explosion-proof use: The ambient temperature is in the range of -20 to +55ºC. The surface temperature of the ZR202S is not over the temperature class T2 (300ºC)* * The surface temperature of the amplifier box does not exceed 70ºC.
  • Page 6 Every effort has been made to ensure accuracy in the preparation of this manual. However, should any errors or omissions come to the attention of the user, please contact the nearest Yokogawa Electric representative or sales office. • This manual does not cover the special specifications. This manual may not be changed on any change of specification, construction and parts when the change does not affect the functions or performance of the product.
  • Page 7 <Introduction> (3) The following safety symbols are used on the product as well as in this manual. WARNING This symbol indicates that the operator must follow the instructions laid out in this manual in order to avoid the risk of personnel injury electric shock, or fatalities. The manual describes what special care the operator must exercise to avoid such risks.
  • Page 8 <Introduction> Special descriptions in this manual  This manual indicates operation keys, displays and drawings on the product as follows: • Operation keys, displays on the panel Enclosed in [ ]. (Ex. “MODE” key) (Ex. message display → “BASE”) (Ex. data display →...
  • Page 9 viii <Introduction> NOTICE  Specification check When the instrument arrives, unpack the package with care and check that the instrument has not been damaged during transportation. In addition, please check that the specification matches the order, and required accessories are not missing. Specifications can be checked by the model codes on the nameplate.

  • Page 10: Ce Marking Products

    Batteries are included in this product. Batteries incorporated into this product cannot be removed by yourself. Dispose them together with this product. When you dispose this product in the EU, contact your local Yokogawa Europe B.V.office. Do not dispose them as domestic household waste.

  • Page 11: After-Sales Warranty

    In the following cases, customer will be charged repair fee regardless of warranty 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.
  • Page 12 <Introduction> IM 11M13A01-04E...

  • Page 13: Table Of Contents

    Specifications ................... 2-1 General Specifications ..................2-1 2.1.1 Standard Specifications ..............2-1 2.1.2 ZR202S Integrated type Explosion-proof Zirconia Oxygen Analyzer 2-4 2.1.3 ZO21R Probe Protector ..............2-11 ZA8F Flow Setting Unit ................... 2-12 ZO21S Standard Gas Unit ................2-14 Other Equipment ..................... 2-15 2.4.1...
  • Page 14 Cable Specifications ................5-6 5.5.2 Wiring Procedure ................5-7 Components ..................... 6-1 ZR202S Zirconia Oxygen Analyzer ..............6-1 ZA8F Flow Setting Unit, Automatic Calibration Unit ........6-2 Startup ....................... 7-1 Checking Piping and Wiring Connections ............. 7-2 Valve Setup ......................7-2 Supplying Power to Analyzer ................
  • Page 15 Toc-3 <CONTENTS> Confirmation of Equipment Type Setting ............7-8 Selection of Measurement Gas ............... 7-9 Output Range Setting ..................7-9 Checking Current Loop .................. 7-11 Checking Contact I/O ..................7-11 7.9.1 Checking Contact Output ..............7-12 7.9.2 Checking Calibration Contact Output ..........7-13 7.9.3 Checking Contact Input ..............
  • Page 16 Toc-4 <CONTENTS> Calibration ....................9-1 Calibration Briefs ....................9-1 9.1.1 Principle of Measurement ..............9-1 9.1.2 Calibration Gas .................. 9-2 9.1.3 Compensation ..................9-3 9.1.4 Characteristic Data from a Sensor Measured During Calibration ..9-4 Calibration Procedures ..................9-5 9.2.1 Calibration Setting ................
  • Page 17 Toc-5 <CONTENTS> 10.6.4 Treatment After Calibration ............10-21 Inspection and Maintenance ..............11-1 11.1 Inspection and Maintenance of the Detector ..........11-2 11.1.1 Cleaning the Calibration Gas Tube ..........11-2 11.1.2 Replacing the Sensor Assembly ............11-2 11.1.3 Replacement of the Heater Assembly ..........11-5 11.1.4 Replacement of Flame Arrestor Assembly ........
  • Page 18 Blank Page...

  • Page 19: Overview

    Zero gas is fed from a cylinder during calibration. The gas flow is controlled by the ZA8F flow setting unit (for manual valve operation). ZR202S Integrated type Explosion-proof Hazardous Area...

  • Page 20: System 2

    G7003XF/K9473XK, G7004XF/K9473XG Air Set G7013XF, G7014XF Pressure Reducing Valve for Gas Cylinder ZR202A Heater Assembly (Spare Parts for ZR202S) : Items required for the above system example : To be selected depending on each application. For details, refer to corresponding chapter.

  • Page 21: Specifications

    CAUTION Requirements for explosion-proof use: The ambient temperature is in the range of -20 to +55°C. The surface temperature of the ZR202S is not over the temperature class T2 (300°C)(*) (*) The surface temperature of the amplifier box does not exceed 70°C.
  • Page 22 STYLE : Style code AMB. TEMP : Ambient temperature NO. : Serial No. and year of production* 1 Yokogawa Electric Corporation : The manufacturer name Tokyo 180-8750 JAPAN : The manufacturer address* 2 No. KEMA 04ATEX2156 X The country of origin Ex db IIB+H2 T2 Gb, Ex tb IIIC T300°C Db...
  • Page 23 STYLE : Style code AMB. TEMP : Ambient temperature NO. : Serial No. and year of production* 1 Yokogawa Electric Corporation : The manufacturer name Tokyo 180-8750 JAPAN : The manufacturer address* 2 No. IECEx KEM 06.0006X The country of origin Ex db IIB+H2 T2 Gb, Ex tb IIIC T300°C Db...

  • Page 24: Zr202S Integrated Type Explosion-Proof Zirconia Oxygen Analyzer

    Response of 90% within 5 seconds. (Measured after gas is introduced from calibration gas inlet and analog output starts changing.) 2.1.2 ZR202S Integrated type Explosion-proof Zirconia Oxygen Analyzer Can be operated in the field without opening the cover using optical switches. Display:...
  • Page 25 <2. Specifications> Instrument Air System: Pressure; 50 kPa + the pressure inside the furnace 150 kPa + the pressure inside the furnace with automatic calibration unit or check valve. (It is recommended to use air which has been dehumidified by cooling to dew point -20°C or less, and dust or oil mist are removed.) Consumption;...
  • Page 26 <2. Specifications> Display and setting content: Display Related Items: Oxygen concentration (vol%O ), current output value (mA), air ratio, moisture quantify (in hot gases) (vol%H O), cell temperature (°C ), thermocouple reference junction temperature (°C ), maximum/minimum/average oxygen concentration (vol%O ), cell e.m.f.
  • Page 27 <2. Specifications> Calibration: Method; zero/span calibration Calibration mode; Automatic, semi-automatic and manual (All are operated using optical switches). Either zero or span can be skipped. Zero calibration gas concentration setting range; 0.3 to 100 vol%O (in 0.01 vol%O Span calibration gas concentration setting range; 4.5 to 100 vol%O (in 0.01 vol%O Use nitrogen-balanced mixed gas containing 0 to 10 vol%O...

  • Page 28: Standard Accessories

    Output signal limits: 3.8 to 20.5 mA. Specify either /C2 or /C3 option code. When using ZR202S as CE marking compliance product, select -A (ATEX certified flameproof). "-Q" is the explosion-proof type of EAC with Pattern Approval for Russia. "-R" is the explosion-proof type of EAC for Kazakhstan and Belarus.
  • Page 29 <2. Specifications> • External Dimensions ZR202S Integrated type Explosion-proof Zirconia Oxygen Analyzers ±3 ±3 Unit : mm ±2 L (m) tolerance (mm) ±5 ±3 ±2 256.5 ±7 FLANGE ±8 Ø ±3 Rc1/4 or 1/4 NPT (F) ±10 Reference Gas Inlet ±12 ±3...
  • Page 30 2-10 <2. Specifications> • External Dimensions With Automatic Calibration Unit (Horizontal Mount) Unit : mm 348 ±3 AUTOMATIC CALIBRATION UNIT 156 ±3 Display Terminal box Zero gas inlet 66.5 Rc1/4 or 1/4NPT(Female) ● ● Span gas inlet 166.5 Rc1/4 or 1/4NPT(Female) Reference gas inlet Rc1/4 or 1/4NPT(Female) HORIZONTAL INSTALL...

  • Page 31: Zo21R Probe Protector

    2-11 <2. Specifications> 2.1.3 ZO21R Probe Protector Used when sample gas flow velocity is approx. 10 m/sec or more and dust particles wears the detector in cases such as pulverized coal boiler of fluidized bed furnace (or burner) to protect the detector from wearing by dust particles.

  • Page 32: Za8F Flow Setting Unit

    Calibration Gas (zero gas, span gas) Consumption: Approx. 0.7 L/min (at calibration time only) Weight: Approx. 2.3 kg NOTE Use instrument air for span calibration gas, if no instrument air is available, contact YOKOGAWA. Model and Codes Model Suffix code...
  • Page 33 2-13 <2. Specifications> • External Dimensions Unit : mm ø6 Hole REFERENCE CHECK JIS 50A (60.5mm) REFERENCE SPAN ZERO mounting pipe 235.8 222.8 Calibration gas outlet Span gas inlet Reference gas outlet Zero gas inlet Piping connection port A CHECK SPAN ZERO Model Piping connection port A...

  • Page 34: Zo21S Standard Gas Unit

    2-14 <2. Specifications> ZO21S Standard Gas Unit CAUTION Standard Gas Unit (Model ZO21S) must not be located in hazardous area. This is a handy unit to supply zero gas and span gas to the detector as calibration gas. It is used in combination with the detector only during calibration.

  • Page 35: Other Equipment

    2-15 <2. Specifications> Other Equipment 2.4.1 Stop Valve (L9852CB, G7016XH) This valve mounted on the calibration gas line in the system using ZA8F flow setting unit for manual calibration. Standard Specifications Material: 316 SS (JIS) Connection: Rc 1/4 or 1/4 FNPT Weight: Approx.

  • Page 36: Air Set

    2-16 <2. Specifications> 2.4.3 Air Set This set is used to lower the pressure when instrument air is used as the reference and span gases. Standard Specifications • G7003XF, K9473XK Primary Pressure: Max. 1 MPaG Secondary Pressure: 0.02 to 0.2 MPaG Connection: Rc1/4 or 1/4 FNPT (with joint adapter) Weight:...

  • Page 37: Pressure Reducing Valve For Gas Cylinder (G7013Xf, G7014Xf)

    - - - - - - - - - - - Always-A *1 Suffix code of length should be selected as same as ZR202S installed. (Note) The heater is made of ceramic, do not drop or subject it to pressure stress.
  • Page 38 2-18 <2. Specifications> External Dimensions Jig for change Unit : mm (K9470BX) L±12 Model & Codes Weight (kg) ZR202A-040 Approx. 0.8 ZR202A-070 Approx. 1.2 ZR202A-100 1152 Approx. 1.6 ZR202A-150 1652 Approx. 2.2 ZR202A-200 2152 Approx. 2.8 F2-11E.ai IM 11M13A01-04E...

  • Page 39: Installation

    (5) The sample gas satisfies the specifications described in Chapter 2. (6) No sample gas pressure fluctuations. CAUTION • The ambient temperature of the ZR202S Integrated type Explosion-proof Zirconia Oxygen Analyzer should be between - 20°C and 55°C. IM 11M13A01-04E...

  • Page 40: Atex Flameproof Type

    Note 4: Maintenance and Repair • The analyzer modification or parts replacement by other than authorized representative of Yokogawa Electric Corporation is prohibited and will void the certification. Note 5: Cable Entry • The threaded type of cable entry is marked beside the cable entry according to the following markings.

  • Page 41: Fm Explosion-Proof Type

    Figure 3.1 Special fastener 3.1.3 FM Explosion-proof Type ZR202S–B Analyzer for use in hazardous area: Note 1: Applicable Standard: FM3600 1998, FM3615 1989, FM3810 2005, ANSI/NEMA 250 1991 Type of protection: Explosion-proof for Class I, Division 1, Groups B, C and D...

  • Page 42: Csa Explosion-Proof Type

    • Take care not to generate mechanical sparking when accessing to the analyzer and peripheral devices in hazardous area. Note 4: Maintenance and Repair • The analyzer modification or parts replacement by other than authorized representative of Yokogawa Electric Corporation is prohibited and will void Factory Mutual Explosion-proof Approval. 3.1.4 CSA Explosion-proof Type ZR202S–C Analyzer for use in hazardous area:...

  • Page 43: Iecex Flameproof Type

    • Take care not to generate mechanical sparking when accessing to the analyzer and peripheral devices in hazardous area. Note 4: Maintenance and Repair • The analyzer modification or parts replacement by other than authorized representative of Yokogawa Electric Corporation is prohibited and will void Canadian Standards Explosion-proof Certification. 3.1.5 IECEx Flameproof Type ZR202S–D Analyzer for use in hazardous area:...
  • Page 44 <3. Installation> Note 5: Cable Entry • The threaded type of cable entry is marked beside the cable entry according to the following markings. Threaded type Marking M20x1.5 1/2 NPT • In case of ANSI 1/2 NPT plug, ANSI hexagonal wrench should be applied to screw in. •...

  • Page 45: Probe (Detector) Insertion Hole

    <3. Installation> 3.1.6 Probe (Detector) Insertion Hole CAUTION • The outside dimension of the probe may vary depending on its options. Use a pipe that is large enough for the probe. Refer to Subsection 2.1.2 for the dimensions. • If the probe is mounted horizontally, the calibration gas inlet and reference gas inlet should face downwards.

  • Page 46: Installation Of The Probe Protector (Zo21R)

    <3. Installation> 3.1.8 Installation of the Probe Protector (ZO21R) <Analyzer with a probe protector (Model ZO21R-L-- *B for dust wear protect> The probe of the analyzer is used with a probe protector to prevent the sensor from being worn by dust particles when there is a high concentration of dust and gas flow exceeds 10 m/s (fine-carbon boiler or fluid bed furnace).

  • Page 47: Mounting Of Za8F Flow Setting Unit

    <3. Installation> 3.2.2 Mounting of ZA8F Flow Setting Unit The flow setting unit can be mounted either on a pipe (nominal JIS 50A) or on a wall. It should be positioned vertically so that the flowmeter works correctly. <Pipe Mounting> (1) Prepare a vertical pipe of sufficient strength (nominal JIS 50A: O.D.

  • Page 48: Insulation Resistance Test

    3-10 <3. Installation> Insulation Resistance Test Even if the testing voltage is not so great that it causes dielectric breakdown, testing may cause deterioration in insulation and a possible safety hazard. Therefore, conduct this test only when it is necessary. The applied voltage for this test shall be 500 V DC or less.

  • Page 49: Piping

    Do not loosen or remove any Flame Arrestor of gas inlet/outlet during piping. The detector modification or parts replacement by other than authorized representative of Yokogawa Electric Corporation is prohibited and will void ATEX Certification, FM Approval, CSA Certification and IECEx Certification.

  • Page 50: Piping For System 1

    <4. Piping> Piping for System 1 The piping in System 1 is illustrated in Figure 4.1 ZR202S Integrated type Explosion-proof Hazardous Area Non-hazardous Area Zirconia Oxygen Analyzer Stop valve 100 to 240 V AC Contact input Check valve Analog output, contact output...

  • Page 51: Piping For The Calibration Gas Inlet

    Connect the ZA8F flow setting unit and the ZR202S analyzer to a 6 mm (O.D.) x 4 mm (I.D.) (or nominal size 1/4 inches) or larger stainless steel pipe.

  • Page 52: Piping For System 2

    Next check span gas calibration contact output and adjust air set so that span gas flow is within the permitted range. Hazardous Area Non-hazardous Area ZR202S Integrated type Explosion-proof Zirconia Oxygen Analyzer ~ 100 to 240 V AC Automatic...
  • Page 53 <4. Piping> • Installation of Automatic Calibration Unit Horizontal mounting on the ZR202S (-A) Unit: mm AUTOMATIC CALIBRATION UNIT Display Terminal box Zero gas inlet 66.5 Rc1/4 or 1/4NPT(Female) ● ● Span gas inlet 166.5 Reference gas inlet Rc1/4 or 1/4NPT(Female)

  • Page 54: Wiring

    <5. Wiring> Wiring This chapter describes wiring procedures necessary for the EXAxt ZR Integrated type Explosion-proof Zirconia Oxygen Analyzer. General CAUTION Be sure to read Subsections 3.1.2 to 3.1.5 where the important information on wiring is provided. CAUTION • Never supply current to the equipment or any other device constituting a power circuit in combination with the equipment, until all wiring is completed.

  • Page 55: Terminals For The External Wiring

    <5. Wiring> WARNING Cables that withstand temperatures at least 80°C should be used for wiring. NOTE • Select an appropriate cable O.D. for the cable gland size. • Protective grounding should have the grounding resistance of 100 Ω or less. 5.1.1 Terminals for the External Wiring Remove the terminal cover on the opposite side of the display to gain access to the external wiring...

  • Page 56: Wiring

    <5. Wiring> 5.1.2 Wiring Make the following wiring for the equipment. It requires a maximum of four wiring connections as shown below. (1) Analog output signal (2) Power and ground (3) Contact output (4) Contact input Contact output 1 Contact output 2 Contact input 1 Contact input 2 DI-1...

  • Page 57: Wiring For Analog Output

    <5. Wiring> Wiring for Analog Output This wiring is for transmitting 4 to 20 mA DC output signals to a device, e.g. recorder. Maintain the load resistance including the wiring resistance of 550 Ω or less. Analyzer Receiver AO(+) Shielded cables F5-4E.ai Figure 5.4 Wiring for Analog Output...

  • Page 58: Wiring Power And Ground Terminals

    <5. Wiring> Wiring Power and Ground Terminals Wiring for supplying power to the analyzer and grounding the equipment. Ground Grounding to the earth terminal on the equipment case Equipment case Crimp on terminal of Jumper plate the ground wire Lock washer Grounding terminal 100~240 V AC...

  • Page 59: Wiring For Contact Output

    <5. Wiring> Wiring for Contact Output The equipment can output a maximum of two contact signals. These contact outputs can be used for different applications such as a low alarm or high alarm. Do the contact output wiring according to the following requirements. Hazardous Area Non-hazardous Area Analyzer...

  • Page 60: Wiring Procedure

    <5. Wiring> 5.5.2 Wiring Procedure (1) M4 screws are used for the terminal of the analyzer. Each cable should be equipped with the corresponding crimp contact. (2) The ON/OFF level of this contact input is identified by the resistance. Connect a contact input that satisfies the descriptions in Table 5.2.
  • Page 61 Blank Page...

  • Page 62: Components

    <6. Components> Components This chapter describes the names and functions of components for the major equipment of the EXAxt ZR Integrated type Explosion-proof Zirconia Oxygen Analyzer. ZR202S Zirconia Oxygen Analyzer Integrated type Explosion-proof Zirconia Oxygen Analyzer  Terminal box, Explosion-proof...

  • Page 63: Za8F Flow Setting Unit, Automatic Calibration Unit

    <6. Components> ZA8F Flow Setting Unit, Automatic Calibration Unit Reference gas flow setting valve Span gas flow setting valve Zero gas flow setting valve Flowmeter for reference gas Flowmeter for calibration gas F6-2E.ai Figure 6.2 ZA8F Flow Setting Unit Horizontal Vertical mounting mounting...

  • Page 64: Startup

    <7. Startup> Startup The following describes the minimum operating requirements — from supplying power to the analyzer to analog output confirmation to manual calibration. Check piping and Set output ranges wiring connections Set up valves Check current loop Supply power Check contact action Confirm equipment Calibrate analyzer...

  • Page 65: Checking Piping And Wiring Connections

    <7. Startup> Checking Piping and Wiring Connections Refer to Chapters 4 and 5, earlier in this manual, for piping and wiring confirmations. Valve Setup Set up valves and associated components used in the analyzer system in the following procedures: (1) If a stop valve is used in the calibration gas inlet, fully close this valve. (2) If instrument air is used as the reference gas, adjust the Air set secondary pressure so that the air pressure of sample gas pressure plus approx.

  • Page 66: Operation Of Infrared Switch

    <7. Startup> Operation of Infrared Switch 7.4.1 Display and Switches This equipment uses an infrared switch that enables operation with the cover closed. Figure 7.4 shows the infrared switch and the display. Table 7.1 shows the three switch (keys) and functions. 4: Decimal point 1: Data display area µ...

  • Page 67: Display Configuration

    <7. Startup> CAUTION 1. Be sure to put the equipment case cover back on. If this is not done, the infrared switch will not reflect the infrared light-waves, and a “dSPErr” error will be issued. 2. Before placing the equipment in operation, be sure to wipe off any moisture or dust on the glass surface if it is wet or dirty.

  • Page 68: Entering Parameter Code Selection Display

    <7. Startup> Table 7.2 Display Functions Display Function and item to be set Basic panel Displays the oxygen concentration in normal operation, or displays the detector heater temperature while warming up. If an error or alarm arises, the corresponding error or alarm number appears. Password entry Enters the password for the parameter code selection display.

  • Page 69: Selecting Parameter Codes

    <7. Startup> CAUTION • If no key is touched for at least 20 seconds during password entry, the current display will automatically switch to the basic panel display. • If no key is touched for at least 10 minutes during parameter code selection, the current display will automatically switch to the basic panel display.

  • Page 70: Changing Set Values

    <7. Startup> 7.4.5 Changing Set Values (1) Selecting numeric values from among preset values Switch operation Display Description > ∧ The set value is displayed after the parameter code selection. An example of how to select either 0, 1, or 2 as the set value is given below. (The currently set value is 0.) >...

  • Page 71: Confirmation Of Equipment Type Setting

    <7. Startup> Confirmation of Equipment Type Setting This equipment can be used for both the Oxygen Analyzer and the Humidity Analyzer. If you choose optional specification /HS at the time of purchase, the equipment is set for the Humidity Analyzer. Before setting the operating data, be sure to check that the desired model has been set.

  • Page 72: Selection Of Measurement Gas

    <7. Startup> Selection of Measurement Gas Combustion gases contain moisture created by burning hydrogen in the fuel. If this moisture is removed, the oxygen concentration might be higher than before. You can select whether the oxygen concentration in a wet gas is to be measured directly, or compensated for its dry-gas value before use. Use the parameter code [F02] to set the measurement gas.
  • Page 73 7-10 <7. Startup> Table 7.7 Minimum and Maximum Current Setting Procedure Switch operation Display Description > ∧ Display after the password has been entered. > ∧ Set the oxygen concentration at 4 mA. Change the parameter code to C11. Touch the [∧] key to switch to Group C. >...

  • Page 74: Checking Current Loop

    7-11 <7. Startup> Checking Current Loop The set current can be output as an analog output. This enables the checking of wiring between the analyzer and the receiving instrument. Current loop checking is performed using parameter code [G01]. Table 7.8 Checking Current Loop Switch operation Display...

  • Page 75: Checking Contact Output

    7-12 <7. Startup> 7.9.1 Checking Contact Output Follow Table 7.10 to check the contact output. The table uses an example with contact output 1. Table 7.10 Checking Contact Output Switch operation Display Description > ∧ Display after the password has been entered. >...

  • Page 76: Checking Calibration Contact Output

    7-13 <7. Startup> 7.9.2 Checking Calibration Contact Output The calibration contacts are used for the solenoid valve drive signals for the Automatic Calibration Unit. This output signal enables you to check the equipment operation. Check the flowmeter gas flow for that operation. Follow the steps in Table 7.11.

  • Page 77: Checking Contact Input

    7-14 <7. Startup> 7.9.3 Checking Contact Input Follow Table 7.12 to check the contact input. The table uses an example with contact input 1. Table 7.12 Checking Contact Input Switch operation Display Description > ∧ Display after the password has been entered. >...

  • Page 78: Calibration

    7-15 <7. Startup> 7.10 Calibration The analyzer is calibrated in such a way that the actual zero and span gases are measured and those measured values are used to agree with the oxygen concentrations in the respective gases. There are three types of calibration procedures available: (1) Manual calibration conducting zero and span calibrations, or either of these calibrations in turn.
  • Page 79 7-16 <7. Startup> Table 7.14 Calibration Setup Procedure Switch operation Display Description > ∧ Display after the password has been entered. > ∧ Set the zero gas concentration. Switch the parameter code to B01. Here, set 0.98%. > ∧ 001.00 Touch the [ENT] key to display the currently set value.

  • Page 80: Manual Calibration

    7-17 <7. Startup> 7.10.2 Manual Calibration The following describes how to conduct a calibration. Preliminary Before conducting a manual calibration, be sure that the ZA8F Flow Setting Unit zero gas flow valve is fully closed. Open the zero gas cylinder pressure reducing value so that the secondary pressure will be a sample gas plus approx.
  • Page 81 7-18 <7. Startup> Switch operation Display Description > ∧ ZEro If you touch the [ENT] key again, the flashing stops and “ZEro Y” appears. Close the span gas flow valve. Secure the span gas lock nut for leakage. If the automatic calibration unit is connected, close the span gas solenoid valve.

  • Page 82: Detailed Data Setting

    <8. Detailed Data Setting> Detailed Data Setting Setting Display Item Display items are defined as items displayed on the basic panel display. Parameter code [A00] or [F08] is used to set the display items as shown in Table 8.1. The oxygen concentration is set at the factory before shipment.

  • Page 83: Setting Minimum Oxygen Concentration ( At 4 Ma) And Maximum Oxygen Concentration ( At 20 Ma)

    <8. Detailed Data Setting> 8.2.1 Setting Minimum Oxygen Concentration ( at 4 mA) and Maximum Oxygen Concentration ( at 20 mA) Set the oxygen concentration values at 4 mA and 20 mA. The minimum concentration of oxygen for the minimum current (4 mA) is 0%O or 6% to 76%O The maximum concentration of oxygen for the maximum current (20 mA) ranges from 5% to 100% , and must be greater than 1.3 times the concentration of oxygen set for the minimum.

  • Page 84: Output Hold Setting

    <8. Detailed Data Setting> Output Hold Setting The “output hold” functions retain an analog output signal at a preset value during the equipment’s warm-up time or calibration or if an error arises. Table 8.4 shows the analog outputs that can be retained and the individual states. Table 8.4 Analog Output Hold Setting Equipment...
  • Page 85 <8. Detailed Data Setting> Switch operation Display > ∧ > ∧ > ∧ > ∧ SPAn > ∧ 21.00 > ∧ OPEn/20.84 > ∧ 20.84 > ∧ ZEro > ∧ 0.98 Output hold time during calibration > ∧ OPEn/0.89 > ∧...

  • Page 86: Preference Order Of Output Hold Value

    <8. Detailed Data Setting> 8.3.2 Preference Order of Output Hold Value The output hold value takes the following preference order: During error occurrence During calibration Preference order (high) During maintenance During warm-up 8.3.2E.siki For example, if the current output is set to “4 mA” during maintenance, and “without hold” output during calibration is preset, the output is held at 4 mA in the maintenance display.

  • Page 87: Oxygen Concentration Alarms Setting

    <8. Detailed Data Setting> Oxygen Concentration Alarms Setting The analyzer enables the setting of four alarms ― high-high, high, low, and low-low alarms ― depending upon the oxygen concentration. The following section sets forth the alarm operations and setting procedures. 8.4.1 Setting the Alarm Values (1) High-high and high alarm values...

  • Page 88: Alarm Setting

    <8. Detailed Data Setting> In the example in Figure 8.2, the high alarm point is set to 7.5vol%O , the delayed time is set to five seconds, and hysteresis is set to 2vol%O Alarm output actions in this figure are expressed as follows: A.

  • Page 89: Default Values

    <8. Detailed Data Setting> 8.4.4 Default Values When the analyzer is delivered, or if data are initialized, the default alarm set values are as shown in Table 8.8. Table 8.8 Alarm Setting Default Values Set item Set value High-high alarm setpoint 100%O High alarm setpoint 100%O...

  • Page 90: Setting Contact Output

    <8. Detailed Data Setting> 8.5.2 Setting Contact Output Set the contact outputs following Table 8.10. Table 8.10 Parameter Codes for Contact Output Setting Set item Parameter code Set value Contact output 1 Operation Operated in closed status. (Normally de-energized) Operated when open. (Normally energized) (Note 1) Error...
  • Page 91 8-10 <8. Detailed Data Setting> WARNING • Contact output 2 is linked to the detector’s heater power safety switch. As such, if contact output 2 is on, the heater power stops and an Err-01 (cell voltage abnormal) or Err-02 (heater temperature abnormal) occurs.

  • Page 92: Default Values

    8-11 <8. Detailed Data Setting> Contact Input Setting The analyzer contact inputs execute set functions by accepting a remote (contact) signal. Table 8.12 shows the functions executed by a remote contact signal. Table 8.12 Contact Input Functions Set item Function Calibration gas pressure While a contact signal is on, neither semi-automatic nor automatic calibrations decrease...

  • Page 93: Other Settings

    8-12 <8. Detailed Data Setting> Other Settings 8.7.1 Setting the Date-and-Time The following describe how to set the date-and-time. Automatic calibration works following this setting. Use parameter code [F10] to set the date-and-time. Table 8.14 Data-and-time Settings Switch operation Display Description >...

  • Page 94: Setting Periods Over Which Average Values Are Calculated And Periods Over Which Maximum And Minimum Values Are Monitored

    8-13 <8. Detailed Data Setting> 8.7.2 Setting Periods over which Average Values are Calculated and Periods over which Maximum and Minimum Values Are Monitored The equipment enables the display of oxygen concentration average values and maximum and minimum values under measurement (see Subsection 10.1.1, later in this manual). The following section describes how to set the periods over which oxygen concentration average values are calculated and maximum and minimum values are monitored.

  • Page 95: Setting Fuels

    8-14 <8. Detailed Data Setting> 8.7.3 Setting Fuels Input Parameters The analyzer calculates the moisture content contained in exhaust gases. The following sets forth the fuel parameters necessary for calculation and their entries. The moisture quantity may be mathematically expressed by: (water vapor caused by combustion and water vapor contained in the exhaust gas) + (water vapor contained in air for combustion) Moisture quantity =...
  • Page 96 8-15 <8. Detailed Data Setting> For liquid fuel Amount of water vapor in exhaust gas (Gw) = (1/100) {1.24 (9h + w)} [m /kg] Theoretical amount of air (Ao) = {(12.38 / 10000) x H1} – 1.36 [m /kg] Low calorific power = H1 X value = {(3.37 / 10000) x Hx} –...
  • Page 97 8-16 <8. Detailed Data Setting> 0.046 0.044 0.042 0.040 0.038 0.036 0.034 0.032 0.030 0.028 Wet-bulb 0.026 Absolute temperature, °C humidity, kg/kg 0.024 0.022 0.020 0.018 0.016 0.014 0.012 0.010 0.008 0.006 0.004 0.002 0.000 38 40 12 14 16 18 20 22 24 26 28 30 32 34 36 F8-4E.ai...
  • Page 98 8-17 <8. Detailed Data Setting> Table 8.16 Fuel Data • For liquid fuel Fuel Chemical component Amount of combustion Calorific power Theoretical Specific properties amount of (weight percentage) gas Nm kJ/kg weight value air for kg/l combustion Type Higher Lower Total O SO content...

  • Page 99: Setting Purging

    8-18 <8. Detailed Data Setting> Procedure Use the parameter code table below to set fuel values. Table 8.17 Setting Fuel Values Set item Parameter code Set value Engineering units Amount of water vapor in 0 to 5 /kg (m exhaust gas Theoretical amount of air 1 to 20 /kg (m...

  • Page 100: Calibration

    <9. Calibration> Calibration Calibration Briefs 9.1.1 Principle of Measurement This subsection sets forth the principles of measurement with a zirconia oxygen analyzer before detailing calibration. A solid electrolyte such as zirconia allows the conductivity of oxygen ions at high temperatures. Therefore, when a zirconia-plated element with platinum electrodes on both sides is heated up in contact with gases having different oxygen partial pressures on each side, the element shows the action of the concentration cell.

  • Page 101: Calibration Gas

    <9. Calibration> 0.51 vol%O ,81.92mV(Zero origin of calibration) Cell voltage (mV) 21.0 vol%O , 0mV (Span origin of calibration) 21.0 Oxygen concentration (vol % O F9-1E.ai Figure 9.1 Oxygen Concentration in a Measurement Gas vs. Cell Voltage (21 vol%O Equivalent) The measurement principles of a zirconia oxygen analyzer have been described above.

  • Page 102: Compensation

    <9. Calibration> 9.1.3 Compensation The deviation of a measured value from the theoretical cell electromotive force is checked by the method in Figure 9.2 or 9.3. Figure 9.2 shows a two-point calibration using two gases: zero and span. Cell electromotive forces for a span gas with an oxygen concentration p1 and a zero gas with an oxygen concentration p2 are measured while determining the calibration curve passing between these two points.

  • Page 103: Characteristic Data From A Sensor Measured During Calibration

    <9. Calibration> 9.1.4 Characteristic Data from a Sensor Measured During Calibration During calibration, calibration data and sensor status data (listed below) are acquired. However, if the calibration is not properly conducted (an error occurs in automatic or semi-automatic calibration), these data are not collected in the current calibration. These data can be observed using parameter codes [A20] to [A22], and [A50] to [A79].

  • Page 104: Calibration Procedures

    <9. Calibration> Calibration Procedures CAUTION Calibration should be made under normal operating conditions (if the probe is connected to a furnace, the analyzer will undergo calibration under the operating conditions of the furnace). To make a precise calibration, conduct both zero and span calibrations. 9.2.1 Calibration Setting The following sets forth the required calibration settings:...
  • Page 105 <9. Calibration> CAUTION When instrument air is used for the span calibration, remove the moisture from the instrument air at a dew-point temperature of -20°C and also remove any oily mist and dust from that air. If dehumidifying is not enough, or if foul air is used, the measurement accuracy will be adversely affected.
  • Page 106 <9. Calibration> Setting When setting calibration timing requirements, bear the following precautions in mind: NOTE If the calibration interval is shorter than the sum of hold (output stabilization) time plus calibration time, the second calibration start time will conflict with the first calibration. In such a case, the second calibration will not be conducted.

  • Page 107: Calibration

    <9. Calibration> 9.2.2 Calibration Manual Calibration For manual calibration, consult Section 7.10, “Calibration,” earlier in this manual. Semi-automatic Calibration (1) Calibration startup using infrared switches Table 9.3 Semi-automatic Calibration Procedure Switch operation Display Description > ∧ Change the parameter code to b11. (Previous operations omitted) >...

  • Page 108: Other Functions

    10-1 <10. Other Functions> 10. Other Functions 10.1 Detailed Display Select the desired parameter code to display the detailed operation data (see Table 10.1, “Parameter Codes for Detailed Operation Data”). NOTE Refer to Section 8.1, “Setting Display Item”, for parameter code [A00]. IM 11M13A01-04E...
  • Page 109 10-2 <10. Other Functions> Table 10.1 Parameter Codes for Detailed Operation Data Engineering Engineering Code Item Code Item unit unit Selection 0 Oxygen concentration Span correction ratio 0 of display 1 Oxygen analyzer (0.0) Span correction ratio 1 items 2 Oxygen analyzer (0.0) Span correction ratio 2 3 Analog output selected Span correction ratio 3...

  • Page 110: Air Ratio

    10-3 <10. Other Functions> 10.1.1 Air Ratio “Air ratio” is defined as the ratio of (the amount of air theoretically required to completely burn all the fuel) to (the amount of air actually supplied). For this equipment, the air ratio will be obtained in a simplified way by measuring the oxygen concentration in the exhaust gas.

  • Page 111: Cell Voltage

    10-4 <10. Other Functions> 10.1.5 Cell Voltage The cell (sensor) voltage will be an index to determine the amount of degradation of the sensor. The cell voltage corresponds to the oxygen concentration currently being measured. If the indicated voltage approximates the ideal value (corresponding to the measured oxygen concentration), the sensor will be assumed to be normal.

  • Page 112: Response Time

    10-5 <10. Other Functions> 10.1.9 Response Time The cell’s response time is obtained in the procedure shown in Figure 10.1. If only either zero or span calibration has been carried out, the response time will not be measured just as it will not be measured in manual calibration.

  • Page 113: Heater On-Time Ratio

    10-6 <10. Other Functions> 10.1.12 Heater On-Time Ratio The probe sensor is heated to and maintained at 750°C. When the sample gas temperature is high, the amount of heater ON-time decreases. 10.1.13 Oxygen Concentration (with time constant) When the output damping is specified in the mA-output range setting, the corresponding time constant is also displayed.

  • Page 114: History Of Calibration Time

    10-7 <10. Other Functions> 81.92 Zero origin Calibration curve Cell before correction electromotive Previous force, mV zero gas data Corrected calibration curve (theoretical calibration curve) Span origin 21.0 0.51 F10-2E.ai Span gas concentration Oxygen concentration (vol%O Zero correction ratio = (B/A) x 100 (%) Correctable range: 100 ±...

  • Page 115: Operational Data Initialization

    10-8 <10. Other Functions> 10.2 Operational Data Initialization Individual set data initialization enables you to return to the default values set at the time of delivery. There are two types of initializations: an all set-data initialization and a parameter-code-based initialization. Table 10.4 lists the initialization items by a parameter code, and default values. Table 10.4 Parameter Codes for Initialization Parameter code...

  • Page 116: Initialization Procedure

    10-9 <10. Other Functions> 10.3 Initialization Procedure Follow the table below to initialize parameters. The password for initialization is 1255. Table 10.5 Initialization Procedure Switch operation Display Description > ∧ Enter the parameter code for the item to be initialized. The following show an example of entering “F30.”...

  • Page 117: Reset

    10-10 <10. Other Functions> 10.4 Reset Resetting enables the equipment to restart. If the equipment is reset, the power is turned off and then back on. In practical use, the power remains on, and the equipment is restarted under program control.
  • Page 118 10-11 <10. Other Functions> Table 10.6 Resetting Switch operation Display Brief Description > ∧ Err-01 If an error occurs, the error number and “------” are displayed alternately, /------ as given on the left. > ∧ PASSno Hold down the [ENT] key for at least three seconds. >...
  • Page 119 10-12 <10. Other Functions> CAUTION • Parameters of blank item are not used for Oxygen Analyzer. Table 10.7 Parameter Codes Display-related Items in Group A Engineering Engineering Code Item Code Item unit unit Selection 0 Oxygen concentration Span correction ratio 0 of display 1 Oxygen analyzer (0.0) Span correction ratio 1...
  • Page 120 10-13 <10. Other Functions> Calibration-related Items in Group B Code Item Tuning Engineering unit Default setting Zero gas concentration 0.3 to 100 Span gas concentration 4.5 to 100 21%O Calibration mode 0 Manual calibration Manual calibration 1 Semi-automatic and manual calibration 2 Automatic, semi-automatic, and manual calibration...
  • Page 121 10-14 <10. Other Functions> Output-related Items in Group C Code Item Tuning Engineering unit Default setting Analog output 0 Oxygen concentration Oxygen concentration 1 Amount of moisture content 2 Mixed ratio Output mode 0 Linear Linear 1 Logarithm Output hold during 0 4 mA 4 mA warm-up...
  • Page 122 10-15 <10. Other Functions> Contact-related Items in Group E Code Item Tuning Engineering unit Default setting Selection of contact input 1 0 Invalid Invalid 1 Calibration gas pressure decrease 2 Measurement range change 3 Calibration start 4 Detection of non-combusted gas Selection of contact input 2 0 Invalid Invalid...
  • Page 123 10-16 <10. Other Functions> Equipment Setup and Others in Group F Code Item Tuning Engineering unit Default setting Equipment setup 0 Oxygen analyzer Oxygen analyzer 1 Humidity analyzer Selection of measurement 0 Wet 1 Dry Selection of temperature 0 degree C units 1 degree F degree C...

  • Page 124: Handling Of The Zo21S Standard Gas Unit

    10-17 <10. Other Functions> 10.5 Handling of the ZO21S Standard Gas Unit WARNING Use only non-hazardous area. The following describes how to flow zero and span gases using the ZO21S Standard Gas Unit. Operate the ZO21S Standard Gas Unit, for calibrating a system classified as System 1, according to the procedures that follow.

  • Page 125: Installing Gas Cylinders

    10-18 <10. Other Functions> 10.5.2 Installing Gas Cylinders Each ZO21S Standard Gas Unit comes with six zero gas cylinders including a spare. Each gas cylinder contains 7-liters of gas with a 0.95 to 1.0 vol%O (concentration varies with each cylinder) and nitrogen, at a pressure of 700 kPaG (at 35°C).
  • Page 126 10-19 <10. Other Functions> <Flow of span gas (air)> The standard gas unit is used only when manual calibration is employed. Therefore, the timing for flowing span gas (air) is included in the manual calibration flowchart described in Subsection 7.10.2, earlier in this manual. For operation of the analyzer, see Subsection 7.10.2.
  • Page 127 10-20 <10. Other Functions> WARNING Store the standard gas unit with the gas cylinder mounted where the ambient temperature does not exceed 40°C. Otherwise, the gas cylinder may explode. Store the spare gas cylinders under the same condition. IM 11M13A01-04E...

  • Page 128: Methods Of Operating Valves In The Za8F Flow Setting Unit

    10-21 <10. Other Functions> 10.6 Methods of Operating Valves in the ZA8F Flow Setting Unit The ZA8F Flow Setting Unit is used as the calibration equipment for a system conforming to System 2. Calibration in such a system is to be manually operated. So, you have to operate the valve of the Flow Setting Unit each time calibration is made (starting and stopping the calibration gas flow and adjusting the flow rate).
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  • Page 130: Inspection And Maintenance

    When checking the detector, carefully observe the following: • The instrument modification or parts replacement by other than authorized representative of Yokogawa Electric Corporation is prohibited and will void ATEX Flameproof approval, Factory Mutual Explosion-proof approval and Canadian Standards Explosion-proof certification. •...

  • Page 131: Inspection And Maintenance Of The Detector

    11-2 <11.Inspection and Maintenance> 11.1 Inspection and Maintenance of the Detector 11.1.1 Cleaning the Calibration Gas Tube The calibration gas, supplied through the calibration gas inlet of the terminal box into the detector, flows through the tube and comes out at the tip of the probe. The tube might become clogged with dust from the sample gas.
  • Page 132 11-3 <11. Inspection and Maintenance> CAUTION • If the sensor assembly is to be replaced, allow enough time for the detector to cool down from its high temperature. Otherwise, you may get burned. • If the cell assembly is to be replaced, be sure to replace the metal O-ring and the contact together.
  • Page 133 11-4 <11.Inspection and Maintenance> 1. Identifying parts to be replaced In order not to lose or damage disassembled parts, identify the parts to be replaced from among all the parts in the sensor assembly. Normally, replace the sensor (cell), metal O-ring and contact together at the same time.

  • Page 134: Replacement Of The Heater Assembly

    11-5 <11. Inspection and Maintenance> 11.1.3 Replacement of the Heater Assembly This subsection describes the replacement procedure for the heater assembly. The sensor or ceramic heater-furnace core internal structure is subject to fracturing, so do NOT subject it to strong vibrations or shock. Additionally, the heater assembly reaches high temperatures and is subjected to high voltages.
  • Page 135 11-6 <11.Inspection and Maintenance> View A-A F11-4E.ai Figure 11.4 Exploded View of Detector IM 11M13A01-04E...

  • Page 136: Replacement Of Flame Arrestor Assembly

    If the flame arrestor assembly is clogged with dust, replace it with new one or wash it. In case of the ATEX flameproof model (MS Code: ZR202S-A-...) or IECEx flameproof model (MS Code: ZR202S-D-...), the flame arrestor assembly...

  • Page 137: Replacement Of O-Ring

    11-8 <11.Inspection and Maintenance> Apply adhesive here Detector Detector Flame Arrestor Assembly Flame Arrestor Assembly F11-5E.ai Figure 11.5 Removal of Flame Arrestor 11.1.5 Replacement of O-ring The detector uses three different types of O-rings , and Two O-ring of each type. 11.1.6 Stopping and Re-starting Operation <Stopping Operation>...

  • Page 138: Inspection And Maintenance Of The Analyzer

    11-9 <11. Inspection and Maintenance> 11.2 Inspection and Maintenance of the Analyzer The converter does not require routine inspection and maintenance. If the converter does not work properly, in most cases it probably comes from problems or other causes. Replacing Fuses ...
  • Page 139 11-10 <11.Inspection and Maintenance> (7) To restore the electronics, reverse the above removal procedures. When restoring the electronics, do not get lead wire jammed in any part of the unit. (8) Place the electronics and the printed-circuit board on which the fuse is installed properly; these are directly connected with connectors.

  • Page 140: Replacement Of Flowmeter For Automatic Calibration Unit

    WARNING Do not loosen or remove any Flame Arrestor of gas inlet/outlet during piping. The detector modification or parts replacement by other than authorized representative of Yokogawa Electric Corporation is prohibited and will void ATEX Flameproof Certification, FM Explosion-proof Approval and CSA Explosion-proof Certification.
  • Page 141 Blank Page...

  • Page 142: Troubleshooting

    12-1 <12. Troubleshooting> 12. Troubleshooting This chapter describes errors and alarms detected by the self-diagnostic function of the converter. It also describes the check and remedies when problems other than the above occur. 12.1 Displays and Remedies When Errors Occur 12.1.1 Error Types An error is detected if any abnormality is generated in the detector or the converter, e.g., in the cell (sensor) or heater in the detector, or the internal circuits in the converter.

  • Page 143: Remedies When An Error Occurs

    5) Remove the probe to gain access to the two connectors (four connectors for the optional automatic calibration unit), as indicated in Figure 12.2. Check these connectors are properly connected. 6) If Err-01 still occurs, the electronics may be defective. Contact your local Yokogawa service or sales representative. Err-02: Heater Temperature Failure This error occurs if the detector heater temperature does not rise during warm-up, or if the temperature falls below 730°C or exceeds 780°C after warm-up is completed.
  • Page 144 (Ω) F12-3E.ai Figure 12.3 (4) If the inspection indicates that the thermocouple is normal, the electronics may be defective. Consult your local Yokogawa service or sales representative. Err-03: A/D Converter Failure/Err-04: Writing-to-memory Failure A/D Converter Failure • It is suspected that a failure has occurred in the A/D converter mounted in the electrical circuits inside the converter.

  • Page 145: Displays And Remedies When Alarms Are Generated

    12-4 <12. Troubleshooting> 12.2 Displays and Remedies When Alarms are Generated 12.2.1 Alarm types When an alarm is generated, the alarm indication blinks in the display to notify of the alarm (Figure 12.4). Alarms include those shown in Table 12.2. Displayed alternately AL-06 21.0%...

  • Page 146: Remedies When Alarms Are Generated

    12-5 <12. Troubleshooting> 12.2.2 Remedies When Alarms are Generated AL-01: Oxygen Concentration Alarm This alarm is generated when a measured value exceeds an alarm set point or falls below it. For details on the oxygen concentration alarm, see Section 8.4, “Oxygen Concentration Alarms Setting,” in the chapter on operation.
  • Page 147 12-6 <12. Troubleshooting> (6) If the cell assembly has been gradually deteriorating, check the cell assembly status in the following procedure: a. Display “Cell resistance” by specifying the parameter code A21. A new cell will show a cell resistance value of 200 Ω or less. On the other hand, a cell (sensor) that is approaching the end of its service life will show a resistance value of 3 to 10 kΩ.
  • Page 148 If this alarm occurs even when the ambient temperature is under 55°C, the electronics may be defective. Contact your local Yokogawa service or sales representative. AL-11: Thermocouple Voltage Alarm This alarm is generated when the e.m.f.
  • Page 149 10 Ω or less. (4) If there is no failure in the wiring, the electrical circuits inside the converter may possibly fail. Contact the service personnel at Yokogawa Electric Corporation. AL-13: Battery Low Alarm An internal battery is used as backup for the clock.

  • Page 150: Measures When Measured Value Shows An Error

    12-9 <12. Troubleshooting> 12.3 Measures When Measured Value Shows an Error The causes that the measured value shows an abnormal value is not always due to instrument failures. There are rather many cases where the causes are those that measuring gas itself is in abnormal state or external causes exist, which disturb the instrument operation.

  • Page 151: Measured Value Lower Than True Value

    12-10 <12. Troubleshooting> 12.3.2 Measured Value Lower Than True Value <Causes and Measures> (1) The measuring gas pressure becomes lower. Where an increment of the measured value due to pressure change cannot be neglected, take measures referring to Subsection 12.3.1 (1). (2) Moisture content in a reference gas changes (decreases) greatly.

  • Page 152: Customer Maintenance Parts List

    K9470ZK Cal. Gas Tube Assembly K9470ZL Cal. Gas Tube Assembly for Option code "/C" CMPL 11M13A01-04E All Rights Reserved, Copyright © 2004, Yokogawa Electric Corporation. Subject to change without notice. 1st Edition : Jun. 2004(YK) 4th Edition : Feb. 2016(YK)
  • Page 154 Hood for ZR202S ZR202G_F.ai Item Part No. Description K9472UF Hood Automatic Calibration Unit SPAN IN REF IN ZERO IN Item Part No. Description K9473XC Flowmeter CMPL 11M13A01-04E 4th Edition : Feb. 2016 (YK)

  • Page 156: Customer Maintenance Parts List

    Table 1 Power Pump AC 100 V E7050AU AC 200 V E7050AV CMPL 11M3D1-01E All Rights Reserved, Copyright © 2000, Yokogawa Electric Corporation. Subject to change without notice. 1st Edition : Jan. 2000 (YK) 4th Edition : Mar. 2011 (YK)

  • Page 158: Revision Information

    “WARNING”: Deleted description. 2.1.2 “ZR202S Integrated-type Explosion-proof Oxygen Analyzer”: Added Applicable Standard and Certificate. “ZR202S Integrated-type Explosion-proof Oxygen Analyzer” Safety and EMC conforming standards: Added Caution. “ZR202S Integrated-type Explosion-proof Oxygen Analyzer” Model and Suffix Codes: Added one suffix code, Added Note.
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