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Michell Instruments XZR200 User Manual

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XZR200
Oxygen Analyzer
User's Manual
97337 Issue 4
July 2018

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Summary of Contents for Michell Instruments XZR200

  • Page 1 XZR200 Oxygen Analyzer User’s Manual 97337 Issue 4 July 2018...
  • Page 2 Please fi ll out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Instrument Code Serial Number Invoice Date Location of Instrument Tag No Instrument Code Serial Number Invoice Date...
  • Page 3 © 2018 Michell Instruments This document is the property of Michell Instruments Ltd. and may not be copied or otherwise reproduced, communicated in any way to third parties, nor stored in any Data Processing System without the express written authorization of Michell Instruments Ltd.

  • Page 4: Table Of Contents

    Features ......................1 Description ....................... 2 OPERATION ......................3 Confi guration ....................3 Initial Sensor Drift and Active Burn-In ..............4 XZR200 Variations ....................5 Life Span of the Analyzer ..................5 INSTALLATION ....................6 Mounting and Orientation..................6 3.1.1 Ambient Monitoring ..................7 Electrical Connections ..................
  • Page 5 XZR200 User’s Manual Figures Figure 1 Jumper Confi guration for Output Selection ...........3 Figure 2 Jumper Confi guration for Calibration Type & Range Selection ......4 Figure 3 Mounting and Orientation ................6 Figure 4 Electrical Connections .................7 Figure 5 System Block Diagram ................8 Figure 6 COM Port Settings ..................8...

  • Page 6: Safety

    The input power supply voltage limit is 24 V ±10%. Pressure Safety The XZR200 is designed to be operated at atmospheric pressures. However, it is possible to measure in the range 0 to 25% O at pressures up to 5 barg (72.5 psig) without damage to the unit.

  • Page 7: Abbreviations

    XZR200 User’s Manual Abbreviations The following abbreviations are used in this manual: °C degrees Celsius °F degrees Fahrenheit direct current European Union kilogram(s) l/min liters per minute pound milliampere maximum minute(s) scfh standard cubic feet per hour cycle time to evacuate and re-pressurize the sealed cell...

  • Page 8: Introduction

    The XZR200 measures the partial pressure of O utilizing a Zirconium Dioxide (ZrO sensor cell in Safe Area (general purpose) applications. This user manual will show you how to measure oxygen using the XZR200 oxygen analyzer. In the following sections you will learn about: •...

  • Page 9: Description

    (+752°F). The XZR200 is particularly suitable for measuring oxygen in areas that are not easily accessible, or in closed systems such as ventilation pipes, fl ues and containers. The XZR200 can be user-confi gured to output measuring ranges of 0 to 25% O 0-100% O .

  • Page 10: Operation

    INSTALLATION OPERATION The XZR200 is designed as a fi t and forget device. Once confi gured, installed and all electrical connections made, there are no further operating instructions required. Only routine inspection and calibration of the unit is required. The inspection is more a preventative measure to ensure the surrounding environment or any other factor is not damaging or interfering with the performance of the analyzer.

  • Page 11: Initial Sensor Drift And Active Burn-In

    XZR200 User’s Manual INSTALLATION Using the jumper settings shown below, both the measurement range and the calibration option can be set. The following options are available: Measuring range: 0-25% or 0-100% Calibration: Auto cal or manual calibration AUTO CAL MANUAL CAL...

  • Page 12: Xzr200 Variations

    XZR200 User’s Manual INSTALLATION XZR200 Variations The XZR200 will be set-up as one of the following variations (as per customer order): XZR200-B1-C1 XZR200, standard temperature up to +250ºC (+482ºF) 210mm (8.27") probe XZR200-B1-C2 XZR200, standard temperature up to +250ºC (+482ºF) 400mm (15.74") probe...

  • Page 13: Installation

    The XZR200 should be grounded (earthed) via the probe as well as through the cable. When using the XZR200 in a combustion process the diagram below shows the correct mounting and orientation. The downward angle of the probe tip will protect the sensor from dust settling or moisture sitting in the tip and damaging the sensor.

  • Page 14: Ambient Monitoring

    XZR200 User’s Manual INSTALLATION 3.1.1 Ambient Monitoring When used for ambient monitoring or confi ned spaces, there are two holes on the rear of the electronics case that can be utilized for mounting (see Dimensions in Appendix A). If placed tight against a wall or surface, a heat shield may be required to protect the surface from being damaged.

  • Page 15: System Block Diagram

    System Block Diagram RS232 Communication Settings When connecting the XZR200 via the RS232 connections, ensure Tx goes to Rx of the PC and Rx goes to Tx of the PC. The XZR200 communicates via standard COM port settings that are default on most PC's and many other RS232 compatible devices.

  • Page 16: Rs232 Operation

    Changing the Menu Access Password The password is factory set to ‘default’. However this may be changed to a user specifi c password. Connect the XZR200 via the RS232 interface to the PC. ENTER Press then enter your current security password.

  • Page 17: Variable Output Filtering (Td Averaging)

    To convert the XZR200 Td output back to ms the number must be multiplied by 0.000048 which is the clock period of the microprocessor in seconds. So for the example above a Td value of 217.5ms would be output from the XZR200 as, 0.2175/0.000048 = 4531.

  • Page 18: Adjusting The Minimum And Maximum Ranges Of The Analog Outputs

    Ensure the XZR200 is confi gured for 0 to 100% and RS232 operation. See Section 2.1 on Confi guration. Connect the XZR200 via the RS232 interface to the PC.

  • Page 19: Continuous Data Streaming

    XZR200 User’s Manual OPERATION Continuous Data Streaming On power up, after the initial 60 seconds warm up period, the XZR200 will automatically begin to output the measured O concentration and sensor Td as both an averaged and raw value. The sensor Td value is the measure of the partial pressure of oxygen in the measurement gas.

  • Page 20: Calibration

    Calibration is complete. Calibration values are retained on power loss. Manual Calibration Ensure the XZR200 is confi gured for manual calibration. See Section 2.1 on Confi guration. Place the sensor probe in the calibration gas, typically normal air. Allow the output to stabilize for at least 5 minutes. Allow 10 minutes if powering from cold.

  • Page 21: Good Measurement Practice

    XZR200 User’s Manual GOOD MEASUREMENT PRACTICE GOOD MEASUREMENT PRACTICE There are no user-serviceable parts in the XZR200. In the event of a repair or warranty case, please return the unit, suitably packaged with a decontamination certifi cate, to Michell's Service Department.

  • Page 22: Protecting From Water Droplets

    XZR200 User’s Manual GOOD MEASUREMENT PRACTICE 5.2.2 Protecting from Water Droplets In environments where falling water droplets are likely, the sensor should be protected from water falling directly onto the very hot sensor cap as this can cause massive temperature shocks to the cell and heater. Popular methods include a hood over the sensor cap or for the sensor to be mounted in a larger diameter cylinder.

  • Page 23: Using The Sensor With Silicones

    5.2.4 Using the Sensor with Silicones The XZR200 oxygen sensor, like all other Zirconium Dioxide sensors, will be damaged by silicon presence in the measurement gas. Vapors (organic silicone compounds) of RTV rubbers and sealants are widely used in many applications. These materials, which are often applied as a liquid or gel, still release silicone vapors into the surrounding atmosphere even after they have cured.
  • Page 24 XZR200 User’s Manual CALIBRATION Appendix A Technical Specifi cations Michell Instruments...

  • Page 25: Appendix A Technical Specifi Cations

    Housing Material Waterproof die-cast aluminum housing * The XZR200 is designed to be operated at atmospheric pressures. However, it is possible to measure in the range 0 to 25% O at pressures up to 3 barg (43.5 psig) without damage to the unit.
  • Page 26 XZR200 User’s Manual APPENDIX A Dimensions 80mm 210 or 400mm 52mm (3.15”) (8.27 or 15.75”) (2.05”) Top View Side View Mounting Holes ø 4.5mm (ø 0.18”) (x 2) Mounting holes accessible on removal of housing lid Bottom View 52.4mm (2.06”)
  • Page 27 XZR200 User’s Manual APPENDIX B Appendix B Theory of Operation 97337 Issue 4, July 2018...

  • Page 28: Appendix B Theory Of Operation

    XZR200 User’s Manual APPENDIX B Appendix B Theory of Operation The sensor employs a well proven, small Zirconium Dioxide based element at its heart that does not require a reference gas. This removes limitations in the environments in which the sensor can be operated with high temperatures, humidity and oxygen pressures all possible.
  • Page 29 Chamber Platinum Ring At the core of the XZR200 oxygen analyzer is a cell consisting of two Zirconium Dioxide (ZrO ) squares coated with a thin porous layer of platinum which serve as electrodes. The platinum electrodes provide the catalyst necessary for the measured oxygen to...
  • Page 30 XZR200 User’s Manual APPENDIX B COMMON PARTIAL PRESSURE TO BE MEASURED) (CHAMBER PRESSURE) SENSE SENSE PUMP Sensing Plate: A difference in oxygen pressure across the second ZrO square generates a Nernst voltage which is logarithmically proportional to the ratio of the oxygen ion concentrations (see Nernst Voltage).
  • Page 31 XZR200 User’s Manual APPENDIX C Appendix C Quality, Recycling & Warranty Information 97337 Issue 4, July 2018...

  • Page 32: Appendix C Quality, Recycling & Warranty Information

    XZR200 User’s Manual APPENDIX C Appendix C Quality, Recycling & Warranty Information Michell Instruments is dedicated to complying to all relevant legislation and directives. Full information can be found on our website at: www.michell.com/compliance This page contains information on the following directives: •...
  • Page 33 XZR200 User’s Manual APPENDIX D Appendix D Analyzer Return Document & Decontamination Declaration 97337 Issue 4, July 2018...

  • Page 34: Appendix D Analyzer Return Document & Decontamination Declaration

    Has the equipment been cleaned and decontaminated? NOT NECESSARY Michell Instruments will not accept instruments that have been exposed to toxins, radio-activity or bio-hazardous Work will not be carried out on any unit that does not have a completed decontamination declaration.
  • Page 36 http://www.michell.com...

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