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Michell Instruments Easidew User Manual

Dew-point transmitter
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Easidew
Dew-Point Transmitter
User's Manual
97504 Issue 2
May 2018

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Summary of Contents for Michell Instruments Easidew

  • Page 1 Easidew Dew-Point Transmitter User’s Manual 97504 Issue 2 May 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. Transmitter Code Serial Number Invoice Date Location of Instrument Tag No Transmitter 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

    Figure 5 Connector Installation..................5 Figure 6 2-Wire Connection Diagram ................5 Figure 7 Maximum Load of Easidew - Including Cable Resistance ........6 Figure 8 Installation Location ..................7 Figure 9 Transmitter Mounting - Sensor Block ..............8 Figure 10 Material Permeability Comparison ..............

  • Page 5: Safety

    The instrument should be returned to the manufacturer, Michell Instruments Ltd., or one of their accredited service agents for re-calibration. Safety Conformity This product meets the essential protection requirements of the relevant EU and US standards and directives.

  • Page 6: Abbreviations

    Easidew Transmitter User’s Manual Abbreviations The following abbreviations are used in this manual: barg pressure unit (=100 kP or 0.987 atm) gauge ºC degrees Celsius ºF degrees Fahrenheit direct current ft-lbs foot-pound force grams inch(es) μm micrometer m/sec meters per second...

  • Page 7: Introduction

    INTRODUCTION INTRODUCTION The Michell Instruments Easidew is a 4-20mA loop-powered dew-point transmitter, designed to make dew point measurements in a fl owing sample. The Easidew transmitter is available with 3 different process connections: • 5/8" - 18 UNF : Easidew 2-wire, Easidew M12 •...

  • Page 8: Installation

    Easidew Transmitter User’s Manual INSTALLATION INSTALLATION Unpacking the Instrument On delivery, please check that all the following standard components are in the packing tube: • Easidew Transmitter • Certifi cate of Calibration • Connector (for sensor/cable) The Transmitter will also be supplied with a process seal, which will be fi tted to the unit.

  • Page 9: Preparation Of The Sensor Cable

    Michell Instruments representative (see www.michell.com for details). DIN 43650 Version Cable connection to the Easidew transmitter is made via the removable connector. Removing the central screw enables the connector terminal block to be removed from the outer housing by using a small screwdriver to prise it clear.
  • Page 10 (see Figure 3) before the power is applied. Without this connection, the transmitter may be damaged if allowed to operate for prolonged periods. M12 5-Pin Version Cables with moulded M12 connectors are available from Michell Instruments in the following lengths: • 0.8m •...

  • Page 11: Cable Connection

    Easidew Transmitter User’s Manual INSTALLATION this precaution can result in ground loops and equipment malfunction. Cable Connection DIN 43650 Version To ensure the specifi ed ingress protection is achieved, when installing the connector, the securing screw (with the O-ring and washer) must be tightened to a minimum torque of 3.4 Nm (2.5 ft-lbs).

  • Page 12: Electrical Boundaries

    Figure 8 2.4.2 Digital Communication (M12 Version only) Modbus RTU over RS485 communication is available on the Easidew M12, and can be used simultaneously with the 2-wire current output. Section 2.2 describes the electrical connections to the transmitter. The Modbus register map can be found at the end of this manual.
  • Page 13 Easidew Transmitter User’s Manual INSTALLATION Examples of such conditional limitations are: • Excessive fl ow rate • Presence of particulates matter • Presence of entrained liquids • Excessive sample temperature The basic considerations for each measurement type are as follows: In-Situ Dew-Point Sensor Position –...
  • Page 14 fi ltration. Sample Temperature – Although the Easidew can be operated at sample temperatures up to 70°C, it is advisable to keep the sample temperature as close to ambient, and as stable as possible to keep adsorption & desorption characteristics as consistent as possible (see section X.X Sampling Hints for...

  • Page 15: Sampling Hints

    Easidew Transmitter User’s Manual OPERATION Figure 11 Transmitter Mounting - Sensor Block 2.5.2 Sampling Hints Measurement of moisture content is a complex subject, but does not need to be diffi cult. This section aims to explain the common mistakes made in measurement situations, the causes of the problem, and how to avoid them.
  • Page 16 Easidew Transmitter User’s Manual OPERATION porous medium causing water to migrate into the pressurised air line. This effect is called transpiration. Adsorption and Desorption Adsorption is the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to the surface of a material, creating a fi lm. The rate of adsorption is increased at higher pressures and lower temperatures.

  • Page 17: Transmitter Mounting

    Easidew Transmitter User’s Manual OPERATION The membrane filter is a more expensive but highly effective alternative to a coalescing filter. It provides protection from liquid droplets, and can even stop flow to the analyser completely when a large slug of liquid is encountered.

  • Page 18: 5/8" 18 Unf Version

    Easidew Transmitter User’s Manual MAINTENANCE 48mm Transmitter Mounting - Pipe or Duct Figure 14 2.5.3.1 5/8” 18 UNF Version Remove the protective cover and desiccant capsule from the transmitter and retain for future use Prevent any contamination of the sensor before installation by handling the transmitter by the main body only, avoiding contact with the sensor guard.

  • Page 19: 3/4" - 16 Unf Version

    Easidew Transmitter User’s Manual APPENDIX A 2.5.3.2 3/4” - 16 UNF Version Remove the protective cover and desiccant capsule from the transmitter and retain for future use. Prevent any contamination of the sensor before installation by handling the transmitter by the main body only, avoiding contact with the sensor guard.
  • Page 20 The sensor guard should be replaced if the surface shows any damage or signs of discolouration. When replacing a guard, make sure to wear clkean disposable gloves, and handle by the threaded base section only. Replacement HDPE or stainless steel guards can be ordered from your Michell Instruments representative. HANDLE,...

  • Page 21: Maintenance

    Easidew Transmitter User’s Manual MAINTENANCE can be obtained by your Michell Instruments representative. O-ring Seal If the supplied O-ring seal is damaged or lost a pack of 5 replacement bonded seals can be obtained by contacting your Michell Instruments representative. Michell Instruments...

  • Page 22: Appendix A Technical Specifi Cations

    Easidew Transmitter User’s Manual APPENDIX A Appendix A Technical Specifi cations 97504 Issue 2, May 2018...
  • Page 23 316 stainless steel MiniDIN 43650 form C L=132mm x ø45mm (with connector cable) Dimensions Easidew M12: M12 5 pin L = 155mm x ø45mm (with connector cable) Standard: HDPE <10μm Filter (sensor protection) Optional: 316 stainless steel sintered guard <80μm Easidew: 5/8”...
  • Page 24 Easidew Transmitter User’s Manual APPENDIX A Dimensions Product Dimensions Easidew Easidew M12 5/8” Bonded Seal 132mm   (5.19”) 46mm 46.0 1.811 60.3 2.374 12.7 0.500   45mm (1.81”) (1.77”) 27mm M12 5-WAY 10mm ø27mm A CODED (1.06”) (0.39”) (1.06”)

  • Page 25: Appendix B Quality, Recycling & Warranty Information

    Easidew Transmitter User’s Manual APPENDIX B Appendix B Quality, Recycling & Warranty Information Michell Instruments...
  • Page 26 Easidew Transmitter User’s Manual APPENDIX B Appendix B 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 27: Appendix C Return Document & Decontamination Declaration

    Easidew Transmitter User’s Manual APPENDIX C Appendix C Return Document & Decontamination Declaration Michell Instruments...
  • Page 28 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 29 Easidew Transmitter User’s Manual APPENDIX D Appendix D Modbus Register Map Michell Instruments...
  • Page 30 APPENDIX D Appendix D Modbus Register Map All the data values relating to the Easidew are stored in 16-bit wide holding registers. Registers can contain either measured or calculated values (dew-point, temperature, etc.), or confi guration data (output settings). Modbus RTU Implementation...
  • Page 31 Easidew Transmitter User’s Manual APPENDIX D Register Address Access Data Description Comment Type 0000 uint16 Instrument Modbus Address 1-255 0003 special Status/Fault Indication bit0, Sensor short circuit bit1, Sensor open circuit bit2, Thermistor short circuit bit3, Thermistor open circuit bit4, Sensor over range...
  • Page 32 Easidew Transmitter User’s Manual APPENDIX D 004E special Natural Gas Configuration & Natural gas configuration Precision Select bit1, 0=IGT, 1=ISO bit2, lb/MMscf bit3, ppmV NG bit4, mg/m Precision Select bit15, 0=1 Decimal Place, 1=4 Decimal Places Register confi guration in 1 decimal place precision mode...
  • Page 34 Easidew Transmitter User’s Manual NOTES: Michell Instruments...
  • Page 35 Easidew Transmitter User’s Manual Michell Instruments...
  • Page 36 http://www.michell.com...

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