PST MICHELL Instruments Easidew Advanced Online User Manual
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PST MICHELL Instruments Easidew Advanced Online User Manual

Hygrometer
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Easidew
Advanced Online Hygrometer
User Manual
97621 Issue 1
March 2022

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Summary of Contents for PST MICHELL Instruments Easidew Advanced Online

  • Page 1 Easidew Advanced Online Hygrometer User Manual 97621 Issue 1 March 2022...
  • Page 2 Please fill out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Product Name Order Code Serial Number Invoice Date Installation Location Tag Number Product Name Order Code Serial Number Invoice Date Installation Location Tag Number...
  • Page 3 Easidew Advanced Online Hygrometer For Michell Instruments' contact information please go to www.michell.com © 2022 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

    Easidew Advanced Online Hygrometer Manual Contents Safety ..........................vi Electrical Safety ......................vii Pressure Safety ......................vii Hazardous Materials (WEEE, RoHS3 & REACH) ..............vii Repair and Maintenance ....................vii Calibration ........................vii Safety Conformity .......................vii Abbreviations ........................viii INTRODUCTION ....................1 Features ......................1 INSTALLATION ....................2 Unpacking the Instrument ...................
  • Page 5 Easidew Advanced Online Hygrometer Manual 3.4.5 Pressure Configuration ................31 3.4.6 About Menu ....................32 MAINTENANCE ....................33 Maintenance and Calibration ................33 Fault Conditions ....................33 MEASUREMENT GUIDE ..................34 Sampling Considerations ................... 34 Sampling Hints ....................37 Figures Figure 1 Unpacking Method ..................2 Figure 2 Transmitter Unpacking Method ..............3...

  • Page 6: Safety

    Easidew Advanced Online Hygrometer Manual Safety The instrument is designed to be completely safe when installed and operated correctly in accordance with the information provided in this manual. This manual contains all the required information to install, operate and maintain this product. Prior to installation and use of this product, this entire manual should be read and understood.

  • Page 7: Electrical Safety

    Easidew Advanced Online Hygrometer Manual Electrical Safety Ensure electrical safety is complied with by following the directions provided here and observing all local operation & installation requirements at the intended location of use. This product is completely safe when using any options and accessories supplied by the manufacturer of this product for use with it.

  • Page 8: Abbreviations

    Easidew Advanced Online Hygrometer Manual Abbreviations The following abbreviations are used in this manual: alternating current pressure unit (atmosphere) barg pressure unit (=100 kP or 0.987 atm) ºC degrees Celsius ºF degrees Fahrenheit direct current dew point foot (feet) gram(s) Hertz “...

  • Page 9: Introduction

    Easidew Advanced Online Hygrometer Manual INTRODUCTION INTRODUCTION The Easidew Advanced Online Hygrometer is easy to install and configure; this versatile touch screen hygrometer can measure and display dew point and moisture content and indicate pressure. This display provides analog, digital and 4 programmable relay alarm outputs with front screen or software app display configuration.

  • Page 10: Installation

    Easidew Advanced Online Hygrometer Manual INSTALLATION INSTALLATION It is essential that the connection of electrical and gas supplies to this instrument be undertaken by competent personnel. Unpacking the Instrument The Easidew instruments and accessories are packed into a box and the method of unpacking is shown as follows: Figure 1 Unpacking Method...

  • Page 11: Unpacking The Easidew Advanced Online Sensor

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.1.1 Unpacking the Easidew Advanced Online Sensor NOTE: For environmental and operating conditions refer to Appendix A. Unpack the dew-point transmitter box as follows : Figure 2 Transmitter Unpacking Method Unscrew the cap (1) from the packing tube (6). Remove the foam block (2). Remove the transmitter from the tube, complete with the body cover (4) and tip cover (5).

  • Page 12: Easidew Advanced Online Components

    Easidew Advanced Online Hygrometer Manual INSTALLATION Easidew Advanced Online Components On delivery please check that all the following standard components are present in the packing box. Report any shortages to Michell Instruments, immediately. Figure 3 Easidew Advanced Online Components Monitor clamps (2 off) Easidew Advanced Online Hygrometer Transmitter cable assembly Screwdriver...

  • Page 13: Process Monitor Display

    Easidew Advanced Online Hygrometer Manual INSTALLATION Process Monitor Display The display within the Process Monitor is an LCD 320 x 240 pixel software driven, touch screen color display. 2.3.1 Process Monitor Display Layout In normal operation, the display screen will appear as below. The display shows a moisture and pressure value, the status of four alarms and a display locked/unlocked symbol, which is all explained in detail in Figure 4 below.

  • Page 14: Electrical Connections

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.3.2 Electrical Connections Electrical connections to the Easidew Online system are as follows: • AC power supply input, 85...265V AC (7.5 VA) • Alternative low-voltage DC input is also available: 18...30V DC (170 mA @24V DC) •...

  • Page 15: Low-Voltage Power Supply Input (Alternative)

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.3.2.2 Low-Voltage Power Supply Input (Alternative) For low-voltage DC powered display • 18...30V DC Connect the power supply to the DC version Process Monitor as shown in Figure 5 . PIN 15 – 0V DC PIN 16 –...

  • Page 16: Pressure Sensor Input (Optional)

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.3.2.4 Pressure Sensor Input (Optional) For AC or DC voltage powered display version Connect the Pressure Sensor to the monitor as shown in Figure 7 . PIN 4 – +24 V DC Power PIN 5 – 4...20 mA signal return PIN 6 –...

  • Page 17: 2.3.2.7 Relay Outputs

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.3.2.7 Relay Outputs For AC or DC voltage powered display versions, the relay outputs are shown below in Figure 10 . Figure 10 Relay Output Connections 2.3.2.8 Transmitter Connections Connect the Easidew M12 dew-point sensor as shown in the table in Figure 12 . Michell Instruments...

  • Page 18: Mounting The Process Monitor

    Easidew Advanced Online Hygrometer Manual INSTALLATION Mounting the Process Monitor The Process Monitor is designed for panel mounting and requires a panel cut-out of 44 x 92 mm (1.73 x 3.62”). The recommended panel thickness is 2...5 mm (0.08...0.2”). To mount the unit, proceed as follows: Pass the Process Monitor through the front of the panel.

  • Page 19: Easidew Transmitter

    Easidew Advanced Online Hygrometer Manual INSTALLATION Easidew Transmitter NOTE: The transmitter’s sensing element is shown for illustration purposes only. Please keep the guard fitted at all times, if possible. Easidew Transmitter Figure 11 2.5.1 Easidew M12 Connector Version The following sections apply to the M12 connector version of the transmitter shown below.

  • Page 20: 2.5.1.1 Electrical Connections

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.5.1.1 Electrical Connections Sensor Michell Function Process Connector Standard Monitor Conductor Connection Color Pin No. Brown Modbus A White Modbus B Blue 4...20 mA Signal Return (Power Supply -ve) (not used – see note) Black Power Supply +ve Grey...

  • Page 21: 2.5.1.2 Easidew M12 Cables

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.5.1.2 Easidew M12 Cables The cable connector should be installed by aligning the locating pin on the transmitter with the slot on the cable. The connector can then be pushed into place and rotated until finger tight.

  • Page 22: Transmitter Mounting

    Easidew Advanced Online Hygrometer Manual INSTALLATION Transmitter Mounting 2.6.1 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. Pass the bonded seal over the 5/8”- 18 UNF mounting thread.

  • Page 23: Transmitter Mounting - Sample Block

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.6.4 Transmitter Mounting – Sample Block The following procedure must be carried out by a qualified installation engineer. To mount the transmitter into the sensor block (preferred method), proceed as follows, referring to Figure 13. Ensure that the protective cover (2), and its desiccant capsule (2a), have been removed from the tip of the transmitter.

  • Page 24: Transmitter Mounting - Direct Pipeline Connection

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.6.5 Transmitter Mounting – Direct Pipeline Connection The transmitter may be directly mounted into a pipe or duct, as shown in Figure 14. CAUTION: Do not mount the transmitter too close to the bottom of a bend where any condensate in the pipeline might collect and saturate the probe.

  • Page 25: Transmitter Mounting - With Additional Process Connection Adapter

    Easidew Advanced Online Hygrometer Manual INSTALLATION 2.6.6 Transmitter Mounting – With Additional Process Connection Adapter The following procedure must be carried out by a qualified installation engineer. To mount the adapter into the transmitter, proceed as follows (see Figure 15 ) : 1.

  • Page 26: Mounting The Sample Block And Transmitter

    Easidew Advanced Online Hygrometer Manual INSTALLATION Mounting the Sample Block and Transmitter 2.7.1 Sample Block Gas Connections Sample gas connections are made to the Gas In and Gas Out ports on the sample block (see Figure 16 ) . Either port on the sample block may be used as the Gas Input port (i.e. for connection purposes the ports are interchangeable).
  • Page 27 Easidew Advanced Online Hygrometer Manual INSTALLATION Fit the back ferrule (3) over the stainless steel tubing (1) with the bevelled end facing the back of the front ferrule (4). Place the front ferrule (4) over the stainless steel tubing (1), bevelled end towards the adaptor (5).

  • Page 28: Operation

    Easidew Advanced Online Hygrometer Manual OPERATION OPERATION Process Monitor Configuration When you receive your Easidew Advanced Online Hygrometer system it will be configured to match your ordered dew-point range, with all other settings at a factory default. You will then need to configure the Process Monitor to meet your own requirements. Set-up can easily be undertaken in less than 10 minutes, using either of the following two methods: •...
  • Page 29 Easidew Advanced Online Hygrometer Manual OPERATION Enter the fixed security code 5618 to access the configuration menu. Menu Click on the icon on the top left-hand side of the display. Michell Instruments...

  • Page 30: Configuration Menu Explained

    Easidew Advanced Online Hygrometer Manual OPERATION Configuration Menu Explained Clicking on the Menu icon will give you access to the Process Monitor configuration menu. For most customers, you will only have to set this up once and your configuration will be saved and will not then need to be reconfigured. WARNING: If the output signals from the Process Monitor are used within your own control system, you need to ensure good instrumentation practice is followed and no unauthorized reconfiguration is undertaken which could...

  • Page 31: Setting Up The Process Monitor Configuration

    Easidew Advanced Online Hygrometer Manual OPERATION Setting Up the Process Monitor Configuration This section looks at each menu configuration and explains, simply, how to set them up. Please note, if there are multiple identical set-ups within one menu (e.g. 4 programmable relay outputs), these are explained using one example.
  • Page 32 Easidew Advanced Online Hygrometer Manual OPERATION Each set point (e.g. Hi S/P Lo S/P ) has a built-in fixed % hysteresis value to create a small dead band below the set-point value, to ensure the relay does not constantly energize and de-energize when the measured or calculated value oscillates around the set-point value.
  • Page 33 Easidew Advanced Online Hygrometer Manual OPERATION Click on Lo S/P , then enter your required relay switch set point and press Click on the Save icon and the programmed value will be stored. You are now back on the Alarm 1 screen, which confirms your entered configuration.

  • Page 34: Analog Outputs Configuration

    Easidew Advanced Online Hygrometer Manual OPERATION 3.4.2 Analog Outputs Configuration There are three analog 4...20 mA outputs that can be configured to any measured or calculated parameter within the Process Monitor. Outputs button will take you to the screen shown below in Figure 19 . Selecting the The following explains how to set up Analog Output Channel 1.
  • Page 35 Easidew Advanced Online Hygrometer Manual OPERATION Click on the Save icon and the programmed value will be stored. Click on the 4 mA box and the Enter box will appear. Enter your required zero value, then press Click on the Save icon and the programmed value will be stored.

  • Page 36: Display Configuration

    Easidew Advanced Online Hygrometer Manual OPERATION 3.4.3 Display Configuration This is a simple menu screen that allows you to configure basic monitor settings and scalings as shown in Figure 20 below. Selects the required temperature scale for the dew-point parameter Sets the Modbus address for the Process Monitor RS485 digital communications Selects the required pressure scale for the indicated pressure parameter...

  • Page 37: Input Configuration

    Easidew Advanced Online Hygrometer Manual OPERATION 3.4.4 Input Configuration This is a simple menu screen displaying the measured or fixed inputs to the Process Monitor, as shown below in Figure 21 . Displays the highest measurement value of the dew-point sensor input Displays the lowest measurement range of the dew-point sensor input Displays the highest indicated or fixed input of pressure Displays the lowest indicated or fixed input of pressure...
  • Page 38 Easidew Advanced Online Hygrometer Manual OPERATION If you go back to the Input Configuration screen you will see the Hi S/P Lo S/P display below, with the Pressure boxes greyed out, confirming that no live pressure signal is being inputted to the Process Monitor.

  • Page 39: Pressure Configuration

    Easidew Advanced Online Hygrometer Manual OPERATION 3.4.5 Pressure Configuration Pressure indication can be inputted into the Process Monitor either with a live pressure signal from an external 4...20 mA pressure sensor or through a fixed pressure value entry on the Process Monitor. To calculate moisture content from dew point, it is necessary to know the system pressure and this pressure indication input is then used for that purpose.

  • Page 40: About Menu

    Easidew Advanced Online Hygrometer Manual OPERATION Go back to the Input Configuration screen, then enter the Hi S/P Lo S/P value equating to 20 mA and the value equating to 4 mA value of the external pressure sensor. Save this input. In the example below, a 0...10 bar (4...20 mA) pressure sensor is being used to input a live pressure signal into the Process Monitor.

  • Page 41: Maintenance

    Easidew Advanced Online Hygrometer Manual MAINTENANCE MAINTENANCE Maintenance and Calibration Routine maintenance of the Easidew M12 Transmitter is confined to regular re-calibration. For most applications, annual re-calibration ensures that the stated accuracy of the Easidew M12 Transmitter is maintained. Specialist calibration instrumentation is required to calibrate the transmitter and a true calibration can only be performed by exposure of the dew-point sensor to a reference gas of known dew point.

  • Page 42: Measurement Guide

    Easidew Advanced Online Hygrometer Manual MEASUREMENT GUIDE MEASUREMENT GUIDE Sampling Considerations There are two basic methods of measuring a sample with the Easidew M12 Transmitter: • In-situ measurements are made by placing the transmitter inside the environment to be measured. •...

  • Page 43: Figure 22 Installation Location

    Easidew Advanced Online Hygrometer Manual MEASUREMENT GUIDE In-Situ Dew-Point Sensor Position – will the sensor see an area of the environment that is representative of what you want to measure? For example, if the sensor is to be mounted into a glove box, there are three different positions in which it could be installed –...
  • Page 44 Easidew Advanced Online Hygrometer Manual MEASUREMENT GUIDE Gas speed – if you are planning on installing the sensor in a duct, consider how fast the sample gas is moving through it. If the gas speed is very low, or occasionally static, then the moisture content through the length (and width, if it is more than a few cm across) of the duct is unlikely to be uniform.

  • Page 45: Sampling Hints

    Easidew Advanced Online Hygrometer Manual MEASUREMENT GUIDE Sampling Hints Measurement of moisture content is a complex subject, but does not need to be difficult. This section aims to explain the common mistakes made in measurement situations, the causes of the problem, and how to avoid them. Mistakes and bad practices can cause the measurement to vary from the expectation;...

  • Page 46: Figure 25 Dead Volume

    Easidew Advanced Online Hygrometer Manual MEASUREMENT GUIDE In practical terms, as the temperature of the environment fluctuates, water molecules are adsorbed and desorbed from the internal surfaces of the sample tubing, causing small fluctuations in the measured dew point. Sample Tubing Length The sample point should always be as close to the critical measurement point as possible, in order to obtain a truly representative measurement.
  • Page 47 Easidew Advanced Online Hygrometer Manual MEASUREMENT GUIDE The integrity of all connections is also an important consideration, especially when sampling low dew points at an elevated pressure. If a small leak occurs in a high pressure line, gas will leak out but vortices at the leak point and a negative vapor pressure differential will also allow water vapor to contaminate the flow.

  • Page 48: Appendix A Technical Specifications

    Easidew Advanced Online Hygrometer Manual APPENDIX A Appendix A Technical Specifications 97621 Issue 1, March 2022...
  • Page 49 Easidew Advanced Online Hygrometer Manual APPENDIX A Appendix A Technical Specifications Performance Specifications -110...+20 °C dew point (-166...+68 °F); -100...+20 °C Measurement Range (-148...+68 °F) dew point ±1 °C from -60 to +20 °C dew point (±1.8 °F, -76...+68 °F dp) Accuracy * ±2 °C from -100 to -60 °C dew point (±3.6 °F, -148...-76 °F dp) Response Time...
  • Page 50 Easidew Advanced Online Hygrometer Manual APPENDIX A Standard: HDPE <10μm Filter (Sensor Protection) Optional: 316 stainless steel sintered guard <80μm Sensor/Sample Block Process G1/2” BSP, 3/4” 16 UNF, 5/8” 18 UNF Connections Sample Block Inlet/Outlet 1/8” NPT Connections Sensor 150 g (5.29 oz); Sample Block 250 g (8.82 oz); System Weights Process Monitor 280 g (9.88 oz) Sensor Electrical Connections Easidew M12: M12 5 pin (A Coded)
  • Page 51 Easidew Advanced Online Hygrometer Manual APPENDIX A 46.0 1.811 60.3 2.374 12.7 0.500 M12 5-WAY A CODED 5/8" UNF THREAD 27.0 1.063 8.0 0.315 BONDED SEAL DIMENSIONS IN mm [INCHES] 46.0 1.811 60.3 2.374 12.7 0.500 PROJECT: MATERIAL: FINISH: XXXXXXXXX M12 5-WAY THIS DOCUMENT IS THE PROPERTY OF MICHELL DRAWING TITLE:...

  • Page 52: Appendix B Process Monitor Register Map

    Easidew Advanced Online Hygrometer Manual APPENDIX B Appendix B Process Monitor Register Map 97621 Issue 1, March 2022...
  • Page 53 Easidew Advanced Online Hygrometer Manual APPENDIX B Appendix B Process Monitor Register Map This is a register map for all firmware versions of the Process Monitor. Some registers are not applicable to the Easidew Advanced Online Hygrometer. Read/ Default Register Address Function Description Notes...
  • Page 54 Easidew Advanced Online Hygrometer Manual APPENDIX B Read/ Default Register Address Function Description Notes Write Value Configuration Fixed pressure input value lo word FLOAT (n/a for O only) Liquid Selection Liquid Mix Ratio (% of Mixed Liquid 1) User Cs Table 1, Cs Value at -20 °C User Cs Table 1, Cs Value at -10 °C User Cs Table 1, Cs Value at 0 °C User Cs Table 1, Cs Value at 10 °C...
  • Page 55 Easidew Advanced Online Hygrometer Manual Read/ Default Register Address Function Description Notes Write Value Configuration Analog Output 1 – DAC 4 mA Value 0...65535 Analog Output 1 – DAC 20 mA 0...65535 Value Analog Output 2 – DAC 4 mA Value 0...65535 Analog Output 2 –...
  • Page 56 Easidew Advanced Online Hygrometer Manual Read/ Default Register Address Function Description Notes Write Value Configuration Moisture – ppm – Hi Word IEEE754 Moisture – ppm – Lo Word IEEE754 Moisture – ppm (Ideal) – Hi Word IEEE754 Moisture – ppm (Ideal) –...
  • Page 57 Easidew Advanced Online Hygrometer Manual APPENDIX B Register Configuration A A1: Unsigned Short. Range = 0...65535 A2: Unsigned Short /10. Range = 0...6553.5 A3: Unsigned Short /100. Range = 0...655.35 Conversion: float*x = unsigned integer Unsigned integer/x = float Or cast: float value to read= ((float) (value))/x;...
  • Page 58 Easidew Advanced Online Hygrometer Manual APPENDIX B Register Configuration C – System Configuration Pressure Units (PU) Temperature Unit (TU) 00 = Bar.G (def) 0 = C (def) 01 = Psi.G 1 = F 10 = Mpag 11 = Spare Main Unit Instrument Type (IT) –...
  • Page 59 Easidew Advanced Online Hygrometer Manual APPENDIX B Register Configuration E – mA Output Config Ouput1 Parameter (O1) Output2 Parameter (O2) 0000 = Dewpoint (O2) 0000 = Dewpoint (O2) 0001 = Pressure/Temperature 0001 = Pressure/Temperature 0010 = ppm 0010 = ppm 0011 = ppm (Ideal) 0011 = ppm...
  • Page 60 Easidew Advanced Online Hygrometer Manual APPENDIX B Register Configuration G – Liquid Selection Liquid Selection (LQ) Mixed Liquid 1 (M1) 0 = n-Butane 0 = n-Butane 1 = n-Propane 1 = n-Propane 2 = n-Hexane 2 = n-Hexane 3 = Cumene 3 = Cumene 4 = Benzene 4 = Benzene...
  • Page 61 Easidew Advanced Online Hygrometer Manual APPENDIX B Register Configuration H – Instrument Setup and Command Register (Reg 30) 2 = Set Dewpoint Channel 4 mA ADC Value 3 = Set Dewpoint Channel 20 mA ADC Value 4 = Set Pressure/Temperature Channel 4 mA ADC Value 5 = Set Pressure/Temperature Channel 20 mA ADC Value 10 = Force Analog Output 1...4 mA 11 = Force Analog Output 1...20 mA...

  • Page 62: Appendix C Quality, Recycling & Warranty Information

    Easidew Advanced Online Hygrometer Manual APPENDIX C Appendix C Quality, Recycling & Warranty Information 97621 Issue 1, March 2022...
  • Page 63 Easidew Advanced Online Hygrometer 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 64: Appendix D Return Document & Decontamination Declaration

    Easidew Advanced Online Hygrometer Manual APPENDIX D Appendix D Return Document & Decontamination Declaration 97621 Issue 1, March 2022...
  • Page 65 Easidew Advanced Online Hygrometer Manual APPENDIX D Appendix D Return Document & Decontamination Declaration Decontamination Certificate IMPORTANT NOTE: Please complete this form prior to this instrument, or any components, leaving your site and being returned to us, or, where applicable, prior to any work being carried out by a Michell engineer at your site.
  • Page 66 www.ProcessSensing.com http://www.michell.com...

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