Michell Instruments Liquidew EExd User Manual
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Michell Instruments Liquidew EExd User Manual

Process moisture analyzer
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Liquidew EExd
Process Moisture Analyzer
User's Manual
97097 Issue 14.1
November 2019

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Summary of Contents for Michell Instruments Liquidew EExd

  • Page 1 Liquidew EExd Process Moisture Analyzer User’s Manual 97097 Issue 14.1 November 2019...
  • 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. Analyzer Code Serial Number Invoice Date Location of Instrument Tag Number Analyzer Code Serial Number Invoice Date...
  • Page 3 © 2019 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

    Power Connections ..................12 2.5.3 Analog and Digital Communications ............. 13 2.5.4 Process Alarms and Analyzer Status Alarms ..........13 Liquidew EExd Start-up Purge Procedure ............14 Sample Flows ....................15 OPERATION ....................16 System Operation ..................... 16 User Interface ....................16 3.2.1...
  • Page 5 4.4.3 Logged Error Codes ..................32 4.4.4 Analyzer Fault Alarm Relay ................33 Figures Figure 1 Liquidew EExd Sampling System ..............4 Figure 2 Power Connection Connector ...............5 Figure 3 Earthing Stud And Nut Washer Assembly .............6 Figure 4 Liquidew EExd Dimensions ................10 Figure 5 Pipework Connections ................11...
  • Page 6 Liquidew EExd User’s Manual Appendices Appendix A Technical Specification ................35 Mounting Drawing ............... 37 Pipework Connections ..............38 System Wiring Diagram ..............39 Appendix B Variable Definitions ..................41 Appendix C Software ....................46 System Requirements ..............46 Appendix D Calibration Correction ................

  • Page 7: Safety

    Liquidew EExd User’s Manual Safety This manual contains all the required information to install, operate and maintain the Liquidew EExd. Prior to installation and use of this instrument, this entire manual should be read and understood. Installation and operation of this product should be carried out by suitably competent personnel only. The operation of this product must be in accordance with the terms of this manual and associated safety certificates.

  • Page 8: Abbreviations

    Liquidew EExd User’s Manual Abbreviations The following abbreviations are used in this manual: alternating current pressure unit (atmosphere) barg pressure unit (=100 kP or 0.987 atm) gauge °C degrees Celsius °F degrees Fahrenheit dew point European Union gallons per minute...

  • Page 9: Introduction

    (7.2 psig)) between the process sample source and return points. This should enable a flow between 0.1 and 0.3 l/min (0.03 and 0.08 GPM) through the Liquidew EExd and its associated sampling system. Sample entry and exit ports direct the liquid through flame arrestors which, along with the Exd enclosure, provide the explosion proof protection.

  • Page 10: Operating Overview

    User Display and Interface The Liquidew EExd User Display and Interface Unit is presented via the circular window of the enclosure. Operation is achieved by a unique system, which allows full control through the glass of the enclosure cover. The cover is fully detachable for greater access into the enclosure during the installation and initial set-up of the instrument.

  • Page 11: Elimination Of Temperature Effects

    Liquidew EExd User’s Manual INTRODUCTION Four user-programmable tables enable the Liquidew EExd to be applied to virtually any immiscible solute. For simple mixtures of hydrocarbons, a proportional combination of the Cs values for two or three individual substances can be applied, although with increased measurement uncertainty.

  • Page 12: Liquidew Eexd Sampling System

    Michell's 30 years of expertise in on-line process moisture analyzers are used to optimize the design of the Liquidew EExd Sampling Systems. Contact Michell Instruments for further details: www.michell.com. 97097 Issue 14.1, November 2019...

  • Page 13: Installation

    2.1.1 Equipment Ratings and Installation Details The mandatory statements contained within refer to the Ex certified Liquidew EExd Analyzer only (not including the sampling system). This equipment must be supplied with a voltage between the range of 90 to 260 V AC, 47/63 Hz.

  • Page 14: Figure 3 Earthing Stud And Nut Washer Assembly

    Figure 3 Earthing Stud And Nut Washer Assembly Fuse: A replacement fuse can be obtained by contacting Michell Instruments' technical support. Fuse rating = 5 x 20mm 2.5 A anti-surge to IEC 60127-2. This product is designed to be safe at least under the following conditions: between a temperature range of -40 to +60°C (-40 to +148°F), in maximum 80% relative humidity...
  • Page 15 Liquidew EExd User’s Manual INSTALLATION Location and mounting arrangements - refer to the relevant sections of this manual for the location and mounting details. Installation of this equipment must include the provision of a suitable and locally positioned power isolation switch or circuit breaker. Indication of the purpose of the switch or circuit breaker is strongly recommended.

  • Page 16: Hazardous Area Safety

    Liquidew EExd User’s Manual INSTALLATION Hazardous Area Safety Refer to Appendix H for the Hazardous Area Certification of this product. This product is fitted with a marking label that contains Hazardous Area information pertinent to the suitable location and installation.

  • Page 17: Pressure Safety

    Liquidew EExd User’s Manual INSTALLATION Pressure Safety WARNING: This product is used in conjunction with pressurized gases. Observe pressurized gas handling precautions. WARNING: Pressurized gas is dangerous. Pressurized gas should only handled by suitably trained personnel. This product requires pressurized gas to be connected to it. Observe pressurized gas handling regulations.

  • Page 18: Analyzer System

    Liquidew EExd User’s Manual INSTALLATION Analyzer System Refer to the Installation & Maintenance Information sheet (supplied separately) and the System Drawings in Appendix A. The instrument is housed in an aluminum EExd enclosure suitable for wall or panel mounting. Four mounting points are available with M12 clearance holes on fixing centres of X = 270mm x Y = 318mm.

  • Page 19: Pipework

    (if greater than +40°C (+104°F) before entering into the measurement system. In accordance with the Certification requirements, the Liquidew EExd must have, as a minimum, those components described in the Sample System Flow Diagram shown in Figure 6.

  • Page 20: Power Connections

    Liquidew EExd User’s Manual INSTALLATION The following points should be considered when installing the sample liquid supply line: PTFE tape is recommended for pipe connections. Solvent based pipe thread sealant should not be used, as condensable components or contaminates can be leached during the curing period.

  • Page 21: Analog And Digital Communications

    Two active 4-20 mA outputs and a Modbus RS485 digital interface (see Appendix F for details) are provided with the Liquidew EExd. mA1 and mA3 output the moisture or dew-point values. mA2 and mA4 output the sample temperature values of Channels 1 &...

  • Page 22: Liquidew Eexd Start-Up Purge Procedure

    Before start-up ensure that all power and signal connections to the Liquidew EExd are fully isolated. Ensure that all Inlet & Outlet liquid connections to the Liquidew EExd are made correctly and are leak tight checked. Fully open the sample Inlet & Outlet isolation valves.

  • Page 23: Sample Flows

    Liquidew EExd User’s Manual INSTALLATION MINIMUM REQUIREMENTS FOR START UP PURGING   FLOW CONTROL NON-RETURN INLET CHANNEL 1 NEEDLE VALVE VALVE NEEDLE VALVE SAMPLE SAMPLE   OUTLET INLET SAMPLE IN SAMPLE OUT LIQUIDEW EExd FLOW CONTROL INLET NEEDLE VALVE...

  • Page 24: Operation

    Liquidew EExd User’s Manual OPERATION OPERATION System Operation At switch-on, the instrument will display the MAIN Page. It will synchronise itself to the on-board real time clock, in order to begin logging data at the next minute that is a multiple of 5, i.e.

  • Page 25: Up/Down Arrow Buttons

    Liquidew EExd User’s Manual OPERATION 3.2.2 ‘Up/Down Arrow’ Buttons Figure 10 Up/Down Arrow Buttons Down ( () and ) buttons are used to change pages, scroll through lists and adjust values. 3.2.3 ‘SELECT’ Button SELECT Figure 11 ‘SELECT’ Button SELECT button is used to select or de-select a highlighted item in a menu list.

  • Page 26: Menu Structure

    Liquidew EExd User’s Manual OPERATION Menu Structure Figure 14 below shows a map of the menu structure. MENU MAIN Press MENU/MAIN button to get back to Main Page from any location Choices Start-Up Banner Menu Pages MENU MAIN  Other Pages...

  • Page 27: Main Menu Page

    Liquidew EExd User’s Manual OPERATION MAIN MENU Page This page is accessed by pressing the MAIN/MENU button from the MAIN Page. The instrument’s status, variables, logged data and system information are available through Down ( this page. Use the () and ) buttons to highlight the page of interest and...

  • Page 28: Logging Menu Page

    Liquidew EExd User’s Manual OPERATION LOGGING MENU Page This page allows the viewing of data or statistical information on the logged data. Press SELECT button to see the following options: View Logged Data View Statistics View System Faults Down (...

  • Page 29: View Statistics

    Liquidew EExd User’s Manual OPERATION 3.6.2 VIEW STATISTICS These pages display the maximum, minimum and average values for each measured RESET LOG parameter for up to 150 previous measurement samples. on the MAIN MENU Page re-sets the logging statistics. STATISTICS PAGE 1/2 MOIST MAX -3.6...

  • Page 30: View/Adj Variables Page

    Liquidew EExd User’s Manual OPERATION VIEW/ADJ VARIABLES Page For more information on each variable refer to Appendix B. 3.7.1 Password To safeguard against unauthorized adjustment of set-up parameters and variables, an entry lock is provided. The user must first input the access code to enter the VIEW/ADJUST VARIABLES Pages.

  • Page 31: Single Channel Configuration Variables Pages

    Liquidew EExd User’s Manual OPERATION VARIABLES PAGE 1/3 Moisture UNITS cumeme apply PPM(W) alarm -100 PPM(W) OP1 MIN OP1 MAX PPM(W) OP2 MIN Variables Page in single channel configuration with Moisture & Solute Cumene selected Figure 20 VARIABLES Pages (Examples) 3.7.3...

  • Page 32: Dual Channel Configuration Variables Pages

    Liquidew EExd User’s Manual OPERATION 3.7.4 Dual Channel Configuration Variables Pages For more information on each variable see Appendix B. Variables Page 1 Variable Brief Description CHN1 Moisture content or dew-point value for Channel 1 When calculating moisture content, this variable is used to select the...

  • Page 33: User-Defined Solutes

    Liquidew EExd User’s Manual OPERATION 3.7.5 User-Defined Solutes When selecting the sample solute type it is also possible to select up to four different user-defined solutes, labelled by default as U1, U2, U3 and U4. These are available by scrolling through to the end of the list of sample solute types. The table of saturation constants (or Cs values) of each user-defined solute can be edited by the user.

  • Page 34: Sensor Info Page

    Duration that the sensor has been in active use Next Cal Next recommended calibration date of sensor Sensor S/N Serial number of sensor CONTACT INFO Page This page contains contact information for Michell Instruments. CONTACT INFO MICHELL INSTRUMENTS WEB: WWW.MICHELL-INSTRUMENTS.COM E-MAIL: INFO@MICHELL-INSTRUMENTS.COM...

  • Page 35: Maintenance

    1.5x the max operating pressure before the full product is re-energized. The design of the Liquidew EExd sensor cell and measurement system is such that no specific routine maintenance is required. If, however, a fault does occur with your system that is not covered within this manual, please contact Michell Instruments (www.

  • Page 36: Replacement Of The Sensor Assembly

    Liquidew EExd User’s Manual MAINTENANCE Figure 23 Ribbon Cable Connection Always keep the bayonet fittings lightly lubricated. If required, the user interface can be fully disconnected from the instrument by disconnecting the ribbon cable connection to the main processor PCB.

  • Page 37: Figure 24 Moisture Sensor Assembly Replacement

    Liquidew EExd User’s Manual MAINTENANCE Figure 24 Moisture Sensor Assembly Replacement Carefully pull the sensor block assembly out of the enclosure. This will allow access to the two sensor connections. Disconnect the ribbon cable connectors from the sensor pcb. Fully remove the sensor assembly from the enclosure.

  • Page 38: Replacement Of The Flow Meter

    Liquidew EExd User’s Manual MAINTENANCE Replacement of the Flow Meter The power to the enclosure must be turned off before any work is carried out in the measurement system enclosure. DANGER Observe de-energize durations Electric Shock Risk Figure 25 Flow Meter Replacement Isolate the incoming sample line by CLOSING the sample inlet isolation valve and allow the system to depressurize.

  • Page 39: Troubleshooting

    Liquidew EExd User’s Manual MAINTENANCE Troubleshooting 4.4.1 Error Messages If a system errors occur, an error message will appear at the bottom line of the MAIN Page describing the problem. If more than one system error has occurred, the error messages associated with those faults will continually scroll in turn.

  • Page 40: Logged Error Codes

    Liquidew EExd User’s Manual MAINTENANCE 4.4.3 Logged Error Codes This page displays a record of the last six system error codes that have occurred in order to assist in the diagnosis of any past anomalies. Error codes are only logged at the end of every measurement cycle and indicate a change in status of single or multiple errors.

  • Page 41: Analyzer Fault Alarm Relay

    Liquidew EExd User’s Manual MAINTENANCE If more than one error has occurred, then the error codes will be added together: 0104 Error Code 0100 Error Code (Channel 2 dew-point sensor over range) plus 0004 0100 0004 0104 Error Code (Channel 1 temperature out of range) (...
  • Page 42 Liquidew EExd User’s Manual APPENDIX A Appendix A Technical Specifications 97097 Issue 14.1, November 2019...

  • Page 43: Appendix A Technical Specification

    Liquidew EExd User’s Manual APPENDIX A Appendix A Technical Specification Main Unit – Measurement Parameters Channel Configuration Single and dual channel Moisture Content Temperature °C and °F Water Dew Point °C and °F Status indication: LOW/OK/HIGH Sample Flow Rate <0.1 to >0.3 l/min (<0.03 to >0.08 GPM)
  • Page 44 Liquidew EExd User’s Manual APPENDIX A General Sample Connections 1/8" NPT(F) Weight 21kg (46lbs) Operating Supply Voltage 90 to 260 V AC, 47/63 Hz, 180 W - Main Unit Indoor/Outdoor -20 to +60°C (-4 to +140°F) Operating Environment Max 95%RH...

  • Page 45: Figure 28 Mounting Drawing

    Liquidew EExd User’s Manual APPENDIX A Mounting Drawing 245mm 9.65" 270mm 10.63" 4 o M12 (1/2") Clearance Sample in - Channel 1 Flame Arrestor Enclosure Breather 1/8" NPT Female (ATEX/IECEx/CSA) Flame Arrestor Do NOT obscure Sample out - Channel 1...

  • Page 46: Figure 29 Pipework Connections

    Liquidew EExd User’s Manual APPENDIX A Pipework Connections Figure 29 Pipework Connections 97097 Issue 14.1, November 2019...

  • Page 47: Figure 30 System Wiring Diagram

    Liquidew EExd User’s Manual APPENDIX A System Wiring Diagram Optional COMMS Channel 1 Channel 2 NC C NO NC C NC C NO NC C 7 8 9 10 11 12 16 17 18 19 20 21 22 23 1 2 3 4 5 6...
  • Page 48 Liquidew EExd User’s Manual APPENDIX B Appendix B Variable Definitions 97097 Issue 14.1, November 2019...

  • Page 49: Appendix B Variable Definitions

    Liquidew EExd User’s Manual APPENDIX B Appendix B Variable Definitions From the Variables Page, press the () or Down ( ) buttons to highlight the variable required. Press the SELECT button to enter the range/options area. Change the variable using the () or...
  • Page 50 Liquidew EExd User’s Manual APPENDIX B Variable: alarm Adjustable Range/Options: -100 to +20°C for Dew point, 0 to 5000 PPM(W) for Moisture Description: The set-point for the process alarm that activates the channel alarm relay when the moisture value exceeds it.
  • Page 51 INST ADDR Variable: 01 to 31 Adjustable Range/Options: Description: Unique instrument address for networking. This address is used by the Modbus protocol to specify the location of the Liquidew EExd instrument in the network. SET DEFAULT Variable: NONE Adjustable Range/Options: Description: Sets instrument to default configuration.
  • Page 52 Liquidew EExd User’s Manual APPENDIX B CS VALUES Variable: 0 to 5000 PPM(W) Adjustable Range/Options: Description: The Cs Values available to adjust or view in the user-defined Cs table pages. User-defined Solute CUSTOM LABEL CHAR Variable: A to Z, hyphen, space, 0 to 9 Adjustable Range/Options: Description: Characters that make up the user-defined solute custom label.
  • Page 53 Liquidew EExd User’s Manual APPENDIX C Appendix C Software Michell Instruments...

  • Page 54: Appendix C Software

    Appendix C Software Software is available for the Liquidew EExd to provide full remote control of up to 31 instruments. It provides access to all readable and write-able registers as described in Appendix E along with charting and data logging facilities.
  • Page 55 Liquidew EExd User’s Manual APPENDIX D Appendix D Calibration Correction Michell Instruments...

  • Page 56: Appendix D Calibration Correction

    Extract from a Standard Calibration Certificate: Generated Instrument Dew point Display °C °C -40.1 -40.2 -20.1 -20.1 From time to time the Liquidew EExd may be calibrated by an external calibration agency, and similar data will be provided. 97097 Issue 14.1, November 2019...

  • Page 57: Figure 31 Calibration Correction Data

    Liquidew EExd User’s Manual APPENDIX D Calibration Software A calibration correction utility has been integrated into the Process Application Software. This allows authorized users to input calibration information in order to effect a real- time correction of the displayed dew point. This software facilitates the uploading and downloading of the instrument's calibration via the Modbus RTU interface.

  • Page 58: Calibration Procedure

    ‘equal & exact’ default values. Connect the Liquidew EExd to a suitable dew-point generator with a reference hygrometer (preferably chilled-mirror type with traceable calibration). Purge the Liquidew for a minimum of 5 days with air that is drier than -100°Cdp (-148°Fdp) before commencing the calibration.
  • Page 59 Liquidew EExd User’s Manual APPENDIX D The purge gas should be as dry as possible, ideally 10°Cdp (18°Fdp) drier than the driest dew point to be calibrated. The recommended stabilization times listed above should be followed when changing from one dew point to the next.
  • Page 60 Liquidew EExd User’s Manual APPENDIX E Appendix E Modbus RTU Communications 97097 Issue 14.1, November 2019...

  • Page 61: Modbus Rtu Communications

    Response From Slave Physical Layer The physical connection from the master to the Liquidew EExd uses 2-wire RS485 plus a ground connection. Data lines A, B and ground are connected to communication connectors within the instrument. The serial port protocol is as follows:...

  • Page 62: Termination Resistor

    Liquidew EExd User’s Manual APPENDIX E Termination Resistor A 120R termination resistor is provided on the instrument’s circuit board for systems that require it. To connect the resistor, place the link provided across JMP2. Register Map The following tables describe the instrument registers with their address location, Modbus function and the number format.
  • Page 63 Liquidew EExd User’s Manual APPENDIX E Register Address Address Read/ Default Function Config- Write Value uration 0025 Internal Temperature 0026 Internal Temp Set Point 0027 Water DP Sensor 2 – Batch Number 0028 Water DP Sensor 2 – Serial Number...
  • Page 64 Liquidew EExd User’s Manual APPENDIX E Register Address Address Read/ Default Function Config- Write Value uration 0053 Occurred @ day (val1) + month (val2) 0054 Occurred @ hour (val1) + min (val2) 0055 Temp average – Sensor 2 0056 Not Used...
  • Page 65 Liquidew EExd User’s Manual APPENDIX E Sensor 1 Calibration Correction Register Address Address Read/ Default Function Config- Write Value uration Sn1 20°Cdp Ref Sn1 10°Cdp Ref Sn1 0°Cdp Ref Sn1 -10°Cdp Ref Sn1 -20°Cdp Ref Sn1 -30°Cdp Ref Sn1 -40°Cdp Ref Sn1 -50°Cdp Ref...
  • Page 66 Liquidew EExd User’s Manual APPENDIX E Sensor 2 Calibration Correction Register Address Address Read/ Default Function Config- Write Value uration Sn2 10°Cdp Ref Sn2 0°Cdp Ref Sn2 -10°Cdp Ref Sn2 -20°Cdp Ref Sn2 -30°Cdp Ref Sn2 -40°Cdp Ref Sn2 -50°Cdp Ref Sn2 -60°Cdp Ref...
  • Page 67 Liquidew EExd User’s Manual APPENDIX E Data Logging Register Address Address Read/ Default Function Config- Write Value uration 0101 Time Hours + Mins @ t 0 0102 Humidity 1 Hi Word @ t 0 0103 Humidity 1 Lo Word Pressure @ t 0...
  • Page 68 Liquidew EExd User’s Manual APPENDIX E User Cs tables Register Address Address Read/ Default Function Config- Write Value uration 1461 05B5 User Cs Table 1, Cs Value at 10°C 1462 05B6 User Cs Table 1, Cs Value at 20°C 1463 05B7 User Cs Table 1, Cs Value at 30°C...
  • Page 69 Liquidew EExd User’s Manual APPENDIX E Register Address Address Read/ Default Function Config- Write Value uration 1505 05E1 User Solute 3 Label Char 6 1506 05E2 User Solute 3 Label Char 7 1507 05E3 User Solute 3 Label Char 8...
  • Page 70 Liquidew EExd User’s Manual APPENDIX F Appendix F Modbus RTU Details 97097 Issue 14.1, November 2019...

  • Page 71: Modbus Rtu Details

    The data bytes within the message from the master contain additional information that the Liquidew EExd must use to perform the action defined in the function code, such as the starting register address and the number of registers to be retrieved.

  • Page 72: Figure 32 Reading Holding Registers State Diagram

    Liquidew EExd User’s Manual APPENDIX F Implemented Functions Read Holding Registers This function code is used to read the contents of a contiguous block of holding registers, where the master specifies the starting address and the number of registers to be read.
  • Page 73 (register 7) and Channel 2 sample temperature (register 8). The message shows a master addressing a Liquidew EExd with a slave address of 01H and a Modbus function of 03H that informs the Liquidew EExd that it wishes to read two registers starting from address 07H.

  • Page 74: Figure 33 Write Single Register State Diagram

    Liquidew EExd User’s Manual APPENDIX F Write to Single Register This function code is used to write a 16 bit value into a single register. The master specifies the address and the value to be written. Figure 34 shows the state diagram of how the message is processed with the exceptions that may be raised.
  • Page 75 1 to 4 contain the address of the Liquidew EExd, Modbus function, starting register address and the data value to be written. In this example a master sends FC18H to address 0015H, to a Liquidew EExd with an address of 01H. The CRC is calculated using the data in bytes 1 to 6.

  • Page 76: Exceptions

    Liquidew EExd User’s Manual APPENDIX F Exceptions A message request from the master will raise an exception response from the slave (Liquidew EExd) if: the function code is unsupported the register quantity > 127 (0x007D) iii. the register address is invalid...
  • Page 77 Liquidew EExd User’s Manual APPENDIX G Appendix G Register Number Formats Michell Instruments...

  • Page 78: Register Number Formats

    Liquidew EExd User’s Manual APPENDIX G Appendix G Register Number Formats Register Configuration A Value  Sign bit = 1 for –ve values (signed int) 7FFF = 327.67 8000 = -327.68 The value in bits (15 to 0) + 1 is divided by 100 to give 0.01 resolution for dew-point and temperature values.
  • Page 79 Liquidew EExd User’s Manual APPENDIX G Register Configuration D - Status Word 15 14 13 12 11 10 9 = ON or Fitted or ERROR = OFF or Not Fitted or NO ERROR Register Configuration E - Units Command 15 14 13 12 11 10 9 = °C...
  • Page 80 Liquidew EExd User’s Manual APPENDIX G Register Configuration I r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w Val 2 Val 1   Val 1 & 2 are in BCD, therefore 10H = 10, 58H = 58 and 09H = 9 etc. As a result A to F are not valid values.
  • Page 81 Liquidew EExd User’s Manual APPENDIX G Examples of floating point to HEX are shown below. +10.3 sign bit Exponent = 3, therefore exponent field = 127 + 3 = 130, and bits 30 to 23 = 1000 0010 Mantissa = 1.2875 which in binary representation = 1010 0100 1100 1100 1100 1101 Adjusting the mantissa for the exponent moves the decimal point to the right if positive and to the left if negative.
  • Page 82 Liquidew EExd User’s Manual APPENDIX H Appendix H Hazardous Area Certification 97097 Issue 14.1, November 2019...

  • Page 83: Appendix H Hazardous Area Certification

    Appendix H Hazardous Area Certification The Liquidew EExd is certified compliant to the ATEX Directive (2014/34/EU) and IECEx for use within Zone 1 and Zone 2 Hazardous Areas and has been assessed so by ELEMENT ROTTERDAM BV (Notified Body 2812).

  • Page 84: Special Conditions Of Use

    Refer to the relevant sections within this manual for the connection, wiring and cable glanding requirements. Maintenance and Installation The Liquidew EExd must only be installed by suitably qualified personnel and in accordance with the instructions provided and the terms of the applicable product certificates.
  • Page 85 Liquidew EExd User’s Manual APPENDIX I Appendix I Quality, Recycling & Warranty Information Michell Instruments...

  • Page 86: Appendix I Quality, Recycling & Warranty Information

    Liquidew EExd User’s Manual APPENDIX I Appendix I 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/uk/compliance This page contains information on the following directives: •...
  • Page 87 Liquidew EExd User’s Manual APPENDIX J Appendix J Return Document & Decontamination Declaration Michell Instruments...

  • Page 88: Appendix J 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 materials. For most applications involving solvents, acidic, basic, flammable or toxic gases a simple purge with dry gas (dew point <-30°C) over 24 hours should be sufficient to decontaminate the unit prior to return.
  • Page 89 Liquidew EExd User’s Manual NOTES: Michell Instruments...
  • Page 90 http://www.michell.com...

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