Michell Instruments Promet EExd User Manual
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Michell Instruments Promet EExd User Manual

Process moisture analyzer
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Promet EExd
Process Moisture Analyzer
User's Manual
97090 Issue 16.1
November 2019

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  • Page 1 Promet EExd Process Moisture Analyzer User’s Manual 97090 Issue 16.1 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

    2.5.3 Analog and Digital Communications ............. 14 2.5.4 Process Alarms and Analyzer Status Alarms ..........14 Promet EExd Start-Up Purge Procedure .............. 15 Sample Gas Flows .................... 16 Sample Flow Alarms (Optional) ................16 OPERATION ....................17 System Operation ..................... 17 User Interface ....................
  • Page 5 4.4.2 Logged Error Codes ..................33 4.4.3 Analyzer Status Alarm Relay................. 34 Figures Figure 1 Promet EExd Sampling System ..............4 Figure 2 Power Connection Connector ...............5 Figure 3 Earthing Stud And Nut Washer Assembly .............6 Figure 4 Promet EExd Mounting Drawing ..............10 Figure 5 Pipework Connections ................11...
  • Page 6 Promet EExd User’s Manual Appendices Appendix A Technical Specifications ................36 Mounting Drawing ............... 38 Pipework Connections ..............39 System Wiring Diagram ..............40 Appendix B Variable Definitions ................... 42 Appendix C Software ....................47 System Requirements ..............47 Appendix D Modbus RTU Communications ..............

  • Page 7: Safety

    Promet EExd User’s Manual Safety This manual contains all the required information to install, operate and maintain the Promet 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

    Promet EExd User’s Manual Abbreviations The following abbreviations are used in this manual: Ampere alternating current barg pressure in bar (gauge) °C degrees Celsius °F degrees Fahrenheit direct current dew point European Union pound lb/MMscf pounds per million standard cubic feet...

  • Page 9: Introduction

    Diagram in Appendix A. Sample Gas Path The Promet EExd analyzer system must be supplied with gas at the required pressure, via a sample gas handling panel providing suitable pressure, filtration & flow control. Sample gas entry and exit ports direct the gas through flame arrestors which, along with the Exd enclosure, provide the explosion proof protection.

  • Page 10: Operating Overview

    User Display and Interface The Promet 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: Measurement Units

    INTRODUCTION Measurement Units The Promet EExd offers complete flexibility for the user to select their preference of hygrometric units. Integral pressure measurement enables unit conversions from dew point to moisture content, or dew point to dew point for different pressure conditions.

  • Page 12: Calibration Maintenance

    Calibration Maintenance Maintenance of calibration is essential to the lifetime performance of all analyzers. To ensure that all customers worldwide can maintain the performance of their Promet EExd, the unique Michell Calibration Exchange Service offers freshly calibrated replacement Ceramic Sensors certified traceable to NPL and NIST. As the calibration characterization...

  • Page 13: Installation

    2.1.1 Equipment Ratings and Installation Details The following mandatory statements refer to the Ex certified Promet 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 Promet 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

    Promet EExd User’s Manual INSTALLATION Hazardous Area Safety Refer to Appendix G 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

    Promet 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

    Promet 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

    In accordance with the Certification requirements, the Promet EExd must have, as a minimum, the components described in Figure 7.
  • Page 20 Promet EExd User’s Manual INSTALLATION The following points should be considered when installing the sample gas 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: Power Connection

    Promet EExd User’s Manual INSTALLATION 2.5.2 Power Connection A single-phase AC power connection is required. The power supply can accommodate voltages from 90 to 260 V AC, 47/63 Hz. The unit requires a maximum of 180 W to function correctly.

  • Page 22: 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 Promet EExd. mA1 and mA3 output the moisture values. mA2 and mA4 output the pressure values of Channels 1 & 2 respectively.

  • Page 23: Promet Eexd Start-Up Purge Procedure

    Before start-up, ensure that all power and signal connections to the Promet EExd are fully isolated Ensure that all Inlet & Outlet gas connections to the Promet EExd are made correctly and are leak tight checked. Fully open the flow control valve of the flow meter of each channel.

  • Page 24: Sample Gas Flows

    100% of the recommended flow setting for a brief period in order to clear the alarm condition. NOTE: If the Promet EExd is going to be operating with significantly different analysis pressures to those used during factory testing then fine re-adjustment of the flow switches may be beneficial to suit the application conditions.

  • Page 25: Operation

    Promet 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. 5, 10, 15 etc. The MAIN Page will show the moisture and pressure readings of either 1 or 2 sensors and a countdown to the time when it will take the next data log.

  • Page 26: Up/Down Arrow' Buttons

    Promet EExd User’s Manual OPERATION 3.2.2 ‘Up/Down Arrow’ Buttons Figure 10 Up/Down Arrow Buttons () and Down ( ) 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 27: Menu Structure

    Promet EExd User’s Manual OPERATION Menu Structure Figure 14 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 28: Main Menu Page

    Promet 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 this page. Use the () and Down ( ) buttons to highlight the page of interest and...

  • Page 29: Logging Menu Page

    Promet 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 30: View Statistics Page

    Promet EExd User’s Manual OPERATION Each page of logged data contains: • Sample number 1 to 150, 1 being the most recent • Date of sample dd/mm • Time of sample 24 hr format, hh:mm • The values of Moisture content/Dew point and Pressure for 1 or 2 channels •...

  • Page 31: View System Faults Page

    Promet EExd User’s Manual OPERATION 3.6.3 VIEW SYSTEM FAULTS Page This page displays a record of the last six system faults that have occurred and have subsequently been corrected. This assists in the diagnosis of any past anomaly in measured values. Any present system faults will be displayed in the bottom message line of the MAIN Page.

  • Page 32: Variables

    Promet EExd User’s Manual OPERATION 3.7.2 VARIABLES Pages Three pages (four pages in the dual channel configuration) are used to display the system variables. They can be adjusted by using the (), Down ( ) and SELECT buttons. Use the () and...

  • Page 33: Dual Channel Configuration Variables Pages

    Promet EExd User’s Manual OPERATION VARIABLES Page 2 Variable Brief Description Dew-point or Pressure value that gives 20 mA on mA2 output OP2max °C/°F Temperature units selection Pressure Pressure units selection System time TIME DATE System date OP2/4 PARAM Adjustable range/options: Measured Dew point, Pressure...

  • Page 34: Sensor Info Page

    Promet EExd User’s Manual OPERATION VARIABLES Page 3 Variable Brief Description Dew-point or Pressure value that gives 4 mA on mA4 output OP4min Dew-point or Pressure value that gives 20 mA on mA4 output OP4max °C/°F Temperature units selection Pressure...

  • Page 35: Contact Info Page

    Promet EExd User’s Manual OPERATION 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 Figure 22 CONTACT INFO Page Michell Instruments...

  • Page 36: Maintenance

    The design of the Promet 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 37: Replacement Of The Moisture Sensor Assembly

    Promet 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 38: Figure 24 Moisture Sensor Assembly Replacement

    Promet 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 and the pressure transducer connection. Disconnect the ribbon cable connectors from the sensor pcb.

  • Page 39: Replacement Of The Flow Switch (If Fitted)

    Promet EExd User’s Manual MAINTENANCE Replacement of the Flow Switch (if fitted) The power to the enclosure must be turned off before any work is carried out in the measurement system enclosure. Observe de-energize durations. Isolate the incoming sample gas line by CLOSING the sample inlet isolation valve and allow the system to depressurize.

  • Page 40: Troubleshooting

    Promet EExd User’s Manual MAINTENANCE Troubleshooting 4.4.1 Error Messages If a system errors occurs, 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 41: Logged Error Codes

    Promet EExd User’s Manual MAINTENANCE 4.4.2 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 42: Analyzer Status Alarm Relay

    Promet EExd User’s Manual MAINTENANCE If more than one error has occurred, then the error codes will be added together, e.g. Error Code 0104 Error Code 0100 (Channel 2 sensor over range) plus Error Code 0004 ( Channel 1 temperature device fault) (...
  • Page 43 Promet EExd User’s Manual APPENDIX A Appendix A Technical Specifications Michell Instruments...

  • Page 44: Appendix A Technical Specifications

    Promet EExd User’s Manual APPENDIX A Appendix A Technical Specifications Main Unit – Measurement Parameters Channel Configuration Single and dual channel Moisture Parameters Dew point °C and °F / Pressure Automatic pressure compensated conversions: for natural gas and ideal gas...
  • Page 45 Promet EExd User’s Manual APPENDIX A Enclosure Internal temperature control for condensation protection and stable Main Unit Enclosure analysis conditions Type Flameproof EExd Construction Cast copper-free aluminum Finish Chromate primer, Polyester P9010 powder coated (black) Meets BS3900 General Operating Pressure Max.

  • Page 46: Figure 27 Mounting Drawing

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

  • Page 47: Figure 28 Pipework Connections

    Promet EExd User’s Manual APPENDIX A Pipework Connections Figure 28 Pipework Connections Michell Instruments...

  • Page 48: Figure 29 System Wiring Diagram

    Promet EExd User’s Manual APPENDIX A System Wiring Diagram COMMS Channel 1 Channel 2 NC C NO NC C NC C NO NC C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19...
  • Page 49 Promet EExd User’s Manual APPENDIX B Appendix B Variable Definitions Michell Instruments...

  • Page 50: Appendix B Variable Definitions

    Promet 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 51 Promet EExd User’s Manual APPENDIX B Variable: OP2MIN (single channel), OP4MIN 0.1 - 25.0 MPa/0 - 250 barg/0 - 3000 psig (for Pressure) Adjustable Range/Options: -100 to +100°C/-148 to +212°F (for Dew point) Description: The minimum dew-point or pressure value that 4 mA represents for the respective output.
  • Page 52 Promet EExd User’s Manual APPENDIX B TIME Variable: hh:mm; 00:00 to 23:59 Adjustable Range/Options: Description: The real-time clock in 24hr format. Minutes and hours may be adjusted. Down ( Pressing either the () or ) buttons will increment or decrement the minute’s field and the corresponding hours field will change automatically.
  • Page 53 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 Promet EExd instrument in the network. Variable: INT TEMP SP Adjustable Range/Options: -20 to +60°C...
  • Page 54 Promet EExd User’s Manual APPENDIX C Appendix C Software 97090 Issue 16.1, November 2019...

  • Page 55: Appendix C Software

    Appendix C Software Software is available for the Promet 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 56 Promet EExd User’s Manual APPENDIX D Appendix D Modbus RTU Communications 97090 Issue 16.1, November 2019...

  • Page 57: Modbus Rtu Communications

    Response From Slave Physical Layer The physical connection from the master to the Promet 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 58: Figure 30 Calibration Correction Data

    Promet EExd User’s Manual APPENDIX D Termination Resistor A 120 Ω 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 59 Promet EExd User’s Manual APPENDIX D Register Address Address Read/ Default Function Config- Write Value uration 0023 Error Indicator 0024 Not Used 0025 Internal Temperature 0026 Internal Temp Set Point 07D0H 0027 Moisture Sensor 2 – Batch Number 0028 Moisture Sensor 2 – Serial Number...
  • Page 60 Promet EExd User’s Manual APPENDIX D Register Address Address Read/ Default Function Config- Write Value uration 0051 Occurred @ day (val1) + month (val2) 0052 Occurred @ hour (val1) + min (val2) 0052 Pressure min – Sensor 2 0053 Occurred @ day (val1) + month (val2)
  • Page 61 Promet EExd User’s Manual APPENDIX D Data Logging 0100 Date Day + Month @ t 0 0101 Time Hours + Mins @ t 0 0102 Moisture 1 Hi Word @ t 0 0103 Moisture 1 Lo Word Pressure @ t 0...
  • Page 62 Promet EExd User’s Manual APPENDIX E Appendix E Modbus RTU Details 97090 Issue 16.1, November 2019...

  • Page 63: Modbus Rtu Details

    See Appendix E on setting the address. Function Code The function code tells the Promet EExd which operation is to be performed on the data in the following data bytes. The only valid codes are 03 (Read Holding Registers) 06 (Write To Single Register) as these are the only two implemented.

  • Page 64: Implemented Functions

    Promet EExd User’s Manual APPENDIX E 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 65 (register 7) and Channel 2 gas temperature (register 8). The message shows a master addressing a Promet EExd with a slave address of 01H and a Modbus function of 03H that informs the Promet EExd that it wishes to read two registers starting from address 07H.
  • Page 66 Promet EExd User’s Manual APPENDIX E Write to Single Register This function code is used to write a 16 bit value into a single register, whereby the master specifies the address and the value to be written. Figure 33 shows the state diagram of how the message is processed with the exceptions that may be raised.
  • Page 67 4 contain the address of the Promet 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 Promet EExd with an address of 01H. The CRC is calculated using the data in bytes 1 to 6.

  • Page 68: Exceptions

    Promet EExd User’s Manual APPENDIX E Exceptions A message request from the master will raise an exception response from the slave (Promet EExd) if: the function code is unsupported the register quantity > 127 (0x007D) iii. the register address is invalid...
  • Page 69 Promet EExd User’s Manual APPENDIX F Appendix F Register Number Formats Michell Instruments...

  • Page 70: Figure 31 Reading Holding Registers State Diagram

    Promet EExd User’s Manual APPENDIX F Appendix F 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 71 Promet EExd User’s Manual APPENDIX F Register Configuration C – Error Conditions Error Condition 0001 Sensor 1 under range 0002 Sensor 1 over range 0004 Sensor 1 temperature fault 0008 Sensor 1 No flow 0010 Sensor 1 pressure transmitter failure...

  • Page 72: Figure 32 Write Single Register State Diagram

    Promet EExd User’s Manual APPENDIX F Register Configuration E - Units Command r/w r/w r/w r/w = ON / Fitted / Initiate = OFF or Not Fitted Register Configuration F 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 Unsigned integer.
  • Page 73 Promet EExd User’s Manual APPENDIX F 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 74 Promet EExd User’s Manual APPENDIX F 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 = 10000010 Mantissa = 1.2875 which in binary representation = 1 .01001001 1001 1001 1001 101 Adjusting the mantissa for the exponent moves the decimal point to the right if positive and to the left if negative.
  • Page 75 Promet EExd User’s Manual APPENDIX G Appendix G Hazardous Area Certification Michell Instruments...

  • Page 76: Hazardous Area Certification

    Appendix G Hazardous Area Certification The Promet 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 77: Special Conditions Of Use

    Maintenance and Installation The Promet EExd must only be installed by suitably qualified personnel and in accordance with the instructions provided and the terms of the applicable product certificates. Maintenance and servicing of the product must only be carried out by suitably trained personnel or returned to an approved Michell Instruments’...
  • Page 78 Promet EExd User’s Manual APPENDIX H Appendix H Pressure Equipment Directive Compliance Statement 97090 Issue 16.1, November 2019...

  • Page 79: Appendix H Pressure Equipment Directive Compliance Statement

    Our equipment has been assessed and is classified according to the classification charts detailed in Annex II of these regulations as falling into the Sound Engineering Practice (SEP) Conformity Assessment Category. Michell Instruments Ltd warrants that its equipment has been designed and manufactured according to SEP. Michell Instruments...
  • Page 80 Promet EExd User’s Manual APPENDIX I Appendix I Quality, Recycling & Warranty Information 97090 Issue 16, April 2019...

  • Page 81: Appendix I Quality, Recycling & Warranty Information

    Promet 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/compliance This page contains information on the following directives: •...
  • Page 82 Promet EExd User’s Manual APPENDIX J Appendix J Return Document & Decontamination Declaration 97090 Issue 16.1, November 2019...

  • Page 83: 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 84 http://www.michell.com...

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