Michell Instruments Promet EExd Operating Manual

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Promet EExd

Process Moisture Analyzer

User’s Manual

97090 Issue 16

April 2019

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Promet EExd

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Promet EExd User’s Manual

Contents

Safety ...............................................................................................................................vii

Electrical Safety ..........................................................................................................vii

Pressure Safety ...........................................................................................................vii

Toxic Materials ............................................................................................................vii

Repair and Maintenance .............................................................................................. vii

Calibration (factory validation) .....................................................................................vii

Safety Conformity .......................................................................................................vii

Abbreviations .................................................................................................................... viii

Warnings .......................................................................................................................... viii

1 INTRODUCTION ................................................................................................1

1.1 General .............................................................................................................. 1

1.2 Sample Gas Path ................................................................................................ 1

1.3 Operating Overview ............................................................................................ 2

1.4 User Display and Interface .................................................................................. 2

1.5 Advanced Sensor Technology .............................................................................. 2

1.6 Measurement Units ............................................................................................. 3

1.7 Elimination of Temperature Effects ....................................................................... 3

1.8 Calibration Maintenance ...................................................................................... 4

1.9 Promet EExd Sampling System ............................................................................ 4

2 INSTALLATION ..................................................................................................5

2.1 Electrical Safety .................................................................................................. 5

2.1.1 Equipment Ratings and Installation Details ...................................................... 5

2.2 Hazardous Area Safety ........................................................................................ 8

2.3 Pressure Safety .................................................................................................. 9

2.4 Lifting and Handling ........................................................................................... 9

2.5 Analyzer System ............................................................................................... 10

2.5.1 Pipework .................................................................................................... 11

2.5.2 Power Connection ...................................................................................... 13

2.5.3 Analog and Digital Communications ............................................................. 14

2.5.4 Process Alarms and Analyzer Status Alarms .................................................. 14

2.6 Promet EExd Start-Up Purge Procedure .............................................................. 15

2.7 Sample Gas Flows ............................................................................................ 16

2.8 Sample Flow Alarms (Optional) .......................................................................... 16

3 OPERATION ....................................................................................................17

3.1 System Operation ............................................................................................. 17

3.2 User Interface .................................................................................................. 17

3.2.1 Interface Controls ....................................................................................... 17

3.2.2 ‘Up/Down Arrow’ Buttons ............................................................................. 18

3.2.3 ‘SELECT’ Button .......................................................................................... 18

3.2.4 ‘MENU/MAIN’ Button ................................................................................... 18

3.3 Menu Structure ................................................................................................ 19

3.4 MAIN MENU Page ............................................................................................. 20

3.5 STATUS Page ................................................................................................... 20

3.6 LOGGING MENU Page ....................................................................................... 21

3.6.1 VIEW LOGGED DATA Page ........................................................................... 21

3.6.2 VIEW STATISTICS Page ............................................................................... 22

3.6.3 VIEW SYSTEM FAULTS Page ........................................................................ 23

3.7 VIEW/ADJ VARIABLES Page .............................................................................. 23

3.7.1 Password .................................................................................................... 23

3.7.2 VARIABLES Pages ....................................................................................... 24

3.7.3 Single Channel Configuration VARIABLES Pages ............................................ 24

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Promet EExd User’s Manual

3.7.4 Dual Channel Configuration VARIABLES Pages .............................................. 25

3.8 SENSOR INFO Page .......................................................................................... 26

3.9 CONTACT INFO Page ....................................................................................... 27

4 MAINTENANCE ................................................................................................28

4.1 Enclosure Cover and User Interface ................................................................... 28

4.2 Replacement of the Moisture Sensor Assembly ................................................... 29

4.3 Replacement of the Flow Switch (if fitted) .......................................................... 31

4.4 Troubleshooting ................................................................................................ 32

4.4.1 Error Messages ........................................................................................... 32

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

Figure 6 Hook-up Wiring Diagram ...........................................................................13

Figure 7 Minimum Requirements for Start-up Purging ..............................................16

Figure 8 MAIN Page in Single Channel (top) and Dual Channel Modes .......................17

Figure 9 User Interface ..........................................................................................17

Figure 10 Up/Down Arrow Buttons ...........................................................................18

Figure 11 ‘SELECT’ Button ........................................................................................18

Figure 12 ‘MENU/MAIN’ Button .................................................................................18

Figure 13 Menu Structure ........................................................................................19

Figure 14 MAIN MENU Page .....................................................................................20

Figure 15 STATUS Page ...........................................................................................20

Figure 16 LOGGED DATA Page .................................................................................21

Figure 17 STATISTICS Page .....................................................................................22

Figure 18 LOGGED ERROR Page ...............................................................................23

Figure 19 PASSWORD Page ......................................................................................23

Figure 20 VARIABLES Page ......................................................................................24

Figure 21 SENSOR INFO Page ..................................................................................26

Figure 22 CONTACT INFO Page ................................................................................27

Figure 23 Ribbon Cable Connection ..........................................................................29

Figure 24 Moisture Sensor Assembly Replacement .....................................................30

Figure 25 Error Message Line ...................................................................................32

Figure 26 Logged Error Codes ..................................................................................33

Figure 27 Mounting Drawing ....................................................................................38

Figure 28 Pipework Connections ...............................................................................39

Figure 29 System Wiring Diagram .............................................................................40

Figure 30 Calibration Correction Data........................................................................50

Figure 31 Reading Holding Registers State Diagram ...................................................62

Figure 32 Write Single Register State Diagram ...........................................................64

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Promet EExd User’s Manual

Appendices

Appendix A Technical Specifications ..............................................................................36

A.1 Mounting Drawing ....................................................................... 38

A.2 Pipework Connections ..................................................................39

A.3 System Wiring Diagram ................................................................40

Appendix B Variable Definitions ...................................................................................42

Appendix C Software ................................................................................................... 47

C.1 System Requirements ..................................................................47

Appendix D Modbus RTU Communications .................................................................... 49

D.1 Introduction ................................................................................ 49

D.2 Modbus RTU Basics ...................................................................... 49

D.3 Physical Layer ............................................................................. 49

D.4 Termination Resistor .................................................................... 50

D.5 Register Map ............................................................................... 50

Appendix E Modbus RTU Details ..................................................................................55

E.1 Message Framing .........................................................................55

E.2 Implemented Functions ................................................................56

E.3 Exceptions ..................................................................................60

Appendix F Register Number Formats...........................................................................62

Appendix G Hazardous Area Certification ......................................................................68

G.1 Product Standards .......................................................................68

G.2 Product Certification ....................................................................68

G.3 Global Certificates/Approvals ........................................................ 68

G.4 Special Conditions of Use ............................................................. 69

G.5 Maintenance and Installation ........................................................69

Appendix H Pressure Equipment Directive Compliance Statement ................................... 71

Appendix I Quality, Recycling & Warranty Information ...................................................73

Appendix J Return Document & Decontamination Declaration ........................................75

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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 certicates. Incorrect installation and use of this product for other than its intended purpose will render all warranties void.

This product is intended for use in a Hazardous Area and is awarded an ATEX, IECEx and CSA Certicate. The relevant certicates should be fully examined prior to installation or use of this product.

Where this hazard warning symbol appears in the following

sections, it is used to indicate areas where potentially hazardous

operations need to be carried out and where particular attention to

personal and personnel safety must be observed.

Electrical Safety

The instrument is designed to be completely safe when used with options and accessories supplied by the manufacturer for use with the instrument. The input power supply voltage limits are 90 to 260 V AC, 47/63 Hz.

Pressure Safety

DO NOT permit pressures greater than the safe working pressure to be applied directly to the instrument. Refer to the Technical Specications in Appendix A.

Toxic Materials

The use of hazardous materials in the construction of this instrument has been minimized. During normal operation it is not possible for the user to come into contact with any hazardous substance which might be employed in the construction of the instrument. Care should, however, be exercised during maintenance and the disposal of certain parts.

Repair and Maintenance

The instrument must only be maintained either by the manufacturer or an accredited service agent. Refer to www.michell.com for details of Michell Instruments’ worldwide oces contact information.

Calibration (factory validation)

Prior to shipment, the analyzer undergoes stringent factory calibration to internationally traceable standards, NPL (UK) and NIST (USA). Due to the inherent stability of the instrument, only periodic calibration is required under normal operating conditions.

Michell Instruments recommends that calibration of the sensor should be maintained on a 12 monthly basis to ensure optimum operation. Michell Instruments oers a calibration exchange program, where a refurbished and re-certied sensor is supplied as an operational replacement and the original item returned to Michell to complete the exchange.

NOTE: This interval may need to be reduced if the operation of the sensor is within potentially aggressive or corrosive sample media (such as sour natural gas). The calibration interval may therefore need to be shortened to 6 months (or lower in extreme cases) in order to maintain satisfactory analyzer performance.

Safety Conformity

This product meets the essential protection requirements of the relevant EU directives. Further details of applied standards may be found in the product specication.

Michell Instruments vii

Abbreviations

The following abbreviations are used in this manual:

A Ampere AC alternating current barg pressure in bar (gauge) °C degrees Celsius °F degrees Fahrenheit DC direct current dp dew point EU European Union lb pound lb/MMscf pounds per million standard cubic feet lbf-ft pound force per foot kg kilogram mA milliampere max maximum min minute(s) mg/m3 milligrams per cubic meter mm millimeters mV millivolt(s) N/C normally closed N/O normally open Nl/min normal liters per minute ppmV parts per million by volume psig pressure in pound(s) per square inch (gauge) RH relative humidity scfh standard cubic feet per hour temp temperature V Volts

Promet EExd User’s Manual

Warnings

The following general warnings listed below are applicable to this instrument. They are repeated in the text in the appropriate locations.

Where this hazard warning symbol appears in the following

sections it is used to indicate areas where potentially

hazardous operations need to be carried out.

Where this symbol appears in the following sections it is used

to indicate areas of potential risk of electric shock.

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1 INTRODUCTION

1.1 General

The Promet EExd is designed for continuous, automatic measurement of the moisture content of processed natural gas, utilizing the Michell Ceramic Moisture Sensor. It is the result of more than 30 years’ experience in the supply of analyzers to the Worldwide Oil & Gas Industry.

The analyzer comprises either a single or a dual channel moisture measurement sensor cell, control electronics and a display interface housed in an Exd enclosure. The analyzer is ATEX Directive, IECEx or cCSAus compliant for use in a Zone 1 or 2 Hazardous Area and Class I, Div 1 Hazardous Location. See marking label located on right hand side of analyzer to identify approvals. An accompanying sample handling panel, designed to be positioned close to the process sample point to prepare the sample prior to entry into the Promet EExd, can also be supplied.

The instrument offers several user-selectable display options based on a calibrated dew-point measurement range of -100 to +20°C (-148 to +68°F), traceable to the humidity metrology standards of NPL (UK) and NIST (USA). The instrument further provides indication only in the ranges of +20 to +30°Cdp (+68 to +86°Fdp) and -100 to

-120°Cdp (-148 to -184°F), equating to a moisture measurement capability of <1ppbV to >30,000 ppmV.

INTRODUCTION

The requirements for operation are a 90 to 260 V AC, 47/63 Hz power supply of 180W and field communications Modbus RTU and/or 4-20 mA. Refer to the System Wiring Diagram in Appendix A.

1.2 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. 1 or 2 separate measurement channels can be accommodated within the instrument.

The measurement system components are housed within a cast aluminum Exd rated enclosure. The enclosure has a screw cover incorporating a sealed window. It is chromate primed, polyester coated in black, and provides environmental protection to IP66/NEMA 4. An enclosure breather is fitted in the form of an additional flame arrestor. It is important that no pipe connection is made to this breather and that no restriction is allowed to occur.

All sample gas-wetted metallic parts are manufactured in AISI 316L stainless steel with Viton soft parts that comply with the NACE standard MR-01-75 (latest edition). Tube fittings are twin ferrule compression type. All electrical and gas connections are made through the base of the enclosure. Refer to the Mounting Drawing in Appendix A.

Channel 1 flow components comprise the following:

• (Optional) Flow Switch 1 (FS1): Provides indication that a flow

is present throughout the moisture measurement stream

• Pressure Transducer 1 (PT1): Provides the measurement of

the sample gas pressure within the moisture measurement cell

Michell Instruments 1

INTRODUCTION

Channel 2 flow components comprise the following:

• (Optional) Flow Switch 2 (FS2): Provides indication that a flow

is present throughout the moisture measurement stream

• Pressure Transducer 2 (PT2): Provides the measurement of

the sample gas pressure within the moisture measurement cell

1.3 Operating Overview

The system continuously measures dew point/moisture and pressure in an uninterrupted gas stream flow. The flow switch, if fitted, will notify the system if the gas flow falls below the recommended rate.

Moisture and pressure for each channel are logged at a user-defined interval. The logs are available through the user interface or via the serial communications. Two 4–20 mA outputs for each channel are available to remotely read the dew point/moisture and pressure in real time.

Promet EExd User’s Manual

1.4 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. During normal operation of the instrument the cover must remain fully secured.

1.5 Advanced Sensor Technology

The Promet EExd utilizes the Michell Ceramic Moisture Sensor, an advanced impedance sensor technology with more than 1,000 installations in natural gas and petrochemical applications today. Semiconductor thick- and thin-film technologies combine in metallized ceramics and achieve a durable sensor with measurement capability from lower than 10 ppbV moisture content and high-pressure capability up to 138 barg (2000 psig).

Unlike older aluminum-oxide technologies, the inherent immunity to pressure shock of the Ceramic Sensor avoids the risk of sensor failure at commissioning or shut-down. The inert nature of the sensor gives long-term resistance to chemical attack, even in extremely sour gas with percentage level H2S concentrations. The Ceramic Sensor response characteristic is proportional to the partial pressure of water vapor in the gas

being measured, which is directly related to the dew-point temperature.

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1.6 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.

The available units of dew point/moisture content are as follows:

Dew-Point Temperature

• °C or °F dew point

• °C or °F dew point calculated for a set pressure level input by

the user, for either ideal or natural gas

Moisture Content (parts per million)

• ppmV for ideal gas (Ppm(v) IG)

• ppmV for natural gas (Ppm(v) NG)

INTRODUCTION

Moisture Content (pounds per million standard cubic feet)

• lb/MMscf for natural gas (LBMMSCF)

Milligrams per normal cubic meter

• mg/m3 natural gas (mgm-3)

The firmware of the Promet EExd incorporates conversion data for ideal gases and natural gas. For natural gas the conversions are performed based on the long established IGT Research Bulletin No. 8 or the recently published ISO 18453, to customer order preference.

1.7 Elimination of Temperature Effects

To ensure continuous optimum analysis conditions the Promet EExd Main Unit is temperature controlled (internally) at a stable level. The control temperature level is selected to suit the climate at the point of installation, being set to the normal maximum temperature. Such steady state control within the analyzer greatly reduces the effects of diurnal (day-night) swings in temperature. These temperature changes could induce transitional adsorption and desorption effects of the flowing sample, resulting in erroneous measurements.

In addition, the Promet EExd utilizes an advanced temperature compensation algorithm that automatically maintains best possible measurement accuracy in the event of heater

failure or if the prevailing climate exceeds the set temperature level.

Michell Instruments 3

INTRODUCTION

1.8 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 data for each Promet EExd Sensor is programmed into on-board non-volatile memory, fitment of the Calibration Exchange Sensor refreshes the calibration, returning the measurement performance to day-one with down-time of only a few minutes while the interchange is made. No programming or data input is required by the user to complete this. The calibration exchange is available globally on swift delivery, typically less than two weeks, and at the same or less then the cost of a traditional ‘return to manufacturer’ re-calibration service.

The recommended calibration maintenance interval is 12 months for sweet gases and 6 months for sour gases.

Michell recognises that some customers wish to carry out their own calibration adjustments in the field using either a portable dew-point generator (ATSM D5454), or against a calibrated reference hygrometer or certified moisture-in-gas cylinders. The Promet EExd accommodates all such needs within the operating firmware that offers user-friendly access to the calibration characterization table for re-calibration adjustments to be made at just one point (for example, using a certified cylinder gas) or multiple points (using a field generator) across the measurement range.

1.9 Promet EExd Sampling System

Promet EExd User’s Manual

(Optional – see separate manual if you have purchased this item)

Figure 1

Promet EExd Sampling System

Good sample conditioning and handling is particularly important in the field of moisture measurement. As the moisture sensor has to be exposed directly to the process liquid stream in order to detect the dissolved moisture present, key sampling issues such as the avoidance of particulate contamination are imperative to successful operation. Michell’s 30 years of expertise in on-line process moisture analyzers are used to optimize the design of the Promet EExd Sampling Systems.

Contact Michell Instruments for further details: www.michell.com.

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Promet EExd User’s Manual

2 INSTALLATION

2.1 Electrical Safety

During the installation of this product ensure that all

applicable national and local electrical safety regulations

Always ensure that power is switched off prior to accessing the product for any purpose other than normal operation or

INSTALLATION

WARNING:

are observed.

WARNING:

Isolate the power prior to installation.

WARNING:

prior to disconnecting any cables.

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. Maximum power rating is 180 W.

The power is connected via PL1 on the mains connector PCB.

Figure 2

All input and output connectors are 2-part PCB mounted type, rated at 300 V 10 A.

The detachable, screw terminal half of each connector is designed to accept 0.5 to

2.5mm2 [24 -12 AWG] stranded or solid conductors.

Power Connection Connector

Michell Instruments 5

INSTALLATION

Any power connection cable should be 3 core over sleeved, with minimum 0.5mm insulation and rated at 300 V. Cables should have Live (L), Neutral (N) and Earth [Ground] (E) conductors. Ensure suitably rated power supply cables and glands are used to ensure that electrical safety is maintained. Connect each of the Live (L), Neutral (N) and Earth [Ground] (E) conductors to the similarly marked terminals (L, N, E) on the Power In connector shown in Figure 3 above. Ensure the power supply can deliver sufficient power consumption requirement.

Any power supply terminals and voltages must be suitably separated from the other I/O requirements of this product.

Before applying power, perform a continuity test to ensure that the power supply cable and product are effectively connected to the protective Earth.

The Protective Earth terminal is mounted internally and the Earth wire connected to it should never be disconnected. The product enclosure is supplied with an external earth stud at the lower right hand side. At installation, connect this earth stud to plant earth by a minimum 4mm2 earthing bonding. M6 stud and 2 off M6 nuts and washers, all nickel plated.

Promet EExd User’s Manual

Figure 3

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 for temperatures up to +31°C (+88°F) decreasing linearly to 50% RH at +50°C (+122°F). Supply voltages of ±10% and transient over voltages up to Overvoltage Category II. Pollution Degree 2. Altitudes up to 2000m. Outdoor mounting is permitted using suitably rated glands equivalent to NEMA 4 / IP66. See Appendix A, Technical

Specification, for full operating parameters.

Do not remove or exchange any of the cables or electrical components supplied with this product. Doing so will invalidate all warranties.

There are no additional or special electrical safety requirements other than those referred to in this manual.

Earthing Stud And Nut Washer Assembly

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Promet EExd User’s Manual

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. An over-current protection device should be rated to a maximum of 10 A.

This equipment and all power isolation devices must be installed in a location and position that allows safe and easy access to their operation and is able to rigidly support the equipment.

Do not install this equipment in a location that would expose it to impact or high levels of vibration.

Operation of this equipment, other than in a manner specified by the manufacturer, may impair the safety protections provided.

The safe installation of this equipment and any system incorporating this equipment is the responsibility of the installer. Ensure local regulations and requirements are referred to prior to any installation commencing.

INSTALLATION

Michell Instruments 7

INSTALLATION

2.2 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.

During all installation and operation activities, local regulations and permitted working routines must be observed. Installation should only be performed by competent personnel and in accordance with the latest version of IEC/EN60079-14 or local equivalent.

Repair and servicing of this equipment must only be carried out by the manufacturer.

An Installation and Maintenance Information Sheet is supplied separately to the manual.

This product is certified safe for use in a Zone 1 and Zone 2

area only. This product must not be installed or used within

Promet EExd User’s Manual

WARNING:

a Zone 0 area.

WARNING:

This product must not be operated within an explosive

atmosphere greater than 1.1 bara.

WARNING:

This product must not be operated with enriched oxygen

gas samples (more than 21% oxygen content).

WARNING:

This product must not be operated outside of the

temperature range of -40 to +60°C

WARNING:

The enclosure of this product provides Exd protection, partly

through the threads used for mounting the lid, stopping

plugs and cable gland. At all times effort should be made to

ensure these threads are suitably protected from damage

and that only appropriately rated mating parts are applied

to them, in accordance with the certifying requirements.

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Promet EExd User’s Manual

2.3 Pressure Safety

This product is used in conjunction with pressurized gases.

Observe pressurized gas handling precautions.

Pressurized gas should only handled by suitably trained personnel.

INSTALLATION

WARNING:

Pressurized gas is dangerous.

This product requires pressurized gas to be connected to it. Observe pressurized gas handling regulations. Only suitably trained personnel should carry out tasks that include the use of pressurized gas mediums.

2.4 Lifting and Handling

Personnel must observe suitable lifting and handling precautions.

This product is not designed as portable or transportable equipment. It should be rigidly fixed in position as per the full installation instructions.

The weight of the analyzer is in excess of 18kg. Therefore, appropriate lifting and handling techniques should be used during the installation process. Before commencing any lifting or handling ensure that its intended location is suitable and appropriately prepared. Make sure that mounting point design considerations have employed locally approved safety factors.

WARNING:

This instrument is in excess of 18kg.

When handling and installing this product (particularly after removal from its packaging) ensure that it is not dropped, impacted or subjected to high levels of vibration or environmental conditions that may impair its operation.

Michell Instruments 9

INSTALLATION

2.5 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.

Height: 355mm (13.9”)

500mm (19.68”) including installation clearance Width: 310mm (12.20”) 500mm (19.68”) including installation clearance Depth: 245mm (9.64”)

The enclosure provides environmental ingress protection IP66 and should be mounted vertically in a location free of any appreciable vibration. It should be placed in a shaded position to prevent heating effects through sun radiation.

Promet EExd User’s Manual

The weight of the analyzer is 21kg (46lbs).

245mm 9.65"

355mm [13.9"]

Sample out - Channel 1

1/8" NPT Female (ATEX/IECEx/CSA)

Sample in - Channel 1

1/8" NPT Female (ATEX/IECEx/CSA)

290mm [11.41"]

Flame Arrestor

270mm 10.63"

4 o M12 (1/2") Clearance

318mm 12.52"

Enclosure Breather Flame Arrestor Do NOT obscure

Sample Out - Channel 2 (Optional) Flame Arrestor 1/8" NPT Female (ATEX/IECEx/CSA)

Sample In - Channel 2 (Optional) Flame Arrestor 1/8" NPT Female (ATEX/IECEx/CSA)

Cable Entry Glands 3 o M20 (ATEX) 3 o 1/2" NPT (CSA)

Figure 4

310mm [12.20"]

Promet EExd Mounting Drawing

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Promet EExd User’s Manual

2.5.1 Pipework

CHANNEL 1 CHANNEL 2

MICHELL MOISTURE SENSOR

PRESSURE TRANSMITTER

MICHELL MOISTURE SENSOR

INSTALLATION

PRESSURE TRANSMITTER



GAS SAMPLING BLOCK

FLOW

SWITCH

(optional)



ARRESTORS

GAS IN GAS OUT



FLAME



FLAME

ARRESTOR

BREATHER



GAS SAMPLING BLOCK

FLOW

SWITCH

(optional)



ARRESTORS

GAS IN GAS OUT



FLAME



Figure 5

Pipework Connections

Note: Ensure that the process sample gas supply line is well flushed through to clear any liquids and debris present prior to connection to the instrument. A sample handling system must prepare the gas in terms of pressure regulation and filtration before entering into the measurement system.

In accordance with the Certification requirements, the Promet EExd must have, as a minimum, the components described in Figure 7.

The pipework connections are as follows:

Water dew-point Channel 1 Gas Sample inlet

(Maximum pressure of 138 barg (2000 psig))

Water dew-point Channel 1 Gas Sample outlet

(Vent to atmosphere or low pressure are line)

1/8” NPT(F)

Water dew-point Channel 2 Gas Sample inlet

(Maximum pressure of 138 barg (2000 psig))

Water dew-point Channel 2 Gas Sample outlet

(Vent to atmosphere or low pressure are line)

Michell Instruments 11

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.

It is recommended that Viton is used for all O-rings.

Care and attention to the position and installation of the piping will minimize problems caused by avoidable contamination of the measurement system. The most common cause of difficulty is the accumulation of liquid in impulse lines during a shutdown period. If the measurement system has not been isolated on restart-up, condensate can be displaced into components and associated pipe work within the measurement system.

If this event follows a period when process lines may have been contaminated by nonhydrocarbons, e.g. glycol, corrosion inhibitors, etc., the problem is magnified. Similarly, difficulty will be encountered in sample gases carrying liquids, including hydrocarbon liquids.

Promet EExd User’s Manual

Our recommendations are:

• The sampling point on the process line should be on the top of the pipe. If a radial probe is used, the orifice should face downstream. Sample should be taken from middle 1/3 pipe internal diameter.

• The internal volume of the impulse tubing between the process line and any sampling system should be as low as possible (sample lines should be kept as short as possible) to minimize response lag time to changing process conditions.

• Piping should be lagged and/or trace heated if ambient temperatures could cause the sample gas to fall below its dew-point temperature.

• A drain valve should be placed at the low point (if any) in the system.

• It should be standard procedure to isolate the measurement system

during shutdowns or when plant problems are being experienced. The supply lines must be fully purged before restarting.

• The relatively large area of surfaces and internal volume of pressure regulators can be particularly troublesome if contamination is experienced. Prolonged purging with gas may be necessary to remove the contamination. Stripping and cleaning, followed by purging of the system, is preferred.

• Avoid sample gas streams that are already very close to the dew point or which have dispersed liquid (not necessarily hydrocarbon) burden. In such cases, sampling from fast loops and/or from downstream of existing catch pot/coalesce systems is always preferred.

NOTE: Failure to observe these recommendations will potentially cause problems of contamination as well as causing consequential inaccurate, unreliable and inconsistent monitoring. If a top-entry sample point is not available, extra attention should be given to the design of the sample line installation to avoid unwanted contamination.

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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.

The connection is made via a two-part connector mounted at the base of the unit. See Appendix A.

Cable entry into the measurement system is made through the bottom of the enclosure.

• For ATEX/IECEx compliant versions of the product 3 off ISO M20 tapped holes are provided

• For cCSAus compliant version of the product 3 off ½” NPT entries are provided

INSTALLATION

NOTE: For ATEX/IECEx installations EExd Stopping Glands MUST be used when installing. Refer to the separate Installation & Maintenance Information sheet supplied.

The terminals are marked:

L = Live N = Neutral E = Earth

AL3AL2AL1 AL4 COMMS Channel 1 Channel 2

mA1+

mA1-

mA2+

NC C NO NC C NO

1 2 3 4 5 6

NC C NO NC C NO

PL16

7 8 9 10 11

B A GND

PL20 PL15 PL14 PL19

13 14 15

16 17 18 19 20 21 22 23

mA2-

mA3+

mA3-

mA4+

mA4-

L E N



Enclosure wall



Gland

Cable screen

Figure 6

Hook-up Wiring Diagram

Michell Instruments 13

INSTALLATION

2.5.3 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.

NOTE: The maximum output resistance for the 4-20 mA outputs is 500Ω.

See Section 3.7 for setting the 4-20 mA outputs via the user interface and Appendix F for setting the outputs via the Modbus interface.

Refer to Figure 6 for cable wiring.

2.5.4 Process Alarms and Analyzer Status Alarms

Promet EExd User’s Manual

Each channel has an associated process and fault alarm, as shown below:

AL1: Channel 1 process alarm AL2: Channel 1 fault alarm AL3: Channel 2 process alarm AL4: Channel 2 fault alarm

Each alarm relay features Normally Open (N/O), Normally Closed (N/C) and Common (C) contacts.

The process alarm contacts change state when the moisture value is greater than the alarm set point.

The fault alarm contacts change state when an error associated with the channel occurs, or when there is a supply failure.

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2.6 Promet EExd Start-Up Purge Procedure

This is a mandatory procedure stipulated in the ATEX/

IECEx certification of the product. The procedure must be

fully carried out prior to the Promet EExd having any power

or signal connections applied. It must also be fully carried

out after the Promet EExd and associated gas handling

equipment has been installed and leak checked. Always

refer to Appendix G.4 - Special Conditions of Safe Use.

This procedure must be carried out at any time following

service or maintenance periods that cause any of the Promet

EExd or associated gas handling equipment pipe work to be

disconnected.

INSTALLATION

It is not necessary to carry out this procedure if power or

signal connections only have been disconnected.

1. Before start-up, ensure that all power and signal connections to the Promet EExd are fully isolated

2. Ensure that all Inlet & Outlet gas connections to the Promet EExd are made correctly and are leak tight checked.

3. Fully open the flow control valve of the flow meter of each channel.

4. Fully open the sample gas inlet isolation valves.

5. Adjust open the pressure regulators until full scale flow is observed on each of the water dew-point channels.

6. Allow the sample gas to purge the system for the period of time indicated in the table below:

TOTAL PURGE TIME

must be a minimum of 1 minute at 1 Nl/min (2.1 scfh)

Assumes total system pipe length is 3m (9.8’) and internal pipe bore is

the recommended 4mm (0.16”) internal bore.

For every additional 1m (3.3’) of pipe work, continue the Gas Purge for

an additional 15 seconds at 1 Nl/min (2.1 scfh).

7. After the appropriate purge duration, close the gas inlet isolation valve.

8. Ensure the window is replaced and fully secured before applying the power.

Michell Instruments 15

INSTALLATION

Promet EExd User’s Manual

MINIMUM REQUIREMENTS FOR START UP PURGING

PRESSURE

GAS INLET

ISOLATION VALVE

GAS INLET

ISOLATION VALVE

NOTE: CONNECTING PIPEWORK TO BE 4mm I/D BORE, 316L STAINLESS STEEL TUBE

PRESSURE

Figure 7

2.7 Sample Gas Flows

The flow through each channel should be set at approximately 2 Nl/min (4.2 scfh). This flow setting figure is not required to be precise. Its purpose is only to ensure that a representative sample of gas is presented to the measurement sensor.

GAUGE



GAUGE





PRESSURE

REGULATOR



PRESSURE

REGULATOR





WATER DEW-POINT

CHANNEL-1



GAS IN GAS OUT

PROMET EExd



GAS IN GAS OUT

WATER DEW-POINT

CHANNEL-2



FLOWMETER







Minimum Requirements for Start-up Purging

NON-RETURN

VALVE

GAS OUTLET

To increase the speed of response of the measurement of the main process gas it is highly recommended that a fast bypass loop be installed into the gas sampling system. The recommended flow through the bypass loop should be approximately 3 times that of the measurement channel. Therefore, typically, the bypass gas flow should be set to approximately 6 Nl/min (12.7 scfh).

2.8 Sample Flow Alarms (Optional)

The optional flow switches are supplied to alert the user to either severely reduced or discontinuation of the sample gas flow through the system. An alarm state will be indicated on the error message line at the bottom of the MAIN Page. See Section 4.4 on troubleshooting for further details.

When the flow of sample gas is set correctly, the alarm states will be indicated when the gas flows have lowered into a range deemed unsuitable for effective measurements to be made. The flow switches are adjusted during factory test to activate the alarm when the flow falls below approximately 10 to 20% of the normal recommended sample flow setting (see Section 2.7). During the factory setting procedure the gas pressure that is applied represents the most common application analysis conditions for water dewpoint sensors {68 barg (986 psig)}. The operation of these variable area flow switches are influenced by pressure. For increased pressure the flow alarm activation point will be at a higher flow rate and conversely, for reduced pressure, the activation point will be at a lower rate. These devices exhibit a hysteresis that may require a flow of greater than 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. If this is the case, contact Michell Instruments (www.michell.com) for guidance on how adjustments can be made on site.

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3 OPERATION

3.1 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. Figure 9 shows the MAIN Page for both 1 and 2 sensor configurations.

Pressing the MENU/MAIN button from this page will take you to the MAIN MENU Page (see Section 3.4).

MOISTURE

OPERATION

Figure 8

3.2 User Interface

3.2.1 Interface Controls

16.2

Cdp

PRESSURE

0.4

TIME TO NEXT DATA LOG: 7m 45s

barg

CH 1

0.0 0Cdp 0 psig

CH 2

-80.0

Cdp

0 psig

TIME TO NEXT DATA LOG: 7m 45s

MAIN Page in Single Channel (top) and Dual Channel Modes

Promet EExd

Process Moisture Analyzer

MOISTURE

16.2

PRESSURE

0.4

TIME TO NEXT DATA LOG: 7m 45s



Up/Down

Buttons

Figure 9

Arrow

Cdp

barg



SELECT

MAIN





SELECT

MENU/

Button

MAIN

Button

User Interface



VFD Display

Blue LEDs

Figure 10 illustrates the user interface. It has a vacuum fluorescent display and four touch sensitive pads that facilitate user interaction through the glass of the enclosure.

Michell Instruments 17

OPERATION

3.2.2 ‘Up/Down Arrow’ Buttons

Promet EExd User’s Manual

The Up () and Down () buttons are used to change pages, scroll through lists and adjust values.

3.2.3 ‘SELECT’ Button

The SELECT button is used to select or de-select a highlighted item in a menu list.

Figure 10

Figure 11

Up/Down Arrow Buttons

SELECT

‘SELECT’ Button

3.2.4 ‘MENU/MAIN’ Button

The MENU/MAIN button is used to toggle between the MAIN Page and the MAIN MENU Page, or return to the MAIN Page from any location within the menu structure.

Figure 12

MAIN

‘MENU/MAIN’ Button

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3.3 Menu Structure

Figure 14 shows a map of the menu structure.

KEY

Choices

Menu Pages

Other Pages

Main Menu

Status Page



SELECT



Error ?

YES



Error Report

Page

SELECT





SELECT

STATUS

View

Logged

Data

SELECT

LOGGING



View

Statistics

SELECT



Page

SELECT

View

System

Faults

SELECT

Logged

Error Codes



Start-Up

Banner



Main Page

MAIN



VIEW/ADJ

VARIABLES

SELECT



Password

Page



SELECT



Password

Correct?

YES

SENSOR

INFO

SELECT

WDP Sensor

OPERATION

MAIN

Press MENU/MAIN button to

get back to Main Page from

any location

MAIN

CONTACT

INFO

SELECT



Info



Contact/About



Logged Pages

Figure 13



Page

Variables Pages

Menu Structure



Use Up/Down arrow buttons to scroll through menu items and pages

Michell Instruments 19

OPERATION

3.4 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 Up () and Down () buttons to highlight the page of interest and press the SELECT button to access.

Promet EExd User’s Manual

STATUS

LOGGING MENU VIEW/ADJ VARIABLES SENSOR INFO CONTACT INFO

3.5 STATUS Page

This page shows the status of the process alarm and flow for one or both channels, depending upon the configuration. When the measured moisture value rises above the

alarm set-point, the moisture alarm condition will be displayed as ON*ALERT*. No flow is displayed as OFF*ALERT*.

Figure 14

MAIN MENU Page

STATUS PAGE

ALARM CONDITIONS

CHANNEL 1 MOI :ON CHANNEL 1 FLOW :ON

TIME TO NEXT DATA LOG: 2m 11s

Figure 15

STATUS Page

XALERTX

Press the MAIN/MENU button to return to the MAIN Page.

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3.6 LOGGING MENU Page

This page allows the viewing of data or statistical information on the logged data. Press the SELECT button to see the following options:

View Logged Data

View Statistics

View System Faults

Press the Up () and Down () buttons and the SELECT button to enter these options pages.

If there is no data available then No Data Available will be displayed and no access will be given to the other two options.

3.6.1 VIEW LOGGED DATA Page

OPERATION

This page allows access to the previous measurement results made by the instrument. A rolling total of a maximum of 150 samples can be logged, which represents a measurement history of 150 x (measurement time) in minutes. Sample 1 represents the most recent measurement taken. After 150 measurements have been logged, the oldest measurement will be deleted and replaced as each new measurement is logged.

Caution: Changing the moisture value, e.g. from dew point to ppm, will result in the loss of all logged data.

Access to each measurement sample is via the Up () and Down () buttons, which may be used to scroll through each page of information. If faster scrolling is required

(to quickly move to another sample) press the SELECT button and the sample number will increase by 10. When the sample number selected is greater than that acquired, or is greater than 150, Sample 1 will be selected and displayed.

Sample Number Time of Sample

  

Date (day/month)

LOGGED DATA

NO. 1 10:20 29/06

MOI 6.2 oCdp PRES 0.2 barg

Figure 16

Michell Instruments 21

LOGGED DATA Page

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

• The units of measurement

Press the MAIN/MENU button to return to the MAIN Page.

3.6.2 VIEW STATISTICS Page

These pages display the maximum, minimum and average values for each measured parameter for up to 150 previous measurement samples. RESET LOG on the MAIN

MENU Page re-sets the logging statistics.

Promet EExd User’s Manual

for 1 or 2 channels

STATISTICS PAGE 1/2

MOI MAX 0.6

at 08:00 on 02/03

MOI MIN 0.6

at 08:00 on 02/03 MOI AVR 0.6

Figure 17

Use the Up () and Down () buttons to scroll through the statistics.

Press the MAIN/MENU button to return to the MAIN Page.

STATISTICS Page

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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.

LOGGED ERROR CODES

CODE TIME & DATE

0008 11:10 02/08/12

OPERATION

Figure 18

Refer to Section 4.4 for descriptions of the error messages and codes.

Press the MAIN/MENU button to return to the MAIN Page.

3.7 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/ADJ VARIABLES Pages.

The password is: 7316

LOGGED ERROR Page

ENTER PASSWORD

USE ARROW KEYS AND SELECT KEY

0 0 0 0

Figure 19

Use the Up () and Down () buttons to change the highlighted digit and press the

SELECT button to enter and move to the next digit. Inputting 4 correct digits will result

in access to the VARIABLES Pages as detailed in the following sections.

Michell Instruments 23

PASSWORD Page

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 Up (), Down () and SELECT

buttons.

Use the Up () and Down () buttons to scroll through the list and from page to page. To select a variable for adjustment, scroll to the desired variable and press the SELECT button. A small box will appear beside the value to indicate that it can be adjusted. Use the Up () and Down () buttons to change the value. NOTE: Numerical values can be changed at a faster rate by extending the duration of the Up () and

Down () button press.

VARIABLES PAGE 1/3 UNITS apply alarm OP1 MIN

Dew Point n/a 0

-100

OP1 MAX OP2 MIN

0 barg

Promet EExd User’s Manual

Figure 20

3.7.3 Single Channel Configuration VARIABLES Pages

For more information on each variable refer to Appendix B

VARIABLES Page 1

Variable Brief Description

UNITS

apply

alarm

OP1min

OP1max

OP2min

Moisture measurement

Used for calculating dew point at an applied pressure for ideal or natural gas

Moisture value that trips the process alarm

Moisture value that gives 4 mA on mA1 output

Moisture value that gives 20 mA on mA1 output

Dew-point or Pressure value that gives 4 mA on mA2 output

VARIABLES Page

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VARIABLES Page 2

Variable Brief Description

OPERATION

OP2max

°C/°F

Pressure

TIME

DATE

OP2/4 PARAM

VARIABLES Page 3

Variable Brief Description

LOG INT’VAL

RESET LOG

INST ADDR

INT TEMP SP

SET DEFAULT

3.7.4 Dual Channel Configuration VARIABLES Pages

Dew-point or Pressure value that gives 20 mA on mA2 output

Temperature units selection

Pressure units selection

System time

System date

Adjustable range/options: Measured Dew point, Pressure

Time interval between data logs

Clears the logged data

Sets the instrument address

Set-point temperature of the internal heater

Sets the system defaults

For more information on each variable refer to Appendix B

VARIABLES Page 1

Variable Brief Description

CHN1

apply

alarm CHN2

apply

alarm

VARIABLES Page 2

Variable Brief Description

OP1min

OP1max

OP2min

OP2max

OP3min

OP3max

Moisture measurement for Channel 1

Used for calculating dew point at an applied pressure for ideal or natural gas

Moisture value that trips the process alarm for Channel 1

Moisture measurement for Channel 2

Used for calculating dew point at an applied pressure for ideal or natural gas

Moisture value that trips the process alarm for Channel 2

Moisture value that gives 4 mA on mA1 output

Moisture value that gives 20 mA on mA1 output

Dew-point or Pressure value that gives 4 mA on mA2 output

Dew-point or Pressure value that gives 20 mA on mA2 output

Moisture value that gives 4 mA on mA3 output

Moisture value that gives 20 mA on mA3 output

Michell Instruments 25

OPERATION

VARIABLES Page 3

Promet EExd User’s Manual

Variable Brief Description

OP4min

OP4max

°C/°F

Pressure

TIME

DATE

VARIABLES Page 4

Variable Brief Description

OP2/4 PARAM

SET DEFAULT

LOG INT’VAL

RESET LOG

INST ADDR

INT TEMP SP

Dew-point or Pressure value that gives 4 mA on mA4 output

Dew-point or Pressure value that gives 20 mA on mA4 output

Temperature units selection

Pressure units selection

System time

System date

Adjustable range/options: Measured Dew point, Pressure

Set the system defaults

Time interval between data logs

Clears the logged data

Sets the instrument address

Set-point temperature of the internal heater

3.8 SENSOR INFO Page

This page contains the information relating to the water dew-point sensors.

Hours Used Duration that the sensor has been in active use

Next Cal Next recommended calibration date of sensor

Sensor S/N Serial number of sensor

SENSOR INFO

HOURS USED 00006 NEXT CAL 11/2012 SENSOR S/N FD79-0430

Figure 21

SENSOR INFO Page

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3.9 CONTACT INFO Page

This page contains contact information for Michell Instruments.

MICHELL INSTRUMENTS

WEB: WWW.MICHELL-INSTRUMENTS.COM E-MAIL: INFO@MICHELL-INSTRUMENTS.COM

OPERATION

CONTACT INFO

Figure 22

CONTACT INFO Page

Michell Instruments 27

MAINTENANCE

4 MAINTENANCE

Promet EExd User’s Manual

The power to the enclosure must be

turned off before any work is carried out

in the measurement system enclosure.

Observe de-energize durations.

Gas line connections to the measurement

system must be isolated and de-pressurized

before any work commences.

Before powering up the instrument

the “Start-Up Purge Procedure” must

be carried out. See Section 2.6.

To ensure the full requirement of this product’s safety

certificate is maintained, any loosened or disturbed

tubework or couplings must be subject to a gas

pressure test and appropriate leak check at 1.5x the

max operating pressure before the full product is re-

energized.

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. michell.com) or your local representative.

4.1 Enclosure Cover and User Interface

The enclosure cover is part of the flameproof protection for the enclosure and has an IP66 rating. It should be firmly closed to ensure flameproof integrity and continued environmental protection. For prolonged and easy operation ensure that the threads are always lubricated with a light grease. A grub screw is used as a locking device. This should be loosened before unscrewing the cover counter-clockwise.

The user interface assembly uses two ¼ turn bayonet style fasteners to secure it. These are finger operated and should be turned clockwise to lock and counter-clockwise to release. The user interface, once disconnected from the two ¼ turn fasteners, can be temporarily re-positioned on the instrument by securing the right-hand fastener in the left-hand mount. This will situate the interface assembly in an overhanging position outside of the enclosure allowing greater access. If there is insufficient space to accommodate the overhanging user interface assembly on the left-hand side, it may be rotated 180° (upside down) and placed on the right-hand side.

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Promet EExd

Process Moisture Analyzer

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.

All of the procedures below can only be carried out by

first unscrewing the enclosure glass cover and removing

the user interface assembly.

4.2 Replacement of the Moisture Sensor Assembly

The power to the enclosure must be turned off before

any work is carried out in the measurement system

enclosure. Observe de-energize durations.

1. Isolate the incoming sample gas line by CLOSING the sample inlet isolation valve and allow the system to depressurize. Isolate the power and observe the de-energize duration.

2. Remove the enclosure window and mount the user interface (see Section 4.1).

3. Using a 2.5mm hex key remove the M3 cap head screw (1 in Figure 25) securing the water sensor assembly to the stay bracket.

4. Restrain the sensor assembly. Use a 11mm spanner to loosen and remove the 2 off 1/8” water dew-point sensor sample pipe connections (2 in Figure 25).

Michell Instruments 29

MAINTENANCE

Promet EExd User’s Manual







Figure 24

5. Carefully pull the sensor block assembly out of the enclosure. This will allow access to the two sensor connections and the pressure transducer connection.

6. Disconnect the ribbon cable connectors from the sensor pcb.

7. Unscrew the connector from the pressure transducer and fully remove the moisture sensor assembly from the enclosure.

8. Reconnect the sensor and pressure transducer connections to the replacement moisture sensor assembly. Reposition the assembly on the stay bracket and secure with the M3 cap head screw.

9. Refit and fully tighten the 1/8” water dew-point sensor sample pipe connections.

10. To ensure the full requirement of this product’s safety certificate is maintained, any loosened or disturbed tubework or couplings must be subject to a gas pressure test and appropriate leak check at 1.5x the max operating pressure before the full product is re-energized.

Moisture Sensor Assembly Replacement

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4.3 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.

1. Isolate the incoming sample gas line by CLOSING the sample inlet isolation valve and allow the system to depressurize. NOTE: Always

refer to Appendix G.4 - Special Conditions of Safe Use.

2. Remove the enclosure window and mount the user interface as shown in Section 4.1.

3. Restrain the flow switch assembly using an 11mm spanner to loosen and remove the 2 off 1/8” sample pipe connections.

MAINTENANCE

4. Disconnect the 2-wire cable connector from the flow switch to the main circuit board.

5. Carefully pull the flow switch assembly out of the enclosure.

6. Replacement of the flow switch is simply a reversal of the above procedure.

7. To ensure the full requirement of this product’s safety certificate is maintained, any loosened or disturbed tubework or couplings must be subject to a gas pressure test and appropriate leak check at 1.5x the max operating pressure before the full product is re-energized.

Michell Instruments 31

MAINTENANCE

4.4 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.

Promet EExd User’s Manual

MOISTURE

0.5

PRESSURE

NO FLOW

Error Message Description and Possible Cause

oCdp

psig

Figure 25

MOISTURE UNDER RANGE

MOISTURE OVER RANGE

TEMPERATURE ERROR

NO FLOW

PRESSURE TRANSMITTER FAILURE

CAL TABLE ERROR

LBMMSCF OUT OF RANGE

INTERNAL HEATER FAULT

Error Message Line

Sensor tile failure

Temperature sensing device of the moisture sensor has failed

No gas ow through sensor measurement cell see Section 2.7

No pressure detected in the sensor measurement cell

Fault with sensor calibration data

Calculation of moisture in natural gas cannot be calculated due to invalid inputs

Fault with the internal temperature control

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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. For example, if an error code 0004 was logged this would indicate CHANNEL 1

TEMPERATURE ERROR. If an error code of 0000 was next logged this would indicate

that the error had now cleared.

LOGGED ERROR CODES

CODE TIME & DATE

0008 11:10 02/08/12

MAINTENANCE

Figure 26

Logged Error Codes and Error Indication (Modbus Register 35)

Also see Appendix G, Register Configuration C for more details

Error Code Error Message

0000 All previous errors now cleared 0001 Channel 1 moisture sensor under range 0002 Channel 1 moisture sensor over range 0004 Channel 1 temperature device fault 0008 Channel 1 no ow 0010 Channel 1 pressure transmitter failure 0020 Channel 1 LBMMSCF calculation error 0040 Not used 0080 Channel 2 moisture sensor under range 0100 Channel 2 moisture sensor over range 0200 Channel 2 temperature device fault 0400 Channel 2 no ow 0800 Channel 2 pressure transmitter failure 1000 Channel 2 LBMMSCF calculation error 2000 Not used 4000 Internal heater fault

The 4 digit error codes are hexadecimal numbers that are dependent upon the bits set within the error indication register.

Logged Error Codes

Michell Instruments 33

MAINTENANCE

If more than one error has occurred, then the error codes will be added together, e.g.

1) Error Code 0104 = Error Code 0100 (Channel 2 sensor over range) plus Error Code 0004 ( Channel 1 temperature device fault) (0100 + 0004 = 0104)

2) Error Code 0C00 = Error Code 0800 (Channel 2 pressure transmitter fault) plus Error Code 0040 (Channel 2 no flow ) (0800 + 0400 = 0C00)

Note : In hexadecimal

A = 10 B = 11 C = 12 D = 13 E = 14 F = 15

Promet EExd User’s Manual

4.4.3 Analyzer Status Alarm Relay

Each alarm relay features Normally Open (N/O), Normally Closed (N/C) and Common (C) contacts.

The process alarm contacts change state when the moisture value is greater than the alarm set point.

The fault alarm contacts change state when an error associated with the channel occurs, or when there is a supply failure.

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APPENDIX A

Appendix A

Technical Specifications

Michell Instruments 35

APPENDIX A

Appendix A Technical Specications

Main Unit – Measurement Parameters

Channel Conguration Single and dual channel Moisture Parameters Dew point °C and °F / Pressure

Automatic pressure compensated conversions: ppmV for natural gas and ideal gas

Moisture Content

Analysis Pressure barg, MPa and psig

Sensor Technology

Sensor Technology Michell Ceramic Moisture Sensor

Measurement Range

Calibration Range

Accuracy

Measured Resolution

Displayed Resolution

Temperature Coecient Algorithm compensation

lb/MMscf and mg/m3 for natural gas dew point at a pressure input by the user for natural gas & ideal gas Calculations for natural gas moisture content based on either IS0 18453 or IGT#8 to customer order preference

-120 to +30°Cdp (-184 to +86°Fdp) 1 ppbV to 30,000 ppm 0 to 250 barg (0 to 3625 psig)

-100 to +20°Cdp (-148 to +68°Fdp) 10 ppbV to 23,000 ppm

Dew point: ±1°C between –59.9 & +20°Cdp (±1.8°F between -75.9 to +68°Fdp) Moisture content: ±10% of reading Dew point: ±2°C between –60 & -100°Cdp (±3.6°F between -76 to -148°Fdp) Moisture content: ±20% of reading Analysis Pressure: ±0.25% FS

0.1°C: -80 to +20°Cdp (0.2°F: -112 to +68°Fdp) 1°C: -100 to -80°Cdp (2°F: -148 to -112°Fdp)

Dew point: 0.1°C (0.2°F) Moisture content: autoscale, 5 digits MPa and barg: 0.1 (1 psig)

Promet EExd User’s Manual

HMI

Keyboard/Interface Capacitive touch-screen through glass Display Vacuum uorescent

A rolling maximum of 150 data logs is available Each log records time, date, moisture and pressure values for each

Datalogging

Communications and Output

channel 5 minutes minimum and 60 minutes maximum logging intervals can be set by the user

Two non-isolated 4-20 per measurement channel 500 Ω maximum load Range and parameter settable by user Modbus RTU @ 9600 baud-rate Alarms: two volt free contacts per channel; one process value and one instrument status Also available via Modbus communications

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APPENDIX A

Enclosure

Main Unit Enclosure

Type Flameproof EExd Construction Cast copper-free aluminum Finish Chromate primer, Polyester P9010 powder coated (black) Meets BS3900

Internal temperature control for condensation protection and stable analysis conditions

General

Operating Pressure Max. 138 barg (2000 psig) Sample Connections 1/8” NPT(F) Sample Flow Rate 0.5 to 5 Nl/min (1.06 to 10.6 scfh) Sample Flow Alarm Optional Power Supply 90 to 260 V AC, 47/63 Hz, 180 W - Main Unit

353 x 310 x 245mm (13.8 x 12.2 x 9.6”) (h x w x d)

Dimensions

Weight Analyzer - 21kg (46lbs)

Operating Environment

500 x 500 x 245mm (19.7 x 19.7 x 9.6”) (including installation clearance) (h x w x d)

Indoor/Outdoor -20 to +60°C (-4 to +140°F) Max 95%RH Shaded location IP66/NEMA4

Hazardous Area Certification

ATEX

II2G Exd IIB + H2 Gb T5 (Tamb -40°C to +44°C) T4 (Tamb -40°C to +60°C)

IECEX

Exd IIB + H2 Gb T5 (Tamb -40°C to +44°C) T4 (Tamb -40°C to +60°C)

Certication Codes

Pattern Approvals GOST-R, GOST-K

cCSAus

Class I, Division 1, Groups B, C & D T5 (Tamb -40°C to +44°C) T4 (Tamb -40°C to +60°C)

TR CU 012

1Exd IIB + H2 Gb T5 (Tamb -40°C to +44°C) T4 (Tamb -40°C to +60°C)

Michell Instruments 37

APPENDIX A

270mm 10.63"

318mm 12.52"

355mm [13.9"]

245mm 9.65"

290mm [11.41"]

4 o M12 (1/2") Clearance

Enclosure Breather Flame Arrestor Do NOT obscure

Sample Out - Channel 2 (Optional) Flame Arrestor 1/8" NPT Female (ATEX/IECEx/CSA)

Sample In - Channel 2 (Optional) Flame Arrestor 1/8" NPT Female (ATEX/IECEx/CSA)

Sample in - Channel 1

Flame Arrestor

1/8" NPT Female (ATEX/IECEx/CSA)

Sample out - Channel 1

Flame Arrestor

1/8" NPT Female (ATEX/IECEx/CSA)

310mm [12.20"]

Cable Entry Glands 3 o M20 (ATEX) 3 o 1/2" NPT (CSA)

A.1 Mounting Drawing

Promet EExd User’s Manual

Figure 27

Mounting Drawing

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A.2 Pipework Connections

PRESSURE

TRANSMITTER



APPENDIX A



CHANNEL 1 CHANNEL 2

MICHELL MOISTURE

SENSOR

PRESSURE

TRANSMITTER

MICHELL MOISTURE

SENSOR

GAS SAMPLING BLOCK

FLOW

SWITCH

(optional)

FLAME



ARRESTORS

GAS IN GAS OUT



FLAME

BREATHER

ARRESTOR



GAS SAMPLING BLOCK

FLOW

SWITCH

(optional)



FLAME

ARRESTORS

GAS IN GAS OUT

Figure 28

Pipework Connections

Michell Instruments 39

APPENDIX A

A.3 System Wiring Diagram

AL3AL2AL1 AL4 COMMS Channel 1 Channel 2

NC C NO NC C NO

1 2 3 4 5 6

NC C NO NC C NO

7 8 9 1011

PL16

Promet EExd User’s Manual

mA1+

mA1-

mA2+

B A GND

PL20 PL15 PL14 PL19

13 14 15

16 17 18 19 20 21 22 23

L E N

mA2-

mA3+

mA3-

mA4+

mA4-

Enclosure wall



Gland

Cable screen

Figure 29

System Wiring Diagram

EExd Stopping Glands MUST be used for ATEX/IECEx

installations.

Refer to the separate installation & maintenance information

sheet supplied.

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APPENDIX B

Appendix B

Variable Definitions

Michell Instruments 41

APPENDIX B

Appendix B Variable Denitions

From the VARIABLES page, press the Up () or Down () buttons to highlight the variable required. Press the SELECT button to enter the range/options area. Change the variable using the Up () or Down () buttons and press the SELECT button to set

the new option. Scroll down to the next variable required. To return to the MAIN Page press the MENU/MAIN button.

Variable: UNITS (single channel), CHN1, CHN2 Adjustable Range/Options: Ppm(v) IG, DP@PR idl Gas, DP@PR Nat Gas, mgm-3

Gas, Ppm(v) NG, LBMMSCF, Dew point

Description: The moisture units for Channels 1 and 2.

i. Dew point can be displayed in either °C or °F whether it is at

the sample pressure or if it is calculated to another.

ii. When calculating the dew point at another pressure (DP @

PR) the apply option below is enabled to allow the entry of

the pressure at which the dew point is to be calculated at.

Promet EExd User’s Manual

Nat

iii. mA1 and mA3 outputs represent the setting of Channel 1

and 2 respectively.

NOTE: Changing the units clears the data logging memory and resets the

analog outputs and alarm settings.

Variable: apply Adjustable Range/Options: Pressure value in the units of pressure

Description: The pressure value entered here is the pressure value at which dew point

will be calculated at, if DP@PR Nat Gas or DP@PR IDL Gas is selected as the unit of moisture measurement. If any other unit is selected then the

option will show n/a.

Variable: alarm Adjustable Range/Options: -100 to +100°C, 0 to 1200 LBMMSCF, 0.0 to 3000.0

Ppm(v), 0 to 1000mgm-3

Description: The set point for the process alarm that activates the channel alarm relay

when the moisture value exceeds it.

Variable: OP1MIN (single channel), OP3MIN Adjustable Range/Options: -100 to +100°C, 0 to 1200 LBMMSCF, 0.0 to 3000.0

Ppm(v), 0 to 1000mgm-3

Description: The minimum moisture value that 4 mA represents for the respective

output.

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Variable: OP2MIN (single channel), OP4MIN Adjustable Range/Options: 0.1 - 25.0 MPa/0 - 250 barg/0 - 3000 psig (for Pressure)

-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.

Variable: OP1MAX (single channel), OP3MAX Adjustable Range/Options: -100 to +100°C, 0 to 1200 LBMMSCF, 0.0 to 3000.0

Description: The maximum moisture value that 20 mA represents for the respective

output.

Ppm(v), 0 to 1000mgm-3

APPENDIX B

Variable: OP2MAX (single channel), OP4MAX Adjustable Range/Options: 0.1 - 25.0 MPa/0 - 250 barg/0 - 3000 psig (for Pressure)

-100 to +100°C/-148 to +212°F (for Dew point)

Description: The maximum dew-point or pressure value that 20 mA represents for the

respective output.

Variable: °C / °F Adjustable Range/Options: Celsius or Fahrenheit

Description: Dew-point unit of measurement, in °C or °F.

NOTE: Changing the temperature units will set the default values and

clear the logged data.

Variable: Pressure Adjustable Range/Options: MPa, barg, psig

Description: Units of measurement for the pressure values. psig, barg or MPa may be

selected.

NOTE: Changing the pressure units will clear the logged data.

Michell Instruments 43

APPENDIX B

Variable: TIME Adjustable Range/Options: hh:mm; 00:00 to 23:59

Description: The real-time clock in 24hr format. Minutes and hours may be adjusted.

Variable: DATE Adjustable Range/Options: Day: 01-31, Month: 01-12, Year: 00-99

Description: The date. Format: ddmmyy. To adjust the day, highlight the DATE field,

Promet EExd User’s Manual

Pressing either the Up () or Down () buttons will increment or decrement the minute’s field and the corresponding hours field will change automatically.

press SELECT (a ‘d’ should appear to the right of the year value). Use the

Up () or Down () buttons to adjust. To adjust the month and year,

press SELECT again (an ‘m’ should appear to the right of the year value). Use the Up () or Down () buttons to adjust the month. As the month changes, the year field will change automatically. Press SELECT to finish.

Variable: OP2/4 PARAM Adjustable Range/Options: Measured Dew point, Pressure

Description: The parameter selected for mA2 (and mA4) outputs.

Variable: LOG INT’VAL Adjustable Range/Options: 10 to 60 in intervals of 10 minutes

Description: Sets the interval between the logged data readings.

Variable: RESET LOG Adjustable Range/Options: select, done

Description: Resets the logging statistics so that the variation in measurements can be

recorded from a user-defined start point. When the RESET LOG variable is highlighted press the SELECT button - the option will go from select to

done.

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Variable: INST ADDR Adjustable Range/Options: 01 to 31

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

Description: Sets the set point for the internal heater.

Variable: SET DEFAULT Adjustable Range/Options: select, done

APPENDIX B

Description: Sets instrument to default configuration. The default values for all the

variables and parameters are set.

The default values are:

Units/CHN1/2

apply

alarm

OP1 Min

OP1 Max

OP2 Min

OP2 Max

OP3 Min

OP3 Max

OP4 Min

OP4 Max

°C/°F

Pressure

LOG INT

INST ADD

INT TEMP SP

Dew point

N/A

0°C

-100°C

+20°C

0 barg

250 barg

-100°C

+20°C

0 barg

250 barg

Celcius

barg

10mins

+20°C

Michell Instruments 45

APPENDIX C

Promet EExd User’s Manual

Appendix C

Software

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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.

The Promet EExd application software provides the user with advanced acquisition, logging and charting features for full remote control and monitoring of the Promet EExd.

With this application software it is possible to:

• View all main parameters of interest

• Modify parameters

• Record parameters to a virtual chart recorder

• Record parameters to a file

APPENDIX C

• Acquire data from up to 31 process instruments

• Perform remote diagnostics

• Acquire OPC enabled remote access to all parameters and

variables

C.1 System Requirements

For a desktop computer, the following specification applies:

• Microsoft Windows 7, 98SE, ME, 2000 or XP operating system

• Spare RS232 port (normally labelled COM1, COM2 etc)

• Minimum of 64 MB of RAM (128M or higher recommended)

• Minimum of 200 MB of free hard disk space (application

approximately 3.5 MB, spare for log files)

• Intel Pentium II class processor, 200 MHz or higher

Michell Instruments 47

APPENDIX D

Promet EExd User’s Manual

Appendix D

Modbus RTU

Communications

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Device Address

Function Code

Data Bytes

CRC

Device Address

Function Code

Data Bytes

CRC

Query Message from Master Response From Slave

MASTER

SLAVE

Appendix D Modbus RTU Communications

D.1 Introduction

Implemented within the Promet EExd are Modbus RTU communications that enable remote access to the instrument’s configuration and data logging facilities. This protocol offers two-way communication between a PC or PLC known as the master, to one or more instruments known as slaves. Communication is achieved by the master reading or writing to registers within the slave. The slave acts upon information contained within the registers that can be written, and the master obtains measured values and status information from the register that can be read. Appendix E lists these registers and Appendix G specifies the number or data formats that apply to each register.

D.2 Modbus RTU Basics

Modbus RTU operates on a Query-Response Cycle (see the diagram below). The function code in the query tells the addressed slave device which actions to perform using the information contained in the data bytes. The error check field provides a method for the slave to validate the integrity of the message contents.

APPENDIX D

If the slave makes a normal response, the function code in the response is an echo of the function code in the query and the data bytes will contain data collected by the slave, such as register values or status information. If an error occurs, the function code is incremented by 80H. This indicates that the response is an error response, known as an exception, and the data bytes contain a code to describe the error. The error check field allows the master to confirm that the message contents are valid.

D.3 Physical Layer

Michell Instruments 49

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:

Baud Rate: 9600 Start Bit: 1 Data bits: 8 Parity: None Stop bit: 2

APPENDIX D

D.4 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.

D.5 Register Map

The following tables describe the instrument registers with their address location, Modbus function and the number format.

System Parameters

Promet EExd User’s Manual

Address

dec

0 0000* Instrument Address R/W 0001H F

1 0001 Sensor 1 Moisture Value – Hi Word R L

2 0002 Sensor 1 Moisture Value – Lo Word R L

3 0003 Sensor 1 Ambient Temperature R H

4 0004 Status R D

5 0005 Sensor 2 Moisture Value – Hi Word R L

6 0006 Sensor 2 Moisture Value – Lo Word R L

7 0007 Time to next log Mins + Secs R I

8 0008 Sensor 2 Ambient Temperature R H

9 0009 Sensor 1 Pressure value R H

10 000A Sensor 2 Pressure value R H

11 000B Sensor 1 Moisture Setting R/W 0001H B

12 000C* mA1 output maximum value (sensor 1 moisture) R/W 0032H K

13 000D* mA1 output minimum value (sensor 1 moisture) R/W FFCEH K

14 000E* mA2 output maximum value (sensor 1 pressure) R/W 0BB8H M

15 000F* mA2 output minimum value (sensor 1 pressure) R/W 0000H M

16 0010* Sensor 2 Moisture Setting R/W 0001H B

17 0011* mA3 output maximum value (sensor 2 moisture) R/W 0032H F

18 0012* mA3 output minimum value (sensor 2 moisture) R/W FFCEH K

19 0013* Logging Interval R/W 000AH I

20 0014* mA4 output maximum value (sensor 2 pressure) R/W 0BB8H M

21 0015* mA4 output minimum value (sensor 2 pressure) R/W 0000H M

22 0016* Sensor 1 Alarm Set Point R/W 0000H K

23 0017* Sensor 2 Alarm Set Point R/W 0000H K

24 0018* RTC Year (val1) + Month (val2) R/W I

25 0019* RTC Date (val1) + Hours (val2) R/W I

26 001A* RTC Mins (val1) + Secs (val2) R/W I

27 001B* Sensor 1 Pressure Set (DP @ Pressure) R/W H

28 001C* Sensor 2 Pressure Set (DP @ Pressure) R/W H

29 001D Units/ Command R/W 000000H E

30 001E Moisture Sensor 1 – Batch Number R I

31 001F Moisture Sensor 1 – Serial Number R I

32 0020 Moisture Sensor 1 - Year R I

33 0021 Moisture Sensor 1 – Month and day R I

34 0022 Moisture Sensor 1– Hours Of Operation R F

Address

hex

Function

Read/

Write

Default

Value

Cong-

uration

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Promet EExd User’s Manual

APPENDIX D

Address

dec

35 0023 Error Indicator R C

36 0024 Not Used

37 0025 Internal Temperature R A

38 0026 Internal Temp Set Point R/W 07D0H A

39 0027 Moisture Sensor 2 – Batch Number R I

40 0028 Moisture Sensor 2 – Serial Number R I

41 0029 Moisture Sensor 2 - Year R I

42 002A Moisture Sensor 2 – Month and day R I

43 002B Moisture Sensor 2 – Hours Of Operation R F

44 002C Not Used

45 002D Moisture max – Hi Word – Sensor 1 R L

46 002E Moisture max – Lo Word – Sensor 1 R L

47 002F Occurred @ day (val1) + month (val2) R J

48 0030 Occurred @ hour (val1) + min (val2) R J

49 0031 Moisture min – Hi Word – Sensor 1 R L

50 0032 Moisture min – Lo Word – Sensor 1 R L

51 0033 Occurred @ day (val1) + month (val2) R J

52 0034 Occurred @ hour (val1) + min (val2) R J

53 0035 Moisture average Hi Word – Sensor 1 R L

54 0036 Moisture average Lo Word – Sensor 1 R L

55 0037 Sensor 1 Measured dew point - Hi Word R L

56 0038 Sensor 1 Measured dew point - Lo Word R L

57 0039 Instrument Type R 0002H I

58 003A Firmware Version Number R I

59 003B Sensor 2 Measured dew point - Hi Word R L

60 003C Sensor 2 Measured dew point - Lo Word R L

61 003D Moisture max – Hi Word – Sensor 2 R L

62 003E Moisture max – Lo Word – Sensor 2 R L

63 003F Occurred @ day (val1) + month (val2) R J

64 0040 Occurred @ hour (val1) + min (val2) R J

65 0041 Moisture min – Hi Word – Sensor 2 R L

66 0042 Moisture min – Lo Word – Sensor 2 R L

67 0043 Occurred @ day (val1) + month (val2) R J

68 0044 Occurred @ hour (val1) + min (val2) R J

69 0045 Moisture average Hi Word – Sensor 2 R L

70 0046 Moisture average Lo Word – Sensor 2 R L

71 0047 Not Used

72 0048 Not Used

73 0049 Pressure max – Sensor 1 R H

74 004A Occurred @ day (val1) + month (val2) R J

75 004B Occurred @ hour (val1) + min (val2) R J

76 004C Pressure min – Sensor 1 R H

77 004D Occurred @ day (val1) + month (val2) R J

78 004E Occurred @ hour (val1) + min (val2) R J

79 004F Pressure average – Sensor 1 R H

80 0050 Pressure max – Sensor 2 R H

Address

hex

Function

Read/

Write

Default

Value

Cong-

uration

Michell Instruments 51

APPENDIX D

Promet EExd User’s Manual

Address

dec

81 0051 Occurred @ day (val1) + month (val2) R J

82 0052 Occurred @ hour (val1) + min (val2) R J

83 0052 Pressure min – Sensor 2 R H

84 0053 Occurred @ day (val1) + month (val2) R J

85 0054 Occurred @ hour (val1) + min (val2) R J

86 0055 Pressure average – Sensor 2 R H

87 0056 Not Used

88 0057 Not Used

Address

hex

Function

Read/

Write

Default

Value

Cong-

uration

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256 0100 Date Day + Month @ t 0 R J

257 0101 Time Hours + Mins @ t 0 R J

258 0102 Moisture 1 Hi Word @ t 0 R L

259 0103 Moisture 1 Lo Word Pressure @ t 0 R L

260 0104 Pressure 1 @ t 0 R H

261 0105 Moisture 2 Hi Word @ t 0 R L

262 0106 Moisture 2 Lo Word Pressure @ t 0 R L

263 0107 Pressure 2 @ t 0 R H

264 0108 Date Day + Month @ t 0 R J

265 0109 Time Hours + Mins @ t 0 R J

266 010A Moisture 1 Hi Word @ t 0 R L

267 010B Moisture 1 Lo Word Pressure @ t 0 R L

268 010C Pressure 1 @ t 0 R H

269 010D Moisture 2 Hi Word @ t 0 R L

270 010E Moisture 2 Lo Word Pressure @ t 0 R L

271 010F Pressure 2 @ t 0 R H

APPENDIX D

Data Logging

     

1449 05A9 Date Day + Month @ t 0 R J

1450 05AA Time Hours + Mins @ t 0 R J

1431 05AB Moisture 1 Hi Word @ t 0 R L

1452 05AC Moisture 1 Lo Word Pressure @ t 0 R L

1453 05AD Pressure 1 @ t 0 R H

1451 05AE Moisture 2 Hi Word @ t 0 R L

1455 05AF Moisture 2 Lo Word Pressure @ t 0 R L

1456 05B0 Pressure 2 @ t 0 R H

Note: To download logged data, calculate the start address by the following formula: (sample number x 8) + 256. Start addresses that do not coincide with the first register of a sample will generate an exception response. Due to the maximum limit of 125 data registers that can be read in one transmission, as defined by the Modbus RTU standard, only 20 samples can be downloaded at any one time. Therefore, eight reads are required to download all 150 samples.

Michell Instruments 53

APPENDIX E

Promet EExd User’s Manual

Appendix E

Modbus RTU Details

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Appendix E Modbus RTU Details

E.1 Message Framing

APPENDIX E

START ADDRESS

3.5t 1 byte 1 byte n x bytes 2 bytes 3.5t

FUNCTION

CODE

DATA CRC END

Start and End

The message begins and ends with a silent delay of 3.5 character times at the baud rate of the network.

Address

The first byte transmitted is the address of the instrument, which has a range of 1 to 247 or 01H to F7H. The master addresses an instrument by placing the address in the address byte and, if matched, a Promet EExd will response to the message, otherwise it will be ignored. 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) or

06 (Write To Single Register) as these are the only two implemented.

An exception can occur if the message contains an unsupported function code, an illegal data address or an illegal data value. If this occurs, the function code is incremented by 80H and the data bytes returned are set to a value that describes the error. See Appendix F.2.

Data Bytes

The data bytes within the message from the master contain additional information that the Promet 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.

CRC

The CRC is a 2-byte error check value from the result of a Cyclical Redundancy Check calculation performed on the message contents. The CRC is appended to the message as the last field in the message, whereby the low-order byte is appended first, followed by the high-order byte.

Michell Instruments 55

APPENDIX E

ENTRY

Address in message = Instrument Address

Function code supported

Exception Code = 01

0x0000 <= Quantity of Registers <= 0X007d

Exception Code = 03

Exception Code = 02

Starting Address = OK

AND

Starting Address + Number of Registers = OK

Request Processing

Reading Registers = OK

Exception Code = 04

Sends Response with data

Sends Exception Response

EXIT

E.2 Implemented Functions

03 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. Figure 32 shows the state diagram of how the message is processed with the exceptions that may be raised.

Promet EExd User’s Manual

56 97090 Issue 16, April 2019

Figure 30

Reading Holding Registers State Diagram

Promet EExd User’s Manual

The table below is an example of a message sent by the master, to read the time to the next log (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. Bytes 3 & 4 hold the starting address and bytes 5 & 6 hold the number of registers to be read. Bytes 7 & 8 contain the CRC code that is calculated using bytes 1 to 6 as represented below.

Byte No Meaning Value

1 Slave Address 01H 2 MODBUS function code 03H 3 Starting Address MSB 00H 4 Starting Address LSB 07H 5 No of points MSB 00H 6 No of points LSB 02H 7 CRC Lo Byte ??H 8 CRC Hi Byte ??H

APPENDIX E

Read Request Message

In response to the above message, the Promet EExd may transmit the following message.

Byte No Meaning Value

1 Slave Address 01H 2 MODBUS function code 03H 3 Byte Count 04H 4 Data MSB 05H 5 Data LSB 26H 6 Data MSB 00H 7 Data LSB FAH 8 CRC Lo Byte ??H 9 CRC Hi Byte ??H

Read Response Message

This response repeats the address of the Promet EExd and the function code, along with the byte count, the data and the CRC. In this example, the request asked for the values from two registers. Therefore, the number of bytes returned is four. The value of register 7 is contained in bytes 4 & 5 and the value of register 8 in bytes 6 & 7. Register 7 = 5m 26s and register 7 = 00FA = 252 = 25.2°C in this example. Any errors within the data of Read Request Message will result in an exception being raised.

Michell Instruments 57

APPENDIX E

06 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.

Promet EExd User’s Manual

ENTRY

Address in message = Instrument Address

Function code supported

Exception Code = 01

Exception Code = 03

0x0000 <= Register Value<= 0xFFFF

Exception Code = 02

Request Processing

Write To Single Register = OK

Exception Code = 04

Mirrors Request

Sends Exception Response EXIT

Figure 31

Write Single Register State Diagram

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The table below shows the data bytes in a Write To Single Register message. Bytes 1 to 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.

Byte No Meaning Value

1 Slave Address 01H 2 MODBUS function code 06H 3 Starting Address MSB 00H 4 Starting Address LSB 15H 5 Data MSB FCH 6 Data LSB 18H 7 CRC Lo Byte ??H 8 CRC Hi Byte ??H

APPENDIX E

Write Single Register Request and Response

The normal response from the Promet EExd is to re-transmit the received message. However, if the data within the message is incorrect then an exception response will be transmitted.

Michell Instruments 59

APPENDIX E

E.3 Exceptions

A message request from the master will raise an exception response from the slave (Promet EExd) if:

i. the function code is unsupported

ii. the register quantity > 127 (0x007D)

iii. the register address is invalid

iv. the register address + the quantity of register is invalid

v. an error occurred while performing the function

The exception response will contain the function code incremented by 80H and the exception code.

The table below lists the codes supported, along with an explanation of each code.

Promet EExd User’s Manual

Code Name Meaning

01 ILLEGAL FUNCTION

02 ILLEGAL DATA ADDRESS

03 ILLEGAL DATA VALUE

04 SLAVE DEVICE FAILURE

Example of an Exception Response that reads a discrete inputs message generating an illegal function exception.

Byte Meaning Value

1 Slave Address 01H 2 Function 82H 3 Exception Code 01H 4 CRC ??

The function code received in the query is not an allowable action for the slave

The data address received in the query is not allowable. More specically, the combination of starting address and number of registers is invalid for the slave

A value contained in the query data eld is not an allowable value for the slave

An unrecoverable error occurred while the slave was attempting to perform the requested action

The example above shows the function code (02H) sent in the request has been incremented by 80H with the exception code 01H included as the data within the message.

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APPENDIX F

Appendix F

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APPENDIX F

Appendix F Register Number Formats

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

r r r r r r r r r r r r r r r r



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.

Value

Promet EExd User’s Manual



15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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

N/A

lb/MMscf

for Natural Gas

Ppm(v) for Ideal Gas

Dp @ Pressure for Ideal Gas

The bit settings are mutually exclusive.

Dp @ Pressure for Natural Gas

m/gm

Ppm(v) for Natural Gas

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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

r r r r r r r r r r r r r r r r

Bit HEX Error Condition

0 0001 Sensor 1 under range 1 0002 Sensor 1 over range 2 0004 Sensor 1 temperature fault 3 0008 Sensor 1 No ow 4 0010 Sensor 1 pressure transmitter failure 5 0020 Sensor 1 LBMMSCF calculation error 6 0040 NOT USED 7 0080 Sensor 2 under range 8 0100 Sensor 2 over range

9 0200 Sensor 2 temperature fault 10 0400 Sensor 2 No ow 11 0800 Sensor 2 pressure transmitter failure 12 1000 Sensor 2 LBMMSCF calculation error 13 2000 NOT USED 14 4000 Internal heater fault

APPENDIX F

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

r r r r r r r r r r

N/A

1 = ON or Fitted 0 = OFF or Not Fitted

N/A

Process Alarm 2

Flow Channel 2

Process Alarm 1

N/A

Flow Channel 1

Sensor 1 Fitted

Sensor 2 Fitted

N/A

Michell Instruments 63

APPENDIX F

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

N/A

Promet EExd User’s Manual

w w w r/w r/w r/w r/w

N/A

MPa

Reset Logging

Reset Defaults

IGT/ ISO 0 = IGT

Psig/barg 0 = psig

1 = ON / Fitted / Initiate 0 = OFF or Not Fitted

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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. Range = 0 to 65535

°C/°F 0 = °C

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

r r r r r r r r r r r r r r r r



Sign bit = 1 for –ve values (signed int) 7FFF = 3276.7 8000 = -3276.8

The value in bits (15 to 0) + 1 is divided by 10 to give 0.1 resolution for dew-point and temperature values.

Value



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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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 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.

Values for Cycle Time and Max Cool Time are in units of 5 mins.

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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



Day or Hours





APPENDIX F

Val 2

Minutes or Month



Values in HEX i.e. 17th March = 1103H

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

r r r r r r r r r r r r r r r r



Value

Sign bit = 1 for –ve values (signed int) 7FFF = 32767 8000 = -32768



The humidity values for sensors 1 & 2 are represented in IEEE-754 single precision floating point format, in order to cater for the wide range in the value of ppmV. This format is ‘Big Ended’ which means that the High byte is at a lower address in memory than the Lo byte, and is represented as such in the register memory map. The IEEE-754 format is shown below.

Bit 31

Sign bit

0 = +

1 = -

Bits 30 to 23

Exponent Field

Has a +127 bias value

Bits 22 to 0

mantissa

Decimal representation of binary

Where 1.0 ≤ value < 2.0

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APPENDIX F

Examples of floating point to HEX are shown below.

1) +10.3

sign bit = 0

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.

As the exponent is = 3 then the mantissa becomes = 1010.0100 1100 1100 1100 1 101, therefore:-

1010 = (1x23) + (0x22) + (1x21 ) + (0x20) = 10 and

0100 1100 1100 1100 1101 = (0x2-1) + (1x2-2) + -- + (1x2

Therefore the word value = 0100 0001 0010 0100 1100 1100 1100 1101 = 4124CCCD

Promet EExd User’s Manual

-20

) = 0.3

Consequently, for sensor 1 register 0001 = 4124 and register 0002 = CCCD

2) - 0.0000045

sign bit = l

Exponent = -18, therefore exponent field = 127 + (-18) = 109, and bits 30 to 23 = 01101101 Mantissa = 1.179648 which in binary representation = 1 .00101101111111010110101

i.e. (1x2

-18

) + (1x2

-21

) + (1x2

-23

) etc = 0.0000045

Therefore the word value = 1011 0110 1001 0110 1111 1110 1011 0101 = B696FEB5

Consequently, for sensor 1 register 0001 = B696 and register 0002 = FEB5

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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 / 10 Range = 0 to 6553.5

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APPENDIX G

Appendix G

Hazardous Area

Certification

Michell Instruments 67

APPENDIX G

Appendix G Hazardous Area Certication

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 Materials Technology LTD (Notified Body 0891).

The Promet EExd is certified compliant to North American Standards (USA and Canada) for use within Class I, Division 1, Groups B (USA only), C and D Hazardous Locations and has been assessed so by CSA.

G.1 Product Standards

This product conforms to the Standards:

EN60079-0:2012/A11:2013 IEC60079-0:2011 EN60079-1:2007 IEC60079-1:2007 CSA C22.2 No. 142-M1987 UL508 C22.2 No. 30-M1986 UL1203

Promet EExd User’s Manual

G.2 Product Certification

This product is attributed with the product certification codes:

ATEX II2G Exd IIB + H2 Gb T5 (Tamb -40°C to +44°C) T4 (Tamb -40°C to +60°C)

IECEX Exd IIB + H2 Gb T5 (Tamb -40°C to +44°C) T4 (Tamb -40°C to +60°C)

cCSAus Class I, Division 1, Groups B, C & D T5 (Tamb -40°C to +44°C) T4 (Tamb -40°C to +60°C)

G.3 Global Certificates/Approvals

ATEX TRAC11ATEX21320X IECEx TRC11.0011X cCSAus 1701657

These certificates can be viewed or downloaded from our website at: http://www.michell.com

Special attention should be paid to the

for Safe Use

and the

certificates shown on the website.

Conditions of Certification

Special Conditions

listed in the

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G.4 Special Conditions of Use

1. Do not open when an explosive gas atmosphere may be present.

2. External cables shall be compatible with a temperature of 93°C (T5) or 109°C (T4).

3. Maximum process pressure shall not exceed 138 barg.

4. Maximum combined process flow into the enclosure shall not exceed 1.5 LPM.

5. All process lines shall be purged to ensure the process gas or liquid is above its upper explosive limit before applying power.

6. Where painted or powder coated, the enclosures could present an electrostatic hazard. Clean only with a damp or anti-static cloth.

7. The enclosure is to be earthed externally using the earth point provided.

8. Only suitably ATEX / IECEx certified (as appropriate) cable glands and blanking elements shall be used.

APPENDIX G

Refer to the relevant sections within this manual for the connection, wiring and cable glanding requirements.

G.5 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’ Service Center.

Flame paths are not intended to be repaired.

Michell Instruments 69

APPENDIX H

Promet EExd User’s Manual

Appendix H

Pressure Equipment Directive

Compliance Statement

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APPENDIX H

Appendix H Pressure Equipment Directive Compliance Statement

The Pressure Equipment Directive 97/23/EC has been implemented in United Kingdom Law by the Pressure Equipment Regulations 1999.

The regulations require that all pressure equipment and assemblies within scope must be safe when placed on the market or put into service.

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 71

APPENDIX I

Promet EExd User’s Manual

Appendix I

Quality, Recycling

& Warranty

Information

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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:

• ATEX Directive

• Calibration Facilities

• Conflict Minerals

• FCC Statement

• Manufacturing Quality

• Modern Slavery Statement

APPENDIX I

• Pressure Equipment Directive

• REACH

• RoHS2

• WEEE2

• Recycling Policy

• Warranty and Returns

This information is also available in PDF format.

Michell Instruments 73

APPENDIX J

Promet EExd User’s Manual

Appendix J

Return Document &

Decontamination Declaration

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Appendix J Return Document & Decontamination Declaration

Decontamination Certicate

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.

Instrument Serial Number

Warranty Repair? YES NO Original PO #

Company Name Contact Name

Address

Telephone # E-mail address

Reason for Return /Description of Fault:

APPENDIX J

Has this equipment been exposed (internally or externally) to any of the following? Please circle (YES/NO) as applicable and provide details below

Biohazards YES NO

Biological agents YES NO

Hazardous chemicals YES NO

Radioactive substances YES NO

Other hazards YES NO

Please provide details of any hazardous materials used with this equipment as indicated above (use continuation sheet if necessary)

Your method of cleaning/decontamination

Has the equipment been cleaned and decontaminated? YES 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, ammable or toxic gases a simple purge with dry gas (dew point <-30°C) over 24 hours should be sufcient to decontaminate the unit prior to return.

Work will not be carried out on any unit that does not have a completed decontamination declaration.

Decontamination Declaration

I declare that the information above is true and complete to the best of my knowledge, and it is safe for Michell personnel to service or repair the returned instrument.

Name (Print) Position

Signature Date

F0121, Issue 2, December 2011

Michell Instruments 75

http://www.michell.com

Michell Instruments Promet EExd Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual