Michell Instruments Easidew User Manual

Easidew

Dew-Point Transmitter

User’s Manual

97504 Issue 2

May 2018

Please ﬁ ll out the form(s) below for each instrument that has been purchased.

Use this information when contacting Michell Instruments for service purposes.

Transmitter

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

Transmitter

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

Transmitter

Code

Serial Number

Invoice Date

Location of Instrument

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This document is the property of Michell Instruments Ltd. and may not be copied or

otherwise reproduced, communicated in any way to third parties, nor stored in any Data

Processing System without the express written authorization of Michell Instruments Ltd.

For Michell Instruments' contact information please go to

www.michell.com

Easidew

Easidew Transmitter User’s Manual

iv 97504 Issue 2, May 2018

Contents

Safety .......................................................................................................................................v

Electrical Safety .................................................................................................................. v

Pressure Safety .................................................................................................................. v

Toxic Materials .................................................................................................................... v

Repair and Maintenance ...................................................................................................... v

Calibration .......................................................................................................................... v

Safety Conformity ............................................................................................................... v

Abbreviations ............................................................................................................................ vi

Warnings .................................................................................................................................. vi

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

2 INSTALLATION ............................................................................................................. 2

2.1 Unpacking the Instrument .........................................................................................2

2.2 Preparation of the Sensor Cable ................................................................................. 3

2.3 Cable Connection ...................................................................................................... 4

2.4 Electrical Schematic ..................................................................................................5

2.4.1 Electrical Boundaries ........................................................................................... 6

2.4.2 Digital Communication (M12 Version only) ............................................................ 6

2.5 Transmitter Installation ............................................................................................. 6

2.5.1 Sampling Considerations ...................................................................................... 6

2.5.2 Sampling Hints ................................................................................................... 8

2.5.3 Transmitter Mounting ........................................................................................ 11

2.5.3.1 5/8” 18 UNF Version ................................................................................... 11

2.5.3.2 3/4” - 16 UNF Version ................................................................................. 12

2.5.3.3 G1/2" BSPP Version .................................................................................... 12

2.5.3.4 Installation using Additional Thread Adaptor ................................................. 12

3 MAINTENANCE .......................................................................................................... 14

Figures

Figure 1 DIN43650 Transmitter Unpacking Method ......................................................... 2

Figure 2 Connector Terminal Block Removal ................................................................... 3

Figure 3 Wiring Connections ......................................................................................... 3

Figure 4 Connector Installation...................................................................................... 4

Figure 5 Connector Installation...................................................................................... 5

Figure 6 2-Wire Connection Diagram ............................................................................. 5

Figure 7 Maximum Load of Easidew - Including Cable Resistance .................................... 6

Figure 8 Installation Location ........................................................................................ 7

Figure 9 Transmitter Mounting - Sensor Block ................................................................. 8

Figure 10 Material Permeability Comparison ..................................................................... 9

Figure 11 Dead volume ................................................................................................ 10

Figure 12 Transmitter Mounting - Pipe or Duct ............................................................... 11

Figure 13 Transmitter Mounting with Adapter ................................................................ 13

Figure 14 Replacement of HDPE Guard .......................................................................... 14

Figure 15 Dimensions - Easidew ................................................................................... 17

Appendices

Appendix A Technical Speciﬁ cations ...................................................................................16

Appendix B Quality, Recycling & Warranty Information ........................................................19

Appendix C Return Document & Decontamination Declaration ..............................................21

Easidew Transmitter User’s Manual

Michell Instruments v

Safety

The manufacturer has designed this equipment to be safe when operated using the procedures detailed in this manual. The user must not use this equipment for any other purpose than that stated. Do not apply values greater than the maximum value stated.

This manual contains operating and safety instructions, which must be followed to ensure the safe operation and to maintain the equipment in a safe condition. The safety instructions are either warnings or cautions issued to protect the user and the equipment from injury or damage. Use competent personnel using good engineering practice for all procedures in this manual.

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.

Pressure Safety

DO NOT permit pressures greater than the safe working pressure to be applied to the instrument. The speciﬁ ed safe working pressure is 45 MPa (450 barg / 6500 psig). Refer to the Technical Speciﬁ 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 be maintained either by the manufacturer or an accredited service agent. For Michell Instruments’ contact information please go to www.michell.com.

Calibration

The recommended calibration interval for this instrument is 12 months unless it is to be used in a mission-critical application or in a dirty or contaminated environment in which case the calibration interval should be reduced accordingly. The instrument should be returned to the manufacturer, Michell Instruments Ltd., or one of their accredited service agents for re-calibration.

Safety Conformity

This product meets the essential protection requirements of the relevant EU and US standards and directives. Further details of applied standards may be found in the Technical Speciﬁ cations in Appendix A.

Easidew Transmitter User’s Manual

vi 97504 Issue 2, May 2018

Abbreviations

The following abbreviations are used in this manual:

barg pressure unit (=100 kP or 0.987 atm) gauge ºC degrees Celsius ºF degrees Fahrenheit DC direct current ft-lbs foot-pound force g grams in inch(es) m micrometer m/sec meters per second mA milliampere max maximum mm millimetres MPa megapascal Nl/min normal liters per minute Nm Newton meter oz ounces ppm

parts per million by volume psig pounds per square inch RH relative humidity scfh standard cubic feet per hour scfs standard cubic feet per second T temperature V Volts  Ohms ø diameter

Warnings

The following general warning listed below is applicable to this instrument. It is 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.

Easidew Transmitter User’s Manual

Michell Instruments 1

INTRODUCTION

1 INTRODUCTION

The Michell Instruments Easidew is a 4-20mA loop-powered dew-point transmitter, designed to make dew point measurements in a ﬂ owing sample. The Easidew transmitter is available with 3 different process connections:

• 5/8" - 18 UNF : Easidew 2-wire, Easidew M12

• 3/4" - 16 UNF : Easidew 34, Easidew M12

• G1/2 : Easidew M12

The Easidew 2-wire is available with a choice of electrical connections:

• DIN 43650 Form C

• M12 5-Pin

Easidew Transmitter User’s Manual

2 97504 Issue 2, May 2018

INSTALLATION

2 INSTALLATION

2.1 Unpacking the Instrument

On delivery, please check that all the following standard components are in the packing tube:

• Easidew Transmitter

• Certiﬁ cate of Calibration

• Connector (for sensor/cable)

The Transmitter will also be supplied with a process seal, which will be ﬁ tted to the unit. Depending on the version, this will either be a bonded seal (5/8" or G1/2" thread versions) or an o-ring seal (3/4" thread versions).

Unpack the dew-point transmitter tube as follows:

87653 421

Figure 1

DIN43650 Transmitter Unpacking Method

1. Unscrew the cap (1) from the packing tube (8).

2. Remove the foam block (3) containing the connector (2).

3. Pull out the transmitter (5) from the tube, complete with the two foam

covers (6) and (7) and the red protective cap (4).

4. Remove the foam covers from the transmitter but leave the blue plastic

protective cover (5) and the red cap (4) in place until ready for installation.

NOTE: The transmitter sensing element is protected while in transit by a blue cover containing a small desiccant capsule. The connection pins are protected by a red plastic cap. None of these plastic items are required for the operation of the transmitter.

NOTE: Keep the connector (2) in a safe place until the transmitter is ready for wiring.

Easidew Transmitter User’s Manual

Michell Instruments 3

INSTALLATION

2.2 Preparation of the Sensor Cable

The sensor cable is NOT supplied as standard. Cables can be obtained by contacting your local Michell Instruments representative (see www.michell.com for details).

DIN 43650 Version

Cable connection to the Easidew transmitter is made via the removable connector. Removing the central screw enables the connector terminal block to be removed from the outer housing by using a small screwdriver to prise it clear.

O-ring

and washer

Figure 2

Connector Terminal Block Removal

Caution: When removing the central screw ensure that the

small sealing O-ring and the washer are retained on the screw

and are present during re-installation.

The sensor cables are terminated as per the following diagram:

SCALE 2:1

SHORT

AS POSSIBLE

BLUE

BRAID

GREEN 4-20 mA

(SOURCE)

SCREEN

RED

+POWER

GND

VIEW ON REAR

OF CONNECTOR

GREEN

SIGNAL (SOURCE)

GREEN

YELLOW

BLUE

RED

BLUE - GND / SCREEN RED + POWER

GREEN 4-20 mA

BLUE - GND / SCREEN

RED + POWER

RD BL

Figure 3

Wiring Connections

Note: The screen should only be connected to a ground point at either the transmitter installation side, or at the receiving equipment. Failure to observe this precaution can result in ground loops and equipment malfunction.

Easidew Transmitter User’s Manual

4 97504 Issue 2, May 2018

INSTALLATION

Always connect the 4-20 mA return signal to a suitable load

(see

Figure 3)

before the power is applied. Without this

connection, the transmitter may be damaged if allowed to

operate for prolonged periods.

M12 5-Pin Version

Cables with moulded M12 connectors are available from Michell Instruments in the following lengths:

• 0.8m

• 2m

• 5m

4-20 mA 2-wire

PIN 1 Modbus B PIN 2 Modbus A PIN 3 4-20 mA PIN 4 Power supply PIN 5 0V

Figure 4

Sensor Connector Installation

The other end of the sensor cable is unterminated, for straightforward connection into the desired monitoring system.

CABLE ASSEMBLY CONNECTIONS FUNCTION PIN WIRE COLOUR

MODBUS B 1 BROWN MODBUS A 2 WHITE 4 - 20 mA 3 BLUE POWER SUPPLY 4 BLACK Ov 5 GREY

If longer cable runs are required, off-the-shelf 5-pin M12 cables can be connected between the Easidew transmitter and the cable provided by Michell Instruments.

Note: The screen should only be connected to a ground point at either the transmitter installation side, or at the receiving equipment. Failure to observe

Figure 5

Cable connections

Easidew Transmitter User’s Manual

Michell Instruments 5

INSTALLATION

this precaution can result in ground loops and equipment malfunction.

2.3 Cable Connection

DIN 43650 Version

To ensure the speciﬁ ed ingress protection is achieved, when installing the connector, the securing screw (with the O-ring and washer) must be tightened to a minimum torque of 3.4 Nm (2.5 ft-lbs). The sensor cable used must be a minimum diameter of 4.6mm (0.2”).

O-ring

and washer

Figure 6

Connector Installation

M12 5-Pin Version

The connector should be installed by aligning the locating pin on the transmitter with the slot on the cable. The connector can then be pushed into place and rotated until ﬁ nger-tight.

2.4 Electrical Schematic

Max Load 200R @ 12V 500R @ 24V

Supply 12V Min 28V Max

Screen/ Shield

Figure 7

2-Wire Connection Diagram

+ 25 hidden pages

Michell Instruments Easidew User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual