Michell Instruments Easidew Pro IS Operating Manual
Easidew PRO I.S.
Process Dew-Point Transmitter
User’s Manual
Easidew PRO I.S.
Process Dewpoint Transmitter
97130 Issue 16.1
November 2019
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Transmitter
Code
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Transmitter
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Easidew PRO I.S.
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www.michell.com
© 2019 Michell Instruments
This document is the property of Michell Instruments Ltd and may not be copied or
otherwise reproduced, communicated in any way to third parties, nor stored in any Data
Processing System without the express written authorization of Michell Instruments Ltd.
Easidew PRO I.S. User’s Manual
Contents
Safety ................................................................................................................................vi
Electrical Safety ...........................................................................................................vi
Pressure Safety ............................................................................................................vi
Toxic Materials .............................................................................................................vi
Repair and Maintenance ...............................................................................................vi
Calibration ...................................................................................................................vi
Safety Conformity ........................................................................................................vi
Abbreviations ..................................................................................................................... vii
Warnings .......................................................................................................................... viii
1 INTRODUCTION ................................................................................................1
1.1 Features ............................................................................................................ 1
2 INSTALLATION ..................................................................................................2
2.1 Unpacking the Instrument ................................................................................... 2
2.2 Transmitter Mounting .......................................................................................... 2
2.2.1 Wall Mount Bracket ....................................................................................... 3
2.2.2 Transmitter Mounting - Sample Block (Optional) ............................................. 4
2.2.3 Transmitter Mounting - Direct Pipeline Connection ........................................... 5
2.2.4 Transmitter Mounting - With Additional Process Connection Adapter ................ 6
2.3 Preparation of the Sensor Cable .......................................................................... 7
2.4 Electrical Schematic ............................................................................................ 8
2.4.1 Electrical Boundaries ..................................................................................... 8
3 OPERATION ......................................................................................................9
3.1 Measurement and Conguration .......................................................................... 9
3.2 Sampling Hints ................................................................................................... 9
4 GOOD MEASUREMENT PRACTICE .....................................................................11
5 MAINTENANCE ................................................................................................14
Figures
Figure 1 Wall-Mount Bracket ....................................................................................3
Figure 2 Transmitter Mounting - Sensor Block ............................................................4
Figure 3 Transmitter Mounting - Pipe or Duct.............................................................5
Figure 4 Transmitter Mounting with Adapter .............................................................6
Figure 5 Wire and Crimp Details ...............................................................................7
Figure 6 Terminal Block Connection ..........................................................................7
Figure 7 Hazardous Area Connection.........................................................................8
Figure 8 Maximum Load of Easidew PRO I.S. - Including Cable Resistance .................8
Figure 9 Indication of Dead Space ..........................................................................10
Figure 10 Material Permeability Comparison ..............................................................11
Figure 11 Replacement of Sensor Guard ...................................................................14
Figure 12 Dimensions ..............................................................................................18
iv 97130 Issue 16.1, November 2019
Easidew PRO I.S. User’s Manual
Appendices
Appendix A Technical Specications .............................................................................. 16
A.1 Dimensions ................................................................................. 17
Appendix B System Drawings .......................................................................................20
B.1 Baseefa Approved System Drawing ...............................................20
B.2 FM Approved System Drawing ...................................................... 21
B.3 CSA Approved System Drawing .....................................................22
Appendix C Hazardous Area Certication ......................................................................24
C.1 Product Standards ....................................................................... 24
C.2 Product Certication ....................................................................24
C.3 Global Certicates/Approvals ........................................................ 24
C.4 Terminal Parameters .................................................................... 24
C.5 Special Conditions........................................................................25
C.6 Maintenance and Installation ........................................................ 25
Appendix D Quality, Recycling & Warranty Information ...................................................27
Appendix E Return Document & Decontamination Declaration ........................................ 29
Michell Instruments v
Easidew PRO I.S. User’s Manual
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 specied safe working pressure is 45 MPa (450 barg / 6500 psig). Refer to Appendix A, Technical
Specications.
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. Refer
to www.michell.com for details of Michell Instruments’ worldwide oces contact information.
Calibration
The recommended calibration interval for the Easidew PRO I.S. is 12 months. The instrument should
be returned to Michell Instruments or one of their accredited service agents for re-calibration.
Safety Conformity
This product meets the essential protection requirements of the relevant EU directives. Further
details of applied standards may be found in the Technical Specications, Appendix A.
vi 97130 Issue 16.1, November 2019
Easidew PRO I.S. User’s Manual
Abbreviations
The following abbreviations are used in this manual:
bara bar absolute
barg pressure unit (=100 kP or 0.987 atm) gauge
°C degrees Celsius
°F degrees Fahrenheit
DC direct current
μm micro-meter
lbf-ft pound foot
Nl/min normal liters per minute
mA milliampere
Mpa megapascal
m/sec meters per second
mW milli Watts
nF nano-Farad
Nm Newton meter
ppmV parts per million by volume
RH relative humidity
scfh standard cubic feet per hour
scfs standard cubic feet per second
V Volts
Michell Instruments vii
Warnings
The following general warning listed below is applicable to this instrument. It is repeated
in the text in the appropriate locations.
Easidew PRO I.S. User’s Manual
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.
viii 97130 Issue 16.1, November 2019
Easidew PRO I.S. User’s Manual
1 INTRODUCTION
The Easidew PRO I.S. has been manufactured, tested and calibrated to the highest
available standards and should arrive in perfect working order, ready for installation into
a gas or liquid measurement application.
For questions about the instrument or how to install and operate it, contact your local
representative. Refer to www.michell.com for details of Michell Instruments’ worldwide
oces’ contact information.
1.1 Features
The Easidew PRO I.S. is a continuous, on-line, 4-20 mA transmitter for the measurement
of moisture content in air, other non-corrosive gases and non-polar liquids. It is designed
specically for use within Zone 0, 1 & 2 hazardous areas.
INTRODUCTION
Its key features are:
• Measurement range -110 to +20°Cdp (-166 to +68°Fdp)
• Moisture in gases (ppmV) or liquids (ppmW)
• Hazardous area certications (ATEX, IECEx, FM, CSA, GOST)
• Calibration certicate (UKAS and NIST)
• Accuracy ±1°Cdp
• 2-wire and linear 4-20 mA output
• Non-standard outputs configurability
Michell Instruments 1
INSTALLATION
2 INSTALLATION
2.1 Unpacking the Instrument
On delivery, please check that all the following standard components are present in the
packing box:
• Easidew PRO I.S. Transmitter
• Bonded seal
• Certicate of calibration
• 3 o cable crimps
• Mounting bracket (optional)
Easidew PRO I.S. User’s Manual
The Easidew PRO I.S. is protected within the main packaging by a blue cap covering
the transmitter connector and a small desiccant capsule installed inside the plastic
protective transit cover. Neither of these items is required for the operation of the
Easidew PRO I.S.
Prior to installation of the Easidew PRO I.S., unscrew and remove the plastic protective
transit cover and retain for future use. Take care to prevent any contamination of the
transmitter before installation. NOTE: Do not handle the sintered guard.
2.2 Transmitter Mounting
The Easidew PRO I.S. Transmitter can be mounted either in a ow-through sampling
block (optional extra) or directly inserted into a pipe or duct and can be operated
at pressures up to 45 MPa (450 barg / 6500 psig) when tted with the bonded seal
provided.
For mounting instructions see Sections 2.2.2 or 2.2.3.
When installed, fully tighten using a wrench until the seal is fully compressed and to the
following torque settings:
• 5/8” - 18 UNF 30.5 Nm (22.5 ft-lbs)
The recommended uid ow rate, when mounted in the optional sampling block, is 1 to
5 Nl/min (2.1 to 10.6 scfh). However, for direct insertion applications, uid ow can be
from static to 10 m/sec (32.8 fps).
2 97130 Issue 16.1, November 2019
Easidew PRO I.S. User’s Manual
After installation into the ow stream, the Easidew PRO I.S. housing (provided it is not
mounted onto a wall bracket) may be positioned at any angle, through approximately
330º of rotation, to allow for the cable gland positioning. To position the housing loosen the large clamping nut suciently to allow free rotation of the sensor assembly
within the transmitter body.
The Easidew PRO I.S. is tted with a mechanical stop to
!
Rotate the sensor housing until the cable gland is in the desired position. While rmly
holding the housing in position, re-tighten the large clamp nut up against the housing
seal using a spanner/wrench of the correct size. NOTE: Do not apply excessive
force.
prevent over-rotation of the sensor assembly within the
transmitter body - this could damage the sensor wires.
INSTALLATION
2.2.1 Wall Mount Bracket
The Easidew PRO I.S. can be supplied with an optional wall-mounting bracket. This
allows the customer to physically support the transmitter, ensuring that the stress on
the mounting ange is kept to a minimum.
The bracket needs to be attached to the Easidew PRO I.S. (see
hex screws provided. It can be tted either horizontally or vertically and can then be
attached to a wall or plate to provide support for the transmitter.
Figure 1)
using the
Figure 1
Wall-Mount Bracket
Michell Instruments 3
INSTALLATION
Easidew PRO I.S. User’s Manual
2.2.2 Transmitter Mounting - Sample Block (Optional)
The following procedure must be carried out by a qualied
!
installation engineer.
To mount the transmitter into the sensor block (preferred method), proceed as follows,
refer to
Figure 2.
1. Remove the protective cover (2) (and its desiccant capsule) from the tip of
the transmitter (1).
2. Fit the seal (4) over the threaded part of the transmitter body.
WARNING: Under no circumstances should the sensor guard be
!
handled with the ngers.
3. Screw the transmitter (1) into the sample block (3) and tighten to the
recommended torque setting (see Section 2.2). NOTE: Use the ats of
the hexagonal nut and not the sensor body.
4. Connect a cable (5) to the connector terminal block (see Section 2.3).
2
1
Process Dewpoint Transmitter
Easidew PRO I.S.
Process Dewpoint Transmitter
Easidew PRO I.S.
5
3
4
Process Dewpoint Transmitter
Easidew PRO I.S.
Optional cable
and gland (available
on request)
Figure 2
Transmitter Mounting - Sensor Block
Process Dewpoint Transmitter
Easidew PRO I.S.
4 97130 Issue 16.1, November 2019
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