Michell Instruments EA2, M12 Operating Manual
Easidew
Dew-Point Transmitter
User’s Manual
97504 Issue 3.1
May 2019
Please ll out the form(s) below for each instrument that has been purchased.
Use this information when contacting Michell Instruments for service purposes.
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Serial Number
Invoice Date
Location of Instrument
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Transmitter
Code
Serial Number
Invoice Date
Location of Instrument
Tag No
Transmitter
Code
Serial Number
Invoice Date
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Easidew
For Michell Instruments' contact information please go to
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 Transmitter User’s Manual
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 Specications ...................................................................................17
Appendix B Quality, Recycling & Warranty Information ........................................................20
Appendix C Return Document & Decontamination Declaration ..............................................22
Appendix D Modbus Register Map ......................................................................................24
iv 97504 Issue 3.1, May 2019
Easidew Transmitter 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 the Technical
Specications 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 Specications in
Appendix A.
Michell Instruments v
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)
µm 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
V
psig pounds per square inch
RH relative humidity
scfh standard cubic feet per hour
scfs standard cubic feet per second
T temperature
V Volts
Ω Ohms
ø diameter
Easidew Transmitter User’s Manual
parts per million by volume
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.
vi 97504 Issue 3.1, May 2019
Easidew Transmitter User’s Manual
1 INTRODUCTION
The Michell Instruments Easidew is a 4-20mA loop-powered dew-point transmitter,
designed to make dew point measurements in a owing sample. The Easidew transmitter
is available with 3 dierent 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
INTRODUCTION
Michell Instruments 1
INSTALLATION
87653 421
2 INSTALLATION
2.1 Unpacking the Instrument
On delivery, please check that all the following standard components are in the packing
tube:
• Easidew Transmitter
• Certicate of Calibration
• Connector (for sensor/cable)
The Transmitter will also be supplied with a process seal, which will be 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:
Easidew Transmitter User’s Manual
Figure 1
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.
DIN43650 Transmitter Unpacking Method
2 97504 Issue 3.1, May 2019
Easidew Transmitter User’s Manual
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
INSTALLATION
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:
BRAID
SCALE 2:1
SHORT
AS POSSIBLE
+POWER
GREEN
SIGNAL (SOURCE)
1
3
RED
2
VIEW ON REAR
OF CONNECTOR
BLUE
GND
4
Figure 3
BRAID
SCREEN
GREEN
YELLOW
BLUE
RED
Wiring Connections
GN
RD
BL
GREEN 4-20 mA
RED + POWER
BLUE - GND / SCREEN
GREEN 4-20 mA
(SOURCE)
BLUE - GND / SCREEN
RED + POWER
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.
Michell Instruments 3
INSTALLATION
M12 5-Pin Version
Cables with moulded M12 connectors are available from Michell Instruments in the
following lengths:
• 0.8m
• 2m
• 5m
Easidew Transmitter User’s Manual
Always connect the 4-20 mA return signal to a suitable load
(see
Figure 3)
connection, the transmitter may be damaged if allowed to
PIN 1 Modbus B
PIN 2 Modbus A
PIN 3 4-20 mA
PIN 4 Power supply
PIN 5 0V
before the power is applied. Without this
operate for prolonged periods.
4-20 mA 2-wire
M12 5-WAY
A CODED
12
5
3 4
Figure 4
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
Sensor Connector Installation
Figure 5
If longer cable runs are required, o-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
this precaution can result in ground loops and equipment malfunction.
Cable connections
4 97504 Issue 3.1, May 2019
Easidew Transmitter User’s Manual
2.3 Cable Connection
DIN 43650 Version
To ensure the specied 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”).
INSTALLATION
O-ring
and washer
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
nger-tight.
2.4 Electrical Schematic
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.
3
1
Figure 6
Connector Installation
Screen/
Shield
Max Load
200R @ 12V
500R @ 24V
+
Supply
12V Min
28V Max
Figure 7
2-Wire Connection Diagram
Michell Instruments 5
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