PST MICHELL Instruments Easidew Advanced Online User manual

Easidew
Advanced Online Hygrometer
User Manual
97621 Issue 1
March 2022

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Use this information when contacting Michell Instruments for service purposes.
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© 2022 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 Advanced Online Hygrometer
For Michell Instruments' contact information please go to
www.michell.com

Easidew Advanced Online Hygrometer Manual
iv 97621 Issue 1, March 2022
Contents
Safety ................................................................................................................................vi
Electrical Safety ..........................................................................................................vii
Pressure Safety ...........................................................................................................vii
Hazardous Materials (WEEE, RoHS3 & REACH) ..............................................................vii
Repair and Maintenance ..............................................................................................vii
Calibration ..................................................................................................................vii
Safety Conformity .......................................................................................................vii
Abbreviations .................................................................................................................... viii
1 INTRODUCTION ................................................................................................1
1.1 Features ............................................................................................................ 1
2 INSTALLATION ..................................................................................................2
2.1 Unpacking the Instrument ................................................................................... 2
2.1.1 Unpacking the Easidew Advanced Online Sensor ............................................. 3
2.1.2 Unpacking the Process Monitor ...................................................................... 3
2.2 Easidew Advanced Online Components ................................................................ 4
2.3 Process Monitor Display ...................................................................................... 5
2.3.1 Process Monitor Display Layout ...................................................................... 5
2.3.2 Electrical Connections .................................................................................... 6
2.3.2.1 High-Voltage Power Supply Input ................................................................... 6
2.3.2.2 Low-Voltage Power Supply Input (Alternative) ................................................. 7
2.3.2.3 Dew-Point Sensor Modbus RTU over RS485 Digital Input (Required) ................ 7
2.3.2.4 Pressure Sensor Input (Optional) ................................................................... 8
2.3.2.5 Analog Outputs ............................................................................................. 8
2.3.2.6 Modbus RTU Output ...................................................................................... 8
2.3.2.7 Relay Outputs ............................................................................................... 9
2.3.2.8 Transmitter Connections ................................................................................ 9
2.4 Mounting the Process Monitor ........................................................................... 10
2.5 Easidew Transmitter ......................................................................................... 11
2.5.1 Easidew M12 Connector Version ................................................................... 11
2.5.1.1 Electrical Connections .................................................................................. 12
2.5.1.2 Easidew M12 Cables .................................................................................... 13
2.5.2 Cable Selection for Self-Assembled Cables ..................................................... 13
2.6 Transmitter Mounting ........................................................................................ 14
2.6.1 5/8” 18 UNF Version .................................................................................... 14
2.6.2 3/4” - 16 UNF Version ................................................................................. 14
2.6.3 G1/2” BSPP Version ..................................................................................... 14
2.6.4 Transmitter Mounting – Sample Block .......................................................... 15
2.6.5 Transmitter Mounting – Direct Pipeline Connection ........................................ 16
2.6.6 Transmitter Mounting – With Additional Process Connection Adapter .............. 17
2.7 Mounting the Sample Block and Transmitter ....................................................... 18
2.7.1 Sample Block Gas Connections ..................................................................... 18
3 OPERATION ....................................................................................................20
3.1 Process Monitor Conguration ........................................................................... 20
3.2 Front Panel Conguration Menu Access .............................................................. 20
3.3 Conguration Menu Explained ........................................................................... 22
3.4 Setting Up the Process Monitor Conguration ..................................................... 23
3.4.1 Alarms Conguration ................................................................................... 23
3.4.2 Analog Outputs Conguration ...................................................................... 26
3.4.3 Display Conguration .................................................................................. 28
3.4.4 Input Conguration ..................................................................................... 29

Easidew Advanced Online Hygrometer Manual
Michell Instruments v
Figures
Figure 1 Unpacking Method ......................................................................................2
Figure 2 Transmitter Unpacking Method ....................................................................3
Figure 3 Easidew Advanced Online Components ........................................................4
Figure 4 Monitor Display in Normal Operation ............................................................5
Figure 5 AC and DC Power Supply Connections ..........................................................6
Figure 6 Dew-Point Sensor Connections ....................................................................7
Figure 7 Pressure Sensor Connections .......................................................................8
Figure 8 Analog Output Connections .........................................................................8
Figure 9 Modbus RTU Output Connections ................................................................8
Figure 10 Relay Output Connections ...........................................................................9
Figure 11 Easidew Transmitter .................................................................................11
Figure 12 Sensor Connector Installation ....................................................................12
Figure 13 Transmitter Mounting – Sensor Block .........................................................15
Figure 14 Transmitter Mounting – Pipe or Duct ..........................................................16
Figure 15 Transmitter Mounting with Adapter ...........................................................17
Figure 16 Sample Block Gas Connections ..................................................................18
Figure 18 Alarm Conguration Screen Explained .......................................................23
Figure 17 Electrical Wiring Schematic........................................................................23
Figure 19 Analog Outputs Conguration Screen Explained ..........................................26
Figure 20 Display Conguration Screen Explained ......................................................28
Figure 21 Input Conguration Screen Explained .........................................................29
Figure 22 Installation Location .................................................................................35
Figure 23 Installation Location .................................................................................35
Figure 24 Material Permeability Comparison ..............................................................37
Figure 25 Dead volume ............................................................................................38
Appendices
Appendix A Technical Specications .............................................................................. 39
Appendix B Process Monitor Register Map ..................................................................... 43
Appendix C Quality, Recycling & Warranty Information ................................................... 53
Appendix D Return Document & Decontamination Declaration ........................................ 55
3.4.5 Pressure Conguration ................................................................................ 31
3.4.6 About Menu ................................................................................................ 32
4 MAINTENANCE ................................................................................................33
4.1 Maintenance and Calibration ............................................................................ 33
4.2 Fault Conditions ............................................................................................... 33
5 MEASUREMENT GUIDE ....................................................................................34
5.1 Sampling Considerations ................................................................................... 34
5.2 Sampling Hints ................................................................................................. 37

Easidew Advanced Online Hygrometer Manual
vi 97621 Issue 1, March 2022
Safety
The instrument is designed to be completely safe when installed and operated correctly in accordance
with the information provided in this manual.
This manual contains all the required information to install, operate and maintain this product. Prior
to installation and use of this product, this entire manual should be read and understood. Installation
and operation of this product should be carried out by suitably competent personnel only. The
installation and operation of this product must be in accordance with the instructions provided and
according to the terms of any associated safety certicates. Incorrect installation and use of this
product other than those described in this manual and other than its intended purpose will render
all warranties void.
This product meets the essential protection requirements of the relevant EU & UK directives. Further
details of applied directives may be found in the product specication.
Electricity and pressurized gas can be dangerous. This product must be installed and operated only
by suitable trained personnel.
!
No user serviceable parts inside
!
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.
Where this symbol appears in the following sections it is used to
indicate areas of potential risk of electric shock.
This product is intended for use only under the following conditions:
a. indoor use
b. altitude up to 2 000 m
c. temperature 5 °C to 40 °C
d. maximum relative humidity 80 % for temperatures up to 31 °C decreasing
linearly to 50 %, relative humidity at 40 °C
e. MAINS supply voltage uctuations up to ±10 % of the nominal voltage
f. TRANSIENT OVERVOLTAGES up to the levels of OVERVOLTAGE CATEGORY ll
g. TEMPORARY OVERVOLTAGES occurring on the MAINS supply
h. applicable POLLUTION DEGREE 2 of the intended environment

Easidew Advanced Online Hygrometer Manual
Michell Instruments vii
Electrical Safety
Ensure electrical safety is complied with by following the directions provided here and observing all
local operation & installation requirements at the intended location of use.
This product is completely safe when using any options and accessories supplied by the manufacturer
of this product for use with it. Refer to Section 2 (Installation) of this manual for further details.
Pressure Safety
For this product to operate satisfactorily, pressurized gas must be connected to it. Observe all the
information contained within this manual and all local operation & installation requirements at the
intended location of use. Refer to Section 2 (Installation) of this manual for further details.
Hazardous Materials (WEEE, RoHS3 & REACH)
This product does not contain or release any prohibited chemicals listed on the SVHC (Substances
of Very High Concern) Candidate List. During the intended normal operation of this product it is not
possible for the user to come into contact with any hazardous materials. This product is designed to
be recyclable except where indicated.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. For
contact information visit the website at www.michell.com.
Calibration
Periodic re-calibration is recommended in order to maintain the highest quality of measurement in
your application. Michell Instruments recommends that you have your Easidew M12 transmitter re-
calibrated annually unless it is used in a mission-critical application or in a contaminated environment,
in which case the calibration interval should be reduced accordingly.
Michell Instruments can oer a variety of re-calibration and exchange transmitter schemes to suit
your specic needs. A local representative will be pleased to provide detailed custom advice.
Safety Conformity
This product meets the essential protection requirements of the relevant EU & UK directives. Further
details of applied standards may be found in Appendix C.

Easidew Advanced Online Hygrometer Manual
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Abbreviations
The following abbreviations are used in this manual:
AC alternating current
atm pressure unit (atmosphere)
barg pressure unit (=100 kP or 0.987 atm)
ºC degrees Celsius
ºF degrees Fahrenheit
DC direct current
dp dew point
ft foot (feet)
g gram(s)
Hz Hertz
“ inch(es)
lb pound
l/min liters per minute
m meter(s)
µm micro-meter
mA milliampere
max maximum
min minute(s)
MPa megapascal (Pascals x106)
Nl/min normal liters per minute
Nm Newton meter
ppmV parts per million (by volume)
rh relative humidity
scfh standard cubic feet per hour
V Volts
Ω Ohms

Easidew Advanced Online Hygrometer Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The Easidew Advanced Online Hygrometer is easy to install and congure; this versatile
touch screen hygrometer can measure and display dew point and moisture content and
indicate pressure. This display provides analog, digital and 4 programmable relay alarm
outputs with front screen or software app display conguration.
It has been developed as a premium-performance hygrometer system for use in a wide
variety of applications.
It can display data in °C or °F dew point, ppmV , lb/mmscf or g/m3, from -110 up to +20 °C
(-166 up to +68 °F), at pressures up to 450 bar (6627 psi).
To calculate moisture content from dew point, it is necessary to know the system pressure.
This hygrometer can either compensate for pressure change by using a live pressure
sensor input, or accept a xed pressure input value.
1.1 Features
The Easidew Advanced Online Hygrometer oers customers the following features:
• Measurement range -110...+20 °C (-166...+68 °F) dew point
• Dew point or moisture content output
• Accuracy ±1 °C (±1.8 °F) dew point
• Pressure indication and compensation
• Touch screen display conguration
• 3 x 4...20 mA output and 4 relay outputs
• Modbus RTU over RS485 output
• Choice of AC or DC Power Supply
• Sample block and cable included
• Traceable 13-point calibration certicate

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INSTALLATION
2 INSTALLATION
!
It is essential that the connection of electrical and gas supplies
to this instrument be undertaken by competent personnel.
2.1 Unpacking the Instrument
The Easidew instruments and accessories are packed into a box and the method of
unpacking is shown as follows:
Figure 1 Unpacking Method
Open the box and unpack carefully as follows. Save all the packing materials for the
purpose of returning the instrument for re-calibration or any warranty claims.
1. Remove the top packing
2. Remove the dew-point transmitter box
3. Remove the accessories pack
4. Remove the Process Monitor box

Easidew Advanced Online Hygrometer Manual
Michell Instruments 3
INSTALLATION
2.1.1 Unpacking the Easidew Advanced Online Sensor
NOTE: For environmental and operating conditions refer to Appendix A.
Unpack the dew-point transmitter box as follows :
7653 421
Figure 2 Transmitter Unpacking Method
1. Unscrew the cap (1) from the packing tube (6). Remove the foam block (2).
1. Remove the transmitter from the tube, complete with the body cover (4)
and tip cover (5).
2. Remove the body cover (4) and the tip cover (5) but leave the blue plastic
protective cover (3) in place until ready for installation.
NOTE: The transmitter sensing element is protected while in transit by a blue,
green or black 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: Packaging specications are subject to continuous improvement, as
we reduce our use of plastics and move to cardboard packing systems.
2.1.2 Unpacking the Process Monitor
The Process Monitor is packed in a cardboard box, together with its xing clamps.

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INSTALLATION
2.2 Easidew Advanced Online Components
On delivery please check that all the following standard components are present in the
packing box. Report any shortages to Michell Instruments, immediately.
1
2
3
4
5
6
7
97211 Issue 01, May 2010
Figure 3 Easidew Advanced Online Components
1. Monitor clamps (2 o)
2. Easidew Advanced Online Hygrometer
3. Transmitter cable assembly
4. Screwdriver
5. Calibration certicate
6. Sample block
7. Easidew M12 Transmitter

Easidew Advanced Online Hygrometer Manual
Michell Instruments 5
INSTALLATION
2.3 Process Monitor Display
The display within the Process Monitor is an LCD 320 x 240 pixel software driven, touch
screen color display.
2.3.1 Process Monitor Display Layout
In normal operation, the display screen will appear as below.
The display shows a moisture and pressure value, the status of four alarms and a
display locked/unlocked symbol, which is all explained in detail in Figure 4 below.
2
1
3
4
1Dew Point or Moisture Content value referenced to its congured scale
2Pressure Indication value referenced to its congured pressure scale
3Alarm Status of the 4 relay outputs
4Security code protected Unlock button to access the conguration menu
Figure 4 Monitor Display in Normal Operation

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INSTALLATION
2.3.2 Electrical Connections
Electrical connections to the Easidew Online system are as follows:
• AC power supply input, 85...265V AC (7.5 VA)
• Alternative low-voltage DC input is also available: 18...30V DC (170 mA
@24V DC)
• Dew-Point Sensor Modbus RTU over RS485 digital input (24V DC loop
power provided by monitor)
• Pressure Sensor 2-wire 4...20 mA current loop (24V DC loop power
provided by monitor) input (optional)
• Modbus RTU over RS485 digital communications interface
• 3 x programmable 4...20 mA analog outputs for assigning to dew point,
moisture content and pressure parameters
• 2 x Form A, 2 x Form C Namur compliant programmable relay outputs for
process and fault conditions
The power supply voltage is indicated on the connection detail label located on the
Process Monitor. As the Process Monitor is provided for continuous operation, it does
not have an ON/OFF switch.
The power supply to the Process Monitor may be one of the following, dependent on
the type ordered.
2.3.2.1 High-Voltage Power Supply Input
For high-voltage powered display
• 85...265V AC 50/60 Hz
It is essential that the connection of electrical supplies to this
instrument is undertaken by competent personnel.
Connect the power supply to the monitor as shown in Figure 5 below.
PIN 14 – Earth
PIN 15 – Neutral
PIN 16 – Live
Figure 5 AC and DC Power Supply Connections

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Michell Instruments 7
INSTALLATION
2.3.2.2 Low-Voltage Power Supply Input (Alternative)
For low-voltage DC powered display
• 18...30V DC
Connect the power supply to the DC version Process Monitor as shown in Figure 5 .
PIN 15 – 0V DC
PIN 16 – 18...30V DC
2.3.2.3 Dew-Point Sensor Modbus RTU over RS485 Digital Input (Required)
For AC or DC voltage powered display version
Connect the Dew-Point Sensor to the Process Monitor as shown in Figure 6.
PIN 1 – +24V DC Power
PIN 2 – RS485 A digital comms
PIN 3 – RS485 B digital comms
PIN 6 – 0V DC Power
Figure 6 Dew-Point Sensor Connections

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INSTALLATION
2.3.2.4 Pressure Sensor Input (Optional)
For AC or DC voltage powered display version
Connect the Pressure Sensor to the monitor as shown in Figure 7 .
PIN 4 – +24 V DC Power
PIN 5 – 4...20 mA signal return
PIN 6 – 0V DC Power
Figure 7 Pressure Sensor Connections
2.3.2.5 Analog Outputs
For AC or DC voltage powered display version
PIN 7 – 4...20 mA Current Source Output 1
PIN 8 – 4...20 mA Current Source Output 2
PIN 9 – Common
PIN 10 – 4...20 mA Current Source Output 3
Figure 8 Analog Output Connections
2.3.2.6 Modbus RTU Output
Figure 9 Modbus RTU Output Connections

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Michell Instruments 9
INSTALLATION
2.3.2.7 Relay Outputs
For AC or DC voltage powered display versions, the relay outputs are shown below in
Figure 10 .
Figure 10 Relay Output Connections
2.3.2.8 Transmitter Connections
Connect the Easidew M12 dew-point sensor as shown in the table in Figure 12 .

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INSTALLATION
2.4 Mounting the Process Monitor
The Process Monitor is designed for panel mounting and requires a panel cut-out of 44
x 92 mm (1.73 x 3.62”). The recommended panel thickness is 2...5 mm (0.08...0.2”).
To mount the unit, proceed as follows:
1. Pass the Process Monitor through the front of the panel.
2. Support the Process Monitor and attach mounting xing brackets
onto the side of the monitor.
3. Tighten the xing screw nger tight, against the back of the panel.
Recommended maximum torque is 30 cNm using a 1.5 mm Allen
key.
4. Ensure that the Process Monitor is sitting ush to the front of the
panel and tighten the xing screws evenly against the back of the
panel.
Caution: Do not overtighten the screws as this could cause the case to crack.

Easidew Advanced Online Hygrometer Manual
Michell Instruments 11
INSTALLATION
2.5 Easidew Transmitter
NOTE: The transmitter’s sensing element is shown for illustration purposes
only. Please keep the guard tted at all times, if possible.
Figure 11 Easidew Transmitter
2.5.1 Easidew M12 Connector Version
The following sections apply to the M12 connector version of the transmitter shown
below.

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INSTALLATION
2.5.1.1 Electrical Connections
Sensor
Connector
Pin
Michell
Standard
Conductor
Color
Function Process
Monitor
Connection
Pin No.
1Brown Modbus A 2
2White Modbus B 3
3 Blue 4...20 mA Signal Return (Power Supply -ve)
(not used – see note)
6
4Black Power Supply +ve 1
5Grey Ground, Cable Screen Connection
This pin directly connects to the metal casing
of the transmitter, but not to the transmitter
electronics, and is intended for cable screening
only.
Selected
ground
connection
point
Figure 12 Sensor Connector Installation
NOTE: The sensor cable is supplied as standard. Replacement pre-wired cables
can be obtained by contacting your local Michell Instruments representative
or assembled by the user according to instructions in the following section.
NOTE: The sensor transmits its output to the Process Monitor via the RS485
Modbus RTU Communications signal on Pins 1 and 2.