Lauper Instruments Easidew Online User manual

Easidew Online
Dew-Point Hygrometer
User’s Manual
°Cdp
°Fdp
Easidew Online Hygrometer
97094 Issue 20
May 2020
Gas-Detection
Lauper Instruments AG
Irisweg 16B
CH-3280 Murten
Tel. [phone]
[email protected]
www.lauper-instruments.ch

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Use this information when contacting Michell Instruments for service purposes.
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© 2020 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.
°Cdp
°Fdp
For Michell Instruments' contact information please go to
www.michell.com
Easidew Online

Easidew Online User’s Manual
iv 97094 Issue 20, May 2020
Contents
Safety ...............................................................................................................................vii
Electrical Safety ..........................................................................................................vii
Pressure Safety ...........................................................................................................vii
Toxic Materials ............................................................................................................vii
Repair and Maintenance ..............................................................................................vii
Calibration ..................................................................................................................vii
Safety Conformity .......................................................................................................vii
Abbreviations .................................................................................................................... viii
Warnings .......................................................................................................................... viii
1 INTRODUCTION ................................................................................................1
1.1 Features ............................................................................................................ 2
2 INSTALLATION ..................................................................................................3
2.1 Unpacking the Instrument ................................................................................... 3
2.1.1 Unpacking the Easidew Transmitter ................................................................ 4
2.1.2 Unpacking the Monitor .................................................................................. 4
2.1.3 Accessories Pack ........................................................................................... 5
2.2 Easidew Online Components ............................................................................... 5
2.3 Monitor .............................................................................................................. 6
2.3.1 Fault Conditions ............................................................................................ 6
2.3.2 Monitor Controls and Indicators ..................................................................... 7
2.3.3 Electrical Connections .................................................................................... 8
2.3.4 AC Power Supply Input ................................................................................ 10
2.3.5 DC Power Supply Input (Optional) ................................................................ 11
2.3.6 Transmitter Connection ................................................................................ 12
2.3.7 Signal Output Connections ........................................................................... 13
2.3.7.1 Alarm Outputs ..................................................................................... 13
2.3.7.2 Re-transmission Output ........................................................................ 13
2.3.7.3 RS485 Modbus RTU Communications Port ............................................... 13
2.3.8 Mounting the Monitor .................................................................................. 14
2.4 Easidew Transmitter ......................................................................................... 15
2.5 Preparation of the Transmitter Cable .................................................................. 16
2.5.1 Electrical Connections .................................................................................. 16
2.5.2 Sensor Cable Assembly ................................................................................ 17
2.5.3 Cable selection for self-assembled cables ...................................................... 18
2.5.4 Maximum Loop Resistance vs Supply Voltage ................................................ 18
2.6 Cable Connection ............................................................................................. 19
2.7 Transmitter Mounting ........................................................................................ 19
2.7.1 Transmitter Mounting – Sample Block (Optional) ........................................... 20
2.7.2 Transmitter Mounting – Direct Pipeline Connection ........................................ 21
2.7.3 Transmitter Mounting – With Additional Process Connection Adapter .............. 22
2.8 Mounting the Sample Block and Transmitter ....................................................... 23
2.8.1 Sample Block Gas Connections ..................................................................... 23
3 OPERATION ....................................................................................................25
3.1 General Operational Information ....................................................................... 25
3.2 Preparation For Operation ................................................................................. 26
3.2.1 First-Time Operation .................................................................................... 26
3.3 Monitor Setup .................................................................................................. 27
3.3.1 Change alarm type (high/low) ...................................................................... 27
3.3.2 Change alarm set-points .............................................................................. 29

Easidew Online User’s Manual
Michell Instruments v
3.3.3 Analog output: change from 4–20mA to 0–20mA .......................................... 30
3.3.4 Monitor Input Range .................................................................................. 30
3.3.5 Set the monitor to °F dew-point mode ......................................................... 31
3.3.6 Set the monitor to ppmV mode ..................................................................... 32
3.3.7 Monitor Limits When Unit Scaled to ppmV .................................................... 33
3.3.8 Alarm Set-Point Limit Conguration .............................................................. 34
3.3.9 Digital Communication Parameters Set-Up .................................................... 35
3.4 Modbus RTU over RS485 Communications .......................................................... 37
4 GOOD MEASUREMENT PRACTICE .....................................................................41
4.1 General Operational Guidelines ......................................................................... 41
4.2 Maintenance and Calibration ............................................................................ 43
4.2.1 Clean Monitor ............................................................................................ 43
Figures
Figure 1 Easidew Online Monitor and Transmitter .......................................................1
Figure 2 Unpacking Method ......................................................................................3
Figure 3 Transmitter Unpacking Method ....................................................................4
Figure 4 Monitor Unpacking Method ..........................................................................4
Figure 5 Accessories Pack ........................................................................................5
Figure 6 Easidew Online Components .......................................................................5
Figure 7 Monitor Panel Layout ..................................................................................6
Figure 8 Monitor Rear Panel Connections ..................................................................9
Figure 9 AC Power Supply Connections ...................................................................10
Figure 10 DC Power Supply Connections ...................................................................11
Figure 11 Transmitter Connections............................................................................12
Figure 12 Digital Communications Port ......................................................................13
Figure 13 Mounting the Monitor ...............................................................................14
Figure 14 Easidew Transmitter .................................................................................15
Figure 15 Easidew Transmitter .................................................................................17
Figure 16 Easidew Transmitter .................................................................................17
Figure 17 Maximum Load of Easidew – Including Cable Resistance .............................18
Figure 18 Connector Installation ...............................................................................19
Figure 19 Transmitter Mounting – Sensor Block .........................................................20
Figure 20 Transmitter Mounting – Pipe or Duct ..........................................................21
Figure 21 Transmitter Mounting with Adapter ...........................................................22
Figure 22 Sample Block Gas Connections ..................................................................23
Figure 23 Typical Display .........................................................................................26
Figure 24 Change Alarm Switching Logic ...................................................................28
Figure 25 Set-up Alarm Levels ..................................................................................29
Figure 26 Congure Analog Output ...........................................................................30
Figure 27 Span and Unit Settings .............................................................................31
Figure 28 Set-up Monitor (to read ppmV ) ...................................................................33
Figure 29 Set-up Alarm Set-Point Limits ....................................................................34
Figure 30 Set-up Data Communications Parameters ...................................................36
Figure 31 Installation Location .................................................................................41
Figure 32 Indication of Dead Space ..........................................................................41
Figure 33 Dimensions .............................................................................................47

Easidew Online User’s Manual
vi 97094 Issue 20, May 2020
Appendices
Appendix A Technical Specications ..............................................................................45
A.1 Dimensions .................................................................................47
Appendix B Quality, Recycling & Warranty Information ................................................... 49
Appendix C Return Document & Decontamination Declaration ........................................51
Tables
Table 1 Monitor Front Panel Controls and Indicators ..................................................7
Table 2 Summary of Electrical Connections ...............................................................9

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Michell Instruments vii
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 specied safe working pressure (SWP), for this instrument is 45 MPa (450 barg / 6500 psig).
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
contact information visit the website at 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 directives.

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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) gauge
bara bar absolute
°C degrees Celsius
°F degrees Fahrenheit
DC direct current
ft foot (feet)
g gram(s)
Hz Hertz
lbf-ft pound force per foot
Nl/min normal liters per minute
m meter(s)
mA milliampere
max maximum
min minute(s)
mm millimeter(s)
MPa megapascal (Pascals x106)
m/sec meters per second
Nm Newton meter
ppmV parts per million (by volume)
RS485 serial data transmission standard
Rx receive
scfh standard cubic feet per hour
scfs standard cubic feet per second
SWP safe working pressure
sec second(s)
temp temperature
V Volts
Ω Ohms
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.

Easidew Online User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The Easidew Online dew-point hygrometer is an instrument designed for the continuous
online measurement of water dew point in gaseous sample streams, in a diverse range
of applications.
The system comprises a programmable monitor congured to accept a 4–20 mA current
loop signal from the Michell Easidew ceramic metal-oxide dew-point transmitter. The
span of the transmitter is set to cover the dew-point range -100 to +20ºCdp (-148 to
+68ºFdp) at operating pressures up to 45 Mpa (450 barg / 6500 psig).
The monitor also has a re-transmission facility which buers the transmitter output for
onward transmission to other systems. The transmitter input to the monitor is congured
as a 4–20 mA current loop signal and the re-transmitted output can be congured as
either a 4–20 mA or a 0–20 mA current loop signal (ranged as per the input).
Two alarm outputs are provided for connection to external systems. Alarm 1 provides
a set of single pole make contacts and Alarm 2 provides a set of changeover contacts.
Both sets are potential free and Alarm 1 contacts (single pole make) are rated at 250
V, 3 A and the Alarm 2 contacts (changeover) are rated at 250 V, 5 A.
A digital communications interface is also provided to enable retrieval of transmitter
values and fault status via Modbus RTU over RS485.
Figure 1 shows the monitor and the transmitter.
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Easidew Online Hygrometer
Figure 1 Easidew Online Monitor and Transmitter

Easidew Online User’s Manual
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INTRODUCTION
1.1 Features
The Easidew Online Hygrometer is simple to use and install, and can be congured to
meet specic needs.
• 5/8” - 18 UNF process connections
• Dew-point or ppmV moisture content
• IP66 (NEMA 4) Sensor and IP65 (NEMA 12) Monitor (front panel only)
• Measurement range -100 to +20°C (-148 to +68°Fdp)
• Dual alarms
• Accuracy ±2°Cdp
• Clear and easy to read display
• Calibration certicate (traceable to NPL and NIST)
• 4–20mA re-transmission
• Modbus RTU over RS485 digital communications

Easidew Online User’s Manual
Michell Instruments 3
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 2 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. Note that
the packing method may vary slightly in the U.S.
1. Remove the top packing (1)
2. Remove the dew-point transmitter box (3)
3. Remove the accessories pack (4)
4. Remove the monitor box (2)

Easidew Online User’s Manual
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INSTALLATION
2.1.1 Unpacking the Easidew Transmitter
NOTE: For environmental and operating conditions refer to Appendix A.
Unpack the dew-point transmitter box as follows :
7653 421
Figure 3 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
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.
2.1.2 Unpacking the Monitor
The monitor (2) is packed, together with its xing clamps (1) as shown below.
SMART OUTPUT Module System
Process Indicator
°Cdp
°Fdp
12
Figure 4 Monitor Unpacking Method

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INSTALLATION
2.1.3 Accessories Pack
The accessories pack is shown below.
1
2
3
4
Figure 5 Accessories Pack
Remove the screwdriver (1), the two leads (2) and (3) and the sample block (4) from
the bag.
2.2 Easidew 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
8
97211 Issue 01, May 2010
Figure 6 Easidew Online Components
1. Monitor clamps (2 o)
2. Easidew Monitor
3. Transmitter cable assembly
4. Power cable
5. Screwdriver
6. Calibration certicate
7. Sample block
8. Easidew transmitter

Easidew Online User’s Manual
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INSTALLATION
2.3 Monitor
The controls and indicators associated with the Easidew Online are located on the front
panel of the monitor.
Connections to the Easidew dew-point transmitter, the digital communications port and
the external power supply are all made to the rear panel of the monitor.
Easidew Online Hygrometer
6
Figure 7 Monitor Panel Layout
2.3.1 Fault Conditions
Message
Displayed Cause Action
ErrL
Sensor failure
Check power supply to transmitter. Check
transmitter cable for continuity/damage.
Rectify/replace cable
Instrument failure Refer to Michell or local representative for
repair
Sbr Sensor failure or break in
sensor connection
Check transmitter cable for continuity/
damage.
Rectify/replace cable
ErrH
Gas is wetter than +20°Cdp Check gas source supply
Sensor contaminated Replace/re-calibrate transmitter
outR Input out of range Check gas source supply.
Re-calibrate/replace transmitter
rurC Reverse input connection Swap input connections from the
transmitter to the monitor

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Michell Instruments 7
INSTALLATION
2.3.2 Monitor Controls and Indicators
Item Description
1
°F units indicator
Indicates that the displayed dew-point reading is in degrees Fahrenheit.
2
°C units indicator
Indicates that the displayed dew-point reading is in degrees Celsius.
Note: if neither the °Cdp nor °Fdp LED is lit, ppmVis selected.
3
Main reading display
Displays the value measured by the connected transmitter, or ashes one of the status
conditions shown in Section 2.3.1.
4
AL1
Indicates alarm relay 1 is active, which by default is a LOW alarm.
5
AL2
Indicates alarm relay 2 is active, which by default is a HIGH alarm.
Section 3.3.2 details the setting up of AL2 trip points.
6
Item Description
6.1 Program Key (P)
6.2 Left arrow (decrement)
6.3 Right arrow (increment)
6.4 Set Key (P)
Table 1 Monitor Front Panel Controls and Indicators
Launches the menu system. Also used as a back button to exit menus.
Scrolls through submenus OR decreases selected parameter.
Scrolls through submenus OR increases selected parameter.
Used to enter menus OR accept the new value of the currently
selected parameter.

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INSTALLATION
2.3.3 Electrical Connections
Electrical connections to the Easidew Online system are as follows:
Required:
• AC power supply, 100 to 240 V AC (-15%, +10%), 50/60 Hz, 6 VA. A low
voltage (24 V DC) option is also available.
Optional:
• Transmitter current loop input, 4–20 mA (24 V DC loop power provided
by monitor).
• Alarm 1 (Low), potential free contacts, single pole make. Contacts rated
at 250 V, 3 A.
• Alarm 2 (High), potential free contacts, single pole changeover. Contacts
rated at 250 V, 5 A.
• Re-transmitted input signal from the dew-point transmitter 4–20 mA or
0–20 mA.
• Modbus RTU over RS485 digital communications interface.

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Michell Instruments 9
INSTALLATION
Figure 8 Monitor Rear Panel Connections
Terminal Wire Colour Signal Supply Information
1Blue 0 V (GND) Transmitter Cable Screen
3Green 4–20 mA loop return
4Red Transmitter loop supply
(+ve) +24 V DC w.r.t. terminal 1
7User dened ALR2 (normally closed)
9
7
8
8User dened ALR2 (normally open)
9User dened ALR2 (common)
13 User dened Current loop out (-ve) Default 4–20 mA
14 User dened Current loop out (+ve) Default 4–20 mA
16 User dened ALR1 (common)
16
17
17 User dened ALR1 (normally open)
23 (AC Version) Blue Power in (neutral) 100 – 240 V, 50/60 Hz
24 (AC Version) Brown Power in (live) 100 – 240 V, 50/60 Hz
23 (DC Version) Blue Negative (-) 0 V
24 (DC Version) Brown Positive (+) 24 V
NOTE: There are no terminals in positions
5, 6, 10, 11, 12, 15, 18, 19, 20, 21 and 22
Table 2 Summary of Electrical Connections

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INSTALLATION
2.3.4 AC Power Supply Input
It is essential that the connection of electrical supplies to this
instrument be undertaken by competent personnel.
Connect the AC power supply to the monitor as shown in Figure 9 . Refer also to Table 2
which gives a summary of all the connections to the rear panel of the monitor.
14 15 16 17 18 19 20 21 22 23
2345678910 11
2
1
4
3
Monitor
viewed from underneath
Figure 9 AC Power Supply Connections
1. Ensure that no power is connected to the mains lead.
2. Connect the blue (white – US standard) (neutral) lead (2) to terminal 23
on the rear panel of the monitor.
3. Connect the brown (black – US standard) (live) lead (3) to terminal 24 on
the rear panel of the monitor.
4. Strip back the insulation on the free end of the power cable and wire to
an appropriate power supply plug (brown lead to live supply terminal,
blue lead to neutral supply terminal).
5. Check that the wiring has been completed correctly before connecting to
a mains power supply.

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Michell Instruments 11
INSTALLATION
2.3.5 DC Power Supply Input (Optional)
Connect the DC power supply to the monitor as shown in Figure 10 . Refer also to
Table 2 which gives a summary of all the connections to the rear panel of the monitor.
14 15 16 17 18 19 20 21 22 23
2345678910 11
-
+
2
1
4
3
Monitor
viewed from underneath
Figure 10 DC Power Supply Connections
1. Ensure that no power is connected to the mains lead.
2. Connect the blue (white – US standard) lead (2) to terminal 23 on the
rear panel of the monitor.
3. Connect the brown (black – US standard) lead (3) to terminal 24 on the
rear panel of the monitor.
4. Strip back the insulation on the free end of the power cable and wire
to an appropriate power supply plug (brown lead to positive (+) supply
terminal, blue lead to negative (-) supply terminal).
5. Check that the wiring has been completed correctly before connecting to
a 24 V power supply.

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INSTALLATION
2.3.6 Transmitter Connection
Connect the transmitter cable to the monitor as shown below:
14 15 16 17 18 19 20 21 22 23
2345678910 11
1
234
4
3
Monitor
viewed from above
2
Figure 11 Transmitter Connections
1. Connect the blue wire (2) of the transmitter cable to terminal 1 on the
monitor (1).
2. Connect the green wire (3) of the transmitter cable to terminal 3 on the
monitor.
3. Connect the red wire (4) of the transmitter cable to terminal 4 on the
monitor.
4. Check that the transmitter cable wiring has been completed correctly.