Michell Instruments Easidew Online User manual

Easidew Online
Dew-Point Hygrometer
User’s Manual
°Cdp
°Fdp
Easidew Online Hygrometer
97094 Issue 18.5
March 2016

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© 2016 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.
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°Fdp
For Michell Instruments' contact information please go to
www.michell.com
Easidew Online

Easidew Online User’s Manual
iv 97094 Issue 18.5, March 2016
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 Easidew Transmitter ........................................................................................... 6
2.4 Monitor.............................................................................................................. 7
2.5 Monitor Panel Layout .......................................................................................... 7
2.6 Function Keys..................................................................................................... 9
2.7 Mounting the Monitor ....................................................................................... 10
2.8 Electrical Connections ....................................................................................... 11
2.8.1 AC Power Supply Input................................................................................ 12
2.8.2 DC Power Supply Input (Optional)................................................................ 13
2.8.3 Preliminary System Test............................................................................... 14
2.9 Mounting the Sample Block and Transmitter ....................................................... 14
2.9.1 Sample Block Gas Connections..................................................................... 14
2.10 Preparation of the Transmitter cable .................................................................. 16
2.11 Cable Connection ............................................................................................. 17
2.12 Electrical Schematic .......................................................................................... 17
2.12.1 Electrical Boundaries ................................................................................... 18
2.13 Transmitter Mounting........................................................................................ 18
2.13.1 Transmitter Mounting - Sample Block (Optional)............................................ 19
2.13.2 Transmitter Mounting - Direct Pipeline Connection......................................... 20
2.13.3 Transmitter Mounting - With Additional Process Connection Adapter .............. 21
2.13.4 Monitor Connection ..................................................................................... 22
2.14 Signal Output 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 System Alarms ................................................................................................. 27
3.3.1 Alarm Switching Logic (Default) ................................................................... 27
3.3.2 Reversal of Alarm Switching Logic ................................................................ 28
3.3.3 Alarm Level Set-Up ..................................................................................... 30
3.3.4 Re-Transmitted Output Current Range Set-Up ............................................... 31
3.4 Operating Temperature / ppmVRange ............................................................... 32
3.4.1 Temperature Range Default ......................................................................... 32

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Michell Instruments v
3.4.2 Span and Unit Settings ............................................................................... 33
3.4.3 Alarm Set-Point Limit Configuration .............................................................. 34
3.4.4 Scale Units to ppmVSet-Up.......................................................................... 35
3.4.5 Monitor Limits When Unit Scaled to ppmV.................................................... 36
3.5 Digital Communication Parameters Set-Up.......................................................... 37
3.6 Monitor – Reading the Displayed Value Using Modbus RTU Over RS232................ 39
4 GOOD MEASUREMENT PRACTICE .....................................................................40
4.1 General Operational Guidelines ......................................................................... 41
4.2 Maintenance and Calibration ............................................................................ 42
4.2.1 Clean Monitor ............................................................................................ 42
4.3 Fault Conditions ............................................................................................... 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 Easidew Transmitter ...................................................................................6
Figure 8 Monitor Panel Layout ..................................................................................7
Figure 9 Mounting the Monitor ...............................................................................10
Figure 10 AC Power Supply Connections ...................................................................12
Figure 11 DC Power Supply Connections ...................................................................13
Figure 12 Sample Block Gas Connections ..................................................................15
Figure 13 Connector Terminal Block Removal ............................................................16
Figure 14 Wiring Connections...................................................................................16
Figure 15 Connector Installation...............................................................................17
Figure 16 2-Wire Connection Diagram.......................................................................17
Figure 17 Maximum Load of Easidew - Including Cable Resistance..............................18
Figure 18 Transmitter Mounting - Sensor Block..........................................................19
Figure 19 Transmitter Mounting - Pipe or Duct...........................................................20
Figure 20 Transmitter Mounting with Adapter ...........................................................21
Figure 21 Transmitter Connections............................................................................22
Figure 22 Monitor Rear Panel Connections ................................................................23
Figure 23 Typical Display .........................................................................................26
Figure 24 Change Alarm Switching Logic...................................................................29
Figure 25 Set-up Alarm Levels..................................................................................30
Figure 26 Configure Analog Output...........................................................................31
Figure 27 Span and Unit Settings .............................................................................33
Figure 28 Set-up Alarm Set-Point Limits ....................................................................34
Figure 29 Set-up Monitor (to read ppmV )...................................................................36
Figure 30 Set-up Data Communications Parameters ...................................................38
Figure 31 Installation Location .................................................................................41
Figure 32 Indication of Dead Space ..........................................................................41
Figure 33 Dimensions .............................................................................................47
Figure 34 RS232 Connections...................................................................................49

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vi 97094 Issue 18.5, March 2016
Appendices
Appendix A Technical Specifications.............................................................................. 45
A.1 Dimensions ................................................................................. 47
Appendix B RS232 Data Communications Port Connections (Optional) ............................ 49
Appendix C EC Declaration of Conformity...................................................................... 51
Appendix D Quality, Recycling & Warranty Information................................................... 53
D.1 Pressure Equipment Directive (PED) 97/23/EC ............................... 53
D.2 Recycling Policy .......................................................................... 53
D.3 WEEE Compliance........................................................................ 53
D.4 RoHS2 Compliance ...................................................................... 54
D.5 Warranty..................................................................................... 54
D.6 REACH Compliance ...................................................................... 55
D.7 Calibration Facilities ..................................................................... 55
D.8 Return Policy ............................................................................... 56
D.9 Manufacturing Quality .................................................................. 56
Appendix E Return Document & Decontamination Declaration........................................ 58
Tables
Table 1 Monitor Front Panel Controls and Indicators ..................................................8
Table 2 Function Keys..............................................................................................9
Table 3 Summary of Electrical Connections ............................................................. 24

Easidew Online User’s Manual
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 specified 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
ppmVparts per million (by volume)
RS232 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
ΩOhms
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 moisture content in non-corrosive gases, over an operational
range of -100 to +20ºCdp (-148 to +68ºFdp).
The system comprises a programmable monitor configured to accept a 4-20 mA current
loop signal from an impedance-type dew-point temperature measurement 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 buffers the transmitter output for
onward transmission to other systems. The transmitter input to the monitor is configured
as a 4-20 mA current loop signal and the re-transmitted output can be configured as
either a 4-20 mA or a 0-20 mA current loop signal (ranged as per the input).
Two alarm outputs (high and low) 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.
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
297094 Issue 18.5, March 2016
INTRODUCTION
1.1 Features
The Easidew Online Hygrometer is simple to use and install, and can be configured to
meet specific needs.
• 5/8”- 18 UNF process connections
• Dew-point or ppmVmoisture 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 certificate (traceable to NPL and NIST)

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 fixing clamps (1) as shown below.
SMART OUTPUT Module System
Process Indicator
°Cdp
°Fdp
12
Figure 4 Monitor Unpacking Method

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Michell Instruments 5
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
9
°Cdp
°Fdp
Easidew Online
Dew-Point Hygrometer
User’s Manual
97211 Issue 01, May 2010
Figure 6 Easidew Online Components
1. Monitor clamps (2 off)
2. Easidew Monitor
3. Transmitter cable assembly
4. Power cable
5. Screwdriver
6. User’s Manual
7. Calibration certificate
8. Sample block
9. Easidew transmitter

Easidew Online User’s Manual
697094 Issue 18.5, March 2016
INSTALLATION
2.3 Easidew Transmitter
NOTE: The transmitter’s sensing element is shown for illustration purposes
only. Please keep the HDPE or SS guard fitted at all times, if possible.
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Electrical Connector
Transmitter Cover
Transmitter Label
Hexagonal Nut
Process Connection
Sensing Element
Figure 7 Easidew Transmitter

Easidew Online User’s Manual
Michell Instruments 7
INSTALLATION
2.4 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 RS232 communications port and
the external power supply are all made to the rear panel of the monitor.
Figure 8 shows the layout of these controls and Tables 1 and 2 describe their respective
operational functions.
Dew-point temperature units are displayed by one of the two LED’s located to the left
of the display. On delivery, °Cdp is set-up as standard. If required, the units can be
changed to °F. The method of configuring the unit for °F is described in Section 3.4.
Optionally, the instrument can be set-up to read dew point in parts per million (ppmV),
range 0 to 3000 ppmV. This option requires the transmitter to be set-up for ppmVeither
at the time of ordering or subsequently via Michell application software. NOTE: No
specific ppmVLED indicator is provided on the monitor; ppmVis selected if
neither the °Cdp nor the °Fdp temperature indicators are illuminated.
Two temperature alarm indications are provided by two LEDs located on the right hand
side of the display. These are marked AL1 (low) and AL2 (high). Access to the alarm
relay contacts is provided on the rear panel. The connection for these alarm relay
contacts is shown in Section 2.13.
NOTE: Every display is factory fitted with 2 alarm relays as standard.
2.5 Monitor Panel Layout
Easidew Online Hygrometer
6
Figure 8
Monitor Panel Layout

Easidew Online User’s Manual
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INSTALLATION
Item Description
1
°Fdp
When illuminated, this LED indicates that the displayed dew-point reading is in degrees
Fahrenheit.
Note: If neither the °Fdp or °Cdp LED is lit, ppmVis selected.
2
°Cdp
When illuminated, this LED 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 dew-point temperature display
Flashes to alternately indicate ErrL (error low) and temperature reading for low
temperatures under-range (lower than -100°Cdp (-148°Fdp) or -129.9°Cdp (199.9°Fdp)
for an open loop condition).
Flashes to alternately indicate ErrH (error high) and temperature reading for high
temperature over-range.
4
AL1
When illuminated, this LED indicates that the dew-point temperature programmed
for Alarm 1 has exceeded the programmed threshold. Under these conditions the
alarm relay contacts associated with this alarm (normally open) will change state
(close) and will remain closed until the dew-point temperature moves back within
the programmed operational limit.
Alarm 1 is usually allocated to the Low alarm setting.
These relay contacts are rated at 250 V, 3 A and are connected as shown in Section 2.13.
Section 3.3.3 describes the setting up of AL1 trip points.
5
AL2
When illuminated this LED indicates that the dew-point temperature programmed for
Alarm 2 has exceeded the programmed threshold. Under these conditions the alarm
relay changeover contacts associated with this alarm will change state and will remain in
this state until the temperature moves back to within the programmed operational limit.
Alarm 2 is usually allocated to the High alarm setting.
These changeover relay contacts are rated at 250 V, 5 A and are connected as shown
in Section 2.13.
Section 3.3.3 details the setting up of AL2 trip points.
6PSET
The four function keys are used for setting up the
monitor.
Table 2 describes the operation of the keys.
Table 1 Monitor Front Panel Controls and Indicators

Easidew Online User’s Manual
Michell Instruments 9
INSTALLATION
2.6 Function Keys
The function key panel is shown in Figure 8 .
Table 2 describes the operation of the keys.
Item Description
PP(Program) key
This key is used to access the programming menus and to select
sub-menus within the list.
Left arrow (decrement) key
This key is used to access sub-menus and, within individual sub-
menus, to decrease the numeric value of the selected parameter.
Right arrow (increment) key
This key is used to access sub-menus and, within individual sub-
menus, to increase the numeric value of the selected parameter.
SET
SET key
Depending upon the context, this key is used to access the set
value of the selected process field and as an Accept key for new
parameter values.
Table 2 Function Keys

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INSTALLATION
2.7 Mounting the Monitor
The monitor is designed for panel mounting and requires a panel cut-out of 46 x 92mm
(1.8 x 3.6”). The recommended panel thickness is 2 to 5mm (0.08 to 0.2”).
To mount the unit, proceed as follows (refer to
Figure 9):
1. Pass the monitor (1) through the front of the panel (2).
2. Support the monitor and insert the hook on the topside of the clamp (3)
into the slot (4) located on top of the monitor casing.
3. Tighten the fixing screw (5) finger tight, against the back of the panel.
4. Insert the hook on the second clamp (6) into the slot located on the
underside of the instrument casing and tighten the fixing screw, finger
tight, against the back of the panel.
5. Ensure that the monitor is sitting flush to the front of the panel (2) and
tighten the fixing screws evenly against the back of the panel.
Caution: Do not overtighten the screws as this could cause
the case to crack.
1
2
4
3
5
6
Figure 9 Mounting the Monitor

Easidew Online User’s Manual
Michell Instruments 11
INSTALLATION
2.8 Electrical Connections
Electrical connections to the Easidew Online system are as follows:
• 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.
• 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, 5 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.

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12 97094 Issue 18.5, March 2016
INSTALLATION
2.8.1 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 10 . Refer also to Table
3 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 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.