PST Michell Instruments Liquidew I.S. User manual

97092 Issue 5.3
September 2021
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Liquidew I.S.
Process Moisture Analyzer
User Manual

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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© 2021 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.
Liquidew I.S.
Process Moisture Analyzer
For Michell Instruments' contact information please go to
www.michell.com

Liquidew I.S. User Manual
iv 97092 Issue 5.3, September 2021
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 Performance Features ..................................................................................................... 2
1.2 Applications .................................................................................................................... 2
1.3 Theory of Operation ........................................................................................................ 3
1.4 System Components ....................................................................................................... 4
1.4.1 User Interface .......................................................................................................... 5
1.4.2 Power Supply and Input/Output Signal ....................................................................... 7
1.5 Sampling System ............................................................................................................ 8
2 INSTALLATION ............................................................................................................. 9
2.1 Unpacking the Analyzer ................................................................................................... 9
2.2 Operating Requirements .................................................................................................10
2.2.1 Environmental Requirements ....................................................................................10
2.2.2 Power Requirement ..................................................................................................10
2.3 Mounting ......................................................................................................................10
2.3.1 Control Unit Installation ............................................................................................10
2.3.2 Mounting the Liquidew I.S. Sensor Assembly into the Sampling System .......................12
2.3.3 Sampling System Installation ....................................................................................14
2.4 Wiring ...........................................................................................................................15
2.4.1 Overall Wiring Arrangement ......................................................................................15
2.4.2 Control Unit Wiring ..................................................................................................16
2.4.2.1 Power Supply Input Connection ..........................................................................18
2.4.2.2 Sensor Signal Input Connection ..........................................................................20
2.4.2.3 Analog Output Connection .................................................................................21
2.4.2.4 Alarm Output Connection ...................................................................................22
2.4.2.5 RS485 Port Connection ......................................................................................23
2.4.3 Sensor Assembly Wiring ...........................................................................................24
2.4.3.1 Dew-point Transmitter Wiring .............................................................................24
2.4.3.2 Temperature Transmitter Wiring .........................................................................27
3 OPERATION ............................................................................................................... 29
3.1 Preparation ...................................................................................................................29
3.2 Start-Up ........................................................................................................................29
3.2.1 Function Keys Activation ...........................................................................................29
3.2.2 Powering-up the Analyzer .........................................................................................30
3.2.3 Sample Flow Start-Up...............................................................................................31
3.3 Menu Structure ..............................................................................................................32
3.4 Main Reading Page ........................................................................................................34
3.5 Liquid Set-Up .................................................................................................................34
3.5.1 Liquid Selection .......................................................................................................34
3.5.2 User-Dened Liquid ..................................................................................................35
3.5.3 Liquid Mixing ...........................................................................................................36
3.6 Analog Output 1 (Moisture Content or Dew Point - User-Selectable) ..................................38
3.6.1 Output Source Selection ...........................................................................................38
3.6.2 Output Range ZERO Value Settings ...........................................................................39
3.6.3 Output Range SPAN Value Settings ...........................................................................39
3.7 Analog Output 2 (Sample Temperature - Only) .................................................................39

Liquidew I.S. User Manual
Michell Instruments v
3.8 System Fault Alarm Set-Up .............................................................................................40
3.8.1 Minimum Dew-Point Value for the Fault Alarm ............................................................40
3.8.2 Maximum Dew-Point Value for the Fault Alarm ...........................................................40
3.8.3 Minimum Temperature Value for the Fault Alarm ........................................................41
3.8.4 Maximum Temperature Value for the Fault Alarm .......................................................41
3.9 Alarm Setting ................................................................................................................42
3.9.1 Alarm Set-Point Adjustment ......................................................................................42
3.9.2 Alarm Type Selection ................................................................................................43
3.9.3 Alarm Source Selection .............................................................................................44
3.10 Display Brightness Adjustment ........................................................................................45
Tables
Table 1 Liquid List ........................................................................................................... 34
Figures
Figure 1 Liquidew I.S. Control Unit .......................................................................................1
Figure 2 Structure of the Michell Ceramic Moisture Sensor .....................................................3
Figure 3 Major Components of the Liquidew I.S. ...................................................................4
Figure 4 User Interface .......................................................................................................5
Figure 5 Dimensions of the Control Unit .............................................................................10
Figure 6 Rack Mounting Method .........................................................................................11
Figure 7 Liquidew I.S. Sensor Assembly ..............................................................................12
Figure 8 Overall Wiring Arrangement ..................................................................................15
Figure 9 Control Unit Electrical Connections ........................................................................17
Figure 10 POWER INPUT Socket ..........................................................................................18
Figure 11 POWER INPUT Connector Block ............................................................................19
Figure 12 SENSOR INPUTS Connector Block .........................................................................20
Figure 13 OUTPUT Connector Block .....................................................................................21
Figure 14 ALARM Connector Block .......................................................................................22
Figure 15 Crimped Wires .....................................................................................................25
Figure 16 Cut to 5mm .........................................................................................................25
Figure 17 Dew-Point Transmitter Housing ............................................................................25
Figure 18 Dew-Point Transmitter Pin Assignment Drawing......................................................26
Figure 19 Temperature Transmitter Housing .........................................................................27
Figure 20 Temperature Transmitter Pin Assignment Drawing ..................................................28
Figure 21 Units of Measurement Readings in Sequence .........................................................30
Figure 22 Menu Maps ..........................................................................................................33
Figure 23 Dimensional Drawings ..........................................................................................49

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vi 97092 Issue 5.3, September 2021
Appendices
Appendix A Technical Specications .........................................................................................47
A.1 Dimensional Drawings ............................................................................49
Appendix B Serial Communications ..........................................................................................51
Appendix C Modbus RTU Comms .............................................................................................56
Appendix D Hazardous Area Certication ..................................................................................59
D.1 Product Standards .................................................................................59
D.2 Product Certication...............................................................................59
D.3 Global Certicates/Approvals ..................................................................59
D.4 Terminal Parameters ..............................................................................60
D.5 Special Conditions ..................................................................................60
D.6 Maintenance and Installation ..................................................................60
Appendix E System Drawings ..................................................................................................62
E.1 Baseefa Approved System Drawing .........................................................62
E.2 QPS Approved System Drawing ...............................................................63
Appendix F Quality, Recycling & Warranty Information ..............................................................65
Appendix G Return Document & Decontamination Declaration ...................................................67

Liquidew I.S. User 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. The input power supply voltage is 85...265 V AC
or 10...72 V DC. Refer to labels on instrument or calibration certicate.
Pressure Safety
DO NOT permit pressures greater than the safe working pressure, as dened in the published
specications, to be applied to the instrument.
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.
Long exposure to, or breathing of, the calibration gases may be dangerous.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. Refer
to www.michell.com for details of Michell Instruments’ worldwide oces contact information.
Calibration
The recommended calibration interval for the analyzer is 12 months (6 months or less for aggressive
uids) depending on the application in which the instrument is used. Please consult Michell
Instruments for the specic calibration interval (refer to www.michell.com for details of Michell
Instruments’ worldwide oces contact information.).
Safety Conformity
This product meets the essential protection requirements of the relevant UK, EU and US standards
and directives. Further details of applied standards may be found in the Technical Specications in
Appendix A.

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viii 97092 Issue 5.3, September 2021
Abbreviations
The following abbreviations are used in this manual:
A Ampere
AC alternating current
barg pressure unit (=100 kP or 0.987 atm) gauge
°C degrees Celsius
°F degrees Fahrenheit
DC direct current
dp dew point
GPM gallons per minute
” inch(es)
lbf-ft pound force per foot
l/min liters per minute
Nm newton meter
mA milli Ampere
psig pressure in pound(s) per square inch (gauge)
ppmW parts per million by weight
T temperature
V Volts
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.

Liquidew I.S. User Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The Liquidew I.S. Process Moisture Analyzer is a continuous, on-line instrument for
the measurement of absolute moisture content in a liquid. It is designed to full a
wide range of applications and provide for the monitoring and/or control of moisture
in liquids. The instrument consists of two component parts: the control unit and the
sensors (moisture and temperature transmitters). They are individually calibrated to a
single standard allowing for total interchangeability between combinations of sensors
and control units.
The range of the instrument is 0...500 parts per million by weight (ppmW). There are
8 pre-set liquid options available for the CS data used in moisture calculation, together
with 2 user-dened solutes and an ability to mix any 2 liquids from the list. Four alarm
relay contacts are provided which are user-congurable in set-point and operating
mode. The current output is factory set at 4...20 mA.
The Liquidew I.S. Control Unit must be placed in a non-hazardous area suitable for
electronic analytical equipment. The moisture and temperature transmitters can be
positioned close to the process sample take-o point in a Zone 0, 1 or Zone 2 (Class I,
Division 1, Groups A, B, C & D) hazardous area. The control unit and transmitters are
connected via a standard 2-wire instrumentation cable protected by safety isolation
interface units.
Figure 1 Liquidew I.S. Control Unit

Liquidew I.S. User Manual
297092 Issue 5.3, September 2021
INTRODUCTION
1.1 Performance Features
• State-of-the-art ceramic moisture sensor with chemically inert materials
coupled with physical resilience provides long-term reliability in the most
arduous applications. Robust construction is exceedingly durable in liquid.
Not aected by pressure shocks.
• High integrity moisture in liquid measurement from 0.01ppmW to saturation
level at +20ºC (68ºF).
• Sample Analysis over temperature range 0...+50ºC maximum (32...122ºF)
• Two 4...20 mA outputs with congurable units / ranges. RS485 Modbus RTU
communication. Four built-in user-adjustable alarm contacts.
• Assured measurement accuracy with each sensor calibrated across the
entire measurement range and certied traceable to NPL (UK) and NIST
(USA).
• Certied intrinsically safe.
• Replaceable sensor element with Michell Calibration Exchange Service for
professional, scheduled and low cost recalibration to minimize downtime
and cost.
• Up to four independent measurement channels with any combination of
moisture in gas and moisture in liquid measurement at low per-channel
cost.
• Customized sampling systems to meet even the most demanding
applications.
1.2 Applications
• Petrochemical process liquids monitoring
• Catalyst protection
• Prevents acid formation during reactor process
• Controls moisture in solvents for polymer production
• Monitor liquid fuels to avoid supply line blockage
• Lubricant oil monitoring for preventative maintenance
• Monitor transformer oil to prevent insulation breakdown

Liquidew I.S. User Manual
Michell Instruments 3
INTRODUCTION
1.3 Theory of Operation
Reliable and robust sensor design is fundamental to achieving accurate measurement of
moisture in liquids over a long period of time. Proprietary thick- and thin-lm techniques
are applied in the Michell Ceramic Moisture Sensor. Base metal layers, on semi-conductor
grade ceramic substrate, sense dissolved moisture within the sample liquid ow. The
inert materials of the sensor have a high resistance to aggressive media while the
inherent strength of the sensor and the thermal bonded connections to the active
device ensures reliable operation even in dense uid samples.
Permeable Gold film
Hygroscopic Mono-layer
Base Electrode
Ceramic Substrate




Figure 2 Structure of the Michell Ceramic Moisture Sensor
The ceramic moisture sensor exhibits a direct response to partial pressure of moisture
vapor. Calibration is certied traceable to NPL (UK) and NIST (USA) through the use of
dew-point transfer standards.
With the Liquidew I.S. the amount of dissolved moisture dispersed throughout the
immiscible process liquid is measured on-line in real time (in units of ppmW moisture
content) using Henry’s Law.
According to Henry’s Law: C = xPW
CS
___
Psat
Where: C = Moisture content
CS = Saturation moisture content at the analysis temperature
PW = Water vapor pressure from dew-point sensor measurement
Psat = Saturation water vapor pressure at the analysis temperature
CS/ Psat = K (Henry constant)
The impedance sensor measures PW.. To calculate C, the CS must be known.
The advanced rmware of the Liquidew I.S. provides moisture measurements in ppmW
through the application of Henry’s Law using pre-programmed saturation concentration
(CS) values for the most common pure hydrocarbon liquid applications. A proportional
mixing setting can be used for mixtures of two solutes, i.e. propane and butane in LPG.
Two user-programmable entry tables enable CS values to be entered for other solutes or
for complex uid compositions where the user may wish to enter CS values from:
• their own sources
• laboratory analysis of process samples
• estimated values from proportional calculation based on the CS values for
each of the major components in the solute mix

Liquidew I.S. User Manual
497092 Issue 5.3, September 2021
INTRODUCTION
1.4 System Components
The Liquidew I.S. Process Moisture Analyzer consists of:
• the sensor assembly
• the control unit
a
b
c



Sensor Assembly
Control Unit
(Up to four channels can have any combination of Liquidew I.S. and Promet I.S.*)
a Temperature transmitter
b Sensor block
c Dew-point transmitter
d User interface
e Electrical connections - to hazardous area
f Electrical connections - non-hazardous
Figure 3 Major Components of the Liquidew I.S.
* Promet I.S. is a sister product of the Liquidew I.S. and is used for moisture in gas
measurement

Liquidew I.S. User Manual
Michell Instruments 5
INTRODUCTION
1.4.1 User Interface
The Liquidew I.S. user interface is located on the control unit. There is a two-line, six
digit (15 segment) LED display and four alarm indicators. Five push-button function
keys facilitate data display, parameter setting and system adjustment.
Men
u
S
elect
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Ala
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4
3
2
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39
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.
.
L
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.
Figure 4 User Interface
The operation of the function keys are shown below and more information can be found
in Section 3.
• Menu key:
Menu
The Menu key is used to enter and exit the set-up menu.
At any level within the set-up menu, press and hold the Menu
key to return to the default screen.
• Select key:
Select
The Select key is used to enter the sub-menu and to conrm the
selection.
•  key:
The  key is used to scroll up through pages in the top and sub-
level menus and to increase values in sub-level menus.

Liquidew I.S. User Manual
697092 Issue 5.3, September 2021
INTRODUCTION
•  key:
The  key is used to scroll down through pages in the top and
sub-level menus and to decrease values in sub-level menus.
• Display key
Display
The Display key is used to change the display unit (see Section
3.2.2).
The four LED alarm indicators will light up when the specic alarm relay is activated.
Settings for the alarm relays are explained in Section 3.99.

Liquidew I.S. User Manual
Michell Instruments 7
INTRODUCTION
1.4.2 Power Supply and Input/Output Signal
The terminal blocks for the power supply, signal input, signal output and alarm output
are located on the back panel of the control unit (as shown in Figure 9) .
• Power Supply
The Liquidew I.S. requires either 85...265 V AC or 10...72 V DC power input,
depending on the model ordered.
• Signal Input
There are two 4...20 mA signal input channels from the dew-point and
temperature sensors to the control unit. Both input channels are isolated by
built-in galvanic type I.S. barriers.
• Signal Output
There are two 4...20 mA linear signal output channels. The output channel 1
is used for the dew point, moisture or temperature signal, with congurable
ranges. Output channel 2 has a xed temperature signal and cannot be
congured.
There is one RS485 Modbus RTU digital communication port. Please refer to
Appendix B.
• Alarm Output
There are four alarm relays. Alarms 1 and 2 are Form C contacts rated 10A
/ 240 V AC or 8A / 24 V DC, non-inductive load. Alarms 3 and 4 are Form
A contacts rated 5A / 240 V AC or 4A / 24 V DC, non-inductive load. The
control actions and set points of these four alarms are user-programmable.
A fault alarm with adjustable set points is also included.

Liquidew I.S. User Manual
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INTRODUCTION
1.5 Sampling System
The Liquidew I.S. requires a clean sample of the process liquid that meets the
temperature, pressure and ow requirements of the transmitter. The design of the
sampling system will depend on the specic application.
The requirements for the sample liquid going into the sensor block are as follows:
• Temperature: 0...+40 °C (+32...+104 °F) (maximum +60 °C (+140 °F))
NOTE: Sample temperature must be above the moisture saturation
temperature of the sample uid
• Maximum pressure: 45 MPa (450 barg / 6526 psig)
• Flow rate: 0.1...0.3 l/min (0.026...0.079 GPM)
NOTE: Contact Michell Instruments if you wish to order a specic sampling
system.
Please refer to the Liquidew I.S. Premium Sampling System Instructions if a Michell
sampling system has been ordered with the Liquidew I.S.

Liquidew I.S. User Manual
Michell Instruments 9
INSTALLATION
2 INSTALLATION
It is essential that the installation of the electrical and liquid
supplies to this analyzer be undertaken by suitably qualied
personnel.
2.1 Unpacking the Analyzer
Unpack carefully as follows:
a. Remove the accessories (if ordered).
b. If no accessories have been ordered the delivery should contain following
items:
• Liquidew I.S. control unit
• Liquidew I.S. sensor assembly (if a sampling system has been
ordered the sensor assembly should already be mounted in the
sampling system)
• User manual
• Certicates of calibration and conformity
• Power lead (only for 85...265 V AC version)
c. Remove the Liquidew I.S. sensor assembly from the box.
d. Lift out the control unit together with its end packing pieces.
e. Remove the end packing pieces and set the control unit down at the site
of installation. Save all the packing materials for the purpose of returning
the instrument to the manufacturer for service.
If ordered, the Liquidew I.S. Premium Sampling System will be shipped in a separate
box.

Liquidew I.S. User Manual
10 97092 Issue 5.3, September 2021
INSTALLATION
2.2 Operating Requirements
2.2.1 Environmental Requirements
The Liquidew I.S. sensor assembly is intrinsically safe and designed to be installed on-
site, indoors or outdoors, directly at the point of measurement within a Hazardous Area.
The sensor assembly is ATEX, IECEx and QPS certied. To operate correctly, the sensor
assembly must be installed within a suitable sampling system (Michell Instruments can
supply standard and custom designed sampling systems).
The Liquidew I.S. control unit is NOT designed for use in a Hazardous Area and should
only be installed in a safe area. The control unit is intended for indoor installation only
and operates within environmental limits of 0...+50 °C (+32...+122 °F) and <90%RH.
The control unit contains built-in isolation barriers permitting connection, direct from
the Hazardous Area, of the Liquidew I.S. sensor assembly.
2.2.2 Power Requirement
The Liquidew I.S. control unit can be ordered for either of the following electrical
supplies:
• 85...265 V AC, 47/63 Hz @ 4W max 10W
OR
• 10...72 V DC @ 4W max 10W
The Liquidew I.S. sensor assembly is powered through the 2-wire signal cable directly
from the control unit.
Please refer to the Liquidew I.S. Premium Sampling System Instructions for the power
requirement of the sampling system.
2.3 Mounting
2.3.1 Control Unit Installation
The Liquidew I.S. control unit is contained in a 19” sub-rack case (size 3U). It should be
installed in a 19” rack using the mounting holes provided. It must be placed in a position
free from any appreciable vibration and shaded from direct sunlight.
NOTE: The materials and construction of the control unit allow for operation
in an indoor, clean, non-hazardous only, control room environment.
Easidew PRO I.S. Process Dewpoint Transmitter
20mm
(0.8”)
328mm
(12.9”)
CHANNEL 1
CHANNEL 2
CHANNEL 3
CHANNEL 4
483mm
(19”)
375mm + 100mm for cable clearance
(14.75” + 3.9”)
3U
132mm
(5.2”)
Sample port
1/8” NPT (F)
Figure 5 Dimensions of the Control Unit

Liquidew I.S. User Manual
Michell Instruments 11
INSTALLATION
Figure 6 Rack Mounting Method
Figure 6 illustrates the general method for fitting a rack mount instrument into a
standard 19” rack. To fit the unit proceed as follows:
a. Remove all terminal blocks for the electrical connections.
b. If necessary, remove any covers from the rack cabinet to gain access to
the rear and side.
c. Connect up the sensor input, analog and alarm output terminal blocks
to the internal rack wiring, ensuring that there is sucient free cable to
permit withdrawal of the instrument from the rack.
d. Slide the instrument into the rack and support its weight while the four
xing screws are inserted.
e. Ensure that the front panel of the instrument is ush and square with the
front of the rack and tighten the xing screws.
f. Insert the terminal blocks into their respective sockets on the rear of the
instrument.
g. Connect the power supply cable and switch the ON/OFF switch to ON.
h. Re-t any covers to the rack as necessary.
NOTE: Allow a minimum clearance depth of 100mm (4”) behind the instrument
housing for cables and vents.

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INSTALLATION
2.3.2 Mounting the Liquidew I.S. Sensor Assembly into the Sampling System
HIGH PRESSURE! High pressure liquids are potentially
hazardous. Energy stored in these liquids can be released
suddenly and with extreme force. High pressure systems
should be assembled and operated only by people who have
been trained in proper safety practices.
NOTE: If the analyzer has been ordered with a sampling system, the Liquidew
I.S. sensor assembly will have been installed and tested in the factory. In
that case disregard the following section and go to Section 2.3.3.
Figure 7 Liquidew I.S. Sensor Assembly
The Liquidew I.S. sensor assembly consists of:
1 Dew-point transmitter - Easidew PRO I.S.
2 Temperature transmitter
3 Sensor block
To assemble, proceed as follows:
a. Remove the protective cap on the dew-point transmitter (Easidew PRO
I.S.) before installation and retain for future use. Take care to prevent any
contamination of the sensor before installation (do not touch or handle
the sintered guard - located on the tip of the Easidew PRO I.S.).
b. The dew-point transmitter has a 5/8” UNF parallel mounting thread which
should be installed directly into the sampling block with the bonding
seal provided. The bonded seal provided should be placed over
the transmitter mounting thread before it is screwed into the
sampling block.
c. Finger-tighten the dew-point transmitter by gripping the spanner/wrench
ats on the body - NOT the transmitter body cover. Completely tighten
using a spanner/wrench until the bonded seal is fully compressed to a
minimum torque of 30.5 Nm (22.5 lbf-ft).