Michell Instruments Liquidew I.S. Manuale utente
97092 Issue 6
July 2022
Liquidew I.S.
Process Moisture Analyzer
User Manual
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© 2022 Michell Instruments
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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 6, July 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
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 Input/Output Signal .................................................................................................. 5
1.5 Sampling System ............................................................................................................ 5
2 INSTALLATION ............................................................................................................. 6
2.1 Unpacking the Analyzer ................................................................................................... 6
2.2 Environmental Requirements ........................................................................................... 7
2.3 Mounting ....................................................................................................................... 7
2.3.1 Control Unit Installation ............................................................................................. 7
2.3.2 Mounting the Liquidew I.S. Sensor Assembly into the Sampling System ........................ 9
2.3.3 Sampling System Installation ....................................................................................11
2.4 Wiring ...........................................................................................................................12
2.4.1 Overall Wiring Arrangement ......................................................................................12
2.4.2 Control Unit Wiring ..................................................................................................13
2.4.2.1 Power Supply Input Connection ..........................................................................14
2.4.2.2 Sensor Signal Input Connection ..........................................................................16
2.4.2.3 Analog Output Connection .................................................................................17
2.4.2.4 Alarm Output Connection ...................................................................................18
2.4.2.5 RS485 Port Connection ......................................................................................19
2.4.3 Sensor Assembly Wiring ...........................................................................................20
2.4.3.1 Dew-point Transmitter Wiring .............................................................................20
2.4.3.2 Temperature Transmitter Wiring .........................................................................23
3 OPERATION ............................................................................................................... 25
3.1 Preparation ...................................................................................................................25
3.2 Start-Up ........................................................................................................................25
3.2.1 Main Display ............................................................................................................25
3.2.2 Setup Menu .............................................................................................................26
3.3 Menu Structure ..............................................................................................................31
Liquidew I.S. User Manual
Michell Instruments v
Figures
Figure 1 Liquidew I.S. Control Unit .......................................................................................1
Figure 2 Structure of the Michell Ceramic Metal-Oxide Moisture Sensor ...................................3
Figure 3 Major Components of the Liquidew I.S. ...................................................................4
Figure 4 Dimensions of the Control Unit (in mm) ...................................................................7
Figure 5 Rack Mounting Method ...........................................................................................8
Figure 6 Liquidew I.S. Sensor Assembly ................................................................................9
Figure 7 Overall Wiring Arrangement ..................................................................................12
Figure 8 Control Unit Electrical Connections ........................................................................13
Figure 9 POWER INPUT Socket ..........................................................................................14
Figure 10 POWER INPUT Connector Block ............................................................................15
Figure 11 SENSOR INPUTS Connector Block .........................................................................16
Figure 12 ALARM Connector Block .......................................................................................18
Figure 13 Crimped Wires .....................................................................................................21
Figure 14 Cut to 5 mm ........................................................................................................21
Figure 15 Dew-Point Transmitter Housing ............................................................................21
Figure 16 Dew-Point Transmitter Pin Assignment Drawing......................................................22
Figure 17 Temperature Transmitter Housing Example ............................................................23
Figure 18 Temperature Transmitter Pin Assignment Drawing Example .....................................24
Figure 19 Menu Map ...........................................................................................................32
Figure 20 Dimensional Drawings (in mm) .............................................................................35
Appendices
Appendix A Technical Specications .........................................................................................34
A.1 Dimensional Drawings ............................................................................35
Appendix B Serial Communications ..........................................................................................37
Appendix C Hazardous Area Certication ..................................................................................49
C.1 Product Standards .................................................................................49
C.2 Product Certication...............................................................................49
C.3 Global Certicates/Approvals ..................................................................49
C.4 Terminal Parameters ..............................................................................50
C.5 Special Conditions ..................................................................................50
C.6 Maintenance and Installation ..................................................................50
Appendix D System Drawings ..................................................................................................52
D.1 Baseefa Approved System Drawing .........................................................52
D.2 QPS Approved System Drawing ...............................................................53
Appendix E Quality, Recycling & Warranty Information ..............................................................55
Appendix F Return Document & Decontamination Declaration ...................................................57
Liquidew I.S. User Manual
vi 97092 Issue 6, July 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 certicates. 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 specication.
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...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
Liquidew I.S. User 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 Liquidew I.S. 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 oer a variety of re-calibration and exchange transmitter schemes to suit
your specic 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 E.
Liquidew I.S. User Manual
viii 97092 Issue 6, July 2022
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 full 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-dened solutes and an ability to mix any 2 liquids from the list. Four alarm
relay contacts are provided which are user-congurable 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 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 6, July 2022
INTRODUCTION
1.1 Performance Features
• State-of-the-art ceramic metal-oxide 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 aected by pressure shocks.
• High integrity moisture in liquid measurement from 0.01ppmW to saturation
level at +20 °C (68 °F).
• Sample Analysis over temperature range 0...+50 °C maximum (32...122 °F)
• Three 4...20 mA outputs with congurable 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 certied traceable to NPL (UK) and NIST
(USA).
• Certied 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 and oxygen measurement at low
per-channel cost.
• Customized sampling systems to meet even the most demanding
applications.
1.2 Applications
• Naphtha feedstock to isomerization catalyst
• Hexane solvent in HDPE and LDPE process
• Benzene in styrene manufacture
• LNG LPG production and product checking
• Diesel and aero fuels to avoid liquid water phase separation
• BTX process monitoring – benzene, toluene and xylene
• Ethylene and propylene feed to polymer processes
• Butadiene and styrene for the manufacture of synthetic rubber
• Gas generation industries
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1
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