PST Michell Instruments Liquidew I.S. Bedienungsanleitung
97092 Issue 5.3
September 2021
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Liquidew I.S.
Process Moisture Analyzer
User Manual
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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-Dened 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
Liquidew I.S. User Manual
vi 97092 Issue 5.3, September 2021
Appendices
Appendix A Technical Specications .........................................................................................47
A.1 Dimensional Drawings ............................................................................49
Appendix B Serial Communications ..........................................................................................51
Appendix C Modbus RTU Comms .............................................................................................56
Appendix D Hazardous Area Certication ..................................................................................59
D.1 Product Standards .................................................................................59
D.2 Product Certication...............................................................................59
D.3 Global Certicates/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 certicate.
Pressure Safety
DO NOT permit pressures greater than the safe working pressure, as dened in the published
specications, 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 oces 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 specic calibration interval (refer to www.michell.com for details of Michell
Instruments’ worldwide oces 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 Specications in
Appendix A.
Liquidew I.S. User Manual
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 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 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 aected 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 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 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
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