Michell Instruments Condumax II User manual

Condumax II
Hydrocarbon Dew-Point Analyzer
User’s Manual
97081 Issue 28.1
July 2018

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© 2018 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
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Condumax II
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Condumax II User’s Manual
iv 97081 Issue 28.1, July 2018
Contents
Safety ...............................................................................................................................vii
Electrical Safety .................................................................................................................vii
Pressure Safety .................................................................................................................vii
Toxic Materials...................................................................................................................vii
Repair and Maintenance.....................................................................................................vii
Calibration (factory validation) ...........................................................................................vii
Safety Conformity ..............................................................................................................vii
Abbreviations.................................................................................................................... viii
Warnings .......................................................................................................................... viii
1 INTRODUCTION ................................................................................................1
1.1 General .................................................................................................................. 1
1.2 System Description.................................................................................................. 1
1.2.1 Sample Gas Path........................................................................................... 1
1.2.2 Operating Overview....................................................................................... 3
1.2.3 Condumax II User Display and Interface......................................................... 3
1.2.4 Calibration.................................................................................................... 3
1.3 Condumax II Analyzer Storage Instructions............................................................... 4
2 INSTALLATION ..................................................................................................5
2.1 Electrical Safety ...................................................................................................... 5
2.1.1 Equipment Ratings and Installation Details...................................................... 5
2.2 Hazardous Area Safety ............................................................................................8
2.3 Pressure Safety....................................................................................................... 9
2.4 Lifting and Handling ................................................................................................9
2.5 Measurement System ............................................................................................ 10
2.5.1 Gas Connections, Sample Extraction & Conditioning ...................................... 11
2.5.2 Power Connection ...................................................................................... 15
2.5.3 Analog and Digital Communications ............................................................. 16
2.6 Condumax II Start-Up Purge Procedure .................................................................. 17
2.7 Sample Gas Flows ................................................................................................. 18
2.8 Sample Flow Alarms .............................................................................................. 19
3 OPERATION ....................................................................................................20
3.1 Timing Synchronization.......................................................................................... 20
3.2 Recovery Phase .................................................................................................... 20
3.3 Measurement Phase .............................................................................................. 20
3.3.1 Water Dew-Point Measurement .................................................................... 21
3.3.2 Signal Changes and Trip Point ...................................................................... 21
3.3.3 Sensitivity Calibration .................................................................................. 22
3.3.4 Adjustment of Measurement Sensitivity to User Defined Reference ................. 23
3.4 User Interface....................................................................................................... 24
3.4.1 Interface Controls ...................................................................................... 24
3.4.2 ‘Up/Down Arrow’ Buttons............................................................................. 24
3.4.3 ‘SELECT’ Button ......................................................................................... 25
3.4.4 ‘MENU/MAIN’ Button ................................................................................... 25
3.5 Menu Structure ..................................................................................................... 26
3.6 Main Page ............................................................................................................ 27
3.7 Menu Page ........................................................................................................... 27
3.8 Status Pages......................................................................................................... 28
3.8.1 Status Page 1 ............................................................................................. 28
3.8.2 Status Page 2 ............................................................................................. 29
3.9 Logging Menu Page............................................................................................... 30
3.9.1 Logged Data Page....................................................................................... 30
3.9.2 Statistics .................................................................................................... 31
3.9.3 Viewing Historical System Faults................................................................... 31

Condumax II User’s Manual
Michell Instruments v
3.10 Adjusting and Viewing System Variables ................................................................. 32
3.10.1 Enter Password........................................................................................... 32
3.10.2 Variable Pages ............................................................................................ 32
3.10.3 Variables Page 1 ......................................................................................... 33
3.10.4 Variables Page 2 ......................................................................................... 33
3.10.5 Variables Page 3 ......................................................................................... 33
3.10.6 Variables Page 4 ......................................................................................... 34
3.10.7 Variables Page 5 ......................................................................................... 34
3.11 Sensitivity Calibration ............................................................................................ 35
3.11.1 Executing the Sensitivity Calibration ............................................................. 35
3.11.2 Viewing the Calibration Data........................................................................ 35
3.12 Water Dew-Point Sensor Information...................................................................... 36
3.13 Contact/About Information .................................................................................... 36
4 MAINTENANCE ................................................................................................37
4.1 Calibration............................................................................................................ 37
4.2 Enclosure Cover and User Interface........................................................................ 38
4.3 Inspection/Cleaning of Hydrocarbon Sensor Cell Optical Surface............................... 39
4.4 Replacement of the Hydrocarbon Sensor Cell Assembly ........................................... 40
4.5 Replacement of the Water Dew-Point Sensor........................................................... 41
4.6 Troubleshooting .................................................................................................... 42
4.6.1 Error Messages ........................................................................................... 42
4.6.2 Logged Error Codes..................................................................................... 43
4.6.3 mA1 Output Analyzer Fault Alarm................................................................. 44
4.6.4 Heat-Pump Depression ................................................................................ 45
Figures
Figure 1 Power Connection Connector ........................................................................... 5
Figure 2 Earthing Stud And Nut Washer Assembly .......................................................... 6
Figure 3 Condumax Dimensions .................................................................................. 10
Figure 4 Flow Schematic............................................................................................. 11
Figure 5 Typical Phase Envelope for Northern Europe Natural Gas.................................. 14
Figure 6 Wiring Hook-Up Diagram ............................................................................... 15
Figure 7 Minimum Requirements for Start-Up Purging................................................... 18
Figure 8 Sensitivity Calibration Plot (Example) .............................................................. 23
Figure 9 User Interface............................................................................................... 24
Figure 10 ‘UP/DOWN ARROW’ Buttons........................................................................... 24
Figure 11 ‘SELECT’ Button ............................................................................................ 25
Figure 12 ‘MENU/MAIN’ Button ..................................................................................... 25
Figure 13 Menu Structure ............................................................................................. 26
Figure 14 MAIN Page With Wdp Sensor Fitted................................................................ 27
Figure 15 MAIN Page Without Wdp Sensor Fitted ........................................................... 27
Figure 16 MENU Page................................................................................................... 27
Figure 17 STATUS Page 1 ............................................................................................. 28
Figure 18 STATUS Page 2 ............................................................................................. 29
Figure 19 LOGGED DATA Page ...................................................................................... 30
Figure 20 STATISTICS Page .......................................................................................... 31
Figure 21 Logged Error Codes....................................................................................... 31
Figure 22 Password Page.............................................................................................. 32
Figure 23 Variables Page .............................................................................................. 32
Figure 24 Sensitivity Calibration Page ............................................................................ 35
Figure 25 Sensitivity Calibration Data Page .................................................................... 35
Figure 26 Water Dew-Point Sensor Information Page...................................................... 36
Figure 27 Contact/About Information Page .................................................................... 36
Figure 28 Logged Error Codes....................................................................................... 43
Figure 29 Reading Holding Registers State Diagram........................................................ 68
Figure 30 Write Single Register State Diagram ............................................................... 70

Condumax II User’s Manual
vi 97081 Issue 28.1, July 2018
Appendices
Appendix A Technical Specifications.............................................................................. 47
A.1 Mounting Drawing....................................................................... 48
A.2 Flow Diagram ............................................................................. 49
A.3 Wiring Hook-Up Diagram ............................................................. 50
Appendix B Modbus RTU Communications ....................................................................52
B.1 Introduction ............................................................................... 52
B.2 Modbus RTU Basics..................................................................... 52
B.3 Modbus RTU Basics..................................................................... 52
B.4 Register Map .............................................................................. 53
Appendix C Software................................................................................................... 57
C.1 System Requirements.................................................................. 57
Appendix D Variables Pages ......................................................................................... 59
D.1 Variables Page 1 ......................................................................... 59
D.2 Variables Page 2 ......................................................................... 61
D.3 Variables Page 3 ......................................................................... 62
D.4 Variables Page 4 ......................................................................... 63
D.5 Variables Page 5 ......................................................................... 65
Appendix E Modbus RTU Details ..................................................................................67
E.1 Message Framing ........................................................................ 67
E.2 Implemented Functions ............................................................... 68
E.3 Exceptions.................................................................................. 72
Appendix F Number Formats ....................................................................................... 74
Appendix G Hazardous Area Certification ...................................................................... 80
G.1 Product Standards....................................................................... 80
G.2 Product Certification .................................................................... 80
G.3 Global Certificates/Approvals........................................................ 80
G.4 Special Conditions of Use............................................................. 81
G.5 Maintenance and Installation ....................................................... 81
Appendix H Quality, Recycling, Compliance & Warranty Information................................ 83
Appendix I Analyzer Return Document & Decontamination Declaration ..........................85

Condumax II User’s Manual
Michell Instruments vii
Safety
This manual contains all the required information to install, operate and maintain the Condumax II.
Prior to installation and use of this instrument, this entire manual should be read and understood.
Installation and operation of this product should be carried out by suitably competent personnel only.
The operation of this product must be in accordance with the terms of this manual and associated
safety certificates. Incorrect installation and use of this product for other than its intended purpose
will render all warranties void.
This product is intended for use in a Hazardous Area and is awarded an ATEX, IECEx and CSA
Certificate. The relevant certificates should be fully examined prior to installation or use of this
product.
!
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.
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 limits are 90 to
260 V AC, 47/63 Hz.
Pressure Safety
DO NOT permit pressures greater than the safe working pressure to be applied directly to the
instrument. Refer to the Technical Specifications in Appendix A.
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 only be maintained either by the manufacturer or an accredited service agent.
Refer to www.michell.com for details of Michell Instruments’ worldwide offices contact information.
Calibration (factory validation)
Prior to shipment, both the hydrocarbon dew-point cell and the water dew-point cell undergo
stringent factory calibration to internationally traceable standards - NPL (UK) and NIST (USA). Due
to the inherent stability of the instruments, only periodic calibration maintenance is required under
normal operating conditions. Refer to Section 1.2.4 and 4.1 for more information.
Safety Conformity
This product meets the essential protection requirements of the relevant EU directives. Further
details of applied standards may be found in the product specification.

Condumax II User’s Manual
viii 97081 Issue 28.1, July 2018
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
°C degrees Celsius
°F degrees Fahrenheit
DC direct current
dp dew point
EU European Union
g/m3 grams per cubic meter
HCdp hydrocarbon dew point
IEC International Electrotechnical Commission
kg kilogram
lb pound
lbs/mmscf pounds of water per million standard cubic feet of gas
m meter(s)
mA milliampere
max maximum
mg/m3 milligrams per cubic meter
mm millimeters
mV millivolts
Nl/min normal liters per minute
Nm3/hr normal cubic meters per hour
% percentage
ppmVparts per million by volume
psig pounds per square inch
RS232 serial data transmission standard
RS485 serial data transmission standard
RTU Remote Terminal Unit
scfh standard cubic feet per hour
temp temperature
V Volts
W Watts
Wdp water dew point
ΩOhms
“ inch(es)
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.

Condumax II User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
1.1 General
The Condumax II is designed for continuous, automatic measurement of the hydrocarbon
dew point and water dew point of processed natural gas. It is the result of more than 30
years' experience in the supply of analyzers to the worldwide oil, gas and petrochemical
industry.
The system consists of a hydrocarbon dew-point measurement sensor cell and control
electronics housed in an Exd enclosure. An optional water dew-point measurement
sensor can be accommodated, either at the time of build or as a retro-fit option. A
sample gas handling panel to prepare the gas sample prior to entry into the Condumax
II can also be supplied. The analyzer is designed to be positioned close to the process
sample point and is ATEX Directive, IECEx or cCSAus compliant for use in a Zone 1 or
2 Hazardous Area and Class I, Div 1 Hazardous Location. See marking label located on
right hand side of analyzer to identify approvals.
The unique measurement principle of the Condumax II involves detecting the formation
of hydrocarbon condensate through a highly sensitive secondary optical effect.
A reduction in scattered light intensity is observed when a well-collimated incident
light beam is reflected from a shallow, abraded, conical depression by hydrocarbon
condensate forming on the measurement surface. This measurement surface is referred
to as the Optical Surface (see Section 3.8.1). The cooling of the measurement surface
is achieved using a Peltier effect (thermo-electric) heat pump. The use of this device
enables measurements to be made down to more than 50°C below the operating
temperature of the analyzer.
The Condumax II operates on a periodic measurement cycle basis. The sample flow is
continuous until, at the start of a measuring cycle, the flow is interrupted, trapping a
sample of gas within the sensor cell until the dew point is measured.
This technique of analyzing a fixed volume sample successfully de-couples thermal
mass transfer and flow effects on the observed dew point ensuring that repeatable
measurements are made to a constant level of measurement sensitivity.
1.2 System Description
The requirements for operation are a 90 to 260 V AC, 47/63 Hz power supply of 125 W
and field communications; Modbus RTU and/or 4-20 mA. Refer to the ‘Wiring Hook-Up
Diagram’ in Appendix A.3.
1.2.1 Sample Gas Path
The Condumax II measurement system must be supplied with gas at the required
pressure via a sample gas handling panel. The hydrocarbon dew-point stream is always
included as part of the system and, as an additional option, the water dew-point stream
can be fitted. Sample gas entry and exit ports pass the gas through flame arrestors
which provide the explosion proof protection.

Condumax II User’s Manual
297081 Issue 28.1, July 2018
INTRODUCTION
The measurement system components are housed within a cast aluminum EExd rated
enclosure. The enclosure has a screw cover incorporating a sealed window. It is
chromate primed, polyester coated in black, and provides environmental protection to
IP66/NEMA 4. An enclosure breather is fitted in the form of an additional flame arrestor.
It is important that no pipe connection is made to this breather and that no restriction
is allowed to occur.
All sample wetted metallic parts are manufactured in AISI 316L stainless steel with
Viton soft parts that comply with the NACE standard MR-01-75 (latest edition). Tube
fittings are twin ferrule compression type. All electrical and gas connections are made
through the base of the enclosure. Refer to the Mounting Drawing in Appendix A.1.
The hydrocarbon dew-point flow components are as follows (refer to the ‘Flow Diagram’
in Appendix A.2):
• Flow Switch 1
Provides indication that a flow is present throughout the hydrocarbon
dew-point measurement stream.
• Hydrocarbon Dew-point Sensor Cell
Provides the measurement of hydrocarbon dew point within the sample
gas.
• Pressure Transmitter 1
Provides the measurement of the sample gas pressure within the
hydrocarbon dew-point measurement cell.
• Solenoid Valve
Enables sample gas shut off to provide fixed volume measurement.
The water dew-point flow components are as follows:
• Flow Switch 2
Provides indication that a flow is present throughout the water dew-point
measurement stream.
• Pressure Transmitter 2
Provides the measurement of the sample gas pressure within the water
dew-point measurement cell.

Condumax II User’s Manual
Michell Instruments 3
INTRODUCTION
1.2.2 Operating Overview
At the beginning of a measurement cycle, the sample solenoid valve is closed to trap a
gas sample in the hydrocarbon sensor cell for analysis and the controlled cooling of the
optical surface commences. When the scattered light intensity, measured by the optical
measurement system, reaches a user-set trip point, the temperature of the optical
surface is recorded as the hydrocarbon dew point. After this, the sample gas flow is
restored and the optical surface is heated to the temperature set-point. The heating of
the optical surface to an elevated temperature ensures that any hydrocarbon residue is
released from the optical surface before the next measurement cycle.
This measurement process is repeated cyclically at intervals determined by the control
system and pre-set by the operator. The minimum cycle time is 10 minutes and under
ideal conditions, when the condensate formed is sufficiently volatile to evaporate the
residue, the recovery phase will be approximately 8 minutes. However, in applications
where relatively high hydrocarbon dew points occur (within 10°C of saturation at the
sampling system temperature) then longer cycle times may be required in order to
avoid residue build-up on the optical surface.
The measurement of the water dew point is continuous and the gas sample flow is
uninterrupted.
The measured hydrocarbon and water dew-point temperature, pressure, date and
time are stored and indexed in the memory, with the most recent reading logged as
number 1. The temperature and pressure readings are available via both the digital
and analog communications. The date and time are only available through digital
communication.
1.2.3 Condumax II User Display and Interface
The Condumax II User Display and Interface Unit is presented via the circular window
of the enclosure. Operation is achieved by a unique system which allows full control
through the glass of the enclosure cover. The cover is fully detachable for greater
access into the enclosure during the installation and initial set-up of the instrument.
During normal operation of the instrument the cover must remain fully secured.
1.2.4 Calibration
The Condumax II is factory-tested and calibrated prior to delivery. Certification is provided
for the hydrocarbon dew-point sensor and the optional water dew-point sensor, if fitted.
The hydrocarbon dew-point sensor is calibrated at three points across its operating range
using a certified gas mixture of 10% (mol) n-butane in pure nitrogen. The calibration gas
is a gravimetric mixture produced using weights traceable to National Physical Laboratory
(NPL). Calculation of the relationship between calibration gas pressure and hydrocarbon
(n-butane) dew-point temperature is determined using the Peng/Robinson equation of
state. The sensor is also performance tested against samples of synthetic natural gas,
to confirm the correct optical response to multiple condensable components. These
speciality gas mixtures are analyzed by a UKAS accredited laboratory in accordance with
BS EN ISO 17025.
The water dew-point sensor is supplied with its own Calibration Certificate, providing
direct traceability to both UK (NPL) and US (NIST) Humidity Standards. The sensor is
certified at 7 dew-point levels across its operating range against a certified reference
hygrometer, using a mass-flow humidity generator system as a source of reference
calibration gas (refer to Section 4.1 for details on calibration maintenance).

Condumax II User’s Manual
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INTRODUCTION
1.3 Condumax II Analyzer Storage Instructions
The Condumax analyzer has been designed for the accurate measurement of hydrocarbon
and water dew point within natural gas. In order for the analyzer to be functional upon
installation it should be stored in accordance with the guidelines below:
• The analyzer must be housed in a sheltered area, out of direct sunlight
and rain.
• The analyzer should be stored to minimize the possibility of sitting in
ground water.
• The temperature within the storage environment should be maintained
between 0 and +50°C (+32 and +122°F).
• The humidity within the storage environment must be non-condensing.
• The storage environment must not expose the analyzer to any corrosive
elements.
• The analyzer may stay assembled with its sample conditioning system (if
supplied).
• All electrical and process connections should remain disconnected.
• All protective coatings should remain in place until installation.
• For prolonged periods of storage, the lid of the packaging crate should be
removed to allow air to circulate.
• The documentation supplied with the analyzer should be removed from
the packaging crate and stored elsewhere to protect its integrity.
For the period from installation of the Condumax II analyzer to commissioning start-up,
the following precautions should be followed:
• The analyzer and associated sampling system must remain isolated from
the process gas, and the enclosure should remain closed to ensure ingress
protection is maintained.
• The sampling system enclosure heating/thermostat circuit should be
operated if the climatic temperature might fall below 0°C (+32°F).
• At time of start-up the procedures contained in the User Manuals for both
analyzer and sampling system must be followed.
If the Condumax analyzer was previously in service/operation then the following
precautions should be followed before storage:
• Upon isolation from the gas sample the entire system should be purged
with a dry nitrogen gas before powering down of the analyzer.
• All connections and ports (gas and electrical) to the analyzer or sample
system (if provided) should be capped.
• If the analyzer is not removed from its location, the electrical grounding
of the analyzer should remain in place.

Condumax II User’s Manual
Michell Instruments 5
INSTALLATION
2 INSTALLATION
2.1 Electrical Safety
!
WARNING:
During the installation of this product ensure that all
applicable national and local electrical safety regulations
are observed.
WARNING:
Isolate the power prior to installation.
WARNING:
Always ensure that power is switched off prior to accessing
the product for any purpose other than normal operation or
prior to disconnecting any cables.
2.1.1 Equipment Ratings and Installation Details
The following mandatory statements refer to the Ex certified Condumax Analyzer only
(not including the sampling system).
This equipment must be supplied with a voltage between the range of 90 to 260 V AC,
47/63 Hz. Maximum power rating is 125 W.
The power is connected via PL1 on the mains connector PCB.
Figure 1 Power Connection Connector
All input and output connectors are 2-part PCB mounted type, rated at 300 V 10 A.
The detachable, screw terminal half of each connector is designed to accept 0.5 to
2.5mm2[24 -12 AWG] stranded or solid conductors.

Condumax II User’s Manual
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INSTALLATION
Any power connection cable should be 3 core over sleeved, with minimum 0.5mm
insulation and rated at 300 V. Cables should have Live (L), Neutral (N) and Earth
[Ground] (E) conductors. Ensure suitably rated power supply cables and glands are
used to ensure that electrical safety is maintained. Connect each of the Live (L), Neutral
(N) and Earth [Ground] (E) conductors to the similarly marked terminals (L, N, E) on the
Power In connector shown in Figure 1. Ensure the power supply can deliver sufficient
power consumption requirement.
Any power supply terminals and voltages must be suitably separated from the other I/O
requirements of this product.
Before applying power, perform a continuity test to ensure that the power supply cable
and product are effectively connected to the protective Earth.
The Protective Earth terminal is mounted internally and the Earth wire connected to it
should never be disconnected. The product enclosure is supplied with an external earth
stud at the lower right hand side. At installation, connect this earth stud to plant earth
by a minimum 4mm2earthing bonding. M6 stud and 2 off M6 nuts and washers, all
nickel plated.
Figure 2 Earthing Stud And Nut Washer Assembly
Fuse: A replacement fuse can be obtained by contacting Michell Instruments' technical
support. Fuse rating = 5 x 20mm 2.5 A anti-surge to IEC 60127-2.
This product is designed to operate, as a minimum, between a temperature range of -40
to +60°C, in maximum 80% relative humidity for temperatures up to +31°C decreasing
linearly to 50% RH at +50°C. Supply voltages of ±10% and transient over voltages
up to Overvoltage Category II. Pollution Degree 2. Altitudes up to 2000m. Outdoor
mounting is permitted using suitably rated glands equivalent to NEMA 4 / IP66. See
Appendix A, Technical Specification for full operating parameters.
Do not remove or exchange any of the cables or electrical components supplied with
this product. Doing so will invalidate all warranties.
There are no additional or special electrical safety requirements other than those
referred to in this manual.

Condumax II User’s Manual
Michell Instruments 7
INSTALLATION
Location and mounting arrangements - refer to the relevant sections of this manual for
the location and mounting details.
Installation of this equipment must include the provision of a suitable and locally
positioned power isolation switch or circuit breaker. Indication of the purpose of the
switch or circuit breaker is strongly recommended. An over-current protection device
should be rated to a maximum of 10 A.
This equipment and all power isolation devices must be installed in a location and
position that allows safe and easy access to their operation and is able to rigidly support
the equipment.
Do not install this equipment in a location that would expose it to impact or high levels
of vibration.
Operation of this equipment, other than in a manner specified by the manufacturer, may
impair the safety protections provided.
The safe installation of this equipment and any system incorporating this equipment is
the responsibility of the installer. Ensure local regulations and requirements are referred
to prior to any installation commencing.

Condumax II User’s Manual
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INSTALLATION
2.2 Hazardous Area Safety
Refer to Appendix G for the Hazardous Area Certification of this product.
This product is fitted with a marking label that contains Hazardous Area information
pertinent to the suitable location and installation.
During all installation and operation activities, local regulations and permitted working
routines must be observed. Installation should only be performed by competent personnel
and in accordance with the latest version of IEC/EN60079-14 or local equivalent.
Repair and servicing of this equipment must only be carried out by the manufacturer.
An Installation and Maintenance Information Sheet is supplied separately to the manual.
WARNING:
This product is certified safe for use in a Zone 1 and Zone 2
area only. This product must not be installed or used within
a Zone 0 area.
!
WARNING:
This product must not be operated within an explosive
atmosphere greater than 1.1 bara.
WARNING:
This product must not be operated with enriched oxygen
gas samples (more than 21% oxygen content).
WARNING:
This product must not be operated outside of the
temperature range of -40 to +59°C (-40 to +138°F).
WARNING:
The enclosure of this product provides Exd protection, partly
through the threads used for mounting the lid, stopping
plugs and cable gland. At all times effort should be made to
ensure these threads are suitably protected from damage
and that only appropriately rated mating parts are applied
to them, in accordance with the certifying requirements.

Condumax II User’s Manual
Michell Instruments 9
INSTALLATION
2.3 Pressure Safety
!
WARNING:
This product is used in conjunction with pressurized gases.
Observe pressurized gas handling precautions.
!
WARNING:
Pressurized gas is dangerous.
Pressurized gas should only handled by suitably trained personnel.
This product requires pressurized gas to be connected to it. Observe pressurized gas
handling regulations. Only suitably trained personnel should carry out tasks that include
the use of pressurized gas mediums.
2.4 Lifting and Handling
!
WARNING:
This instrument is in excess of 18kg (40lbs).
Personnel must observe suitable lifting and handling precautions.
This product is not designed as portable or transportable equipment. It should be rigidly
fixed in position as per the full installation instructions.
The weight of the analyzer is in excess of 18kg (40lbs). Therefore, appropriate lifting and
handling techniques should be used during the installation process. Before commencing
any lifting or handling ensure that its intended location is suitable and appropriately
prepared. Make sure that mounting point design considerations have employed locally
approved safety factors.
When handling and installing this product (particularly after removal from its packaging)
ensure that it is not dropped, impacted or subjected to high levels of vibration or
environmental conditions that may impair its operation.

Condumax II User’s Manual
10 97081 Issue 28.1, July 2018
INSTALLATION
2.5 Measurement System
Refer to the Installation & Maintenance Information sheet (supplied separately) and the
System Drawings in Appendix A.
The instrument is housed in an aluminum EExd enclosure suitable for wall or panel
mounting. Four mounting points are available with M12 clearance holes on fixing centres
of X = 270mm (10.62") x Y = 318mm (12.51").
The dimensions of the enclosure are:
Height: 355mm (13.9”), 500mm (19.68”) including installation clearance
Width: 310mm (12.20”), 500mm (19.68”) including installation clearance
Depth: 245mm (9.64”)
The enclosure provides environmental ingress protection IP66/NEMA 4 and should be
mounted vertically in a location free of any appreciable vibration. It should be placed in
a shaded position to prevent heating effects through sun radiation.
The weight of the analyzer is 25kg (55lbs).
270mm 10.63"
318mm 12.52"
245mm 9.65"
290mm [11.41"]
4 off M12 (1/2")
Clearance
Enclosure Breather
Flame Arrestor
Do NOT obscure
Hydrocarbon Dew-Point Channel
Flame Arrestor
Water Dew-Point Channel
Flame Arrestor
Water Dew-Point Channel
Flame Arrestor
Hydrocarbon Dew-Point Channel
Flame Arrestor
310mm [12.20"]
Cable Entry Glands
3 off M20 (ATEX)
3 off M20 -> 1/2" NPT Thread Adaptor (CSA)
1/8" NPT Female (ATEX/IECEx/CSA)
1/8" NPT Female (ATEX/IECEx/CSA)
1/8" NPT Female (ATEX/IECEx/CSA)
1/8" NPT Female (ATEX/IECEx/CSA)
Figure 3 Condumax Dimensions

Condumax II User’s Manual
Michell Instruments 11
INSTALLATION
2.5.1 Gas Connections, Sample Extraction & Conditioning
MICHELL WATER
DEW-POINT SENSOR PRESSURE
TRANSMITTER 2
GAS SAMPLING BLOCK
PRESSURE
TRANSMITTER 1 SOLENOID VALVE
HYDROCARBON
DEW-POINT
SENSOR CELL
FLOW
SWITCH 1
FLOW
SWITCH 2
FLAME
ARRESTORS
GAS IN
MAX
100 barg
(1450 psig)
GAS IN
MAX
138 barg
(2000 psig)
ENCLOSURE BREATHER
(DO NOT OBSTRUCT) FLAME
ARRESTORS
GAS OUT GAS OUT
Figure 4 Flow Schematic
NOTE: Ensure that the process sample gas supply line is well flushed through
to clear any liquids and debris present prior to connection to the instrument. A
sample handling system must prepare the gas in terms of pressure regulation
and filtration before entering into the measurement system.
In accordance with the certification requirements for safe
operation of this product, the Condumax II must have, as a
minimum, those components described in Section 2.7 and
positioned as shown in Appendix A.1.
The pipe work connections are as follows:
Hydrocarbon gas sample inlet
(Maximum pressure of 100 barg (1450 psig))
1/8" NPT Female
(ATEX/IECEx/
CSA)
Hydrocarbon gas sample outlet
(Vent to atmosphere or low pressure flare line)
Water dew-point gas inlet
(Maximum pressure of 138 barg (2000 psig))
Water dew-point gas outlet
(Vent to atmosphere or low pressure flare line)

Condumax II User’s Manual
12 97081 Issue 28.1, July 2018
INSTALLATION
The following points should be considered when installing the sample gas supply line:
PTFE tape is recommended for pipe connections. Solvent based pipe thread sealant
should not be used, as condensable components or contaminates can be leached during
the curing period.
It is recommended that Viton is used for all O-rings.
Care and attention to the position and installation of the piping will minimize problems
caused by avoidable contamination of the measurement system. The most common
cause of difficulty is the accumulation of liquid in impulse lines during a shutdown
period. If the measurement system has not been isolated on restart-up, condensate
can be displaced into components and associated pipe work within the measurement
system.
If this event follows a period when process lines may have been contaminated by non-
hydrocarbons e.g. glycol, corrosion inhibitors etc., the problem is magnified. Similarly,
difficulty will be encountered in sample gases carrying liquids, including hydrocarbon
liquids.
Our recommendations are:
• The sampling point on the process line should be on the top of the pipe.
If a radial probe is used the orifice should face downstream.
• The internal volume of the impulse tubing between the process line and
any sampling system should be as low as possible to minimize response
lag time to changing process conditions.
• Piping should be lagged and/or trace heated if ambient temperatures
could cause the sample gas to fall below its dew-point temperature.
• A drain valve should be placed at the low point (if any) in the system.
• It should be standard procedure to isolate the measurement system
during shutdowns or when plant problems are being experienced and to
properly purge the supply lines before restarting.
• The relatively large area of surfaces and internal volume of pressure
regulators can be particularly troublesome if contamination is experienced.
Prolonged purging with gas may be necessary to remove the contamination.
Stripping and cleaning followed by purging of the system is preferred.
• Avoid sample gas streams that are already very close to the dew point
or which have dispersed liquid (not necessarily hydrocarbon) burden. In
such cases, sampling from fast loops and/or from downstream of existing
catch pot/coalesce systems is always preferred.
Failure to observe these recommendations will potentially cause problems of
contamination as well as causing consequential inaccurate, unreliable and inconsistent
monitoring. If a top-entry sample point is not available, extra attention should be given
to the design of the sample line installation to avoid unwanted contamination.