Michell Instruments Pura Operating Manual
Pura
Hazardous Area Transmitter 2-wire
User’s Manual
97306 Issue 1.1, March 2016
Michell Instruments
Inside front cover (blank)
Pura Hazardous Area Transmitter 2-Wire User’s Manual
I.S.
Pura Hazardous Area Transmitter
© 2007-2012 Michell Instruments
This document is the property of Michell Instruments Ltd. and may not be copied or otherwise reproduced,
communicated in any way to third parties, nor stored in any Data Processing System without the express
written authorization of Michell Instruments Ltd.
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Pura Hazardous Area Transmitter 2-Wire User’s Manual
Contents
Safety ..............................................................................................................................................vi
Electrical Safety .........................................................................................................................vi
Pressure Safety .........................................................................................................................vi
Toxic Materials ..........................................................................................................................vi
Repair and Maintenance.............................................................................................................vi
Calibration ................................................................................................................................vi
Safety Conformity ......................................................................................................................vi
EC Declaration of Conformity.............................................................................................................vii
Abbreviations .................................................................................................................................. viii
Warnings ........................................................................................................................................ viii
Recycling Policy .................................................................................................................................ix
WEEE And RoHS Compliance ..............................................................................................................ix
Calibration Facilities ...........................................................................................................................ix
Manufacturing Quality ........................................................................................................................ix
Warranty .......................................................................................................................................... x
Return Policy ..................................................................................................................................... x
1 INTRODUCTION ........................................................................................................................ 1
2 DESCRIPTION ........................................................................................................................... 1
3 PREPARATION FOR USE ............................................................................................................. 2
4 SENSOR INSTALLATION ............................................................................................................. 3
4.1 Installing the Sensor ....................................................................................................... 3
4.2 Pura Transmitter (Sensor Only Version) Installation ........................................................... 4
4.3 Transmitter Cable .......................................................................................................... 6
4.4 Preparation of the Sensor Cable ....................................................................................... 7
4.5 Installation in Hazardous Areas ........................................................................................ 9
5 WHICH GASES TO MEASURE? .................................................................................................... 9
6 MAINTENANCE .......................................................................................................................... 9
7 FAULT CONDITIONS .................................................................................................................10
7.1 Sampling Hints ..............................................................................................................10
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Pura Hazardous Area Transmitter 2-Wire User’s Manual
Figures
Figure 4.1 Pura Premium & Pura OEM Dimensional Drawings ....................................................3
Figure 4.2 Pura Sensor Dimensional Drawing ...........................................................................5
Figure 4.3 Terminal block Removal ..........................................................................................6
Figure 4.4 Bare wires .............................................................................................................7
Figure 4.5
Figure 4.6 Cut to 5mm ...........................................................................................................7
Figure 4.7 Connection to Pura I.S.TX ......................................................................................7
Figure 4.8 Rear of connector terminal block .............................................................................8
Figure 4.9 Electrical Connections ............................................................................................8
Figure 7.1 Installation location .............................................................................................. 10
Figure 7.2 Indication of dead space ......................................................................................10
Crimped wires .......................................................................................................7
Appendices
Appendix A Technical Specifi cations ......................................................................................... 12
Appendix B Hazardous Area Certifi cation .................................................................................. 14
B1 Terminal Parameters ................................................................................. 14
B2 Special Conditions of Use .......................................................................... 14
Appendix C System Drawings .................................................................................................. 16
C1 Baseefa Approved System Drawing ............................................................ 16
C2 FM Approved System Drawing ................................................................... 17
C3 CSA Approved System Drawing .................................................................. 18
Appendix D List of Worldwide Michell Instruments’ Offi ces ......................................................... 20
Michell Instruments v 97306 Issue 1.1, March 2016
Pura Hazardous Area Transmitter 2-Wire User’s Manual
Safety
The manufacturer has designed this equipment to be safe when operated using the procedures detailed in this
manual. The user must not use this equipment for any other purpose than that stated. Do not apply values
greater than the maximum value stated.
This manual contains operating and safety instructions, which must be followed to ensure the safe operation
and to maintain the equipment in a safe condition. The safety instructions are either warnings or cautions
issued to protect the user and the equipment from injury or damage. Use competent personnel using good
engineering practice for all procedures in this Manual.
Electrical Safety
The instrument is designed to be completely safe when used with options and accessories supplied by the
manufacturer for use with the instrument.
Pressure Safety
DO NOT permit pressures greater than the safe working pressure to be applied to the instrument. The
specifi ed safe working pressure is 24 MPa (240 barg / 3480 psig).
Toxic Materials
The use of hazardous materials in the construction of this instrument has been minimized. During normal
operation it is not possible for the user to come into contact with any hazardous substance which might be
employed in the construction of the instrument. Care should, however, be exercised during maintenance and
the disposal of certain parts.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. Refer to
Appendix D for details of Michell Instruments’ worldwide offi ces’ contact information.
Calibration
The recommended calibration interval for this instrument is 12 months unless it is to be used in a missioncritical application or in a dirty or contaminated environment in which case the calibration interval should be
reduced accordingly. The instrument should be returned to the manufacturer, Michell Instruments Ltd., or one
of their accredited service agents for re-calibration.
Safety Conformity
This product meets the essential protection requirements of the relevant EU directives. Further details of
applied standards may be found in the product specifi cation.
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Pura Hazardous Area Transmitter 2-Wire User’s Manual
EU Declaration of Conformity
NOTE: The PURA I.S. product incorporates the ATEX/IECEx/CSA/FM approved Easidew I.S.
product and it is the Hazardous Area Certifi cation for the Easidew I.S. that provides the necessary
approvals for the PURA I.S.
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Abbreviations
The following abbreviations are used in this Manual:
AC alternating current
atm pressure unit (atmosphere)
barg pressure unit (=100 kP or 0.987 atm)
ºC degrees Celsius
ºF degrees Fahrenheit
DC direct current
ft foot (feet)
g gram(s)
Hz Hertz
“ inch(es)
kg kilogram(s)
lb pound
Nl/min normal liters per minute
m meter(s)
mA milliampere
max maximum
min minute(s)
mm millimeter(s)
MPa megapascal (Pascals x106)
m/sec meters per second
Nm Newton meter
ppmV parts per million (by volume)
RS232 serial data transmission standard
Rx receive
scfh standard cubic feet per hour
scfs standard cubic feet per second
sec second(s)
temp temperature
Tx transmit
V Volts
Ω Ohms
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.
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Pura Hazardous Area Transmitter 2-Wire User’s Manual
Recycling Policy
Michell Instruments is concerned with the protection of the environment. It is our commitment to reduce
and eliminate from our operations, wherever possible, the use of substances which may be harmful to the
environment. Similarly, we are increasingly using recyclable and/or recycled material in our business and
products wherever it is practical to do so.
The product that you have purchased may contain recyclable and/or recycled parts and we will be happy to
provide you with information on these components if required.
WEEE And RoHS Compliance
The Waste Electronic and Electrical Equipment (WEEE) Directive, and the Restriction of Hazardous Substances
(RoHS) Directive place rules upon European manufacturers of electrical and electronic equipment. The
directive’s aim is to reduce the impact that electronic devices have on the environment.
Michell products are currently exempt from the RoHS directive, however all future products will be developed
entirely using compliant materials. Furthermore, Michell is taking active steps to remove non-compliant
materials and components from existing products wherever possible.
Michell is in full compliance with the WEEE Directive (Registration No. WEE/JB0235YW). Customers may be
required to return certain instruments for treatment at the end of their working life.
June 2010
Calibration Facilities
Michell Instruments’ calibration facilities are among the most sophisticated in the world and have been
recognized for their excellence.
Traceability to the National Physical Laboratory (NPL) UK is achieved through our UKAS Accreditation
(Number 0179). This covers dew point over the range -90 to +90°C (-130 to +194°F) and also Relative
Humidity.
Dew-point calibrations are also traceable to the National Institute for Standards & Technology (NIST) USA over
the range -75 to +20°C (-103 to +68°F).
NOTE: Standard traceable calibration certifi cates for instruments and sensors are not issued
under our UKAS accreditation. UKAS certifi cates are usually to special order and are clearly
identifi ed.
Manufacturing Quality
Michell Instruments is registered with the British Standards Institute for Quality Assurance to:
BS EN ISO 9001: 2008
Rigorous procedures are performed at every stage of production to ensure that the materials of construction,
manufacturing, calibration and fi nal test procedures meet the requirements laid down by our BSI approved
Quality System.
Please contact Michell Instruments if the product does not arrive in perfect working order.
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Pura Hazardous Area Transmitter 2-Wire User’s Manual
Warranty
Unless otherwise agreed, the Supplier warrants that, as from the date of delivery for a period of 12 months,
the goods and all their component parts, where applicable, are free from any defects in design, workmanship,
construction or materials.
The Supplier warrants that the services undertaken shall be performed using reasonable skill and care, and of
a quality conforming to generally accepted industry standards and practices.
Except as expressly stated all warranties, whether express or implied, by operation of law or otherwise, are
hereby excluded in relation to the goods and services to be provided by the Supplier.
All warranty services are provided on a return to base basis. Any transportation costs for the return of a
warranty claim shall reside with the Customer.
Return Policy
If a Michell Instruments’ product malfunctions within the warranty period, the following procedure must be
completed:
1. Notify a Michell Instruments’ representative, giving full details of the problem,
the model variant and the serial number of the product.
2. If the nature of the problem indicates the need for factory service then the
instrument should be returned to Michell Instruments, carriage prepaid,
preferably in the original packaging, with a full description of the fault
and the customer contact information.
3. Upon receipt, Michell Instruments will evaluate the product to determine the
cause of the malfunction. Then, one of the following courses of action will
be taken:
• If the fault is covered under the terms of the warranty, the
instrument will be repaired at no cost to the owner and returned.
• If Michell Instruments determines that the fault is not covered
under the terms of the warranty, or if the warranty has expired,
an estimate for the cost of the repairs, at standard rates, will be
provided. Upon receipt of the owner’s approval to proceed, the
product will be repaired and returned.
97306 Issue 1.1, March 2016 x Michell Instruments
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