Michell Instruments SF52 Operating Manual
SF52
Dew-Point Transmitter
User’s Manual
97224 Issue 02, November 2011 Michell Instruments
Inside front cover (blank)
SF52 User’s Manual
SF52
© 2011 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.
97224 Issue 02, November 2011 iii Michell Instruments
SF52 User’s Manual
Contents
Safety .............................................................................................................................................. v
Electrical Safety ......................................................................................................................... v
Pressure Safety ......................................................................................................................... v
Toxic Materials .......................................................................................................................... v
Repair and Maintenance............................................................................................................. v
Calibration ................................................................................................................................ v
Abbreviations ....................................................................................................................................vi
Recycling Policy .................................................................................................................................vi
WEEE And RoHS Compliance ..............................................................................................................vi
Warranty .........................................................................................................................................vii
Return Policy ....................................................................................................................................vii
1 Introduction .............................................................................................................................. 1
1.1 Features ......................................................................................................................... 1
2 Preparation for use .................................................................................................................... 2
2.1 Electrical Connections ..................................................................................................... 2
2.2 Installation ..................................................................................................................... 2
3 OPERATION .............................................................................................................................. 3
Figures
Figure 2.1 Electrical Connections .................................................................................................. 2
Figure 4.1 Installation location ..................................................................................................... 3
Figure 4.2 Indication of dead space .............................................................................................. 3
Figure A1 Dimensions of the SF52 ............................................................................................... 6
Figure A2 Dimensions of the Sample Block ................................................................................... 6
Appendices
Appendix A Technical Specications ..................................................................................................5
A1 Dimensions ......................................................................................................6
Appendix B Recommended Practices in Humidity Measurements ......................................................... 8
Appendix C List of Worldwide Michell Instruments’ Ofces ............................................................... 13
97224 Issue 02, November 2011 iv Michell Instruments
SF52 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
specied safe working pressure is up to 20 bar (290 psi) maximum.
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 C for details of Michell Instruments’ worldwide ofces 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 Benelux BV,
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 specication.
Michell Instruments v 97224 Issue 02, November 2011
SF52 User’s Manual
Abbreviations
The following abbreviations are used in this manual:
bar pressure unit (=100 kP or 0.987 atm)
°C degrees Celsius
°F degrees Fahrenheit
DC direct current
Dp Dew point
g grams
g/m3 grams per cubic meter
gr/ft3 grains per cubic foot
m meter(s)
mA milliampere
mm millimetres
psi pounds per square inch
% percentage
oz ounces
RH relative humidity
V Volts
+ve positive
“ inches
‘ feet
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
directives’ 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
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SF52 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:
Notify a Michell Instruments’ representative, giving full details of the problem, the
model variant and the serial number of the product.
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.
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.
Michell Instruments vii 97224 Issue 02, November 2011
SF52 User’s Manual
1 Introduction
The SF52 dew-point transmitter from Michell Instruments can provide 4-20mA or voltage signal for either dew
point or absolute humidity with excellent accuracy and linearity.
The robust housing, together with an operating pressure of up to 20 bar (290 psi), makes the SF52 ideal for
many dew-point and moisture measurement applications.
1.1 Features
• Dew-point or absolute humidity outputs
• Current or voltage output signals
• Excellent linearity and temperature compensation
• IP65
• Excellent sensor protection
• Fast response
• Small size
• Digital recalibration (ask local distributor for more details)
Michell Instruments 1 97224 Issue 02, November 2011
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