Michell Instruments SF52 Manuale utente
SF52
Dew-Point Transmitter
User’s Manual
97224 Issue 5
June 2017
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© 2015 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.
SF52 Transmitter
For Michell Instruments' contact information please go to
www.michell.com
SF52 User’s Manual
iv 97224 Issue 5, June 2017
1 INTRODUCTION................................................................................................1
1.1 Features ............................................................................................................ 1
2 INSTALLATION ..................................................................................................2
2.1 Unpacking the Instrument................................................................................... 2
2.2 Electrical Schematic............................................................................................ 3
2.2.1 Electrical Boundaries mA 3-Wire..................................................................... 3
2.3 Transmitter Mounting.......................................................................................... 4
2.3.1 Transmitter Mounting - Sample Block (Optional).............................................. 5
2.3.2 Transmitter Mounting - Direct Pipeline Connection........................................... 6
3 OPERATION ......................................................................................................7
4 MAINTENANCE..................................................................................................8
Contents
Safety ................................................................................................................................ v
Electrical Safety ........................................................................................................... v
Pressure Safety............................................................................................................ v
Toxic Materials............................................................................................................. v
Repair and Maintenance............................................................................................... v
Calibration................................................................................................................... v
Safety Conformity ........................................................................................................ v
Abbreviations......................................................................................................................vi
Warnings............................................................................................................................vi
Appendices
Appendix A Technical Specifications..............................................................................10
A.1 Dimensions.................................................................................11
Appendix B Quality, Recycling & Warranty Information...................................................13
Appendix C Recommended Practices in Humidity Measurements.....................................15
Appendix D Return Document & Decontamination Declaration........................................20
Figures
Figure 1 SF52..........................................................................................................2
Figure 2 Voltage 3-Wire Connections.........................................................................3
Figure 3 mA 3-Wire Connections...............................................................................3
Figure 4 Maximum Load of SF52 3-Wire mA - Including Cable Resistance....................3
Figure 5 Transmitter Mounting..................................................................................5
Figure 6 Transmitter Mounting - Pipe or Duct.............................................................6
Figure 7 Installation Location ...................................................................................7
Figure 8 Indication of Dead Space............................................................................7
Figure 9 Dimensions - SF52....................................................................................11
Figure 10 Dimensions - G½" BSP Sample Block.........................................................11
Figure 11 Dimensions - G½" BSP Sample Block with Filter .........................................11
SF52 User’s Manual
Michell Instruments v
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
qualified personnel and 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 specified safe working pressure is up to 2 MPa, (20 barg / 290 psig)) 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 www.michell.com for details of Michell Instruments’ worldwide offices contact information.
Calibration
The recommended calibration interval for this instrument is 12 months. 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 specification.
SF52 User’s Manual
vi 97224 Issue 5, June 2017
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/m3grams per cubic meter
gr/ft3grains per cubic foot
m meter(s)
mA milliampere
mm millimetres
psi pounds per square inch
% percentage
oz ounces
RH relative humidity
V Volts
“ inches
‘ feet
Warnings
The following general warning listed below is applicable to this instrument. It is 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.
SF52 User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The SF52 dew-point transmitter is a simple, cost effective sensor designed for use in
harsh industrial dryer applications where reliability and toughness are required at an
economical cost.
The SF52 is available with a choice of G ½” and ½” NPT process connections and
voltage or mA outputs. A key feature of the unit is the recessed and protected measuring
element giving an extended sensor life cycle.
Michell's polymer based sensor is calibrated on a high volume traceable calibration
system, providing OEM quantities of units on short deliveries, each with a 3 point
calibration certificate.
1.1 Features
• Ideal for OEM dryer use
• Dew-point measurement range -40 to +60°C (-40 to +140°F)
• Fast response
• Rugged IP65 construction
• 3-point traceable calibration certificate
• Accuracy ±2°C
• Voltage or mA outputs
The SF52 is available with a voltage output (0 to 1 V, 0 to 5 V, 0 to 10 V) or
a current output (4 - 20 mA 3 wire).
The current output has a 3 point diagnostic option:
Sensor fault 23 mA
Under-range dew point 4 mA
Over-range dew point 20 mA
These three values are standard factory programmed and are normally switched off.
Other diagnostic settings are available, please contact Michell Instruments for further
information.
SF52 User’s Manual
297224 Issue 5, June 2017
INSTALLATION
2 INSTALLATION
2.1 Unpacking the Instrument
On delivery, check that all the following standard components are in the packing box:
• SF52 transmitter
• G ½” BSP - Bonded seal fitted over threaded part of transmitter body.
NOTE: Not applicable to the ½" NPT
• Certificate of calibration
• Quick Start Guide
NOTE: If any component is not present, contact Michell Instruments
immediately.
NOTE: Do not touch the filter disc at the front of the SF52.
Figure 1
SF52
SF52 User’s Manual
Michell Instruments 3
INSTALLATION
2.2 Electrical Schematic
White
Green
Yellow (do not use)
Brown
Supply
14 to 30 V for 0 to 10 V output
8 to 30 V for 0 to 1 V output
Figure 2
Voltage 3-Wire Connections
Supply
8 to 30 V for 4 - 20 mA output
White
Green Max load
20 mA
Yellow (do not use)
Brown
Figure 3
mA 3-Wire Connections
2.2.1 Electrical Boundaries mA 3-Wire
100
0
0 5 10 15 20 25 30
200
300
400
500
600
700
800
900
1000
Resistance (ohm)
Figure 4
Maximum Load of SF52 3-Wire mA - Including Cable Resistance
SF52 User’s Manual
497224 Issue 5, June 2017
INSTALLATION
2.3 Transmitter Mounting
Take care to prevent any contamination of the sensor before installation (handle the
transmitter by the main body only, avoiding contact with the filter disc).
The SF52 can be mounted either into a flow-through sensor sampling block (optional)
or directly into a pipe or duct. It can be operated at pressures of up to 2 MPa (20 barg
/ 290 psig) when fitted with the bonded seal provided.
The recommended gas flow rate, when mounted in the optional sampling block, is 1 to
5 Nl/min (2.1 to 10.6 scfh). However, for direct insertion applications, gas flow can be
from static to 10 m/sec (32.8 fps).
NOTE: Pass the seal over the mounting thread and assemble into the sampling
location, by hand, using the wrench flats only.
When installed, fully tighten using a wrench until the seal is fully compressed and to the
following torque settings:
• G ½” BSP 56 Nm (41.3 ft-lbs)
• ½” NPT 56 Nm (41.3 ft-lbs)
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