Michell Instruments SF82, SF82 M12, SF82 MiniDIN 43650 User Manual
SF82
Dew-Point Transmitter
User’s Manual
97576 Issue 1
nbn Austria GmbH
June 2019
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SF82
For Michell Instruments’ contact information please go to
www.michell.com
© 2019 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.
SF82 Transmitter User’s Manual
CONTENTS
Safety ........................................................................................................................ iii
Electrical Safety .......................................................................................................... iii
Pressure Safety ........................................................................................................... iii
Toxic Materials ............................................................................................................ iii
Repair and Maintenance .............................................................................................. iii
Calibration .................................................................................................................. iii
Safety Conformity ....................................................................................................... iv
Abbreviations .............................................................................................................. iv
Warnings .................................................................................................................... iv
1. INTRODUCTION ..................................................................................................... 1
2. INSTALLATION ....................................................................................................... 2
2.1. Unpacking the Instrument ......................................................................................... 2
2.2. Preparation of the Sensor Cable ................................................................................ 3
2.3. Cable Connection ..................................................................................................... 5
2.4. Electrical Schematic .................................................................................................. 5
2.4.1. Electrical Boundaries ........................................................................................... 6
2.4.2. Digital Communications (M12 Version Only) .......................................................... 6
2.5. Transmitter Installatiom ............................................................................................ 6
2.5.1. Sampling Considerations ..................................................................................... 6
2.5.2. Good Measuring Practice ..................................................................................... 9
2.5.3. Transmitter Mounting ....................................................................................... 12
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SF82 Transmitter User’s Manual
APPENDICES
Appendix A ............................................................................................................... 16
Technical Specifications ................................................................................................. 17
Product Dimensions ...................................................................................................... 19
Appendix B ............................................................................................................... 22
Quality, Recycling & Warranty Information ...................................................................... 23
Appendix C ............................................................................................................... 24
Return Document & Decontamination Declaration ........................................................... 25
Appendix D ............................................................................................................... 26
Modbus Register Map .................................................................................................... 27
Register Address ........................................................................................................... 28
FIGURES
Figure 1 Connector Terminal Block Removal ......................................................................... 3
Figure 2 Wiring Connections ............................................................................................... 3
Figure 3 Sensor Connector Installation ................................................................................. 4
Figure 4 Cable Connections ................................................................................................. 4
Figure 5 Connector Installation ............................................................................................ 5
Figure 6 2-Wire Connection Diagram ................................................................................... 5
Figure 7 Maximum Load of SF82 - Including Cable Resistance................................................ 6
Figure 8 Installation Location .............................................................................................. 7
Figure 9 Installation Location .............................................................................................. 8
Figure 10 Transmitter Mounting - Sensor Block ..................................................................... 9
Figure 11 Material Permeability Comparison ......................................................................... 9
Figure 12 Transmitter Mounting - Pipe or Duct ................................................................... 12
Figure 13 Transmitter Mounting with Adapter ..................................................................... 14
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SF82 Transmitter 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
This instrument is designed to be electrically safe when used with the options and accessories
supplied by Michell Instruments for use with it. This instrument has been independently verified
as complying with the IEC/EN 61010 Standard for Electrical Safety for Europe and for the
equivalent 61010 standards in use in N. America. The instrument is approved for use within the
operating temperature range of -40°C to +60°C, and dependant on version, as being IP66/65.
See Specification section for full details.
Pressure Safety
DO NOT permit pressures greater than the safe working pressure to be applied to the instrument.
The specified safe working pressure is 45 MPag (450 barg / 6500 psig). 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 be maintained either by the manufacturer or an accredited service agent.
For Michell Instruments’ contact information please go to www.michell.com.
Calibration
The recommended calibration interval for this instrument is 12 months unless it is to be used in
a mission-critical 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 recalibration.
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SF82 Transmitter User’s Manual
Where this hazard symbol appears in the following
Safety Conformity
This product meets the essential protection requirements of the relevant EU and US standards
and directives.
Abbreviations
The following abbreviations are used in this manual:
barg pressure unit (=100 kP or 0.987 atm) (bar gauge)
ºC degrees Celsius
ºF degrees Fahrenheit
DC direct current
g grams
in inch(es)
µm micrometer
m/sec meters per second
mA milliampere
mm millimetres
MPa megapascal
Nl/min normal liters per minute
Nm Newton meter
oz ounces
psig pounds per square inch
RH relative humidity
scfh standard cubic feet per hour
fps feet per second
T temperature
V Volts
Ω Ohms
ø diameter
Warnings
The following general warning listed below is applicable to this instrument. It is repeated in the
text in the appropriate locations.
sections it is used to indicate areas where potentially
hazardous operations need to be carried out.
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SF82 Transmitter User’s Manual
1. INTRODUCTION
The Michell Instruments SF82 is a loop-powered dew-point transmitter, designed to make dew
point measurements in a flowing sample. The SF82 transmitter is available with 3 different
process connections:
• 5/8” - 18 UNF
• 3/4” – 16 UNF
• G1/2” - BSPP
The SF82 2-wire is available with a choice of electrical connections:
• DIN 43650 Form C
• M12 5-pin
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SF82 Transmitter User’s Manual
2. INSTALLATION
2.1. Unpacking the Instrument
On delivery, please check that all the following standard components are in the packing box:
• SF82 Transmitter
• Certificate of Calibration
• Connector (for sensor/cable) for MiniDIN 43650 C version only
It is recommended that all packaging is retained, in case products are returned for service or
calibration. Alternatively, if you choose to dispose of the packaging materials, ensure they are
recycled in accordance with local legislation.
The transmitter will also be supplied with a process seal, which will be fitted to the unit.
Depending on the version, this will either be a bonded seal (5/8” or G1/2” thread versions) or an
o-ring seal (3/4” thread versions).
The transmitter sensing element is protected while in transit by a cover containing a
small desiccant capsule. The connection pins are protected by a red plastic cap. None
of these plastic items are required for the operation of the transmitter. It is
recommended that the MiniDIN 43650 C connector is kept in a safe place until the
transmitter is ready for wiring.
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SF82 Transmitter User’s Manual
Caution: when removing the central screw ensure that
Figure 2 Wiring Connections
Figure 1 Connector Terminal Block Removal
2.2. Preparation of the Sensor Cable
The sensor cable is NOT supplied as standard. Cables can be obtained by contacting your local
Michell Instruments representative (see www.michell.com for details).
DIN 43650 Version
Cable connections to the SF82 transmitter are made via the removable connector. Removing the
central screw enables the connector terminal block to be removed from the outer housing by
using a small screwdriver to prise it clear.
\
the small sealing O-ring and the washer are retained on
the screw and are present during re-installation
The sensor cables are terminated as per the following diagram:
Note: The cable screen (see figure 2) should only be connected to a ground point at
either the transmitter installation side, or at the receiving equipment. Failure to
observe this precaution can result in ground loops and equipment malfunction.
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SF82 Transmitter User’s Manual
Always connect the 4-20 m return signal to a suitable load
4-20 mA 2-wire
PIN 1
Modbus A
PIN 2
Modbus B
PIN 3
4-20 mA
PIN 4
Power Supply
PIN 5
0 V
Function
Pin
Wire Colour
Modbus A
1
Brown
Modbus B
2
White
4 -20 mA
3
Blue
Power Supply
4
Black
0 v
5
Grey
Figure 3 Sensor Connector Installation
(see figure 3) before the power is applied. Without this
connection, the transmitter may be damaged if allowed to
operate for prolonged periods.
M12 5-Pin Version
Cables with moulded M12 connectors are available from Michell Instruments in the following
lengths:
• 0.8 m
• 2 m
• 5 m
• 10 m
The other end of the sensor cable is unterminated, for straightforward connection into the
desired monitoring system.
Figure 4 Cable Connections
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SF82 Transmitter User’s Manual
Figure 5 Connector Installation
Figure 6 2-Wire Connection Diagram
O-ring and
washer
If longer cable runs are required, off the shelf 5-pin M12 cables can be connected between the
SF82 transmitter and the cable provided by Michell Instruments.
Note: The cable screen should only be connected to ground point at either the
transmitter installation side or at the receiving equipment. Failure to observe this
precaution can result in ground loops and equipment malfunction.
2.3. Cable Connection
DIN 43650 Version
To ensure the specified ingress protection is achieved, when installing the connector, the securing
screw (with the O-ring and washer) must be tightened to a minimum torque of 3.4 Nm (2.5 ftlbs). The sensor cable used must be a minimum diameter of 4.6 mm (0.2”).
M12 5-Pin Version
The connector should be installed by aligning the locating pin on the transmitter with the slot
on the cable. The connector can then be pushed into place and rotated until finger tight.
2.4. Electrical Schematic
Note: The cable screen should only be connected to a ground point at either the
transmitter installation side, or at the receiving equipment. Failure to observe this
precaution can result in ground loops and equipment malfunction.
5 Michell Instruments
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