Michell Instruments SF82 Series User manual

SF82 Online
Dew-Point Hygrometer
User’s Manual
99993 Issue 1
May 2020
nbn Austria GmbH

Please ll out the form(s) below for each instrument that has been purchased.
Use this information when contacting Michell Instruments for service purposes.
Instrument
Code
Serial Number
Invoice Date
Location of Instrument
Tag No
Instrument
Code
Serial Number
Invoice Date
Location of Instrument
Tag No
Instrument
Code
Serial Number
Invoice Date
Location of Instrument
Tag No

© 2020 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.
For Michell Instruments' contact information please go to
www.michell.com
SF82 Online

SF82 Online User’s Manual
iv 99993 Issue 1, May 2020
Contents
Safety ...............................................................................................................................vii
Electrical Safety ..........................................................................................................vii
Pressure Safety ...........................................................................................................vii
Toxic Materials ............................................................................................................vii
Repair and Maintenance ..............................................................................................vii
Calibration ..................................................................................................................vii
Safety Conformity .......................................................................................................vii
Abbreviations .................................................................................................................... viii
Warnings .......................................................................................................................... viii
1 INTRODUCTION ................................................................................................1
1.1 Features ............................................................................................................ 2
2 INSTALLATION ..................................................................................................3
2.1 Unpacking the Instrument ................................................................................... 3
2.1.1 Unpacking the SF82 Transmitter ..................................................................... 4
2.1.2 Unpacking the Monitor .................................................................................. 4
2.1.3 Accessories Pack ........................................................................................... 5
2.2 SF82 Online Components .................................................................................... 5
2.3 Monitor .............................................................................................................. 6
2.3.1 Fault Conditions ............................................................................................ 6
2.3.2 Monitor Controls and Indicators ..................................................................... 7
2.3.3 Electrical Connections .................................................................................... 8
2.3.4 AC Power Supply Input ................................................................................ 10
2.3.5 DC Power Supply Input (not available at present) .......................................... 11
2.3.6 Transmitter Connection ................................................................................ 12
2.3.7 Signal Output Connections ........................................................................... 13
2.3.7.1 Alarm Outputs ..................................................................................... 13
2.3.7.2 Re-transmission Output ........................................................................ 13
2.3.7.3 RS485 Modbus RTU Communications Port ............................................... 13
2.3.8 Mounting the Monitor .................................................................................. 14
2.4 SF82 Transmitter .............................................................................................. 15
2.4.1 SF82 DIN 43650 Connector Version .............................................................. 15
2.4.1.1 Electrical Connections ............................................................................ 16
2.4.1.2 Cable Connection to Transmitter ............................................................. 16
2.4.1.3 Sensor Cable Self-Assembly ................................................................... 17
2.4.2 SF82 M12 Connector Version ....................................................................... 18
2.4.2.1 Electrical Connections ............................................................................ 18
2.4.2.2 SF82 M12 Cables .................................................................................. 19
2.4.3 Cable Selection for Self-Assembled Cables ..................................................... 19
2.4.4 Maximum Loop Resistance vs Supply Voltage ................................................ 19
2.5 Transmitter Mounting ........................................................................................ 20
2.5.1 5/8” 18 UNF Version .................................................................................... 20
2.5.2 3/4” - 16 UNF Version ................................................................................. 20
2.5.3 G1/2” BSPP Version ..................................................................................... 20
2.5.4 Transmitter Mounting – Sample Block (Optional) ........................................... 21
2.5.5 Transmitter Mounting – Direct Pipeline Connection ........................................ 22
2.5.6 Transmitter Mounting – With Additional Process Connection Adapter .............. 23
2.6 Mounting the Sample Block and Transmitter ....................................................... 24
2.6.1 Sample Block Gas Connections ..................................................................... 24

SF82 Online User’s Manual
Michell Instruments v
3 OPERATION ....................................................................................................26
3.1 General Operational Information ....................................................................... 26
3.2 Preparation For Operation ................................................................................. 27
3.2.1 First-Time Operation .................................................................................... 27
3.3 Monitor Setup .................................................................................................. 28
3.3.1 Change alarm type (high/low) ...................................................................... 28
3.3.2 Change alarm set-points .............................................................................. 30
3.3.3 Analog output: change from 4–20mA to 0–20mA .......................................... 31
3.3.4 Monitor Input Range .................................................................................. 31
3.3.5 Set the monitor to °F dew-point mode ......................................................... 32
3.3.6 Set the monitor to ppmV mode (not available) ............................................... 33
3.3.7 Monitor Limits When Unit Scaled to ppmV (not available) ............................... 34
3.3.8 Alarm Set-Point Limit Conguration .............................................................. 35
3.3.9 Digital Communication Parameters Set-Up .................................................... 36
3.4 Modbus RTU over RS485 Communications .......................................................... 38
4 GOOD MEASUREMENT PRACTICE .....................................................................42
4.1 General Operational Guidelines ......................................................................... 42
4.2 Maintenance and Calibration ............................................................................ 44
4.2.1 Clean Monitor ............................................................................................ 44

SF82 Online User’s Manual
vi 99993 Issue 1, May 2020
Appendices
Appendix A Technical Specications .............................................................................. 46
A.1 Dimensions .................................................................................47
Appendix B Quality, Recycling & Warranty Information ................................................... 49
Appendix C Return Document & Decontamination Declaration ........................................51
Tables
Table 1 Monitor Front Panel Controls and Indicators ..................................................7
Table 2 Summary of Electrical Connections ...............................................................9
Figures
Figure 1 SF82 Online Monitor and Transmitter ...........................................................1
Figure 2 Unpacking Method ......................................................................................3
Figure 3 Transmitter Unpacking Method ....................................................................4
Figure 4 Monitor Unpacking Method ..........................................................................4
Figure 5 Accessories Pack ........................................................................................5
Figure 6 SF82 Online Components ............................................................................5
Figure 7 Monitor Panel Layout ..................................................................................6
Figure 8 Monitor Rear Panel Connections ..................................................................9
Figure 9 AC Power Supply Connections ...................................................................10
Figure 10 DC Power Supply Connections ...................................................................11
Figure 11 Transmitter Connections............................................................................12
Figure 12 Digital Communications Port ......................................................................13
Figure 13 Mounting the Monitor ...............................................................................14
Figure 14 SF82 Transmitter ......................................................................................15
Figure 15 Connector Installation ...............................................................................16
Figure 16 Connector Terminal Block Removal ............................................................17
Figure 17 Cable Assembly ........................................................................................17
Figure 18 Sensor Connector Installation ....................................................................18
Figure 19 Maximum Load of SF82 – Including Cable Resistance ..................................19
Figure 20 Transmitter Mounting – Sensor Block .........................................................21
Figure 21 Transmitter Mounting – Pipe or Duct ..........................................................22
Figure 22 Transmitter Mounting with Adapter ...........................................................23
Figure 23 Sample Block Gas Connections ..................................................................24
Figure 24 Typical Display .........................................................................................27
Figure 25 Change Alarm Switching Logic ...................................................................29
Figure 26 Set-up Alarm Levels ..................................................................................30
Figure 27 Congure Analog Output ...........................................................................31
Figure 28 Span and Unit Settings .............................................................................32
Figure 29 Set-up Monitor (to read ppmV ) ...................................................................34
Figure 30 Set-up Alarm Set-Point Limits ....................................................................35
Figure 31 Set-up Data Communications Parameters ...................................................37
Figure 32 Installation Location .................................................................................42
Figure 33 Indication of Dead Space ..........................................................................42
Figure 34 Dimensions .............................................................................................47

SF82 Online User’s Manual
Michell Instruments vii
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 specied safe working pressure (SWP), for this instrument is 45 MPa (450 barg / 6500 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. For
contact information visit the website at 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 re-calibration.
Safety Conformity
This product meets the essential protection requirements of the relevant EU and US directives.

SF82 Online User’s Manual
viii 99993 Issue 1, May 2020
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
bara bar absolute
°C degrees Celsius
°F degrees Fahrenheit
DC direct current
ft foot (feet)
g gram(s)
Hz Hertz
lbf-ft pound force per foot
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)
RS485 serial data transmission standard
Rx receive
scfh standard cubic feet per hour
scfs standard cubic feet per second
SWP safe working pressure
sec second(s)
temp temperature
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.
Where this symbol appears in the following sections it is used
to indicate areas of potential risk of electric shock.

SF82 Online User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The SF82 Online Fast Response dew point hygrometer has been developed as a fast-
response, quick-to-install hygrometer system for the complete dew-point measurement
range of -60 up to +60°C (-76 up to +140°F) dew point, which covers many moisture
measurement applications.
The system comprises a programmable monitor congured to accept a 4–20 mA current
loop signal from the Michell thick-lm dew-point transmitter. The span of the transmitter
is set to cover the measurement range -60 to +60ºC (-76 to +140ºF) dew point at
operating pressures up to 10 Mpa (100 barg / 1450 psig).
The monitor also has a re-transmission facility which buers the transmitter output for
onward transmission to other systems. The transmitter input to the monitor is congured
as a 4–20 mA current loop signal and the re-transmitted output can be congured as
either a 4–20 mA or a 0–20 mA current loop signal (ranged as per the input).
Two alarm outputs are provided for connection to external systems. Alarm 1 provides
a set of single pole make contacts and Alarm 2 provides a set of changeover contacts.
Both sets are potential free and Alarm 1 contacts (single pole make) are rated at 250
V, 3 A and the Alarm 2 contacts (changeover) are rated at 250 V, 5 A.
A digital communications interface is also provided to enable retrieval of transmitter
values and fault status via Modbus RTU over RS485.
Figure 1 shows the monitor and the transmitter.
Figure 1 SF82 Online Monitor and Transmitter

SF82 Online User’s Manual
299993 Issue 1, May 2020
INTRODUCTION
1.1 Features
The SF82 Online Hygrometer is simple to use and install, and can be congured to meet
specic needs.
• 5/8” - 18 UNF, 3/4” - 16 UNF, G1/2” BSP process connections
• Dew point
• Sensor MiniDIN: IP66; NEMA 4 (see technical specication)
Sensor M12: IP65
Monitor: IP65 (NEMA 4X) front
• Measurement range -60 to +60°C (-76 to +140°F) dew point; -50 to
+50°C (-58 to +122°F) dew point; -50 to +30°C (-58 to +86°F) dew
point; non-standard dp ranges available on request
• Dual alarms
• Accuracy ±2°C dew point
• Clear and easy to read display
• Calibration certicate (traceable to NPL and NIST)
• 4–20mA re-transmission
• Modbus RTU over RS485 digital communications

SF82 Online User’s Manual
Michell Instruments 3
INSTALLATION
2 INSTALLATION
It is essential that the connection of electrical and gas supplies
to this instrument be undertaken by competent personnel.
2.1 Unpacking the Instrument
The Easidew instruments and accessories are packed into a box and the method of
unpacking is shown as follows:
Figure 2 Unpacking Method
Open the box and unpack carefully as follows. Save all the packing materials for the
purpose of returning the instrument for re-calibration or any warranty claims. Note that
the packing method may vary slightly in the U.S.
1. Remove the top packing (1)
2. Remove the dew-point transmitter box (3)
3. Remove the accessories pack (4)
4. Remove the monitor box (2)

SF82 Online User’s Manual
499993 Issue 1, May 2020
INSTALLATION
2.1.1 Unpacking the SF82 Transmitter
NOTE: For environmental and operating conditions refer to Appendix A.
Unpack the dew-point transmitter box as follows :
7653 421
Figure 3 Transmitter Unpacking Method
1. Unscrew the cap (1) from the packing tube (6). Remove the foam block
(2).
1. Remove the transmitter from the tube, complete with the body cover (4)
and tip cover (5).
2. Remove the body cover (4) and the tip cover (5) but leave the blue plastic
protective cover (3) in place until ready for installation.
NOTE: The transmitter sensing element is protected while in transit by a blue,
green or black 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.
2.1.2 Unpacking the Monitor
The monitor (2) is packed, together with its xing clamps (1) as shown below.
SMART OUTPUT Module System
Process Indicator
°Cdp
°Fdp
12
Figure 4 Monitor Unpacking Method

SF82 Online User’s Manual
Michell Instruments 5
INSTALLATION
2.1.3 Accessories Pack
The accessories pack is shown below.
1
2
3
4
Figure 5 Accessories Pack
Remove the screwdriver (1), the two leads (2) and (3) and the sample block (4) from
the bag.
2.2 SF82 Online Components
On delivery please check that all the following standard components are present in the
packing box. Report any shortages to Michell Instruments, immediately.
1
2
3
4
5
6
7
8
97211 Issue 01, May 2010
Figure 6 SF82 Online Components
1. Monitor clamps (2 o)
2. SF82 Monitor
3. Transmitter cable assembly (MiniDIN/M12 versions)
4. Power cable
5. Screwdriver
6. Calibration certicate
7. Sample block
8. SF82 transmitter

SF82 Online User’s Manual
699993 Issue 1, May 2020
INSTALLATION
2.3 Monitor
The controls and indicators associated with the SF82 Online are located on the front
panel of the monitor.
Connections to the SF82 dew-point transmitter, the digital communications port and the
external power supply are all made to the rear panel of the monitor.
Hygrometer
6
Figure 7 Monitor Panel Layout
2.3.1 Fault Conditions
Message
Displayed Cause Action
ErrL
Sensor failure
Check power supply to transmitter. Check
transmitter cable for continuity/damage.
Rectify/replace cable
Instrument failure Refer to Michell or local representative for
repair
Sbr Sensor failure or break in
sensor connection
Check transmitter cable for continuity/
damage.
Rectify/replace cable
ErrH
Gas is wetter than wettest
selected dew-point value Check gas source supply
Sensor contaminated Replace/re-calibrate transmitter
outR Input out of range Check gas source supply.
Re-calibrate/replace transmitter
rurC Reverse input connection Swap input connections from the
transmitter to the monitor

SF82 Online User’s Manual
Michell Instruments 7
INSTALLATION
2.3.2 Monitor Controls and Indicators
Item Description
1
°F units indicator
Indicates that the displayed dew-point reading is in degrees Fahrenheit.
2
°C units indicator
Indicates that the displayed dew-point reading is in degrees Celsius.
3
Main reading display
Displays the value measured by the connected transmitter, or ashes one of the status
conditions shown in Section 2.3.1.
4
AL1
Indicates alarm relay 1 is active, which by default is a LOW alarm.
5
AL2
Indicates alarm relay 2 is active, which by default is a HIGH alarm.
Section 3.3.2 details the setting up of AL2 trip points.
6
Item Description
6.1 Program Key (P)
6.2 Left arrow (decrement)
6.3 Right arrow (increment)
6.4 Set Key (P)
Table 1 Monitor Front Panel Controls and Indicators
Launches the menu system. Also used as a back button to exit menus.
Scrolls through submenus OR decreases selected parameter.
Scrolls through submenus OR increases selected parameter.
Used to enter menus OR accept the new value of the currently
selected parameter.

SF82 Online User’s Manual
899993 Issue 1, May 2020
INSTALLATION
2.3.3 Electrical Connections
Electrical connections to the SF82 Online system are as follows:
Required:
• AC power supply, 100 to 240 V AC (-15%, +10%), 50/60 Hz, 6 VA. The
low voltage (24 V DC) option is not available at present.
Optional:
• Transmitter current loop input, 4–20 mA (24 V DC loop power provided
by monitor).
• Alarm 1 (Low), potential free contacts, single pole make. Contacts rated
at 250 V, 3 A.
• Alarm 2 (High), potential free contacts, single pole changeover. Contacts
rated at 250 V, 5 A.
• Re-transmitted input signal from the dew-point transmitter 4–20 mA or
0–20 mA.
• Modbus RTU over RS485 digital communications interface.

SF82 Online User’s Manual
Michell Instruments 9
INSTALLATION
Figure 8 Monitor Rear Panel Connections
Terminal Wire Colour Signal Supply Information
1 Blue 0 V (GND) Transmitter Cable Screen
3Green 4–20 mA loop return
4Red Transmitter loop supply
(+ve) +24 V DC w.r.t. terminal 1
7User dened ALR2 (normally closed)
9
7
8
8 User dened ALR2 (normally open)
9User dened ALR2 (common)
13 User dened Current loop out (-ve) Default 4–20 mA
14 User dened Current loop out (+ve) Default 4–20 mA
16 User dened ALR1 (common)
16
17
17 User dened ALR1 (normally open)
23 (AC Version) Blue Power in (neutral) 100 – 240 V, 50/60 Hz
24 (AC Version) Brown Power in (live) 100 – 240 V, 50/60 Hz
23 (DC Version) Blue Negative (-) 0 V *
24 (DC Version) Brown Positive (+) 24 V *
NOTE: There are no terminals in positions
5, 6, 10, 11, 12, 15, 18, 19, 20, 21 and 22
Table 2 Summary of Electrical Connections
* NOTE: Not available at present

SF82 Online User’s Manual
10 99993 Issue 1, May 2020
INSTALLATION
2.3.4 AC Power Supply Input
It is essential that the connection of electrical supplies to this
instrument be undertaken by competent personnel.
Connect the AC power supply to the monitor as shown in Figure 9 . Refer also to Table 2
which gives a summary of all the connections to the rear panel of the monitor.
14 15 16 17 18 19 20 21 22 23
2345678910 11
2
1
4
3
Monitor
viewed from underneath
Figure 9 AC Power Supply Connections
1. Ensure that no power is connected to the mains lead.
2. Connect the blue (white – US standard) (neutral) lead (2) to terminal 23
on the rear panel of the monitor.
3. Connect the brown (black – US standard) (live) lead (3) to terminal 24 on
the rear panel of the monitor.
4. Strip back the insulation on the free end of the power cable and wire to
an appropriate power supply plug (brown lead to live supply terminal,
blue lead to neutral supply terminal).
5. Check that the wiring has been completed correctly before connecting to
a mains power supply.

SF82 Online User’s Manual
Michell Instruments 11
INSTALLATION
2.3.5 DC Power Supply Input (not available at present)
Connect the DC power supply to the monitor as shown in Figure 10 . Refer also to
Table 2 which gives a summary of all the connections to the rear panel of the monitor.
14 15 16 17 18 19 20 21 22 23
2345678910 11
-
+
2
1
4
3
Monitor
viewed from underneath
Figure 10 DC Power Supply Connections
1. Ensure that no power is connected to the mains lead.
2. Connect the blue (white – US standard) lead (2) to terminal 23 on the
rear panel of the monitor.
3. Connect the brown (black – US standard) lead (3) to terminal 24 on the
rear panel of the monitor.
4. Strip back the insulation on the free end of the power cable and wire
to an appropriate power supply plug (brown lead to positive (+) supply
terminal, blue lead to negative (-) supply terminal).
5. Check that the wiring has been completed correctly before connecting to
a 24 V power supply.

SF82 Online User’s Manual
12 99993 Issue 1, May 2020
INSTALLATION
2.3.6 Transmitter Connection
Connect the transmitter cable to the monitor as shown below:
14 15 16 17 18 19 20 21 22 23
2345678910 11
1
234
4
3
Monitor
viewed from above
2
Figure 11 Transmitter Connections
1. Connect the blue wire (2) of the transmitter cable to terminal 1 on the
monitor (1).
2. Connect the green wire (3) of the transmitter cable to terminal 3 on the
monitor.
3. Connect the red wire (4) of the transmitter cable to terminal 4 on the
monitor.
4. Check that the transmitter cable wiring has been completed correctly.