Michell Instruments S8000 User manual

S8000 Integrale
Chilled Mirror Hygrometer
User’s Manual
Water Content
Pressure
Dewpoint °C
°C
Bara
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
gm
3
dp
Water Content
Pressure
Dewpoint °C
°C
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
dp
Water Content
Pressure
Dewpoint °C
°C
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
dp
97102 Issue 9.4
March 2016

Please fill out the form(s) below for each instrument that has been purchased.
Use this information when contacting Michell Instruments for service purposes.
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© 2016 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.
Water Content
Pressure
Dewpoint °C
°C
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
dp
S8000 Rack-Mount Version
For Michell Instruments' contact information please go to
www.michell.com

S8000 Integrale User’s Manual
iv 97102 Issue 9.4, March 2016
1 INTRODUCTION................................................................................................1
1.1 Operating Principle............................................................................................. 2
2 INSTALLATION..................................................................................................4
2.1 Safety................................................................................................................ 4
2.2 Unpacking the Instrument................................................................................... 4
2.3 Operating Requirements ..................................................................................... 6
2.3.1 Environmental Requirements ......................................................................... 6
2.3.2 Electrical Requirements ................................................................................. 6
2.4 Exterior Layout................................................................................................... 7
2.5 Rear Panel Connections (All Versions) ................................................................ 10
2.5.1 Power Supply Input..................................................................................... 10
2.5.2 Analog Output Connections.......................................................................... 11
2.5.3 Alarm Output Connections........................................................................... 12
2.5.4 Remote PRT Probe (Optional) ..................................................................... 14
2.5.5 4-Wire PRT Output...................................................................................... 15
2.5.6 USB Communications Port Connector............................................................ 15
2.5.7 Connection of Gas Supplies.......................................................................... 16
2.5.8 Conversion of a Horizontal Version to Rack Mount ........................................ 18
2.5.9 Fitting Rack Mounted Version into Rack ........................................................ 19
2.5.10 Fitting the Safety Strap................................................................................ 20
3 OPERATION ....................................................................................................21
3.1 General Operational Information........................................................................ 21
3.2 Function Keys................................................................................................... 22
3.2.1 Up and Down Arrow Keys .......................................................................... 22
3.2.2 Left and Right Arrow Keys ........................................................................... 22
3.2.3 Enter or Select Key...................................................................................... 22
3.3 Instrument Display........................................................................................... 23
3.3.1 Operational Data Display ............................................................................. 24
3.3.2 Operational Status Display........................................................................... 25
3.4 Menu Structure ................................................................................................ 26
3.4.1 Operating Cycle .......................................................................................... 28
3.5 First Time Operation - Operate Mode................................................................. 29
3.6 Operating Functions ......................................................................................... 30
3.6.1 DCC - Dynamic Calibration Control ............................................................... 30
3.6.2 MAXCOOL Function..................................................................................... 32
3.6.3 STANDBY Function...................................................................................... 33
3.6.4 SETUP Menu............................................................................................... 34
3.7 Pressure Measurements.................................................................................... 36
3.8 Logging Function.............................................................................................. 36
3.9 FAST - Frost Assurance Technology.................................................................... 37
3.10 External PRT.................................................................................................... 38
Contents
Safety ..............................................................................................................................viii
Electrical Safety .........................................................................................................viii
Pressure Safety..........................................................................................................viii
Toxic Materials...........................................................................................................viii
Repair and Maintenance.............................................................................................viii
Calibration.................................................................................................................viii
Safety Conformity ......................................................................................................viii
Abbreviations......................................................................................................................ix
Warnings............................................................................................................................ix

S8000 Integrale User’s Manual
Michell Instruments v
4 APPLICATION SOFTWARE ................................................................................39
4.1 Installation....................................................................................................... 39
4.2 Establishing Communications ............................................................................ 39
4.2.1 USB Communication.................................................................................... 40
4.3 Data Acquisition or Edit Variables Mode.............................................................. 41
4.3.1 Data Acquisition.......................................................................................... 42
4.3.2 Variable Edit............................................................................................... 44
5 MAINTENANCE................................................................................................46
5.1 Safety.............................................................................................................. 46
5.2 Fuse Replacement ........................................................................................... 46
5.3 Fan Filter Cleaning............................................................................................ 47
5.4 Sensor Mirror Cleaning...................................................................................... 48
5.4.1 Fitting the Microscope (Optional).................................................................. 49
6 GOOD MEASUREMENT PRACTICE.....................................................................50
6.1 Sampling Hints................................................................................................. 51
7 CALIBRATION..................................................................................................54
7.1 Traceability ...................................................................................................... 54
8 PREPARATION FOR SHIPPING..........................................................................55
Tables
Table 1 Front Panel Controls and Indicators ..............................................................8
Table 2 Rear Panel Controls and Indicators ...............................................................9
Table 3 Default Set-Up Parameters.........................................................................35
Table 4 Data Acquisition Control Description ...........................................................42
Table 5 Graph Control Description..........................................................................43
Table 6 Status Bar Description ...............................................................................43
Table 7 Modbus Holding Register Map ....................................................................67
Table 8 Register Configuration A ............................................................................68
Table 9 Register Configuration B1...........................................................................68
Table 10 Register Configuration B2...........................................................................68
Table 11 Register Configuration D Status Word .........................................................69
Table 12 Register Configuration E Units....................................................................69
Table 13 Register Configuration F Display Setting A...................................................69
Table 14 Register Configuration F Display Setting B...................................................70
Table 15 Register Configuration H............................................................................70
Table 16 Register Configuration J.............................................................................70
Table 17 Register Configuration K ............................................................................70
Table 18 Register Configuration L.............................................................................71
Table 19 Register Configuration M............................................................................71
Table 20 Register Configuration N............................................................................71
Table 21 Register Configuration P.............................................................................73

S8000 Integrale User’s Manual
vi 97102 Issue 9.4, March 2016
Figures
Figure 1 S8000 - Horizontal Model............................................................................1
Figure 2 Operating Principle.....................................................................................3
Figure 3 S8000 Integrale Packing .............................................................................4
Figure 4 S8000 Accessories......................................................................................5
Figure 5 Front Panel................................................................................................8
Figure 6 Rear Panel .................................................................................................9
Figure 7 Power Supply Input..................................................................................10
Figure 8 Analog Output Connectors ........................................................................11
Figure 9 Alarm Output Connectors..........................................................................13
Figure 10 Remote PRT Connection............................................................................14
Figure 11 Internal PRT Output .................................................................................15
Figure 12 USB Port Connection.................................................................................15
Figure 13 Gas Connections.......................................................................................16
Figure 14 Conversion of Horizontal to Rack Mount.....................................................18
Figure 15 Rack Fixing Method ..................................................................................19
Figure 16 Removing the Blanking Plug......................................................................20
Figure 17 Fitting or Removing the Safety Strap..........................................................20
Figure 18 Function Keys...........................................................................................22
Figure 19 Typical Front Page Display.........................................................................23
Figure 20 Set-up Display..........................................................................................24
Figure 21 Main Menu...............................................................................................26
Figure 22 Menu Structure ........................................................................................27
Figure 23 Typical Operating Cycle.............................................................................28
Figure 24 Main Display ............................................................................................29
Figure 25 Main Menu Display ...................................................................................30
Figure 26 DCC ON/OFF............................................................................................31
Figure 27 Switching MAXCOOL and MEASURE Mode ..................................................32
Figure 28 Switching STANDBY and OPERATE Mode....................................................33
Figure 29 Set-up Menu Selection..............................................................................34
Figure 30 DCC Sub-Menu Selection...........................................................................34
Figure 31 Set Parameter Value.................................................................................34
Figure 32 Communications Setup Screen ..................................................................39
Figure 33 Windows Device Manager Screen ..............................................................40
Figure 34 Options Screen.........................................................................................41
Figure 35 Data Acquisition Screen ............................................................................42
Figure 36 S8000 Series Variables Editor Screen .........................................................45
Figure 37 Power Supply Fuse Replacement ...............................................................46
Figure 38 Remove and Replace Fan Filter..................................................................47
Figure 39 Mirror and Optics Cleaning........................................................................48
Figure 40 Fitting the Microscope...............................................................................49
Figure 41 Typical Calibration Certificate.....................................................................54
Figure 42 Instrument Packing Details........................................................................55
Figure 43 Select Format...........................................................................................60
Figure 44 Set Format Properties...............................................................................60
Figure 45 Format Disc .............................................................................................60
Figure 46 Modbus Connection..................................................................................65
Figure 47 Device Manager Screen.............................................................................76
Figure 48 Communications Window..........................................................................77

S8000 Integrale User’s Manual
Michell Instruments vii
Appendices
Appendix A Technical Specifications..............................................................................57
Appendix B Formatting SD cards .................................................................................60
Appendix C Calculations ..............................................................................................62
C.1 Water Content.............................................................................62
C.2 Temperature - Dew Point ...........................................................62
C.3 °C to °F Calculation ....................................................................62
C.4 % RH Calculation ........................................................................62
C.5 Conversion of bara to psia and kPa ..............................................63
Appendix D Modbus RTU Communications ....................................................................65
D.1 Introduction ...............................................................................65
D.2 Basic Modbus Operation ..............................................................65
D.3 Modbus RTU Connections and Protocol..........................................66
D.4 Register Map ..............................................................................66
Appendix E Installation of the Application Software.......................................................75
Appendix F EU Declaration of Conformity......................................................................79
Appendix G Quality, Recycling & Warranty Information...................................................81
G.1 Pressure Equipment Directive (PED) 97/23/EC...............................81
G.2 Recycling Policy ..........................................................................81
G.3 WEEE Compliance........................................................................81
G.4 RoHS2 Compliance ......................................................................82
G.5 Warranty.....................................................................................82
G.6 REACH Compliance......................................................................83
G.7 Calibration Facilities .....................................................................83
G.8 Return Policy...............................................................................84
G.9 Manufacturing Quality..................................................................84
Appendix H Return Document & Decontamination Declaration........................................86

S8000 Integrale User’s Manual
viii 97102 Issue 9.4, March 2016
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. The input power supply voltage limits are 85 to
264 V AC, 47/63 Hz. Refer to Appendix A - Technical Specifications.
Pressure Safety
!
Before pressurizing, the user must ensure through appropriate
protective measures that the system or the device will not be over-
pressurized. When working with the instrument and pressurized
gases safety glasses should be worn.
DO NOT permit pressures greater than the safe working pressure to be applied to the instrument.
The specified maximum safe working pressure is 1 barg (14.5 psig) for the low pressure version, or
17 barg (250 psig) for the high pressure version. The safety strap MUST be used when operating at
pressures above 1 barg (14.5 psig), refer to Section 2.5.10. This instrument is not designed to accept
gas pressures higher than the specified maximum working pressure.
Application of gas pressures higher than the specified maximum will result in potential damage
and may render the instrument unsafe and in a condition of incorrect functionality. Only personnel
trained in the safe handling of high pressure gases should be allowed to operate this instrument.
Refer to Appendix A - Technical Specifications in this manual.
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 the S8000 Integrale is one year, unless otherwise specified
by Michell Instruments Ltd. The instrument should be returned to the manufacturer, Michell
Instruments, or one of their accredited service agents for re-calibration (go to www.michell.com for
contact information).
Safety Conformity
This product meets the essential protection requirements of the relevant EU directives. Refer to
Appendix A - Technical Specifications - for details.

S8000 Integrale User’s Manual
Michell Instruments ix
Abbreviations
The following abbreviations are used in this manual:
DCC Dynamic Contamination Correction
FAST Frost Assurance System Technology
MAXCOOL Maximum Sensor Cooling
AC alternating current
atm pressure unit (atmosphere)
barg pressure unit (=100 kP or 0.987 atm) gauge
bara pressure unit (absolute)
°C degrees Celsius
°F degrees Fahrenheit
COM common
dp dew point
EU European Union
g/Kg grams per kilogram
g/m3grams per cubic meter
HMI Human Machine Interface
Hz Hertz
IEC International Electrotechnical Commission
Nl/min normal liters per minute
lb pound
mA milliampere
max maximum
min minute(s)
mV millivolt(s)
N/C normally closed
N/O normally open
No number
ppmV parts per million (by volume)
ppmW parts per million (by weight)
PRT Platinum resistance thermometer (typically type Pt100)
psig pound(s) per square inch (gauge)
psia pound(s) per square inch (absolute)
RH relative humidity
RTU Remote Terminal Unit
scfh standard cubic feet per hour
SD storage device card (memory card for storing datalog files)
temp temperature
USB Universal Serial Bus
V Volts
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.
DANGER
Electric
Shock Risk
Where this symbol appears in the following sections it is
used to indicate areas of potential risk of electric shock.

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S8000 Integrale User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The S8000 Integrale is a high precision instrument used for the measurement of moisture
content in air and other gases. Relative humidity and other calculated parameters based
on dew point, pressure and temperature of the sample gas can also be displayed.
The S8000 Integrale is capable of measuring dew points as low as -60°C (-76°F); it
can measure dew points up to (but not including) the point of condensation (maximum
+40°C (+104°F)).
Four models of the S8000 Integrale instrument are available:
• Vertical model
• Low Pressure (1 barg (14.5 psig) max)
• High Pressure (17 barg (250 psig) max)
• Horizontal model
• Low Pressure (1 barg (14.5 psig) max)
• High Pressure (17 barg (250 psig) max)
A rack mounted configuration is available which is a derivative of the horizontal model.
Any horizontal model may be converted to a rack mounted version by means of a special
rack mounting kit, (refer to Section 2.5.8).
Water Content
Pressure
Dewpoint °C
°C
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
dp
Figure 1 S8000 - Horizontal Model

S8000 Integrale User’s Manual
297102 Issue 9.4, March 2016
INTRODUCTION
1.1 Operating Principle
The system operates on the chilled mirror principle, whereby a gas sample is passed
into the sensor housing and flows over the surface of the chilled mirror contained
within. At a temperature dependent upon the moisture content in the gas, and the
operating pressure, the moisture in the gas condenses out on the surface of the mirror.
An optical system is used to detect the point at which this occurs, and this information
is used to control the mirror temperature and maintain a constant thickness of the
condensation layer on the mirror surface.
A light emitting diode (1) (see
Figure 2) provides a light beam of constant intensity
which is focused by a lens system (2) to become the incident beam on the mirror
surface (3), flooding it with a pool of light.
Before the light beam reaches the mirror (3), a beam splitter (4) directs part of the
beam via a lens system (5) onto a sensor (6) which monitors the intensity of the LED
light and provides a feedback loop to keep this at a constant level.
Two sensors (7 and 8) monitor the light level reflected by the mirror. One of these
sensors (7) measures the light level due to the reflected incident beam and the other
(8) measures the degree of light scatter due to the formation of water/ice on the mirror
surface. Each sensor has its own optical lens system (9) and (10) to concentrate the
reflected light onto the sensor.
The output from each of these sensors is compared and then used to control the drive
to a Peltier heat pump (11). Dependant on the result of this comparison, the control
system will cause the heat pump (11) to either heat or cool the mirror (3) in order to
maintain the desired condensation film thickness on the mirror surface.
At an equilibrium point, where the evaporation rate and condensation rate at the surface
of the mirror are equal, the mirror temperature, read by a Pt100 platinum resistance
thermometer (12) embedded in the mirror, represents the dew point.

S8000 Integrale User’s Manual
Michell Instruments 3
INTRODUCTION
6
5
1
947
8
2
3
11
10
12
Figure 2 Operating Principle

S8000 Integrale User’s Manual
497102 Issue 9.4, March 2016
INSTALLATION
2 INSTALLATION
2.1 Safety
!
It is essential that the installation of the electrical and gas
supplies to this instrument be undertaken by competent
personnel.
2.2 Unpacking the Instrument
Both the horizontal and vertical models are packed in a similar manner. Figure 3 shows
the unpacking method.
NOTE: The free-standing, horizontal version may be converted to a rack
mounted instrument by means of an optional rack mounting kit (refer to
Section 2.5.8).
23
4
5
1
Figure 3 S8000 Integrale Packing

S8000 Integrale User’s Manual
Michell Instruments 5
INSTALLATION
Open the box and unpack carefully as follows (see Figure 3) :
1. Remove the accessories box (4).
2. Lift out the instrument (2) together with its end packing pieces (1) and
(3).
3. Remove the end packing pieces (1) and (3) set the instrument down at
the site of installation.
4. Save all the packing materials for the purpose of returning the instrument
for re-calibration or any warranty claims.
The accessories box should contain the following items (refer to
Figure 4):
1. Traceable calibration certificate
2. SD memory storage card
3. Optics cleaning kit
4. Microscope (optional)
5. USB communications cable
6. Pt100 temperature probe (optional)
7. IEC power cable
8. Application software CD
9. User’s manual
10. Safety strap (supplied with High Pressure versions)
If there are any shortages, please notify Michell Instruments immediately
(see www.michell.com for contact information).
WaterContent
Pressure
Dewpoint °C
°C
Bara
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
gm3
dp
WaterContent
Pressure
Dewpoint °C
°C
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
dp
4
5
6
9
78
3
10
1
2
Figure 4 S8000 Accessories

S8000 Integrale User’s Manual
697102 Issue 9.4, March 2016
INSTALLATION
2.3 Operating Requirements
2.3.1 Environmental Requirements
The horizontal and vertical S8000 instruments should be placed on a firm and level
surface in a standard laboratory environment. Recommended ambient temperature +20
to +25°C (+68 to +77°F) although the instrument will operate, within specification, at
elevated ambient temperatures of up to +50°C (+122°F), providing the cooling vents are
kept clear and unrestricted. It is essential however that this upper temperature
limit (+50°C (+122°F)) is not exceeded.
A free flow of air around the instrument is required at all times.
Rack mounted versions are suitable for mounting in standard 19" racks. The siting
of these racks should be in a dry, dust free environment at a recommended ambient
temperature of +20 to +25°C (+68 to +77°F).
!
For rack mounted instruments, forced air cooling of the
rack should be considered if operating at high ambient
temperatures.
2.3.2 Electrical Requirements
All versions of the instrument require the following electrical supply:
• 85 to 264 V AC, 47/63 Hz, 100 VA max
• Alarm outputs for all instrument types comprise two sets of changeover relay
contacts, one set for a PROCESS alarm and one set for an INSTRUMENT
FAULT. Both sets of contacts are rated at 24 V, 1A. NOTE: THIS RATING
MUST NOT BE EXCEEDED.

S8000 Integrale User’s Manual
Michell Instruments 7
INSTALLATION
2.4 Exterior Layout
The controls and indicators relating to the operator interface are located on the front
panel, along with the gas inlet and outlet.
The external PRT connection, mains power IEC socket, analog output connector, remote
temperature probe connector, alarm relay connector, and the USB socket are located on
the rear panel.
Figures 5 and 6 show the layout of these controls for both the rack mount/horizontal
and vertical versions of the instrument. Tables 1 and 2 detail the controls and indicators
and the function key operations.
!
The microscope should not be used when the system is
operating at pressures above 1 barg (14.5 psig).
!
The safety strap should be fitted when the the system is
operating at pressures above 1 barg (14.5 psig) (see Section
2.5.10).

S8000 Integrale User’s Manual
897102 Issue 9.4, March 2016
INSTALLATION
Front Panel
Water Content
Pressure
Dewpoint °C
°C
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
dp
345621
Water Content
Pressure
Dewpoint °C
°C
Bara
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
gm
3
dp
Water Content
Pressure
Dewpoint °C
°C
Status
Duration
Process
Fault
Sensor
OFF
CONTROL
ON
00:14:22
MEASURE
0.1
dp
1a
2
3
4
56
Figure 5
Front Panel
Item Description
1Microscope - For viewing mirror surface. The microscope is removable and
must not be used at pressures above 1 barg (14.5 psig).
1a Safety Strap - Must be fitted when the system is operating at pressures above
1 barg (14.5 psig). Refer to Section 2.5.10.
2Exterior housing of the sensor - See Section 5.4 for instructions on how to
open the housing and clean the mirror.
3
Instrument display - Partitioned to show three main panes each of which can
be configured to display one of the ten available output parameters. A second
area of the display shows a stability graph, and other process related data. Refer
to Section 3.3.
4Function keys - Used to control the instrument functions and navigate through
the menu system. Refer to Section 2.2.
5Gas input port - Usually slightly above atmospheric pressure in order to maintain flow rate over the mirror, but can be at elevated pressure depending
upon application.
6Gas output port - Usually vented to atmosphere but can be at elevated
pressures depending upon application.
Table 1 Front Panel Controls and Indicators

S8000 Integrale User’s Manual
Michell Instruments 9
INSTALLATION
Rear Panel
78910
11 12 1413
11
12
13
14
7
8
9
10
Figure 6 Rear Panel
Item Description
7
Analog output connector - Three, 2-wire output channels, CH1, CH2 and
CH3, each of which may be configured to give either a 0-20 mA or a 4-20 mA
current loop output or a 0 to 1000 mV voltage signal representing any one of the
measured or calculated output parameters selected.
Spans for each signal output are separately configurable. Refer to Section 2.5.2.
8Remote temperature probe (optional) - 6-Pin Lemo socket for connection
of remote Pt100 temperature probe.
9
Alarms - Process and Fault alarm outputs. Each alarm has one set of potential
free, changeover, relay contacts, common (COM), normally closed (N/C) and
normally open (N/O).
The Process alarm can be configured to operate at a specified level on any of the
measured or calculated parameters. Refer to Section 2.5.3.
10 USB communications port - Used for connection to an external computer
system for running application software (optional).
11-13 IEC Power supply input socket and power ON/OFF switch - Universal power input 85 to 264 V AC, 47/63 Hz / Fuse - 2.5 A, Anti-Surge, Glass, 20mm
x 5mm (12) / Features integrated power ON/OFF switch (13).
14
4-wire PRT bridge output - Banana sockets for external 4-wire measurement
of the internal PRT. Active only when PRT set to External from Display options,
and instrument is in the MEASURE phase. In this mode the dew-point display is
set to read zero, DCC is set to OFF and manual DCC is also disabled.
Table 2 Rear Panel Controls and Indicators

S8000 Integrale User’s Manual
10 97102 Issue 9.4, March 2016
INSTALLATION
2.5 Rear Panel Connections (All Versions)
!
These tasks should be undertaken only by competent
personnel.
DANGER
Electric
Shock Risk
All the connections to the rear panel are electrical
connections.
Exercise due caution, particularly when connecting to
external alarm circuits which could be at high potential.
Connections to the rear panel of the instrument are explained in the following sections.
2.5.1 Power Supply Input
The AC power supply is a push fit into the power input socket as shown in Figure 7 . The
method of connection is as follows:
1
2
3
1. Ensure that both ends of the
power cable are potential free
i.e. not connected to an AC
power supply.
2. Check that the ON/OFF switch
(1) on the power supply
connector is switched to OFF.
3. Push the IEC connector (2) firmly
into the power input socket (3).
4. Connect the free end of the
power cable to a suitable AC
power supply source (voltage
range 85 to 264 V AC, 47/63 Hz)
and switch on the AC supply.
The instrument may then be
switched on, as required, using
the ON/OFF switch.
Figure 7
Power Supply Input