Michell Instruments S8000-RS Operating Manual
S8000 RS
Chilled Mirror Hygrometer
User’s Manual
97315 Issue 9
April 2019
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S8000 RS
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© 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.
S8000 RS User’s Manual S8000 RS User’s Manual
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 Operating Principle ............................................................................................. 1
2 INSTALLATION ..................................................................................................3
2.1 Safety ................................................................................................................ 3
2.2 Unpacking the Instrument ................................................................................... 3
2.3 Transportation Clamp Removal ............................................................................ 4
2.4 Operating Requirements ..................................................................................... 5
2.4.1 Environmental Requirements ......................................................................... 5
2.4.2 Electrical Requirements ................................................................................. 5
2.5 Exterior Layout ................................................................................................... 6
2.6 Rear Panel Connections ...................................................................................... 8
2.6.1 Power Supply Input ....................................................................................... 8
2.6.2 Analog Output Connections ............................................................................ 9
2.6.3 Alarm Output Connections ........................................................................... 11
2.6.4 Remote PRT Probe ..................................................................................... 12
2.6.5 USB/Ethernet Communications Port Connector .............................................. 13
2.6.6 RS232/485 Port (optional) ........................................................................... 14
2.7 Conversion of S8000 RS to Rack Mount ............................................................. 15
2.7.1 Fitting Rack Mounted Version into Rack ........................................................ 16
3 OPERATION ....................................................................................................17
3.1 General Operational Information ........................................................................ 17
3.1.1 Sample Flow Adjustment ............................................................................. 17
3.2 Start-up procedure when measuring in flammable gases ..................................... 18
3.3 Instrument Display ........................................................................................... 18
3.3.1 Main Screen ................................................................................................ 19
3.3.2 Customizable Readouts................................................................................ 20
3.3.3 Operational Status Display ........................................................................... 21
3.3.4 Cooler Set up .............................................................................................. 22
3.3.5 Setup Menu Screen ..................................................................................... 23
3.3.6 Menu Structure .......................................................................................... 25
3.3.7 DCC ........................................................................................................... 26
3.3.8 LOGGING ................................................................................................... 27
3.3.9 OUTPUTS ................................................................................................... 29
3.3.10 ALARM ....................................................................................................... 29
3.3.11 DISPLAY .................................................................................................... 30
3.3.12 CLOCK ....................................................................................................... 31
3.3.13 ABOUT (Network Settings) ........................................................................... 31
3.4 Operational Functions ....................................................................................... 32
3.4.1 Operating Cycle .......................................................................................... 32
3.5 Operating Guide ............................................................................................... 33
3.5.1 Automatic Mode .......................................................................................... 33
iv 97315 Issue 9, April 2019
3.5.1.1 Description ........................................................................................... 33
3.5.1.2 Operating Practice ................................................................................. 33
3.5.1.3 Flood Recovery ..................................................................................... 34
3.6 Manual Mode ................................................................................................... 34
3.6.1 Description ................................................................................................. 34
3.6.1.1 Operating Practice ................................................................................. 34
3.6.2 DCC - Dynamic Contamination Control .......................................................... 35
3.6.3 MAXCOOL Function ..................................................................................... 36
3.6.4 Pressure Input ............................................................................................ 36
3.6.5 Data Logging .............................................................................................. 36
3.6.6 Frost Assurance System Technology (FAST) .................................................. 37
3.6.7 STANDBY Mode........................................................................................... 37
4 APPLICATION SOFTWARE ................................................................................38
4.1 Installation ....................................................................................................... 38
4.2 Establishing Communications ............................................................................ 38
4.2.1 USB Communication .................................................................................... 39
4.2.2 Ethernet 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 Fuse Replacement ........................................................................................... 46
5.2 Sensor Mirror Cleaning ...................................................................................... 48
6 GOOD MEASUREMENT PRACTICE .....................................................................49
6.1 Sampling Hints ................................................................................................. 49
7 CALIBRATION ..................................................................................................52
7.1 Traceability ...................................................................................................... 52
Tables
Table 1 Front Panel Controls ....................................................................................6
Table 2 Rear Panel Connections ...............................................................................7
Table 3 Main Screen Description ............................................................................. 20
Table 4 Operational Status Display ........................................................................ 21
Table 5 Cooler Setup Parameters ............................................................................22
Table 6 Cooler Alarm Warnings .............................................................................. 22
Table 7 DCC Parameters ........................................................................................ 26
Table 8 Logging Parameters ................................................................................... 27
Table 9 SD Card Status Indicators ..........................................................................28
Table 10 Outputs Parameters ................................................................................... 29
Table 11 Alarm Parameters ......................................................................................29
Table 12 Display Parameters ....................................................................................30
Table 13 Clock Parameters .......................................................................................31
Table 14 Network Parameters ..................................................................................31
Table 15 Data Acquisition Control Description ...........................................................42
Table 16 Graph Control Description ..........................................................................43
Table 17 Status Bar Description ...............................................................................43
Table 18 Default Set-Up Parameters .........................................................................58
Table 19 Register Map ............................................................................................. 62
Michell Instruments v
S8000 RS User’s Manual S8000 RS User’s Manual
Figures
Figure 1 Operating Principle .......................................................................................... 2
Figure 2 Rear clamp ..................................................................................................... 4
Figure 3 Front clamp .................................................................................................... 5
Figure 4 Front Panel ..................................................................................................... 6
Figure 5 Rear Panel ...................................................................................................... 7
Figure 6 Power Supply Input ......................................................................................... 8
Figure 7 Alarm and Analog Output Connection ............................................................. 10
Figure 8 Remote PRT Connection ................................................................................ 12
Figure 9 USB Port Connection ..................................................................................... 13
Figure 10 Ethernet Port ................................................................................................ 13
Figure 11 RS232/485 Port (optional) ............................................................................. 14
Figure 12 Conversion to Rack Mount ............................................................................. 15
Figure 13 Initialising Overlay Screen .............................................................................. 18
Figure 15 Main Screen Layout ....................................................................................... 19
Figure 14 Main Screen .................................................................................................. 19
Figure 16 Cooler Setup Screen ...................................................................................... 22
Figure 17 Setup Menu Screen ....................................................................................... 23
Figure 18 Virtual Keyboard .......................................................................................... 24
Figure 19 Menu Structure ............................................................................................. 25
Figure 20 DCC Screen .................................................................................................. 26
Figure 21 Logging Screen ............................................................................................. 27
Figure 22 Outputs Screen ............................................................................................. 29
Figure 23 Alarm Screen ................................................................................................ 29
Figure 24 Display Screen .............................................................................................. 30
Figure 25 Clock Screen ................................................................................................. 31
Figure 26 Network Settings Screen ................................................................................ 31
Figure 27 Typical Operating Cycle .................................................................................. 32
Figure 28 Communications Setup Screen ....................................................................... 38
Figure 29 Windows Device Manager Screen ................................................................... 39
Figure 30 Network Settings Screen ................................................................................ 40
Figure 31 Options Screen ............................................................................................. 41
Figure 32 Data Acquisition Screen ................................................................................. 42
Figure 33 Variables Editor Screen .................................................................................. 45
Figure 34 Fuse Replacement ......................................................................................... 46
Figure 35 Sensor Mirror Cleaning .................................................................................. 48
Figure 36 Material permeability comparison ................................................................... 49
Figure 37 Typical Calibration Certificate ......................................................................... 52
Figure 38 Operational Range......................................................................................... 55
Figure 39 S8000 RS Dimensions .................................................................................... 55
Appendices
Appendix A Technical Specifications ...................................................................................54
Appendix B Default Set-Up Parameters ...............................................................................58
Appendix C Modbus Holding Register Map ..........................................................................60
Appendix D Quality, Recycling & Warranty Information ........................................................68
Appendix E Analyzer Return Document & Decontamination Declaration ................................70
vi 97315 Issue 9, April 2019
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 safe working pressure is 10 barg (145 psig). Refer to Appendix A - Technical Specifications.
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.
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 RS 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. Further
details of applied standards may be found in the product specification.
Michell Instruments vii
Abbreviations
!
DANGER
Electric
Shock Risk
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)
bar pressure unit (=100 kP or 0.987 atm)
°C degrees Celsius
°F degrees Fahrenheit
COM common
dp dew point
EU European Union
g/kg grams per kilogram
g/m3 grams 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)
rh relative humidity
RTU Remote Terminal Unit
scfh standard cubic feet per hour
SD storage device card (memory card for storing datalog files)
sec second(s)
temp temperature
USB Universal Serial Bus
V Volts
S8000 RS User’s Manual S8000 RS User’s Manual
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.
viii 97315 Issue 9, April 2019
1 INTRODUCTION
The S8000 RS 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. Gases
can be sampled at a maximum pressure of 10 barg (145 psig).
The S8000 RS is capable of measuring dew points as low as -80°C or -90°C (-112°F or
-130°F) (depending on the model - RS80 or RS90); it can measure dew points up to
(but not including) the point of condensation.
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.
INTRODUCTION
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) 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 on 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.
Michell Instruments 1
INTRODUCTION
The ‘hot’ side of the Peltier is coupled to an auxiliary cooling system through a thermal
mass (13) – which smooths its response. The cooling system removes heat from the
hot side of the Peltier, by cooling it to an appropriate temperature. This supplements
the depression capabilities of the heat pump, and enables measurement of very low
dew points.
5
6
S8000 RS User’s Manual S8000 RS User’s Manual
94 7
1
11
2
3
Figure 1
8
10
12
13
Operating Principle
2 97315 Issue 9, April 2019
2 INSTALLATION
!
2.1 Safety
It is essential that the installation of the electrical and gas
supplies to this instrument be undertaken by competent
2.2 Unpacking the Instrument
The S8000RS is a heavy instrument and should be unpacked by two people. Carefully
open the crate and check for any signs of transit damage before touching the instrument.
Remove the accessories before touching the instrument.
Carefully lift the unit out holding the case and not the foam as these may become loose
and allow the instrument to fall.
Ensure one person has a good grip of the unit whilst the other removes the foam
protectors:
INSTALLATION
personnel.
Save all the packing materials for the purpose of returning the instrument for
re-calibration or any warranty claims.
Failure to return the instrument in the original packing, or failure to return the instrument
with the transit clamp fitted may result in warranty claims being denied.
Michell Instruments 3
INSTALLATION
The accessories crate should contain the following items:
• Traceable calibration certificate
• SD memory storage card
• USB or Ethernet communications cable
• IEC power cable
• Microscope
• Remote Pt100 temperature probe (optional)
• Optics cleaning kit (optional)
• 19" Rack mount kit (optional)
• Transport case (optional)
If there are any shortages please notify the supplier immediately.
S8000 RS User’s Manual S8000 RS User’s Manual
2.3 Transportation Clamp Removal
Prior to powering the instrument on, the transportation clamps must be removed. There
are two separate clamps:
1. Rear clamp
Carefully place the instrument on its side, with the sensor head side down.
As per Figure 3, there are two slots machined into the outer case. A bolt will be visible
through each.
Figure 2
Use a 5mm Allen key to loosen each bolt (do not try to remove them) and slide them
into the forward position in the slots. Re-tighten the bolts in this position so they cannot
move around.
Carefully place the instrument back onto its base.
Rear clamp
4 97315 Issue 9, April 2019
INSTALLATION
2. Front clamp
As per Figure 4, use a 3mm Allen key to remove the 2 bolts on either side of the front
clamp. Keep these bolts safe for future use.
Remove the microscope cover. The front clamp should now slide away from the
instrument.
2.4 Operating Requirements
2.4.1 Environmental Requirements
It is important to operate the S8000 RS within the following environmental conditions:
Minimum Operating Temperature 5°C
Maximum Operating Temperature 30°C
Maximum Relative Humidity 80%
2.4.2 Electrical Requirements
Figure 3
Front clamp
The S8000 RS requires the following electrical supply:
• 85 to 264 V AC, 47/63 Hz, 250 VA max
• Alarm outputs 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.
Michell Instruments 5
INSTALLATION
2.5 Exterior Layout
The controls, indicators and connectors associated with the S8000 RS are located on
the front and rear panels of the instrument.
The controls and indicators relating to the operator interface are located on the front
panel. The gas outlet, gas inlet, external PRT connection, mains power IEC socket,
analog output connector, remote temperature probe connector, alarm relay connector,
and the USB/RJ45 Ethernet socket are located on the rear panel.
Front Panel
S8000 RS User’s Manual S8000 RS User’s Manual
2
1
Figure 4
No Name Description
Takes an SD card used to store logged data
1 SD Card Slot
2
3 Sensor Housing
Touch Screen
Display
See Section 3.2.8 for more details on how to use the logging
features
Displays measured values and enables the user to control the
operation of the instrument
See Section 3.2 for information about the touch screen and
menu system
Exterior housing of the sensor
See Section 5.2 for instructions on how to remove the housing
and clean the mirror
3
Front Panel
Table 1
Front Panel Controls
6 97315 Issue 9, April 2019
Rear Panel
INSTALLATION
Figure 5
No. Name Description
1
2
3
4
¼” Swagelok
Gas Outlet
¼” VCR Gas
Inlet
External PRT
Connection
Mains power
IEC Socket
6-Way
5
Analog
Output
Connector
Remote
6
Temperature
Probe
Connector
6-Way
7
Alarm Relay
Connector
RJ45
8
Ethernet
Socket
(Optional)
9 USB Type B
Connection for venting sample gas to atmosphere or vent line once it
has passed through the instrument
Connection for supplying the instrument with sample gas, usually at
a pressure slightly higher than atmospheric to maintain flow through
the instrument
Banana sockets for external 4-wire measurement of the internal PRT
See Section 3.2.11 for more info
Universal power input 85 to 264 V AC, 47/63 Hz
Fuse - 3.15 A, Anti-Surge, Glass, 20mm x 5mm
Features integrated power ON/OFF switch
Three configurable 2-wire channels providing 0-20 mA,
4-20 mA or 0 - 1 V output. The 0/4-20mA outputs are active (sourcing)
and must be connected to a passive (sinking) input on the receiving
equipment.
See Section 3.2.9 for instructions on how to configure the analog
outputs
See Section 2.5.2 for general information
6-Pin Lemo socket for connection of remote Pt100 temperature probe
Process and Fault alarm outputs
See Section 2.5.3 for general information on the alarm relays
See Section 3.2.10 for instructions on how to configure the process
alarm
Used for communication with the instrument over a network
connection
See Section 3.2.13 for details on how to configure the network settings
See Section 4.1 for information on using and installing the application
software
Used for communication with the instrument via the application
software
See Section 4.1 for information on using and installing the application
software
1 2
3
8
9
7
Rear Panel
4
6
5
Table 2
Rear Panel Connections
Michell Instruments 7
INSTALLATION
!
DANGER
Electric
Shock Risk
2.6 Rear Panel Connections
These tasks should be undertaken only by competent
All the connections to the rear panel are electrical
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.
2.6.1 Power Supply Input
S8000 RS User’s Manual S8000 RS User’s Manual
personnel.
connections.
The AC power supply is a push fit into the power input socket as shown in
method of connection is as follows:
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) is switched to OFF.
3. Push the IEC connector (3) firmly into the power input socket (2).
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. Switch on the instrument, as required, using the
power ON switch.
Figure 7.
The
Figure 6
Power Supply Input
8 97315 Issue 9, April 2019
2.6.2 Analog Output Connections
The three analog outputs can be configured to represent any of the directly measured
or calculated output parameters. They are provided as 2-wire signals from a 6-way
connector located on the rear panel of the instrument
Each of these outputs can be set up as either a current loop signal (4-20 mA or 0-20 mA)
or alternatively, as a 0-1 V voltage signal. The 0/4-20mA outputs are active (sourcing)
and must be connected to a passive (sinking) input on the receiving equipment. The
configuration of these outputs, i.e. parameter represented, output type (current loop
or voltage) and upper/lower span levels are set up via the Setup Menu Screen (refer to
Section 3.2.9).
These signals may be used to control external systems. During a DCC cycle, and for
the hold period following a DCC cycle, they are held at the level that they were at
immediately prior to the start of the cycle. When the dew-point measurement is stable,
or if the maximum hold period has expired, they are released and will track the selected
parameter throughout the measurement cycle.
The default settings of these analog outputs are:
INSTALLATION
.
Channel 1: Dew point, -80 to +20ºC
Channel 2: ppmV, 0 to 3000
Channel 3: Flow, 0 to 1000ml/min
NOTE: The analog outputs are only active during the MEASURE phase. They
will, therefore, be off after switch-on and remain off until the system enters
the MEASURE phase.
The three analog output ports connections are made via a single, 6-way, push fit
connector block as shown in
referenced to a common 0 V line. To differentiate between the outputs it is recommended
that a black lead be used for each of the COM (common) lines and a separate color for
each of the positive lines.
Figure 8
. All outputs are 2-wire, positive-going signals
Michell Instruments 9
INSTALLATION
For each output:
1. Remove the terminal block fitted into the analog output socket.
2. Strip back the wire for the common (black) connection to the
CH1 output, exposing approximately 6mm (0.25"). Insert the wire
into the COM1 terminal way and screw into the block. Do not
overtighten the screw.
3. Strip back the wire for the signal (e.g. red) connection to the
OP1 output, exposing approximately 6mm (0.25"). Insert the
wire into the OP1 terminal way and screw into the block. Do not
overtighten the screw.
4. Repeat operations 1 and 2 for the other analog outputs, selecting a
different color wire for the OP2 and OP3 outputs.
5. Locate the terminal block over the connector labelled ANALOG
OUTPUTS and push the terminal block firmly into the connector.
S8000 RS User’s Manual S8000 RS User’s Manual
Figure 7
Alarm and Analog Output Connection
10 97315 Issue 9, April 2019
2.6.3 Alarm Output Connections
DANGER
Electric
Shock Risk
Two alarm outputs are provided from a terminal block, located on the rear panel of
the instrument, as two pairs of potential free, change-over relay contacts. These are
designated as a PROCESS alarm and a FAU LT alarm.
Under the Setup Menu Screen, (refer to Section 3.2.5), the PROCESS alar m can be config ured
to represent any one of the measured or calculated parameters and set up to operate when
a pre-set parameter threshold level is exceeded. By default, the PROCESS alarm is set to
monitor the dew-point parameter.
The FAU LT alarm is a non-configurable alarm which continuously monitors the degree
of contamination of the chilled mirror. During normal operational conditions, this alarm
will be off. If the optics or the mirror contamination exceeds 100% of the film thickness,
or if a fault exists on the Pt100, the alarm is triggered and the relay contacts will change
state.
This fault is also reported to the status area of the Main Screen.
The two alarm output ports are connected to the instrument via a single 6-way, push-fit
connector block as shown in
free, change-over relay contacts.
Figure 8
INSTALLATION
. Each output comprises a 3-wire set of potential
Each contact set is labelled COM (common 0 V), N/O (normally open with respect to
COM) and N/C (normally closed with respect to COM).
To differentiate between the alarm output channels, it is recommended that a black lead
is used for each of the COM (common) lines and a separate color for each of the N/O
and N/C lines.
WARNING: Alarm leads MUST be potential free when wiring
to the connector block. Both sets of contacts are rated at 24
V, 1A. THIS RATING MUST NOT BE EXCEEDED.
For each output:
1. Strip back the wire for the common (black) connection to the
COM connector way for the FAU LT alarm contact set, exposing
approximately 6mm (0.25") wire. Clamp into the screw block COM
terminal way. Do not overtighten the screw.
2. Strip back the wire for the N/O (e.g. green) connection to the
N/O connector way for the FAU LT alarm contact set, exposing
approximately 6mm (0.25") wire. Clamp into the screw block N/O
terminal way. Do not overtighten the screw.
3. Strip back the wire for the N/C (e.g. blue) connection to the
N/C connector way for the FAULT alarm contact set, exposing
approximately 6mm (0.25") wire. Clamp into the screw block N/C
terminal way. Do not overtighten the screw.
Michell Instruments 11
INSTALLATION
4. Repeat operations 1 to 3 for the PROCESS alarm contact set, using
appropriately colored wires.
5. Locate the terminal block over the connector labelled ALARMS and
push the terminal block firmly into the connector.
2.6.4 Remote PRT Probe
1. Rotate the body of the PRT probe connector until it locates in the
socket labeled REMOTE TEMPERATURE (see
2. Push the connector into the socket until it locks. NOTE: Do not
attempt to force it into the socket. If it does not fit in, rotate
it until the key locks and it pushes in easily.
3. To remove the connector, slide the connector’s body collar (1) back
along its axis, away from the instrument, to release the lock. Gently
pull the connector body out of the socket. NOTE: Do not attempt
to pull the connector out with the cable - make sure that
the collar is first released.
S8000 RS User’s Manual S8000 RS User’s Manual
Figure 9).
Figure 8
Remote PRT Connection
12 97315 Issue 9, April 2019
2.6.5 USB/Ethernet Communications Port Connector
CH1
GND
CH2
GND
CH3
GND
ANALOGUE OUTPUTS
LAN
REMOTE SENSOR MEASUREMENT
CALIBRATION CURRENT = 1mA
PT100
1 2 3 4
1
The instrument features a USB port and an optional Ethernet port for communication
with the application software. The appropriate cable will be supplied with the instrument.
1. Check the orientation of the connector and gently push it into the
communications socket (see
Figures 10 and 11)
2. To remove the connector, pull it out of the socket by holding the
connector body. If using an Ethernet cable there will be a small
locking tab that needs to be depressed in order to release the
connector. Do not attempt to remove the connector from the
socket by pulling on the cable.
ALARMS
FAULT PROCESS
USB
N/C
ON
OFF
N/O
COM
COM
.
REMOTE
TEMPERATURE
INSTALLATION
Figure 9
ALARMS
FAULT PROCESS
USB
N/C
N/O
Figure 10
COM
USB Port Connection
LAN
REMOTE
TEMPERATURE
ON
OFF
COM
Ethernet Port
ANALOGUE OUTPUTS
CH1
CH2
GND
GND
CH3
GND
USB Connection
The application software includes a virtual serial port driver allowing the customers own
software to be used with the device. The communications protocol used is Modbus RTU.
Refer to Appendix C for the Modbus register map.
Ethernet Connection
Appendix C for the Modbus register map.
Michell Instruments 13
The communication protocol used with the Ethernet port is Modbus TCP. Refer to
INSTALLATION
N/C
N/O
COM
OFF
ON
COM
CH1
GND
CH2
GND
CH3
GND
ALARMS
FAULT PROCESS
ANALOGUE OUTPUTS
REMOTE
TEMPERATURE
RS232
USB
REMOTE SENSOR MEASUREMENT
CALIBRATION CURRENT = 1mA
PT100
1 2 3 4
1
5
2.6.6 RS232/485 Port (optional)
The instrument features an optional RS232/485 port for communication with the
application software. This is designed to be used with a standard 9-pin D-sub connector.
The communications protocol used is Modbus RTU. Refer to Appendix C for the Modbus
register map.
1. Check the orientation of the connector and gently push it into the
socket labelled RS232 or RS485, and tighten the retaining screws.
S8000 RS User’s Manual S8000 RS User’s Manual
Figure 11
RS232/485 Port (optional)
2. Loosen the retaining screws, and pull the connector out of the
socket by holding the connector body.
RS232
Pin 2 TXD
RS232 Pinout (9-pin female)
Pin 1
Pin 5
Pin 3 RXD
Pin 5 GND
RS485
Pin 3 A
Pin 6
RS485 Pinout (9-pin female)
Pin 1
Pin 9
Pin 5
Pin 5 GND
Pin 8 B
Pin 6
Pin 9
14 97315 Issue 9, April 2019
2.7 Conversion of S8000 RS to Rack Mount
!
To convert an S8000 RS to a rack mounted version, a rack mounting kit (Part No.
S8K401-PKI) is required. This conversion pack comprises two steel wings and four rack
mounting screws and washers. Each wing bolts to the side of the instrument with four
screws (already in the instrument) as shown in
Figure 13.
INSTALLATION
Figure 12
1. Turn the unit on its left hand end and remove the four screws and
washers from the side panel.
2. Line up the fixing holes on the right hand side of the instrument
with the corresponding holes in the right hand wing (flange facing
outwards).
3. Insert the four screws and washers through the wing and tighten
finger tight.
4. Ensure that the front flange is square to the front of the instrument
and tighten the screws.
5. Turn the unit on its right hand end and repeat operations 1 to 4.
To remove the rack support wings remove the unit from the rack (if necessary) and
follow the directions above, in reverse.
NOTE: The rack mounting wings are designed to hold the
unit into the rack, not to support its full weight.
The instrument should be placed onto a shelf or rails
Conversion to Rack Mount
Michell Instruments 15
INSTALLATION
2.7.1 Fitting Rack Mounted Version into Rack
1. Remove the connector blocks from the alarm and analog output
sockets.
2. If necessary, remove any covers from the rack cabinet to gain
access to the rear and side.
3. Connect up the analog and alarm output connector blocks to
the internal rack wiring (refer to Section 2.5.2 & Section 2.5.3),
ensuring that there is sufficient free cable to permit withdrawal of
the instrument from the rack.
4. Slide the instrument into the rack and onto the correctly positioned
shelf or rails. Insert the four rack mounting screws and washers.
5. Ensure that the front panel of the instrument is flush and square
with the front of the rack and tighten the fixing screws.
6. Connect the sample pipework to the gas inlet, and the vent line to
the gas outlet, as required.
S8000 RS User’s Manual S8000 RS User’s Manual
7. Insert the analog and alarm connectors into their respective sockets
on the rear of the instrument (refer to
external PRT probe and USB communications cable and connector
as appropriate.
8. Connect the power supply cable and switch the ON/OFF switch to
Figure 8)
and connect the
ON.
9. Refit any covers to the rack as necessary.
To remove from the rack follow the directions above, in reverse.
16 97315 Issue 9, April 2019
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