PST MITCHELL S8000 -100 User manual

S8000 -100
Chilled Mirror Hygrometer
User Manual
97606 Issue 1
June 2021

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© 2021 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
S8000 -100

S8000 -100 User Manual
iv 97606 Issue 1, June 2021
1 INTRODUCTION ................................................................................................1
1.1 Operating Principle ............................................................................................. 1
2 INSTALLATION ..................................................................................................3
2.1 Safety ................................................................................................................ 3
2.2 Unpacking the Instrument ................................................................................... 3
2.3 Transit Bolts ....................................................................................................... 4
2.4 Operating Requirements ..................................................................................... 5
2.4.1 Environmental Requirements ......................................................................... 5
2.4.2 Electrical Requirements ................................................................................. 5
2.4.2.1 Front Panel ............................................................................................. 6
2.4.2.2 Rear Panel Connections ........................................................................... 7
2.4.3 Power Supply Input ....................................................................................... 8
2.4.4 Microscope installation .................................................................................. 9
2.4.5 Analog Output Connections .......................................................................... 10
2.4.6 Alarm Output Connections ........................................................................... 11
2.4.7 Remote Temperature Probe ........................................................................ 11
2.4.8 Remote Pt100 connections ........................................................................... 12
2.4.9 USB Communications Port Connector ............................................................ 12
2.4.10 Ethernet/RS232/RS485 Port (optional) .......................................................... 13
3 OPERATION ....................................................................................................14
3.1 General Operational Information ........................................................................ 14
3.1.1 Sample Flow Adjustment ............................................................................. 14
3.2 Operational Functions ....................................................................................... 15
3.2.1 Operating Cycle .......................................................................................... 15
3.3 Operating Guide ............................................................................................... 16
3.3.1 Automatic Mode .......................................................................................... 16
3.3.1.1 Description ........................................................................................... 16
3.3.1.2 Operating Practice ................................................................................. 17
3.3.1.3 Flood Recovery ..................................................................................... 17
3.4 Manual Mode ................................................................................................... 18
3.4.1 Description ................................................................................................. 18
3.4.1.1 Operating Practice ................................................................................. 18
3.4.2 Shutdown Procedure ................................................................................... 19
3.4.3 DCC – Dynamic Contamination Control ......................................................... 20
3.4.4 MAXCOOL Function ..................................................................................... 20
3.4.5 Pressure Input ............................................................................................ 21
3.4.6 Data Logging .............................................................................................. 21
3.4.7 Frost Assurance Technology (FAST) .............................................................. 21
3.4.8 STANDBY Mode........................................................................................... 21
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

S8000 -100 User Manual
Michell Instruments v
3.5 User Interface .................................................................................................. 22
3.5.1 Main Screen ................................................................................................ 22
3.5.2 Customizable Readouts................................................................................ 23
3.5.2.1 Full-Screen Mode .................................................................................. 23
3.5.3 Operational Status Display ........................................................................... 24
3.5.4 Cooler Setup ............................................................................................... 25
3.5.5 Setup Menu Screen ..................................................................................... 26
3.5.5.1 Numeric Input ...................................................................................... 27
3.5.5.2 Leaving Menus ...................................................................................... 27
3.5.6 Menu Structure .......................................................................................... 28
3.5.7 DCC ........................................................................................................... 29
3.5.8 LOGGING ................................................................................................... 30
3.5.9 OUTPUTS ................................................................................................... 31
3.5.10 ALARM ....................................................................................................... 32
3.5.11 DISPLAY .................................................................................................... 33
3.5.12 CLOCK ....................................................................................................... 34
3.5.13 Inputs ........................................................................................................ 34
3.5.14 Comms....................................................................................................... 35
3.5.15 Network Settings ........................................................................................ 35
3.5.16 Extended Settings ....................................................................................... 36
4 WARNINGS AND FAULTS ..................................................................................37
4.1 Fault Codes ...................................................................................................... 38
4.2 Optics Warning ................................................................................................. 38
5 MAINTENANCE ................................................................................................39
5.1 Sensor Mirror Cleaning ...................................................................................... 39
5.2 Fuse Replacement ............................................................................................ 41
6 APPLICATION SOFTWARE ................................................................................42
Tables
Table 1 Front Panel Controls ....................................................................................6
Table 2 Rear Panel Connections ...............................................................................7
Table 3 Main Screen Description ............................................................................. 23
Table 4 Operational Status Display ........................................................................ 24
Table 5 Cooler Setup Parameters ............................................................................25
Table 6 Cooler Alarm Warnings ..............................................................................25
Table 7 DCC Parameters ........................................................................................29
Table 8 Logging Parameters ................................................................................... 30
Table 9 Outputs Parameters ................................................................................... 31
Table 10 Alarm Parameters ......................................................................................32
Table 11 Display Parameters ....................................................................................33
Table 12 Clock Parameters .......................................................................................34
Table 13 Inputs Parameters .....................................................................................34
Table 14 Comms Parameters....................................................................................35
Table 15 Network Parameters ..................................................................................35
Table 16 Extended Settings Parameters .................................................................... 36

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Figures
Figure 1 Operating Principle .....................................................................................2
Figure 2 Transit Bolt Locations ..................................................................................4
Figure 3 Front Panel ................................................................................................6
Figure 4 Rear Panel .................................................................................................7
Figure 5 Microscope Installation Procedure ................................................................9
Figure 6 Alarm and Analog Output Connection .........................................................10
Figure 7 USB Port Connection .................................................................................12
Figure 8 Ethernet Port ...........................................................................................13
Figure 9 RS232/485 Port (optional) .........................................................................13
Figure 10 Typical Operating Cycle .............................................................................15
Figure 11 Main Screen .............................................................................................22
Figure 12 Cooler Setup Screen .................................................................................25
Figure 13 Setup Menu Screen ..................................................................................26
Figure 14 Virtual Keyboard ......................................................................................27
Figure 15 Menu Structure ........................................................................................28
Figure 16 DCC Screen ..............................................................................................29
Figure 17 Logging Screen ........................................................................................30
Figure 18 Outputs Screen ........................................................................................31
Figure 19 Alarm Screen ...........................................................................................32
Figure 20 Display Screen .........................................................................................33
Figure 21 Clock Screen ............................................................................................34
Figure 22 Inputs Screen...........................................................................................34
Figure 23 Comms Screen .........................................................................................35
Figure 24 Network Settings Screen ...........................................................................35
Figure 25 Extended Settings Screen ..........................................................................36
Figure 26 System Alarm Screen ................................................................................37
Figure 27 Power Supply Fuse Replacement ...............................................................41
Appendices
Appendix A Technical Specications ..............................................................................43
A.1 Dimensions .................................................................................44
Appendix B Modbus Register Map ................................................................................46
Appendix C Quality, Recycling & Warranty Information ................................................... 55
Appendix D Return Document & Decontamination Declaration ........................................57

S8000 -100 User 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 is 0.06 MPa (0.6 barg / 8.7 psig). Refer to the Technical Specications
in Appendix A.
Toxic Materials
The use of hazardous materials in the construction of this instrument has been minimized. During
normal operation it is not possible for the user to come into contact with any hazardous substance
which might be employed in the construction of the instrument. Care should, however, be exercised
during maintenance and the disposal of certain parts.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. For
Michell Instruments’ contact information please go to www.michell.com.
Calibration
The recommended calibration interval for this instrument is 12 months. 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 standards
and directives. Further details of applied standards may be found in the Technical Specications in
Appendix A.

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Abbreviations
The following abbreviations are used in this manual:
barg bar gauge (100 kPa or 0.987 atm)
ºC degrees Celsius
ºF degrees Fahrenheit
DC direct current
g grams
in inch(es)
µm micrometer
m/sec meters per second
mA milliampere
mm millimetres
MPa megapascal
Nl/min normal liters per minute
Nm Newton meter
oz ounces
psig pounds per square inch
RH relative humidity
scfh standard cubic feet per hour
fps feet per second
T temperature
V Volts
Ω Ohms
ø diameter
Warnings
The 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.

S8000 -100 User Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The S8000 -100 is a high-precision laboratory reference instrument 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 0.06 MPa (0.6 barg /
8.7 psig).
The S8000 -100 is capable of measuring dew points as low as -100 °C (-148 °F), and
up to a maximum of +20 °C (+68 °F).
1.1 Operating Principle
The system operates on the chilled mirror principle, whereby a gas sample is passed
into the sensor housing and ows 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) 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), ooding 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 reected by the mirror. One of these
sensors (7) measures the light level due to the reected 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
reected light onto the sensor.
The output from each of these sensors is compared and then used to control the drive to
a Thermo-electric cooler (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 lm 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.

S8000 -100 User Manual
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INTRODUCTION
The ‘hot’ side of the Thermo-electric cooler 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 Thermo-electric cooler, by cooling it to an appropriate
temperature. This supplements the depression capabilities and enables measurement
of very low dew points.
6
5
1
94 7
8
2
3
11
10
12
13
Figure 1 Operating Principle

S8000 -100 User Manual
Michell Instruments 3
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
The S8000 -100 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 removing the instrument.
Carefully lift the unit out, holding the case and not the foam.
Ensure one person has a good grip of the unit whilst the other removes the foam
protectors.
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 bolts engaged, may result in warranty claims being denied.
The accessories crate should contain the following items:
• UKAS Accredited calibration certicate
• Pressure transmitter calibration certicate
• SD card
• USB or Ethernet communications cable
• IEC power cable
• Microscope + lens cover
• Remote Pt100 temperature probe (optional)
• Optics cleaning kit (optional)
If there are any shortages, please notify the supplier immediately.

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INSTALLATION
2.3 Transit Bolts
!
WARNING: The sensor assembly is equipped with transit
bolts to prevent vibration damage during shipping. These
must be released prior to operation.
To release:
1. Open enclosure door.
2. Insert 5mm Allen key through each access hole in the insulation in turn
(see Figure 2).
3. Rotate clockwise until lock bolts reach their end stops.
Figure 2 Transit Bolt Locations
If the instrument needs to be shipped, then the transit bolts should be engaged before
placing into the original packaging.
To engage:
1. Open the enclosure door.
2. Insert 5mm Allen key through each access hole in the insulation in turn
(see Figure 2).
3. Rotate anti-clockwise until lock bolts reach their end stops.

S8000 -100 User Manual
Michell Instruments 5
INSTALLATION
2.4 Operating Requirements
2.4.1 Environmental Requirements
It is important to operate the S8000 -100 within the following environmental conditions:
Minimum Operating Temperature 5°C
Maximum Operating Temperature 30°C
Maximum Relative Humidity 80%
2.4.2 Electrical Requirements
The S8000 -100 requires the following electrical supply:
• 85...264 V AC, 47/63 Hz, 185 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 30 V, 1A. NOTE: THIS RATING MUST NOT BE
EXCEEDED.

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INSTALLATION
2.4.2.1 Front Panel
1 2 3 4
Figure 3 Front Panel
No Name Description
1 SD Card Slot
Takes an SD card used to store logged data
See Section 3.5.8 for more details on how to use the logging
features
2Touch Screen
Display
Displays measured values and enables the user to control the
operation of the instrument
See Section 3.5 for information about the touch screen and
menu system
3Sensor Housing
Door covering the sensor chamber
See Section 5.1 for instructions on how to open the sensor and
clean the mirror
4Microscope port
cap
Cap covering the microscope port when not in use. Also used
as the key to open the sensor window. See Section 5.1 for
further details.
Table 1 Front Panel Controls

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Michell Instruments 7
INSTALLATION
2.4.2.2 Rear Panel Connections
1 2 3
5
4
6 7 8
9
Figure 4 Rear Panel
No. Name Description
1¼” Swagelok
Gas Outlet
Connection for venting sample gas to atmosphere or vent line
once it has passed through the instrument
2¼” VCR Gas
Inlet
Connection for supplying the instrument with sample gas, usually
at a pressure slightly higher than atmospheric to maintain ow
through the instrument
3External PRT
Connection
Banana sockets for external 4-wire measurement of the internal
PRT
See Section 2.4.8 for more information.
4Mains power
IEC Socket
Universal power input 85...264 V AC, 47/63 Hz
Fuse - 3.15 A, Anti-Surge, Glass, 20mm x 5mm
Features integrated power ON/OFF switch
5USB Type B
socket
Used for communication with the instrument via the application
software
66-Way Alarm
Relay Connector
Process and Fault alarm outputs
See Section 2.4.6 for general information on the alarm relays
See Section 3.5.10 for instructions on how to congure the process
alarm
7
Remote
Temperature
Probe Connector
6-Pin Lemo socket for connection of remote Pt100 temperature
probe
8
4-Way Analog
Output
Connector
Two congurable 2-wire channels providing 0...20 mA or 4...20 mA
output. The outputs are active (sourcing) and must be connected
to a passive (sinking) input on the receiving equipment.
See Section 3.5.9 for instructions on how to congure the analog
outputs
9
Additional
Comms Socket
(Optional)
Either a DB9 socket (RS232 or RS485 comms option), or RJ45
(ethernet comms option). Used for digital communication.
See Section 2.4.10 for details on how to congure the network
settings
Table 2 Rear Panel Connections

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INSTALLATION
!
These tasks should only be undertaken 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.
2.4.3 Power Supply Input
The AC power supply is a push t into the IEC C13 power input socket.
!
Ensure the power switch is OFF before connecting the cable.
The voltage range is 85...264 V AC, 47/63 Hz.

S8000 -100 User Manual
Michell Instruments 9
INSTALLATION
2.4.4 Microscope installation
To prevent any disturbance to the frost formation on the mirror, when required the
microscope should be installed prior to starting a measurement. The microscope lens
cover should be placed over the eyepiece when the mirror is not being observed.
1. Remove the gas block key from the enclosure door by rotating it until the
retaining lugs align with the slots in the panel.
2. Open the enclosure door.
3. Remove the microscope blanking plug from the sensor cap and close the
enclosure door.
4. Install the microscope in the sensor cap by inserting through the opening
in the enclosure door.
5. Place the lens cover over the eyepiece.
Figure 5 Microscope Installation Procedure

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INSTALLATION
2.4.5 Analog Output Connections
The two analog outputs can be congured 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 provide a current loop signal (4...20 mA or 0...20 mA). The
0/4...20 mA outputs are active (sourcing) and must be connected to a passive (sinking)
input on the receiving equipment. The conguration 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 3.5.5).
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:
Channel 1: Dew point, -100...+20ºC
Channel 2: ppmV, 0...3000
NOTE: The analog outputs are only active during the MEASURE phase. They
will, therefore, be o after switch-on and remain o until the system enters
the MEASURE phase.
The two analog output port connections are made via a single 4-way push t connector
block. All outputs are 2-wire, positive-going signals referenced to a common 0 V line. To
dierentiate 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 6 Alarm and Analog Output Connection

S8000 -100 User Manual
Michell Instruments 11
INSTALLATION
2.4.6 Alarm Output Connections
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 FAULT alarm.
Under the Setup Menu Screen, (refer to Section 3.5.5), the PROCESS alarm c an be congure d
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 two alarm output ports are connected to the instrument via a single 6-way, push-t
connector block as shown in Figure 6. Each output comprises a 3-wire set of potential
free, change-over relay contacts.
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 dierentiate 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.
DANGER
Electric
Shock Risk
WARNING: Alarm leads MUST be potential free when wiring
to the connector block. Both sets of contacts are rated at
30 V, 1A. THIS RATING MUST NOT BE EXCEEDED.
2.4.7 Remote Temperature Probe
1. Align the red dot on the body of the temperature probe connector with the
red dot on the socket labelled REMOTE TEMPERATURE (see Figure 6).
2. Push the connector into the socket until it locks. NOTE: Do not
attempt to force it into the socket. If it does not t 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 released rst.

S8000 -100 User Manual
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INSTALLATION
2.4.8 Remote Pt100 connections
External connections are provided to allow direct impedance measurement of
the mirror Pt100 by an external device. The connections are as follows:
Sense
Supply
Note that during DCC cycles, the instrument electronics will temporarily switch back to
Internal monitoring. Once the measurement phase resumes, the connections will be
switched back to External.
The Pt100 can be toggled between Internal and External monitoring in the Extended
Settings screen (see Section 3.5.16).
2.4.9 USB Communications Port Connector
The instrument features a USB 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 6 and 7) .
2. To remove the connector, pull it out of the socket by holding the
connector body. Do not attempt to remove the connector
from the socket by pulling on the cable.
Figure 7 USB Port 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 B for the Modbus register map.