Summary of Contents for PST MICHELL Instruments S8000
Page 1
S8000 Chilled Mirror Hygrometer User Manual 99005 Issue 1 February 2024...
Page 2
Please fill out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Instrument Code Serial Number Invoice Date Location of Instrument Tag Number Instrument Code Serial Number Invoice Date Location of Instrument Tag Number Instrument...
S8000 User Manual Safety The manufacturer has designed this equipment to be safe when operated using the procedures detailed in this manual. The user must not use this equipment for any other purpose than that stated. Do not apply values greater than the maximum value stated. This manual contains operating and safety instructions, which must be followed to ensure the safe operation and to maintain the equipment in a safe condition.
S8000 User Manual Abbreviations The following abbreviations are used in this manual: Dynamic Contamination Correction FAST Frost Assurance System Technology MAXCOOL Maximum Sensor Cooling alternating current barg pressure unit (=100 kP or 0.987 atm) gauge bara pressure unit (absolute) °C degrees Celsius °F degrees Fahrenheit...
S8000 User Manual INTRODUCTION INTRODUCTION The S8000 is a high precision instrument used for the measurement of dew point in air and other gases. Relative humidity, moisture content, and other calculated parameters based on dew point, pressure and temperature of the sample gas can also be displayed. The S8000 is capable of measuring dew points as low as -60 °C (-76 °F);...
S8000 User Manual INTRODUCTION 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.
S8000 User Manual INSTALLATION INSTALLATION Safety It is essential that the installation of the electrical and gas supplies to this instrument is undertaken by competent personnel. Unpacking the Instrument S8000 Packing Figure 3 Open the box (5) and unpack carefully as follows (see Figure 3 ): Remove the accessories box (4).
Page 12
S8000 User Manual INSTALLATION The accessories box should contain the following items: Traceable calibration certificate IEC power cable SD memory storage card Optics cleaning kit Allen Key SMM USB communications cable Pt100 temperature probe (optional) CAT5 ethernet cable (optional) Microscope (optional) If there are any shortages, please notify Michell Instruments immediately (see www.ProcessSensing.com for contact information).
S8000 User Manual INSTALLATION Operating Requirements 2.3.1 Environmental Requirements The S8000 instrument should either be placed on a firm and level surface in a laboratory environment, or mounted into a standard 19" rack. 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 +40 °C (+104 °F), providing the cooling vents are kept clear and unrestricted.
S8000 User Manual INSTALLATION Front Panel Figure 4 Front Panel Item Name Description Microscope Used to cover the microscope port when not in use. Also to Blanking Plug be used as a key to remove optics window. Exterior housing of the sensor. Sensor Housing Please see Section 5.3 for information about mirror maintenance.
S8000 User Manual INSTALLATION Rear Panel 8 77 Rear Panel Figure 5 Item Name Description Usually slightly above atmospheric pressure in order to Gas Input Port maintain flow rate over the mirror, but can be up to a maximum of 20 barg depending upon application. Gas Output Port Usually vented to atmosphere.
S8000 User Manual INSTALLATION Used for communication with the instrument over a network connection. RJ45 Ethernet See Section 3.2.14 for details on how to configure the Socket network settings. See Section 4 for information on using and installing the application software. Flow Control Used to regulate flow through the sensor when pump is in Valve (Optional)
S8000 User Manual INSTALLATION 2.5.2 Analog Output Connections The two 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 provide a current loop signal (4...20 mA or 0...20 mA).
S8000 User Manual INSTALLATION 2.5.3 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 PROCESS FAULT designated as a alarm and a alarm.
S8000 User Manual INSTALLATION 2.5.5 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. Check the orientation of the connector and gently push it into the communications socket (see Figures 6 and 7) .
S8000 User Manual INSTALLATION 2.5.7 Connection of Gas Supplies POSSIBLE INJURY! The tubing, valves and other apparatus attached to this instrument must be adequate for the maximum pressure which will be applied, otherwise physical injury to the operator or bystander is possible. Before connection or disconnection of the instrument to and from the gas line it is essential to vent the system to atmospheric pressure, otherwise severe injury could result.
Page 21
S8000 User Manual INSTALLATION The sample inlet and outlet connections are 6mm Swagelok tube couplings. The ® gas input connection must be made with 6mm stainless-steel tubing. The gas output connection for most applications can just be exhausted to atmosphere via 300 mm (11.8") of PTFE tubing (1).
S8000 User Manual INSTALLATION Internal Sample Pump (optional, for 1 barg only) The internal sample pump can be used to allow measurement of static samples at atmospheric pressure. The pump can be routed in to the sample loop or bypassed, depending on whether it is connected via the external tube link.
S8000 User Manual INSTALLATION Conversion of S8000 to Rack Mount Figure 11 illustrates the method for fitting a rack mount instrument into a standard 19” rack. To fit the unit proceed as follows: Figure 11 Rack Fixing Method Turn the unit on its left end and remove the four screws and washers from the side panel.
S8000 User Manual OPERATION OPERATION As supplied, the S8000 is ready for operation and a set of default parameters has been installed. This section describes both the general operation of the instrument and the method of setting it up and changing the default parameters (see Appendix C) – should this become necessary.
S8000 User Manual OPERATION Instrument Display The S8000 features a 5.7” color touch screen display. Initialising When the instrument is switched on, an status bar will be shown while the menu system loads. After the menu system has loaded, the Main Screen will show. Figure 12 Main Screen Michell Instruments...
S8000 User Manual OPERATION 3.2.1 Main Screen READOUTS STABILITY GRAPH READOUTS READOUTS OPERATIONAL STATUS DISPLAY FLOW RATE MAXCOOL / STANDBY / SET UP DCC OFF / MEASURE OPERATE DCC ON Figure 13 Main Screen Layout Name Description Readouts These readouts display measured instrument parameters. (Customizable) See Section 3.2.2 for additional information.
S8000 User Manual OPERATION 3.2.2 Customizable Readouts The three readouts on the Main Screen can be configured by the user to show any of the following parameters: • Dew Point • Temperature • Pressure • % Relative Humidity • • g/kg •...
S8000 User Manual OPERATION 3.2.3 Operational Status Display The Operational Status display includes the following: Reports current operational mode. Mode This will either be Measure, Standby, DCC, Hold Maxcool Flood Shows the time (in Hours: Minutes: Seconds) remaining until the Next Mode transition to the next mode of operation.
S8000 User Manual OPERATION 3.2.4 Setup Menu Screen The Setup Menu is used to adjust the operational parameters of the instrument, change the display setup and start or stop the data-logging feature. Initially, when the Setup Menu Screen is opened, a set of labelled icons is displayed. Touching one of these icons will take you to the appropriate submenu.
S8000 User Manual OPERATION 3.2.4.1 Numeric Input When entering a numeric value, a virtual keypad will be displayed. Figure 15 Virtual Keyboard The allowable range will initially be shown at the top of the keypad, e.g. 0 50 Some parameters can be disabled by entering a value of 0; this will be indicated by 0[off] ...
S8000 User Manual OPERATION 3.2.5 Menu Structure LOGGING OUTPUTS ALARM DISPLAY CLOCK INPUTS COMMS EXTENDED SETTINGS Type Interval Output Type Resolution Date Temperature Modbus PRT Mode Select input source Setpoint Parameter Stability Time Address Flood Output Value Recovery Mode Setpoint Temp Unit IP Address Type...
S8000 User Manual OPERATION 3.2.6 DCC Screen Figure 17 Parameter Description DCC heating temperature can either be relative to last measured dew point or an absolute temperature. Actual temperature or Δ is defined Type by ‘Setpoint’. Available Input: Relative, Absolute Mirror heating temperature during DCC, either absolute or relative to Setpoint last measured dew point.
S8000 User Manual OPERATION 3.2.7 LOGGING Logging Screen Figure 18 Parameter Description Changes the interval at which data is recorded Input format: mm:ss – Interval Limits: 00:05...10:00 Indicates status of inserted SD card: No SD Card inserted Ready to log Initialising card SD status indicator...
S8000 User Manual OPERATION 3.2.8 OUTPUTS Figure 19 Outputs Screen Parameter Description Output Selector Selects the output to be adjusted Arrows Determines the mA output range Output Type Available Input: 4...20 mA/0...20 mA Assigns the chosen calculated or measured parameter to this output channel Available Input: Dew Point, Temperature, Pressure, % Relative Parameter...
S8000 User Manual OPERATION 3.2.9 ALARM Alarm Screen Figure 20 Parameter Description Sets the trip criteria for the process alarm. Type Available Input: Over, Under, In. Band, Out. Band, Off Sets the parameter associated with the process alarm. Available Input: Dew Point, Temperature, Pressure, % Relative Parameter Humidity, g/m , g/kg, ppm...
S8000 User Manual OPERATION 3.2.10 DISPLAY Figure 21 Display Screen Parameter Description Changes the number of decimal places for all displayed parameters. Resolution Available Input: 1 DP, 2 DP, 3 DP Measurement unit for temperature values Temperature Unit Available Input: ºC, ºF Measurement unit for pressure values Pressure Unit Available Input: kPa, psig, psia, barg, bara...
S8000 User Manual OPERATION 3.2.11 CLOCK Figure 22 Clock Screen Parameter Description Date Current date. Time Current time. Table 10 Clock Parameters 3.2.12 Inputs Figure 23 Inputs Screen Parameter Description Changes between temperature input from external Source (Temperature Input) Pt100 or a fixed value. Available Input: Fixed, External Value (If ‘Fixed’...
S8000 User Manual OPERATION 3.2.15 ABOUT (Network Settings) When using an S8000 that is fitted with an Ethernet module this page is accessible via the About Screen. Network Settings Screen Figure 26 Parameter Description IP Address The IP address of the instrument. Subnet Mask The subnet mask that determines what subnet the IP address is on.
S8000 User Manual OPERATION 3.2.16 Extended Settings Extended Settings Screen Figure 27 Parameter Description PRT Mode Option not available on this model Sets sensor temperature to +20 °C and initiates an extended DCC if mirror temperature exceeds sensor temperature. See Section 3.5.7 for further Flood Recovery information.
S8000 User Manual OPERATION Warnings and Faults The S8000 contains a comprehensive self-diagnosis system to alert the user whenever there is an issue which could affect the measurement. These alerts are divided into two categories: Warnings: A problem which is not currently affecting the measurement but requires attention.
S8000 User Manual OPERATION 3.3.1 Fault Codes Name Description Chilled Mirror sensor Pt100 resistance out of Mirror PRT Failure range Remote Temperature probe Pt100 Ambient PRT Failure resistance out of range Chiller PRT Failure Cold finger Pt100 resistance out of range RESERVED Mirror temperature too high Mirror temperature exceeded 130 °C...
S8000 User Manual OPERATION Operational Functions 3.4.1 Operating Cycle The default parameters set up for the instrument define an operating cycle (see Figure 29 ) . Figure 29 Typical Operating Cycle At initial switch-on, the instrument enters a DCC cycle for 2 minutes. This heats the mirror to a default temperature of +20 °C (+36 °F) above the previously measured value - at the time of switch on this will be ambient temperature.
S8000 User Manual OPERATION Operating Guide 3.5.1 DCC – Dynamic Contamination Control Dynamic Contamination Control ( ) is a system designed to compensate for the loss of measurement accuracy which results from mirror surface contamination. During the process the mirror is heated to a default temperature of 20 °C above the dew point to remove the condensation which has formed during measurement.
S8000 User Manual OPERATION 3.5.2 MAXCOOL Function MAXCOOL function over-rides the dew-point control loop and applies maximum cooling drive to the Peltier heat pump. It can be used to determine: • the lowest temperature the mirror can be driven down to with reference to the sensor body.
S8000 User Manual OPERATION 3.5.5 Frost Assurance System Technology (FAST) Theoretically, it is possible for water to exist as a super-cooled liquid at temperatures down to -40 °C (-40 °F). A gas in equilibrium with ice is capable of supporting a greater quantity of water vapor at a given temperature than a gas in equilibrium with liquid water.
S8000 User Manual APPLICATION SOFTWARE APPLICATION SOFTWARE Application software which can be used for remote monitoring and data logging is available on the Michell Instruments website. A help file is included within the software for guidance on operation. Michell Instruments...
S8000 User Manual MAINTENANCE MAINTENANCE There are no user-serviceable parts on the S8000, other than the removal and replacement of the AC power supply fuse and cleaning the mirror in the sensor. Safety This equipment operates from power supply voltages that can be lethal and at pressures (depending upon application) that could cause injury.
S8000 User Manual MAINTENANCE Fuse Replacement If the instrument fails to operate after it has been connected to an AC power supply (85... 264 V AC, 47/63 Hz) and switched on, proceed as follows: NOTE: Fuse replacement should be carried out by qualified personnel. If the power supply cable is fitted with a fused plug, switch off the power supply, remove the plug, check and, if necessary, replace the fuse.
S8000 User Manual MAINTENANCE Sensor Mirror Cleaning WARNING Before removing the safety strap or opening the sensor housing it is essential to vent the system to atmospheric pressure, otherwise severe injury or damage to the equipment could result. Throughout the life of the instrument, periodic cleaning of the mirror surface and optics window may be required.
S8000 User Manual MAINTENANCE Replace the items in the reverse order. Make sure when refitting the optics block to align the gold contacts on the block with the gold contacts on the instrument. Replace the large stainless steel cover, screwing it in firmly but taking care not to overtighten it.
S8000 User Manual MAINTENANCE 5.3.2 Fitting the Microscope (Optional) To observe the frost formation on the chilled mirror surface, an optional microscope (Part No. S8K-RS-MCI) can be provided. The microscope allows direct viewing of the mirror surface, providing assurance that ice crystals have formed and that supercooled water is not present at temperatures below 0 °C.
S8000 User Manual GOOD MEASUREMENT PRACTICE GOOD MEASUREMENT PRACTICE The S8000 is designed to operate in a flowing gas stream. The sampling chamber, which enables a small sample of gas to be passed over a Peltier chilled, plated copper mirror, is designed to operate at pressures up to 1 barg (14.5 psig) (low pressure version), and up to 20 barg (290 psig) max (high pressure version).
S8000 User Manual GOOD MEASUREMENT PRACTICE Sampling Hints Ensuring reliable and accurate moisture measurements requires the correct sampling techniques, and a basic understanding of how water vapor behaves. This section aims to explain the common mistakes and how to avoid them. Sampling Materials –...
Page 55
S8000 User Manual GOOD MEASUREMENT PRACTICE Temperature and Pressure effects As the temperature or pressure of the environment fluctuates, water molecules are adsorbed and desorbed from the internal surfaces of the sample tubing, causing small fluctuations in the measured dew point. Adsorption is the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to the surface of a material, creating a film.
Page 56
S8000 User Manual GOOD MEASUREMENT PRACTICE • Accentuate adsorption and desorption effects on the gas passing through the sampling system. • Allow pockets of wet gas to remain undisturbed in a complex sampling system, which will then gradually be released into the sample flow. •...
S8000 User Manual CALIBRATION CALIBRATION Traceability The calibration of this instrument is traceable to national standards. For this reason the instrument can only be calibrated in an accredited e.g. NIST or UKAS accredited, standards laboratory. If these facilities do not exist, the instrument must be returned to the manufacturer, Michell Instruments, or an approved agent (for contact information go to www.
S8000 User Manual PREPARATION FOR SHIPPING PREPARATION FOR SHIPPING For shipping purposes, the instrument should be packed into its original carton, the latter providing the recommended degree of protection during transit. To prepare the instrument for shipping, proceed as follows. Switch off the instrument and remove the power supply cable.
Page 59
S8000 User Manual APPENDIX A Appendix A Technical Specifications Michell Instruments...
S8000 User Manual APPENDIX A Dimensions 178.5 mm 46.0 mm 7.028 ins 1.811 ins 440.0 mm 17.323 ins 338.9 mm 13.343 ins 29.2 mm 1.150 ins Michell Instruments...
Page 62
S8000 User Manual APPENDIX B Appendix B Modbus Register Map 99005 Issue 1, February 2024...
S8000 User Manual APPENDIX B Appendix B Modbus Register Map Register Types Type Description uint16 unsigned 16 bit value uint32 unsigned 32 bit value over two registers Register names ending with _MS contain the upper 16 bits Register names ending with _LS contain the lower 16 bits flags unsigned 16 bit value where each bit represents a flag, value can be a combination of flags float...
Page 64
S8000 User Manual APPENDIX B Address Access Data Type Register Map Definition Max. Min. Default uint16 PRESSURE_UNIT 0 = PSIG 1 = PSIA 2 = BARG 3 = BARA 4 = KPA uint16 DECIMAL_PLACES Instrument Status uint16 OPERATING_MODE 0 = NO_CHANGE 1 = SYSTEM_FAILURE 2 = STANDBY 3 = MEASURE...
Page 65
S8000 User Manual APPENDIX B Address Access Data Type Register Map Definition Max. Min. Default 0 = Not Fitted 1 = No Card 2 = Ready 3 = Logging 4 = Writing 5 = Mount Error 6 = Write Error 7 = Mounting 8 = Write Protected 9 = Unknown...
Page 66
S8000 User Manual APPENDIX B Address Access Data Type Register Map Definition Max. Min. Default 0 = off (dry) 1 = on (wet) R|W|F float MOL_WEIGHT_MS 999999.9 28.9645 R|W|F MOL_WEIGHT_LS User configuration – DCC/FAST R|W|F boolean DCC_SETPOINT_MODE 0 = absolute 1 = relative R|W|F int16...
Page 67
S8000 User Manual APPENDIX B Address Access Data Type Register Map Definition Max. Min. Default 0 = Dewpoint 1 = Temperature 2 = Pressure 3 = %rh 4 = Water content: ppm 5 = Water content: ppm 6 = Mixing ratio 7 = Absolute humidity 8 = Wetbulb 9 = Water vapour pressure...
Page 68
S8000 User Manual APPENDIX B Address Access Data Type Register Map Definition Max. Min. Default R|W|F uint16 PROCESS_ALARM_TYPE 0 = Off 1 = Over setpoint 2 = Under setpoint 3 = Inside band 4 = Outside band R|W|F float PROCESS_ALARM_HYSTER_MS R|W|F PROCESS_ALARM_HYSTER_LS R|W|F...
Page 69
S8000 User Manual APPENDIX B Address Access Data Type Register Map Definition Max. Min. Default 0 = English 1 = German 2 = Spanish 3 = French 4 = Italian 5 = Portuguese 6 = USA 7 = Russian 8 = Japanese 9 = Chinese R|W|F uint16...
Page 70
S8000 User Manual APPENDIX B Address Access Data Type Register Map Definition Max. Min. Default User configuration – Feature Unlock uint32 SECURITY_CODE_MS 4294967295 SECURITY_CODE_LS uint32 FEATURE_CODE_MS 4294967295 FEATURE_CODE_LS uint16 FEATURE_FEEDBACK / RESERVED 65535 Instrument Control 1000 uint16 SET_MODE 1 = Standby 2 = DCC 4 = Maxcool 8 = Cancel maxcool...
Page 71
S8000 User Manual APPENDIX C Appendix C Default Values Michell Instruments...
S8000 User Manual APPENDIX C Appendix C Default Values The default values for the HMI Settings are as follows: Main Page Dew point Middle Temperature Bottom Pressure Flow Fixed Outputs 4...20 mA, dew point, -60...+20 °C 4...20 mA, ppm , 0...3000 4...20 mA, flow, 0...1000 ml Alarm 0 °Cdp...
Page 73
S8000 User Manual APPENDIX D Appendix D Quality, Recycling & Warranty Information Michell Instruments...
S8000 User Manual APPENDIX D Appendix D Quality, Recycling & Warranty Information Michell Instruments is dedicated to complying to all relevant legislation and directives. Full information can be found on our website at: www.ProcessSensing.com/en-us/compliance This page contains information on the following directives: •...
Page 75
APPENDIX E S8000 User Manual Appendix E Return Document & Decontamination Declaration Michell Instruments...
S8000 User Manual APPENDIX E Appendix E Return Document & Decontamination Declaration Decontamination Certificate IMPORTANT NOTE: Please complete this form prior to this instrument, or any components, leaving your site and being returned to us, or, where applicable, prior to any work being carried out by a Michell engineer at your site.
Page 77
S8000 User Manual NOTES Michell Instruments...
Need help?
Do you have a question about the MICHELL Instruments S8000 and is the answer not in the manual?
Questions and answers