Michell Instruments S8000-RS Operating Manual

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S8000 RS

Chilled Mirror Hygrometer

User’s Manual

97315 Issue 9

April 2019

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S8000 RS

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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.

S8000 RS User’s Manual S8000 RS User’s Manual

94 7

Figure 1

Operating Principle

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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

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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

Figure 4

No Name Description

Takes an SD card used to store logged data

1 SD Card Slot

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

Front Panel

Table 1

Front Panel Controls

6 97315 Issue 9, April 2019

Rear Panel

INSTALLATION

Figure 5

No. Name Description

¼” Swagelok Gas Outlet

¼” VCR Gas Inlet

External PRT Connection

Mains power IEC Socket

6-Way

Analog Output Connector

Remote

Temperature Probe Connector

6-Way

Alarm Relay Connector

RJ45

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

Rear Panel

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

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

OFF

N/O

COM

REMOTE TEMPERATURE

INSTALLATION

Figure 9

ALARMS

FAULT PROCESS

USB

N/C

N/O

Figure 10

COM

USB Port Connection

LAN

REMOTE TEMPERATURE

OFF

COM

Ethernet Port

ANALOGUE OUTPUTS

CH1

CH2

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

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

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

3 OPERATION

As supplied, the S8000 RS 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 Section 3.2.5) should this become necessary.

3.1 General Operational Information

While the instrument can physically operate in a flowing gas stream of between 500 and 1000 ml/min (1 and 2.1 scfh), Michell Instruments recommends operating at 750 ml/min (1.6 scfh), which is the flow-rate used during calibration. Operating at an alternative rate could impact the instrument’s response time.

The sample inside the sensor is passed over a Peltier chilled, gold-plated mirror. The instrument controls the mirror temperature to a point where a level of condensate is maintained on the mirror surface. The temperature of the mirror is then measured as the dew point.

OPERATION

The S8000 RS is suitable for the measurement of moisture content in a wide variety of clean, non-corrosive gases. It will not contaminate high purity gases and is safe for use in critical semi-conductor and fiber optic manufacturing applications.

3.1.1 Sample Flow Adjustment

• The sample flow is measured by the internal flow meter installed into the sample line - preferably after the dew-point sensor.

• The recommended flow setting is 750 ml/min (1.6 scfh).

• The sample flow can be adjusted by the installation of a needle

valve in the sample line. If a pressurized sample is to be measured at atmospheric pressure, the needle valve needs to be installed and adjusted upstream of the sensor. For measurements at sample pressure, the flow adjustment should be made downstream of the sensor.

Michell Instruments 17

OPERATION

S8000 RS User’s Manual S8000 RS User’s Manual

3.2 Start-up procedure when measuring in flammable gases

The S8000RS has a migration path to prevent condensation occurring in the area immediately surrounding the thermo-electric cooler. In order to prevent a potentially explosive mixture forming in this area as the flammable sample gas combines with the residual air, the instrument should be purged prior to operation.

This can be achieved in one of two ways:

1. With inert gas for a minimum of 8 hours at the normal sample flow rate of 750ml/min. The instrument does not need to be powered on while this purge is in progress.

2. With the flammable sample gas for a minimum of 8 hours at the normal sample flow rate of 750ml/min. The instrument MUST BE

POWERED OFF while this purge is in progress.

3.3 Instrument Display

The S8000 RS features a 5.7” color touch screen display.

When the instrument is switched on an Initialising overlay will be shown while the menu system loads.

Figure 13

Initialising Overlay Screen

After the menu system has loaded, the Main Screen will show.

18 97315 Issue 9, April 2019

OPERATION

748

25.01

-79.92

-79.5

-80.5

-60.0

3.3.1 Main Screen

Figure 14

5 6 7 8

DCC OFF /

DCC ON

READOUTS

SENSOR TEMP

READOUT

MAXCOOL /

MEASURE

Figure 15

Main Screen

OPERATIONAL

STATUS DISPLAY

STANDBY /

OPERATE

Main Screen Layout

STABILITY

GRAPH

SET UP

Michell Instruments 19

OPERATION

No Name Description

S8000 RS User’s Manual S8000 RS User’s Manual

1 Readouts

(Customizable)

2 Sensor Temperature

Readout

These readouts display measured instrument parameters

See Section 3.3.2 for additional information

This readout primarily shows the measured sensor body temperature The sensor body temperature set-point is displayed in yellow in the top right of the readout The cooler mode of operation - automatic or manual - is indicated by a small A or M See Section 3.3.4 for cooler setup parameters Touch the readout once to display the cooler setup menu The instrument will indicate when flood recovery is active by means of a yellow FR (Flood recovery) warning icon displayed in the sensor temperature window. The sensor

status indicator will also show FR in red text. See section

3.5.1.3 for further information.

3 Stability Graph Displays a plot of the dew point over time

Touch the readout once to enter full screen mode

4 Operational Status

Display

5 DCC Button Initiate a DCC cycle. See Section 3.4 for a detailed

6 MAXCOOL Button Toggle MAXCOOL mode. See Section 3.6.2 for a detailed

7 STANDBY Button Switch between Measure and Standby mode

8 SETUP Button Access to the Setup Menu

A detailed description of each item displayed in this area is in Section 3.3.3

explanation of the DCC function See Section 3.3.7 for DCC setup parameters

explanation of the MAXCOOL function

When switching to Measure mode a DCC cycle will be initiated See Section 3.6.6 for a detailed explanation of standby mode

See Section 3.3.5 for more information about the setup menu system

Table 3

3.3.2 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

• Temperature – Dew point

• Relative Humidity, %RH

• Water Content (ppmV; ppmW; g/kg; g/m3)

• Pressure *

• Flow

* Pressure is only available as an option if a pressure transducer is installed in the instrument

The parameters displayed by default are Dew point, Water Content (ppmV) and Flow.

Main Screen Description

20 97315 Issue 9, April 2019

Follow these instructions to change the parameter:

1. Touch the readout once to enable parameter selection

2. Touch the left or right arrows to select the parameter to be displayed

3. Touch the center of the readout to confirm selection

Full Screen Mode

Any of the readouts can be shown in full screen mode by touching and holding the readout.

3.3.3 Operational Status Display

The Operational Status display includes the following:

Indicates data logging is enabled. Refer to Sections 3.2.8 and 3.4.6

OPERATION

∆DP Represents the change in dew point over the stability time of the graph

Mode Reports current operational mode

This will either be Measure, Standby, DCC, Hold or Maxcool

Next Mode Shows the time (in Hours: Minutes: Seconds) remaining until the transition

to the next mode of operation

Process

Fault Used to monitor the optical system and the degree of mirror contamination

Sensor Indicates the operational mode of the sensor

This two-state, ON/OFF notification indicates whether a parameter process alarm is either ON or OFF

The process alarm can be set on any parameter (refer to Section 3.2.10)

During normal operation, with no fault conditions, this will read OFF. It will be set to ON if there is either a fault with the optics or dp temperature

measurement or if the mirror contamination exceeds 100% of the film thickness

This can be either CONTROL, HEATING or COOLING

Table 4

Operational Status Display

Michell Instruments 21

OPERATION

3.3.4 Cooler Set up

The Cooler Setup screen is accessed by touching Sensor Temp readout on the Main Screen. Refer to Section 3.4.2 for detailed information on the operation of the sensor cooling system.

S8000 RS User’s Manual S8000 RS User’s Manual

System Temperature: OFF

Input out of range: OFF

System Shutdown: OFF

Figure 16

Parameter Description

Set-point Controls the sensor temperature Mode Changes between Automatic and Manual cooler control

Table 5

In manual mode the cooler set-point must be maintained higher than the dew-point of the applied gas. A margin of at least 10°C is recommended.

Cooler Alarm Warnings

System Temperature

Input out of range

System Shutdown

Description

Cooler heat-sink close to maximum safe temperature The environmental temperature may be too hot, or the fan may have stopped operating Continuing to operate the S8000 RS without addressing this problem may cause the cooler to overheat

Hardware fault Contact Michell Instruments' service department

Cooler has been automatically disabled to prevent damage May be caused by overheating, power supply problem or other safety issue

Cooler Setup Screen

Cooler Setup Parameters

Table 6

Cooler Alarm Warnings

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3.3.5 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.

OPERATION

Figure 17

Once a submenu has been entered, parameters can be changed by touching the outlined values. There are three types of input for editable values:

• Toggle Button – Touching the outlined value will switch between predefined states, i.e. On/Off or Auto/manual

• List Selection – A list of options will be displayed for the user to select

• Numeric Input – Touching the outlined value will bring up the numeric

keypad (see following page)

Setup Menu Screen

Michell Instruments 23

OPERATION

Numeric Input

When entering a numeric value a virtual keypad will be displayed.

S8000 RS User’s Manual S8000 RS User’s Manual

7 8 9

5 6

2 3

Figure 18

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]  50

•

• Backspace

• Cancel input

•

Leaving Menus

To return from a menu or to cancel a numeric input, touch the exit icon.

24 97315 Issue 9, April 2019

Clear Input

Save input

3.3.6 Menu Structure

OPERATION

READOUTS

STABILITY

GRAPH

READOUTS

OPERATIONAL

STATUS DISPLAY

SENSOR TEMP

READOUT

DCC

Display Hold

Period

Reset Optics

Setpoint

Interval

Output Hold

LOGGING

Status

Filename

Interval

DCC OFF /

DCC ON

Output Select

Output Type

Parameter

Minimum

Maximum

OUTPUT

MAXCOOL /

MEASURE

ALARM

Parameter

Setpoint

STANDBY /

OPERATE

DISPLAY

Resolution

Primary Unit

Pressure Unit

Stability

FAST

PRT Mode

Language

Backlight

SET UP

CLOCK ABOUT HELP

Date

Time

Network Settings

IP Address

Subnet Mask

Default Gateway

Press to return to

Press for more

Main Page

information

Figure 19

Menu Structure

Michell Instruments 25

OPERATION

3.3.7 DCC

S8000 RS User’s Manual S8000 RS User’s Manual

Figure 20

Parameter Description

Display Hold

Period

Reset Optics Triggers a reset of the optical signal level on the next DCC cycle

Setpoint

Interval

Output Hold

Holds the values on the display while the instrument is in HOLD mode Available Input: On/Off

Duration of the DCC cycle Available Input: 1 to 59 minutes

Mirror heating temperature above measured dew point during DCC cycle Available Input: 10 to 40°C (50 to 104°F)

Time between automatic DCC cycles Available Input: 1-99 hours. Set to 0 to disable automatic DCCs

Time to hold the output at the last measured value after finishing a DCC cycle

Available Input: 1 to 59 minutes

Table 7

DCC Screen

DCC Parameters

26 97315 Issue 9, April 2019

3.3.8 LOGGING

OPERATION

Figure 21

Parameter Description

Status Displays the status of the current logging operation Filename Displays the filename of the current log file

Interval

SD Card Icon Shows the SD card status - refer to Table 9 START/STOP

Button

Time in seconds between recording readings in the log file Available Input: 5 to 600 seconds

Automatically generates a new file name based on current time and date - Starts logging at specified interval

Table 8

Logging Screen

Logging Parameters

Michell Instruments 27

OPERATION

The table below explains the status of the SD card. The icon is shown in the bottom left hand corner of the Logging screen.

S8000 RS User’s Manual S8000 RS User’s Manual

Icon Description

SD Card not fitted

Insert SD Card

Initializing SD Card

Wait before attempting to start logging



110001 010001 001011

SD Card ready to start logging

SD Card locked/write protected

Remove the SD Card and set the write-protect switch on the top left side of the card to the UP position

Information being transferred to the SD Card

Do not remove the SD Card or power off the instrument

Logging in progress

Do not remove the SD Card or power off the instrument

SD Card error

Check the card is formatted correctly (FAT-32)

Hardware error

Contact Michell Instruments' service department

Table 9

SD Card Status Indicators

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3.3.9 OUTPUTS

OPERATION

Parameter Description

Output Select

Output Type

Selects the output to be adjusted Available Input: Output 1, 2 or 3

Selects the type of analog output signal to use Available Input: 4-20 mA/0-20 mA/0-1 V

The parameter used to control the selected output

Parameter

Available Input: g/m3, g/kg, T-DP, DP, %RH, ppmV, ppmW, T, psig, barg, kPa, MPa, ml/min

Minimum

Maximum

The minimum output range for the selected parameter Available Input: Dependent on parameter

The maximum output range for the selected parameter

Available Input: Dependent on parameter

Table 10

% RH

Figure 22

100

Outputs Screen

Outputs Parameters

3.3.10 ALARM

Parameter Description

Parameter

Setpoint

Figure 23

Alarm Screen

The parameter used to control the alarm Available Input: g/m3, g/kg, T-DP, DP, %RH, ppmV, ppmW, T, psig, barg, kPa, MPa, ml/min

Set point that triggers the alarm relay to activate. The alarm is a HIGH alarm that triggers when the selected parameter exceeds the setpoint.

Available Input: Dependent on parameter

Table 11

Alarm Parameters

Michell Instruments 29

OPERATION

3.3.11 DISPLAY

S8000 RS User’s Manual S8000 RS User’s Manual

Parameter Description

Number of decimal places used when displaying parameters on the

Resolution

Primary Unit

Pressure Unit

Stability

FAST

PRT Mode

Language

Backlight

Main Screen Available Input: 1, 2, 3

Temperature unit to be used on the display and menus Available Input: ºC / ºF

Pressure unit to be used on the display and menus Available Input: psig, barg, kPa, MPa

Time scale in minutes for the Stability Graph on the Main Screen Available Input: 1 to 600 minutes

Enables or disables the Frost Assurance System Technology. See Section 3.4.7 Available Input: OFF / ON

If required for the calibration process or for external monitoring, the internal PRT can be made available for external connection via the 4 banana sockets on the back of the instrument Please note that this will disable the internal PRT measurement circuit of the instrument Available Input: INTERNAL / EXTERNAL

Selects the language used for the menu screens Available Input: English / Deutsch / Español / Francais / Italiano / Português / USA / Russian / Chinese

The brightness of the backlight

Available Input: 5 to 100%

Figure 24

Display Screen

Table 12

Display Parameters

30 97315 Issue 9, April 2019

3.3.12 CLOCK

192

255

168

255

1 1

255

168192

OPERATION

Parameter Description

Date Current date Time Current time

3.3.13 ABOUT (Network Settings)

When using an S8000 RS that is fitted with an Ethernet module this page is accessible via the About Screen.

Figure 25

Table 13

Clock Screen

Clock Parameters

Figure 26

Network Settings Screen

Parameter Description

IP Address The IP address of the instrument Subnet Mask The subnet mask that determines what subnet the IP address is on Default

Gateway

The default gateway for network communication

Table 14

Network Parameters

Michell Instruments 31

OPERATION

3.4 Operational Functions

3.4.1 Operating Cycle

S8000 RS User’s Manual S8000 RS User’s Manual

The default parameters set up for the instrument define an operating cycle, see

Figure

28.

Figure 27

At initial switch-on, the instrument enters a DCC cycle for 2 minutes. This heats the mirror 20°C (36°F) above the previously measured value - at the time of switch on this will be ambient temperature. This ensures that all moisture is driven off the surface of the mirror.

Typical Operating Cycle

The mirror is maintained at this temperature for the DCC duration (default 4 minutes) or 2 minutes on switch-on. During the DCC process, Data Hold fixes the analog outputs at the value(s) read before DCC commenced. Data Hold typically lasts 4 minutes from the end of a DCC cycle, or until the instrument has reached the dew point. This procedure is in place to prevent any system which is connected to the outputs from receiving a 'false' reading.

After the DCC period has finished, the measurement (MEASURE) period commences, during which the control system decreases the mirror temperature until it reaches the dew point. The sensor will take a short amount of time to settle on the dew point. The length of this stabilization time depends upon the temperature of the dew point. When

the measurement is stable the Sensor area of the display will indicate CONTROL.

The end of a DCC cycle re-sets the interval counter, meaning that another DCC will start (by default) in 4 hours time. Once the measurement is stable, HOLD will release, and the analog outputs will resume their normal operation. At this point, the STATUS area of the display will change to MEASURE.

32 97315 Issue 9, April 2019

3.5 Operating Guide

3.5.1 Automatic Mode

3.5.1.1 Description

When the instrument is switched on the cooler set-point will initially be +20°C (+68°F). The instrument will initialize by running a DCC cycle. After the DCC cycle is complete, the system will cool the mirror. As soon as moisture is detected on the mirror, the instrument will calculate the required sensor temperature set-point, which will be displayed in yellow in the top right of the sensor temperature readout on the Main Screen.

If the dew point is -40°C (-40°F) or higher, the sensor temperature set-point will be set to +20°C (+68°F), otherwise the sensor temperature set-point will be set to at least 30°C (54°F) above the dew point. For example, if the dew point is between -60 and

-69°C (-76 and -92°F), the sensor temperature will be set to -30°C (-22°F).

If the system does not detect moisture on the mirror on the first attempt, it will change the sensor temperature to -50°C (-58°F), run another DCC cycle and repeat the process of cooling the mirror, until condensation is detected.

OPERATION

The instrument will monitor the dew point and sensor temperature values and, if the dew point rises to within 10°C (18°F) of the sensor temperature, the sensor temperature set point will be increased by 10°C (18°F). However, if the dew point decreases to 30°C (54°F) below the sensor temperature, then the sensor temperature set-point will decrease by 10°C (18°F). This means that the instrument will track the dew point and increase, or decrease, the sensor temperature accordingly in order to maintain this differential.

If there is a sudden large increase in dew point and the dew point rises rapidly by more than 20°C (36°F), the instrument will wait for the dew point reading to stabilize before changing the sensor temperature. This will ensure that short dew-point disturbances do not cause the sensor temperature to change unnecessarily.

Sensor temperature will only change during measurement mode, never during DCC.

3.5.1.2 Operating Practice

Avoid situations in your operating cycle where a dew point is introduced to the instrument which is greater than the current sensor temperature. Precautions should be taken to either gradually increase the sample humidity, or manually change the cooler temperature in advance. If precautions are not taken, condensation may form in the inlet tubing – see Section 3.4.1.3, Flood Recovery, for more detail.

During transitions from a wet to a dry dew point, condensate formed during the wet measurement may not always clear from the mirror before it cools to the new dew point. Poor frost formation will result, leading to a interruption of the measurement. To prevent this; when the sensor temperature target changes to at least 30°C (54°F) below its present value, a DCC will be triggered automatically to clear any remaining condensate from the mirror.

Michell Instruments 33

OPERATION

3.5.1.3 Flood Recovery

If the sensor has detected that a flooding event has occurred, the following steps will be taken to recover the measurement:

1. The sensor cooler will be switched off, and the sensor temperature will rise to +20°C (+68°F).

2. The mirror temperature will be increased.

3. Once the sensor temperature has reached +20°C (+68°F), a DCC will be initiated.

4. Once a DCC cycle has been completed, normal measurement will resume.

The instrument will indicate when flood recovery is active by means of a yellow FR (Flood recovery) warning icon displayed in the sensor temperature window. The sensor

status indicator will also show FR in red text.

3.6 Manual Mode

3.6.1 Description

S8000 RS User’s Manual S8000 RS User’s Manual

When the instrument is switched on, the cooler set-point will initially be +20°C (+68°F). The user is responsible for selecting the appropriate sensor temperature set-point via the Cooler Setup Page.

3.6.1.1 Operating Practice

The S8000 RS will only be capable of measuring dew points down to -50°C (-58°F) with the cooler temperature set to +20°C (+68°F). When measuring dew points below -50°C (-58°F), it is necessary to set the sensor temperature to approximately 30°C (54°F) above the dew point to be measured in order to maintain a fast speed of response.

If the dew point is not known, then it is advisable to operate in automatic mode to allow the instrument to find the correct temperature autonomously. If manual cooler operation is essential, then following steps should be taken to determine the dew point, before setting the cooler temperature:

1. Ensure that the mirror is clean, and the sample flow rate is correctly set to 750ml/ min (1.6 scfh).

2. Switch the instrument on.

3. Ensure the sensor temperature is set to +20°C (+68°F).

4. After the DCC is complete, the S8000 RS will cool the mirror down:

a. If the dew point is wetter than -55°C (-67°F):

i. The instrument will cool the mirror below -55°C (-67°F).

Frost will then begin to form on the mirror, after which the mirror temperature will start to increase, and settle on that of the dew point.

ii. The S8000 RS will only measure this dew point for

approximately 40 minutes with the cooler temperature set to +20°C (+68°F). Once the dew point has been found, set the cooler temperature to approximately 30°C (54°F) above the dew point.

34 97315 Issue 9, April 2019

b. If the dew point is dryer than -55°C (-67°F):

i. The instrument will cool the mirror down to approximately

-55 to -65°C (-67 to -85°F) (depending on the actual sensor temperature). When the mirror has been cooled to the minimum temperature possible, it will remain at that value. However, due to heat generated by the Thermoelectric cooler cooling at the limit of its capacity, the mirror temperature will gradually increase.

ii. Observing the mirror through the microscope will confirm

that there is no frost on the mirror, and therefore the dew point is lower than the displayed mirror temperature.

iii. Switch the instrument to Standby.

iv. Set the sensor temperature to -50°C (-58°F), and wait for it

to stabilize.

v. Switch the instrument to Operate.

OPERATION

vi. The instrument will cool the mirror below the dew point.

Frost will then begin to form on the mirror, after which the mirror temperature will increase to that of the dew point.

3.6.2 DCC - Dynamic Contamination Control

Dynamic Contamination Control (DCC) is a system designed to compensate for the loss of measurement accuracy which results from mirror surface contamination.

During the DCC process the mirror is heated to a default temperature of 20°C above the dew point to remove the contamination that has formed during measurement. The surface finish of this mirror, with the contamination which remains, is used by the optics as a reference point for further measurements. This removes the effect of contamination on accuracy.

After switch-on, the mirror is assumed to be clean, therefore the instrument will only run a DCC for 2 minutes to quickly establish a clean mirror reference point. By default, every subsequent DCC is 4 minutes in duration and will automatically occur every 4

hours.

At certain times, it may be desirable to disable the DCC function in order to prevent it from interrupting a measurement cycle, e.g. during a calibration run.

A manual DCC can be initiated or cancelled by touching the DCC button on the Main Screen. The DCC button is context sensitive, i.e. if DCC is on, the Main Screen shows

DCC OFF as being selectable. Similarly if DCC is off, DCC ON is shown.

It is possible to change the parameters relating to the DCC cycle on the DCC Setup Screen, refer to Section 3.2.7.

Michell Instruments 35

OPERATION

3.6.3 MAXCOOL Function

The 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 what temperature the mirror can be driven down to with reference to the sensor body. This temperature is indicated on the display.

• to determine whether or not the instrument is controlling at the dew point and whether it is able to reach it. This situation could, for instance, arise when attempting to measure very low dew points where, possibly due to a high ambient temperature, the Peltier heat pump is unable to depress the temperature far enough to reach the dew point.

• to determine whether the instrument is controlling by switching

MAXCOOL on for a short period and then switching back to MEASURE.

This will depress the mirror temperature briefly and when it is switched back to MEASURE the control loop should be able to stabilize the mirror

temperature at the dew point again.

S8000 RS User’s Manual S8000 RS User’s Manual

The MAXCOOL function can be turned on by touching the MAXCOOL button on the Main Screen.

3.6.4 Pressure Input

As an option, the S8000 instrument can be fitted with an internal pressure sensor that measures the sample gas pressure. The pressure measured by this sensor is then used internally as the basis for calculation of all of the pressure related parameters, ppmV, ppmW, g/m3 and g/kg. If a pressure transducer is not fitted 101.3 kPa is used as the basis of all these calculations. The internal pressure transducer is ranged 0 to 16 bara (0 to 232 psia).

3.6.5 Data Logging

The data logging function allows all of the measured parameters to be logged at a user specified interval on the supplied SD card via the SD card slot on the front of the instrument. The filename for each log file is generated automatically from the instrument date and time.

Log files are saved in CSV (comma separated value) format. This allows them to be imported easily into Excel or other programs for charting and trend analysis. To set-up data logging refer to Section 3.2.8.

36 97315 Issue 9, April 2019

3.6.6 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. This means that a measurement below 0°C taken over water will read approximately 10% lower than the same measurement taken over ice.

When turned on and FAST is enabled, the S8000 RS makes an initial dew point measurement. If the initial measurement is between 0°C and -40°C then the mirror is driven down to below -40°C to ensure the formation of ice on the mirror surface. The instrument then continues operation as normal – once ice has formed it will remain as ice until the temperature is raised above 0°C (+32°F).

If required, the instrument’s FAST function can be switched on and off. To enable or disable the FAST function, refer to Section 3.2.11.

OPERATION

3.6.7 STANDBY Mode

This function is used for applications where the dew point of the sample gas changes very quickly from dry to wet, creating conditions which may cause the sensor to saturate. Alternatively, it may be used in applications requiring infrequent manual measurements to be taken, where it is preferable to have the sensor disabled between measurements.

In STANDBY mode, drive to the Peltier heat pump is removed. While STANDBY mode is enabled the sensor temperature will remain constant.

The main use for this feature is during set up (when measurements are not required), i.e. when flow rates are being adjusted and the analog outputs are being configured.

Michell Instruments 37

APPLICATION SOFTWARE

4 APPLICATION SOFTWARE

The S8000 RS features either USB or Ethernet communications depending on the model.

The application software is also available from the support section of the Michell Instruments' website at: http://www.michell.com/uk/support/sware-downloads.htm

4.1 Installation

1. Extract the contents of the supplied zip file to a suitable location.

2. Close all currently running Windows programs.

3. Launch the installer and follow the on-screen instructions.

4. The installer will ask for an authorization code, enter 7316-MIL1-

8000.

5. Restart the PC to complete the installation.

S8000 RS User’s Manual S8000 RS User’s Manual

4.2 Establishing Communications

When launching the application software, the Communications Setup screen will be displayed. The following sections explain how to establish communication with the S8000 RS, depending on whether it is fitted with a USB or Ethernet module.

Figure 28

Communications Setup Screen

38 97315 Issue 9, April 2019

4.2.1 USB Communication

1. Connect the S8000 RS to the PC using the supplied USB cable.

2. Windows will recognize the instrument and automatically install the relevant drivers. If the driver installation has been successful, then the Windows Device Manager will list the following driver (see

Figure 30)

Michell Instruments USB to UART Bridge Controller

3. Launch the application software and choose one of the following types of connection:

Auto Detect – The application software will attempt to nd the correct COM port automatically.

Manual – Choose the appropriate COM port from the drop down list, as shown in the Windows Device Manager (see

APPLICATION SOFTWARE

Figure 30).

4. Click the OK button to proceed to the next screen.

Figure 29

Windows Device Manager Screen

Michell Instruments 39

APPLICATION SOFTWARE

4.2.2 Ethernet Communication

1. Configure the network settings of the instrument. Refer to Section

3.2.13.

2. Connect the S8000 RS to the network using the supplied Ethernet cable.

3. Launch the application software and choose the Network Connection option.

4. Click the TCP Settings button to enter the IP address of the instrument.

5. Click the Test button. If communication with the instrument is successful then proceed to the next screen by clicking the OK

button, otherwise check network settings and try again.

S8000 RS User’s Manual S8000 RS User’s Manual

Figure 30

Network Settings Screen

40 97315 Issue 9, April 2019

4.3 Data Acquisition or Edit Variables Mode

Once communication has been established, the Options Screen is displayed.

APPLICATION SOFTWARE

Figure 31

Options Screen

Michell Instruments 41

APPLICATION SOFTWARE

4.3.1 Data Acquisition

This mode of operation allows all measured instrument parameters to be graphed and logged in real time.

S8000 RS User’s Manual S8000 RS User’s Manual

Figure 32

Data Acquisition Control Toolbar

Data Acquisition Screen

Name Description

Run

Pause Pause data acquisition Stop Stop data acquisition Plot and log interval Time in seconds between graph and log file updates

Log filename

DCC

Maxcool

Standby

Begin data acquisition and logging A filename must be first be selected to enable data logging

Path and filename of the log file Click the small folder icon next to this text box to create a new log file

Initiate a DCC cycle Refer to Section 3.4.3 for detailed information on the DCC function

Toggle between Maxcool and Measure mode Refer to Section 3.4.4 for detailed information on the Maxcool function

Toggles between Standby and Measure mode Refer to Section 3.4.8 for detailed information on the Standby function

Table 15

Data Acquisition Control Description

42 97315 Issue 9, April 2019

APPLICATION SOFTWARE

Instrument readings and status

This area displays all measured instrument parameters and shows the status of the Fault, Process and Sensor Cooler Alarm.

Graph Controls

Name Description

Plot Automatically advances the graph as new data is acquired

Dragging the mouse on the graph scrolls along the time axis

Scroll Time

Zoom Time

Scroll Y

Zoom Y

Zoom Box Zooms in on both axes in the user selected area

Show time/Y

Options Displays the chart options window Copy Copies the chart to the clipboard as a bitmap file

Drag to the left to scroll forwards Drag to the right to scroll backwards

Dragging the mouse on the graph changes the scale of the time axis Drag to the left to increase the scale size Drag to the right to decrease the scale size

Dragging the mouse on the graph scrolls along the Y axis Drag down to scroll up Drag up to scroll down

Dragging the mouse on the graph changes the scale of the Y axis Drag up to increase the scale size Drag down to decrease the scale size

Select a parameter from the legend on the right hand side of the graph Dragging the mouse along the graph will move the vertical cursor along the time axis The Y value for the selected parameter at the position of the cursor will be displayed above the graph

Table 16

Graph

Plots the parameters selected by the user in the chart options window.

Status Bar

Graph Control Description

Name Description

Acquisition state

Number of readings

Next reading countdown

Log file Full path of the log file (if specified)

Indicates whether data acquisition is running, paused or stopped, with the messages RUNNING, PAUSED or IDLE

Number of readings taken since starting the current acquisition session

Countdown timer (in seconds), which indicates when the next reading will be taken

Table 17

Status Bar Description

Michell Instruments 43

APPLICATION SOFTWARE

4.3.2 Variable Edit

The variable edit mode allows the instrument configuration to be changed through the application software. On launch, it will automatically read and display the current values of each of the instrument variables.

Note: The variables are not periodically updated on-screen. To obtain up-todate values, click the Read button.

Editing variables

To edit a variable, first click on it to highlight it.

If the variable has a fixed list of options, a drop-down arrow will appear in the righthand column. Choose a new value from the drop-down list provided.

If the variable does not have a fixed list of options, type the new value into the righthand column text input area.

S8000 RS User’s Manual S8000 RS User’s Manual

NOTE: The variable background colour will turn pink to indicate it has been changed on-screen and is pending upload to the instrument.

Click the Write button to upload changed values to the instrument.

NOTE: Variable values and formatting are checked by the application software before they are uploaded to the instrument.

A message box will report any errors found.

Once a modified value has been written to the instrument, the background colour will return to white.

44 97315 Issue 9, April 2019

APPLICATION SOFTWARE

Figure 33

Variables Editor Screen

Michell Instruments 45

MAINTENANCE

DANGER

Electric

Shock Risk

5 MAINTENANCE

There are few user-serviceable parts on the S8000 RS. These include removal and replacement of the AC power supply fuse and cleaning the sensor mirror.

Safety

S8000 RS User’s Manual S8000 RS User’s Manual

This equipment operates from power supply voltages that

can be lethal and at pressures (depending upon application)

that could cause injury.

Ensure that any test installation meets the standards

described in Section 2.3 of this manual.

Under NO circumstances should the instrument case be

removed or the air vents covered or in any way restricted.

Maintenance and repair, other than that described in this

section, must only be carried out by trained personnel and

the instrument should be returned to the manufacturer for

this purpose.

5.1 Fuse Replacement

If the instrument fails to operate after it has been connected to an AC power supply (85 to 264 V AC, 47/63 Hz) and switched on, proceed as follows:

1. If the power supply cable is fitted with a fused plug, switch off the power supply and remove the plug. Check and, if necessary, replace the fuse. If, after fitting a new fuse and switching the power supply on, the instrument still fails to operate, proceed as follows.

Figure 34

Fuse Replacement

2. Switch the instrument’s ON/OFF switch to OFF, isolate the external power supply and remove the IEC power connector from the instrument’s power socket.

3. Locate the fuse carrier and pull it out of the connector housing. A small screwdriver inserted under the lip may be useful in order to lever it out.

46 97315 Issue 9, April 2019

MAINTENANCE

4. Replace the fuse cartridge. NOTE: It is essential that a fuse of the correct type and rating is fitted to the instrument (fuse - 3.15A, Anti-Surge, Glass, 20mm x 5mm).

5. Fit a new fuse cartridge into the fuse carrier and push the fuse carrier back into the power connector housing.

6. Replace the IEC power connector into the power socket, switch on the external power supply and switch on the instrument. Check that the instrument is now operational. If the fuse blows immediately on switch-on either contact the manufacturer or their service agent.

DO NOT ATTEMPT ANY FURTHER SERVICING PROCEDURES

Michell Instruments 47

MAINTENANCE

5.2 Sensor Mirror Cleaning

Before disassembling the sensor it is important to

Failure to follow this warning may result in operator injury

Throughout the life of the instrument, periodic cleaning of the mirror surface and optics window may be required. The frequency of this depends upon operating conditions and the potential in the application for contaminants to be deposited on the mirror. Sensor cleaning is mandatory if the instrument indicates an optics fault. The cleaning procedure is as follows:

S8000 RS User’s Manual S8000 RS User’s Manual

Warning

de-pressurize the sensor head.

or damage to the instrument.

Figure 35

1. Switch off the instrument and unscrew the large stainless steel sensor cover (1) on the front of the instrument.

2. Carefully pull the optics block (2) out to reveal the mirror (3). Clean the mirror surface and optics window with a cotton bud/ QTip soaked in distilled water. If the sensor has been exposed to oil based contamination then use one of the following solvents: methanol, ethanol, or isopropyl alcohol. To avoid damage to the mirror surface, do not press too firmly on the cotton bud/Q-Tip when cleaning. Allow the cleaning solvent to fully evaporate.

Sensor Mirror Cleaning

3. If alcohol has been used to clean the mirror then always follow by cleaning with distilled water.

4. Replace the optics block, taking care to align the gold contacts on the block with the gold contacts on the instrument.

5. Replace the large stainless steel cover, screwing it in firmly but taking care not to overtighten it.

48 97315 Issue 9, April 2019

6 GOOD MEASUREMENT PRACTICE

6.1 Sampling Hints

Ensuring reliable and accurate moisture measurements requires the correct sampling techniques, and a basic understanding of how water vapour behaves. This section aims to explain the common mistakes and how to avoid them.

Sampling Materials – Permeation and Diffusion

All materials are permeable to water vapour since water molecules are extremely small compared to the structure of solids, even including the crystalline structure of metals. The graph below demonstrates this effect by showing the increase in dew point temperature seen when passing very dry gas through tubing of different materials, where the exterior of the tubing is in the ambient environment.

MAINTENANCE

Figure 36

What this demonstrates is the dramatic effect that different tubing materials have on the humidity levels of a gas passed through them. Many materials contain moisture as part of their structure and when these are used as tubing for a dry gas the gas will absorb some of the moisture. Always avoid using organic materials (e.g. rubber), materials containing salts and anything which has small pores which can easily trap moisture (e.g. nylon).

As well as trapping moisture, porous sampling materials will also allow moisture vapour to ingress into the sample line from outside. This effect is called diffusion and occurs when the partial water vapour pressure exerted on the outside of a sample tube is higher than on the inside. Remember that water molecules are very small so in this case the term ‘porous’ applies to materials that would be considered impermeable in an everyday sense – such as polyethylene or PTFE. Stainless steel and other metals can be considered as practically impermeable and it is surface finish of pipework that becomes the dominant factor. Electropolished stainless steel gives the best results over the shortest time period.

Take into consideration the gas you are measuring, and then choose materials appropriate to the results you need. The effects of diffusion or moisture trapped in materials are more significant when measuring very dry gases than when measuring a sample with a high level of humidity.

Material permeability comparison

Michell Instruments 49

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.

S8000 RS User’s Manual S8000 RS User’s Manual

Adsorption

solid to the surface of a material, creating a film. The rate of adsorption is increased at higher pressures and lower temperatures.

Desorption

constant environmental conditions, an adsorbed substance will remain on a surface almost indefinitely. However, as the temperature rises, so does the likelihood of desorption occurring.

Ensuring the temperature of the sampling components is kept at consistent levels is important to prevent temperature fluctuation (i.e. through diurnal changes) continually varying the rates of adsorption and desorption. This effect will manifest through a measured value which increases during the day (as desorption peaks), then decreasing at night as more moisture is adsorbed into the sampling equipment.

is the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved

is the release of a substance from or through the surface of a material. In

Dew Point > T

Dew Point < T

If temperatures drop below the sample dew point, water may condense in sample tubing and affect the accuracy of measurements.

Maintaining the temperature of the sample system tubing above the dew point of the sample is vital to prevent condensation. Any condensation invalidates the sampling process as it reduces the water vapour content of the gas being measured. Condensed liquid can also alter the humidity elsewhere by dripping or running to other locations where it may re-evaporate.

Although ambient pressure does not change drastically in a single location, the gas sample pressure does need to be kept constant to avoid inconsistencies introduced by adsorption or desorption. The integrity of all connections is also an important consideration, especially when sampling low dew points at an elevated pressure. If a small leak occurs in a high-pressure line, gas will leak out, however, vortices at the leak point and a negative vapour pressure differential will also allow water vapour to contaminate the flow.

50 97315 Issue 9, April 2019

GOOD MEASUREMENT PRACTICE

Theoretically flow rate has no direct effect on the measured moisture content, but in practice it can have unanticipated effects on response speed and accuracy. An inadequate flow rate may:

• 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.

• Increase the chance of contamination from back diffusion. Ambient air that is wetter than the sample can flow from the exhaust back into the system. A longer exhaust tube can help alleviate this problem.

• Slow the response of the sensor to changes in moisture content.

An excessively high flow rate can:

• Introduce back pressure, causing slower response times and unpredictable changes in dew point

• Result in a reduction in depression capabilities in chilled mirror instruments by having a cooling effect on the mirror. This is most apparent with gases that have a high thermal conductivity such as hydrogen and helium.

System design for fastest response times

The more complicated the sample system, the more areas there are for trapped moisture to hide. The key pitfalls to look out for here are the length of the sample tubing and dead volumes.

The sample point should always be as close as possible to the critical measurement point to obtain a truly representative measurement. The length of the sample line to the sensor or instrument should be as short as possible. Interconnection points and valves trap moisture, so using the simplest sampling arrangement possible will reduce the time it takes for the sample system to dry out when purged with dry gas.

Over a long tubing run, water will inevitably migrate into any line, and the effects of adsorption and desorption will become more apparent.

Dead volumes (areas which are not in a direct flow path) in sample lines, hold onto water molecules which are slowly released into the passing gas. This results in increased purge and response times, and wetter than expected readings. Hygroscopic materials in filters, valves (e.g. rubber from pressure regulators) or any other parts of the system can also trap moisture. Plan your sampling system to ensure that the sample tap point and the measurement point are as close as possible to avoid long runs of tubing and dead volumes.

Filtration

All trace moisture measurement instruments and sensors are by their nature sensitive devices. Many processes contain dust, dirt or liquid droplets. Particulate filters are used for removing dirt, rust, scale and any other solids that may be in a sample stream. For protection against liquids, a coalescing or membrane filter should be used. The membrane provides protection from liquid droplets and can even stop flow to the analyser completely when a large slug of liquid is encountered, saving the sensor from potentially irreparable damage.

Michell Instruments 51

GOOD MEASUREMENT PRACTICE

7 CALIBRATION

7.1 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 one of their approved agents (see www.michell.com for contact details).

The DCC function can be disabled for calibration purposes (refer to Section 3.4.3).

A calibration certificate bearing a four point calibration is issued with each instrument. If required, an option is available to add further specific calibration points. Contact Michell Instruments for further information (www.michell.com).

S8000 RS User’s Manual S8000 RS User’s Manual

Figure 37

Typical Calibration Certificate

52 97315 Issue 9, April 2019

Appendix A

CALIBRATION

Technical Specifications

Michell Instruments 53

APPENDIX A

Appendix A Technical Specifications

Dew-Point Sensor Performance

Measurement Technology Chilled Mirror

Measurement Range

Measurement Accuracy* ±0.1°C (±0.18°F) Reproducibility ±0.05°C (±0.09°F) Mirror Gold plated copper Temperature Measurement 4 wire Pt100, 1/10 DIN class B Sample Flow Rate 500 to 1000 ml/min (1 to 2.1 scfh) Sample Gas Pressure 1 MPa (10 barg / 145 psig) max

Remote PRT

Temperature Measurement 4 wire Pt100, 1/10 DIN class B Measurement Accuracy ±0.1°C (±0.18°F) Cable Length 2m (6.6ft) (250m (820ft) max)

Flow Sensor

Measurement Range 0 to 1000 ml/min (0 to 2.1 scfh)

RS80: -80 to +20°Cdp (-112 to +68°Fdp) RS90: -90 to +20°Cdp (-130 to +68°Fdp)

S8000 RS User’s Manual S8000 RS User’s Manual

Optional Integrated Pressure Sensor

Measurement Range 0 to 1.6 MPa (0 to 16 bara / 0 to 232 psia) Measurement Accuracy 0.25% Full Scale Measurement Units barg, psig, kPa, MPa

Monitor

Resolution User selectable to 0.001, depending on parameter

Moisture: °Cdp or °Fdp, % RH, g/m3, g/kg, ppmV, ppmW (SF6)

Measurement Units

Outputs

HMI 5.7” LCD with touchscreen, white on blue graphics

Data Logging

Environmental Conditions +5 to +30°C (+41 to +86°F) max 80% RH Power Supply 85 to 264 V AC, 47/63 Hz Power Consumption 250 VA

Temperature: °C or °F Pressure: barg, psig, kPa, MPa

Analog: Three channels, user selectable 4-20 mA, 0-20 mA or 0-1 V Digital: USB and Modbus TCP (over Ethernet) Alarm: Two volt free changeover contacts, one process alarm, one fault

alarm; 1 A @ 30 V DC

SD Card (512 Mb supplied) and USB interface. Supports SD Card (FAT-32) - 32 Gb max. that allows 24 million logs or 560 days, logging at 2 second intervals

Mechanical Specification

Dimensions 188.9 x 440 x 479.3mm (7.358 x 17.323 x 18.870") (h x w x d) Weight 22.4kg (49.38lbs) Sample Gas Circuit 316 Stainless steel

Sample Gas Connections

Optional Integrated Sample Pump

Inlet: 1/4" VCR (MALE) Outlet: 1/4" Swagelok (MALE)

Flow rate:

1.4l/min maximum Sample gas connections: 1/4” Swagelok (MALE) with bypass loop

General

Calibration

* Measurement accuracy means maximum deviation between instrument under test and corrected

5-point in-house calibration, national standards traceable as standard UKAS accredited calibrations optional – please consult factory

54 97315 Issue 9, April 2019

APPENDIX A

186.9 mm

7.358 ins

36.6 mm

1.4 ins

479.3 mm

18.870 ins

46.0 mm

1.811 ins

178.5 mm

7.028 ins

440.0 mm

17.323 ins

177.0 mm

6.969 ins

144.5 mm

5.689 ins

36.6 mm

1.4 ins

479.3 mm

18.870 ins

reference. To this must be added the uncertainties associated with the calibration system and the environmental conditions during testing or subsequent use.

-10

-20

-30

-40

-50

Temperature (ºC)

-60

-70

-80

-90

-100

-110

Sensor Cooler Maximum Depression

Figure 38

Operational Range

Michell Instruments 55

Figure 39

S8000 RS Dimensions

APPENDIX B

S8000 RS User’s Manual S8000 RS User’s Manual

Appendix B

Default Set-Up Parameters

56 97315 Issue 9, April 2019

Appendix B Default Set-Up Parameters

Sub Menu Parameter Value Unit

APPENDIX B

MAIN SCREEN

DCC

LOGGING

DISPLAY

OUTPUTS

Top Readout Parameter Mid Readout Parameter Bottom Readout Parameter

Display Hold Period/Duration Setpoint Interval/Measurement Time Output Hold/Hold Duration

Interval 5 seconds

Resolution Primary Unit/Temperature Unit Pressure Unit Stability Time

FAST

PRT Mode Language Brightness/Display Contrast

Output 1 Parameter Output 2 Parameter Output 3 Parameter Output 1 Type Output 2 Type Output 3 Type Output 1 Min Output 1 Max Output 2 Min Output 2 Max Output 3 Min Output 3 Max

Dewpoint ppm

Flow

0 (Off)

ºC bara

On Internal English 100

Dewpoint ppm

Flow 4-20 mA 4-20 mA 4-20 mA

-80 20 0 3000 0 1000

minutes minutes ºC hours minutes

decimal places

minute

ºC ºC ppm

ppm

ml/min ml/min

ALARM

COOLER

Parameter Setpoint

Mode Setpoint

Dewpoint 0 ºC

Automatic N/A

Table 18

Default Set-Up Parameters

Michell Instruments 57

APPENDIX C

S8000 RS User’s Manual S8000 RS User’s Manual

Appendix C

Modbus Holding

58 97315 Issue 9, April 2019

APPENDIX C

Appendix C Modbus Holding Register Map

All the data values relating to the S8000 RS are stored in holding registers. Each of these registers is two bytes (16-bits wide). Some of these registers contain instrument specific values e.g. its own unique system address, IP address values, etc. Others registers hold specific real time data e.g. measured dew-point and temperature.

Each Modbus message has a two part address code, one for the low byte (bits 0 through 7) and one for the high byte (bits 8 through 15). The facility exists for multiple registers, specified by a high and low byte contained in the query message, to be addressed and read by the same message.

The table below describes the instruments' registers with their respective address locations, together with their relevant register configurations and register map definitions. Note: Hexadecimal (Hex)

addresses marked with an asterisk denote instrument specific parameters stored in the instrument’s flash memory.

The register maps below the table define the data allocated to each bit/byte for each register type.

Address

Dec

Address

Hex

Function Read/

Write

Default

Value

Confi-

guration

0 0000* Instrument Address R/W 0001H H INSTID 1 0001 Dew point Value – Hi Word R N HUMIDITY_HI

2 0002

3 0003

4 0004

5 0005 RH R A RH 6 0006 Pressure Value R J PRESSURE 7 0007 PpmV – Hi Word R N PPMV_HI 8 0008 PpmV – Lo Word R N PPMV_LO 9 0009 PpmW(sf6) – Hi Word R N PPMWSF_HI

10 000A PpmW(sf6) – Lo Word R N PPMWSF_LO 11 000B g/m3 - Hi Word R N GM3_HI 12 000C g/m3 - Lo Word R N GM3_LO

13 000D g/kg – Hi Word R N GKG_HI 14 000E g/kg – Lo Word R N GKG_LO 15 000F Flow Value R H FLOW_RATE 16 0010 Mirror Condition R J MIRROR_COND 17 0011 Heat Pump Drive R H HP_DRIVE 18 0012 Status R D STATUS

19 0013*

20 0014*

21 0015 Phase Time Hours R L PHASE_TIME_HRS

22 0016

23 0017* Film thickness setting R/W A FILM_THICKNESS

Dew point Value – Lo Word

Ambient Temperature – Hi Word

Ambient Temperature – Lo Word

DCC period + Hold Time Duration minutes

DCC Interval Hours + Minutes

Phase Time Minutes + Phase Time Seconds

R N HUMIDITY_LO

R N AMBTEMP_HI

R N AMBTEMP_LO

R/W K DCC_HOLD_TIME

R/W K MEASURE_TIME

R K

PHASE_TIME_ MIN_SEC

Michell Instruments 59

APPENDIX C

S8000 RS User’s Manual S8000 RS User’s Manual

24 0018 Live film thickness value R A

25 0019*

26 001A*

27 001B*

28 001C*

29 001D*

30 001E*

31 001F*

32 0020*

33 0021* Logging Interval R/W H LOG_INTERVAL 34 0022* Units/ Command R/W E UNITSCOMMAND

35 0023*

36 0024* Emitter Drive R/W H EMITTERDRIVE 37 0025 Stability Time R/W H STABILITY_TIME

38 0026

39 0027

40 0028

41 0029* Display Setting 1 R/W F

42 002A* Display Setting 2 R/W F

43 002B N/A 44 002C N/A 45 002D N/A 46 002E Filename DDMM or MMDD R L FILENAME_DDMM 47 002F Filename HHMM R L FILENAME_HHMM 48 0030* Firmware Version Number R A FIRM_VER 49 0031 N/A 50 0032 N/A 51 0033* N/A

52 0034*

53 0035* Process Alarm Set Point R/W M

181

182

Analog 1 output maximum value

Analog 1 output minimum value

Analog 2 output maximum value

Analog 2 output minimum value

Analog 3 output maximum value

Analog 3 output minimum value

Analog output configuration 1

Analog output configuration 2

Mirror Temp Set-Point during DCC

RTC Year(val1) + Month (val2)

RTC Date (val1) + Hours(val2)

RTC Mins(val1) + Secs (val2)

Process Alarm Configuration / Display Brightness.

IP Address – octets 1 and 2

IP Address – octets 3 and

R/W M MAX_MA1

R/W M MIN_MA1

R/W M MAX_MA2

R/W M MIN_MA2

R/W M MAX_MA3

R/W M MIN_MA3

R/W B OP_SELECTION1

R/W B OP_SELECTION2

R/W A

R/W K YEARMONTH

R/W K DATEHRS

R/W K MINSSECS

R/W P

R/W n/a T IPADDR1

R/W n/a T IPADDR2

LIVE_FILM_ THICKNESS

MIRROR_TEMP _SETP

DISPLAY_ SETTING1

DISPLAY_ SETTING2

ALARMCONFIG_ DISPCONT

PROCESSALARM_ SP_HI

60 97315 Issue 9, April 2019

APPENDIX C

Sign bit = 1 for –ve values (signed int) 7FFF = 327.67 8000 = -327.68 The value in bits (15 to 0) + 1 is divided by 100 to give 0.01 resolution for dew point and temperature values







Value

183

184

185

186

187 Ethernet Status R/W 0x0000 U ETHSTATUS

Default Gateway– octets 1 and 2

Default Gateway – octets 3 and 4

Subnet Mask – Hi Word octets 1 and 2

Subnet Mask – Lo Word octets 3 and 4

Table 19

R/W n/a T DGADDR1

R/W n/a T DGADDR2

R/W n/a T NMASK1

R/W n/a T NMASK2

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

r r r r r r r r r r r r r r r r

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Analog O/P 2 Analog O/P 1

r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w

DP = 00000000 temp = 00000001 Ppm(V) = 00000010 Ppm(W) sf6 = 00000011 g/kg = 00000100

g/m

= 00000101 pressure = 00000110 flow = 00000111 rh = 00001000 temp difference = 00001001

DP = 00000000 temp = 00000001 Ppm(V) = 00000010 Ppm(W) sf6 = 00000011 g/kg = 00000100 g/m3 = 00000101 pressure = 00000110 flow = 00000111 rh = 00001000 temp difference = 00001001

Michell Instruments 61

APPENDIX C

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w

Analog O/P 3

00 = 0- 20mA

01= 4-20mA

10 = 0-1V

Analog O/P 2

00 = 0- 20mA

01= 4-20mA

10 = 0-1V

Analog O/P 1

00 = 0- 20mA

S8000 RS User’s Manual S8000 RS User’s Manual

Analog O/P 3

DP = 00000000 temp = 00000001 Ppm(V) = 00000010 Ppm(W) sf6 = 00000011 g/kg = 00000100 g/m3 = 00000101 pressure = 00000110 flow = 00000111 rh = 00001000

01= 4-20mA

10 = 0-1V

temp difference = 00001001

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

r/w r/w r/w r/w r/w r r r r/w r/w r r r r r r

1= Optics Reset

1= Display hold

1= Max Cool Initiate

1= DCC initiate

(toggle ON/OFF)

1= Start Logging

0= Stop Logging

1= FAST

(Frost Assurance)

1= Fault Alarm

1= Humidity Alarm

1= External PRT

1= Initiate Standby

In-control = 00

Heating = 01

Cooling = 10

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w

Language ENGLISH GERMAN SPANISH FRENCH ITALIAN PORTUG

USA

RUSSIAN CHINESE

3 4 5 6 13 15

Measurement = 0000

DCC = 0001

Data Hold = 0010

Max Cool = 0100

Standby = 1000

Reset defaults

1 = FAST Enable

1 DP = 00H

2 DP = 01H

3 DP = 10H

N/A

SENSOR COOLER AUTO/MANUAL

M  1, A  0

Psig = 00H

Bara = 01H

Kpa = 10H

Mpag = 11H

Moisture Content Calculation

0 = dry basis; 1 = wet basis

%rh calculation over water/ice

0= over water

N/A

°C = 0

62 97315 Issue 9, April 2019

°F = 1

APPENDIX C

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Display 2 Display 1

r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w

DP = 00000000 temp = 00000001 Ppm(V) = 00000010 Ppm(W) sf6 = 00000011 g/kg = 00000100

g/m

= 00000101 pressure = 00000110 flow = 00000111 rh = 00001000 temp difference = 00001001

DP = 00000000 temp = 00000001 Ppm(V) = 00000010 Ppm(W) sf6 = 00000011 g/kg = 00000100

g/m

= 00000101 pressure = 00000110 flow = 00000111 rh = 00001000 temp difference = 00001001

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Main Value to Log Display 3

r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w

DP, Temp, Press and Flow are logged by default

DP = 00000000 temp = 00000001 Ppm(V) = 00000010

Ppm(V) = 00000010 Ppm(W) sf6 =00000011 g/kg = 00000100 g/m3 = 00000101 rh = 00001000 temp difference = 00001001

Ppm(W) sf6 = 00000011 g/kg = 00000100 g/m3 = 00000101 pressure = 00000110 flow = 00000111 rh = 00001000 temp difference = 00001001

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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Unsigned integer. Range = 0 to 65535

Michell Instruments 63

APPENDIX C





Val 1 Val 2





Val 1 Val 2

Sign bit = 1 for –ve values (signed int) 7FFF = 32767 8000 = -32768







Value

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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S8000 RS User’s Manual S8000 RS User’s Manual





Value



Sign bit = 1 for –ve values (signed int) 7FFF = 3276.7 8000 = -3276.8 The value in bits (15 to 0) + 1 is divided by 10 to give 0.1 resolution for dew point and temperature values.

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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Val 1 & 2 are in BCD, therefore 10H = 10, 58H = 58 and 09H = 9 etc., so as a result A to F are not valid values

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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Values in HEX i.e. 17th March = 11H for Val1 and 03H for Val2

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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64 97315 Issue 9, April 2019

APPENDIX C

The humidity values for sensors 1 & 2 are represented in IEEE-754 single precision floating point format, in order to cater for the wide range in the value of ppm(v). This format is 'Big Ended' which means that the Hi byte is at a lower address in memory than the Lo byte, and is represented as such in the register memory map. The IEEE-754 format is shown below:

Bit 31

Sign Bit

0 = +

1 = -

Examples of floating point to HEX are shown below:

Example 1 +10.3

Sign bit = 0 Exponent = 3, therefore exponent field = 127 + 3 = 130, and bits 30 to 23 =10000010

The mantissa = 1.2875 which in binary representation = 1.01001001 1001 1001 1001 101

Adjusting the mantissa for the exponent moves the decimal point to the right if positive and to the left if negative

As the exponent is = 3 then the mantissa becomes = 1010.0100 1100 1100 1100 1101, therefore:-

Bits 30 to 23

Exponent Field

Has a +127 bias value

Bits 22 to 0

Mantissa

Decimal representation of binary

Where 1.0 ≤ value < 2.0

1010 = (1x23 + (0x22) + (1x21) + (0x20) = 10 and

0100 1100 1100 1100 1101 = (0x2-1) +(1x2-2) +....+ (1x2-20) = 0.3

Therefore the word value = 0100 0001 0010 0100 1100 1100 1100 1101 = 4124CCCD

Consequently for sensor 1, register 0001 = 4124 and register 0002 = CCCD

Example 2 - 0.0000045

Sign bit = 1 Exponent = -18, therefore exponent field = 127 + (-18) = 109, and bits 30 to 23 =

01101101

The mantissa = 1.179648 which in binary representation = 1.00101101111111010110101

i.e. (1x2-18) +(1x2-21) + (1x2-23) etc = 0.0000045

Therefore the word value = 1011 0110 1001 0110 1111 1110 1011 0101 = B696FEB5

Consequently for sensor 1 register 0001 = B696 and register 0002 = FEB5

Michell Instruments 65

APPENDIX D

S8000 RS User’s Manual S8000 RS User’s Manual

Appendix D

Quality, Recycling

& Warranty

Information

66 97315 Issue 9, April 2019

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.michell.com/compliance

This page contains information on the following directives:

• ATEX Directive

• Calibration Facilities

• Conflict Minerals

• FCC Statement

• Manufacturing Quality

• Modern Slavery Statement

• Pressure Equipment Directive

• REACH

• RoHS2

• WEEE2

• Recycling Policy

• Warranty and Returns

This information is also available in PDF format.

Michell Instruments 67

APPENDIX E

S8000 RS User’s Manual S8000 RS User’s Manual

Appendix E

Analyzer Return Document

Decontamination Declaration

68 97315 Issue 9, April 2019

APPENDIX E

Appendix E Analyzer Return Document & Decontamination Declaration

Decontamination Certicate

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.

Instrument Serial Number

Warranty Repair? YES NO Original PO #

Company Name Contact Name

Address

Telephone # E-mail address

Reason for Return /Description of Fault:

Has this equipment been exposed (internally or externally) to any of the following? Please circle (YES/NO) as applicable and provide details below

Biohazards YES NO

Biological agents YES NO

Hazardous chemicals YES NO

Radioactive substances YES NO

Other hazards YES NO

Please provide details of any hazardous materials used with this equipment as indicated above (use continuation sheet if necessary)

Your method of cleaning/decontamination

Has the equipment been cleaned and decontaminated? YES NOT NECESSARY

Michell Instruments will not accept instruments that have been exposed to toxins, radio-activity or bio-hazardous

materials. For most applications involving solvents, acidic, basic, ammable or toxic gases a simple purge with dry gas (dew point <-30°C) over 24 hours should be sufcient to decontaminate the unit prior to return.

Work will not be carried out on any unit that does not have a completed decontamination declaration.

Decontamination Declaration

I declare that the information above is true and complete to the best of my knowledge, and it is safe for Michell personnel to service or repair the returned instrument.

Name (Print) Position

Signature Date

F0121, Issue 2, December 2011

Michell Instruments 69

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Michell Instruments S8000-RS Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual