Michell Instruments S8000 Operating Manual

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S8000

Chilled Mirror Hygrometer

User’s Manual

97488 Issue 4

August 2018

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S8000

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S8000 User’s Manual

Contents

Safety ................................................................................................................................ix

Electrical Safety ...........................................................................................................ix

Pressure Safety ............................................................................................................ix

Toxic Materials .............................................................................................................ix

Repair and Maintenance ...............................................................................................ix

Calibration ...................................................................................................................ix

Safety Conformity ........................................................................................................ix

Abbreviations ...................................................................................................................... x

Warnings ............................................................................................................................ x

1 INTRODUCTION ................................................................................................1

1.1 Operating Principle ............................................................................................. 2

2 INSTALLATION ..................................................................................................3

2.1 Safety ................................................................................................................ 3

2.2 Unpacking the Instrument ................................................................................... 3

2.3 Operating Requirements ..................................................................................... 5

2.3.1 Environmental Requirements ......................................................................... 5

2.3.2 Electrical Requirements ................................................................................. 5

2.4 Exterior Layout ................................................................................................... 5

2.5 Rear Panel Connections (All Versions) .................................................................. 8

2.5.1 Power Supply Input ....................................................................................... 9

2.5.2 Analog Output Connections .......................................................................... 10

2.5.3 Alarm Output Connections ........................................................................... 11

2.5.4 Remote PRT Probe (Optional) ..................................................................... 13

2.5.5 4-Wire PRT Output (Optional) ...................................................................... 14

2.5.6 USB Communications Port Connector ............................................................ 14

2.5.7 Ethernet Port (Optional) .............................................................................. 15

2.5.8 RS232/485 Port (Optional) ........................................................................... 15

2.5.9 Connection of Gas Supplies .......................................................................... 17

2.6 Internal Sample Pump (Optional) ....................................................................... 19

2.7 Conversion of S8000 to Rack Mount .................................................................. 20

3 OPERATION ....................................................................................................21

3.1 General Operational Information ........................................................................ 21

3.2 Instrument Display ........................................................................................... 22

3.2.1 Main Screen ................................................................................................ 23

3.2.2 Customizable Readouts................................................................................ 24

3.2.3 Operational Status Display ........................................................................... 24

3.2.4 Setup Menu Screen ..................................................................................... 25

3.2.5 Menu Structure .......................................................................................... 27

3.2.6 DCC ........................................................................................................... 28

3.2.7 LOGGING ................................................................................................... 29

3.2.8 OUTPUTS ................................................................................................... 31

3.2.9 ALARM ....................................................................................................... 31

3.2.10 DISPLAY .................................................................................................... 32

3.2.11 CLOCK ....................................................................................................... 33

3.2.12 ABOUT (Network Settings) ........................................................................... 33

3.3 Operational Functions ....................................................................................... 34

3.3.1 Operating Cycle .......................................................................................... 34

3.4 Operating Guide ............................................................................................... 35

3.4.1 DCC - Dynamic Contamination Control .......................................................... 35

3.4.2 MAXCOOL Function ..................................................................................... 36

3.4.3 Pressure Compensation ............................................................................... 36

iv 97488 Issue 4, August 2018

S8000 User’s Manual

3.4.4 Data Logging .............................................................................................. 36

3.4.5 Frost Assurance System Technology (FAST) .................................................. 37

3.4.6 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 RS232/485 Communication .......................................................................... 40

4.2.3 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 Safety .............................................................................................................. 46

5.2 Fuse Replacement ........................................................................................... 47

5.3 Sensor Mirror Cleaning ...................................................................................... 48

5.3.1 Releasing optics window ............................................................................. 49

5.3.2 Fitting the Microscope (Optional) .................................................................. 50

6 GOOD MEASUREMENT PRACTICE .....................................................................51

6.1 Sampling Hints ................................................................................................. 52

7 CALIBRATION ..................................................................................................55

7.1 Traceability ...................................................................................................... 55

8 PREPARATION FOR SHIPPING ..........................................................................56

Michell Instruments v

S8000 User’s Manual

Tables

Table 1 Front Panel Controls and Indicators ..............................................................6

Table 2 Rear Panel Controls and Indicators ...............................................................8

Table 3 Main Screen Description ............................................................................. 23

Table 4 Operational Status Display ........................................................................24

Table 5 DCC Parameters ........................................................................................28

Table 6 Logging Parameters ................................................................................... 29

Table 7 SD Card Status Indicators .......................................................................... 30

Table 8 Outputs Parameters ................................................................................... 31

Table 9 Alarm Parameters ...................................................................................... 31

Table 10 Display Parameters .................................................................................... 32

Table 11 Clock Parameters .......................................................................................33

Table 12 Network Parameters .................................................................................. 33

Table 13 Data Acquisition Control Description ...........................................................42

Table 14 Graph Control Description .......................................................................... 43

Table 15 Status Bar Description ...............................................................................43

Table 16 Modbus Holding Register Map ....................................................................69

Table 17 Register Conﬁ guration A ............................................................................ 70

Table 18 Register Conﬁ guration B1 ...........................................................................70

Table 19 Register Conﬁ guration B2 ...........................................................................70

Table 20 Register Conﬁ guration D Status Word ......................................................... 71

Table 21 Register Conﬁ guration E Units ....................................................................71

Table 22 Register Conﬁ guration F Display Setting A ...................................................71

Table 23 Register Conﬁ guration F Display Setting B ................................................... 72

Table 24 Register Conﬁ guration H ............................................................................72

Table 25 Register Conﬁ guration J .............................................................................72

Table 26 Register Conﬁ guration K ............................................................................ 72

Table 27 Register Conﬁ guration L .............................................................................73

Table 28 Register Conﬁ guration M ............................................................................ 73

Table 29 Register Conﬁ guration N ............................................................................73

Table 30 Register Conﬁ guration P ............................................................................. 74

vi 97488 Issue 4, August 2018

S8000 User’s Manual

Figures

Figure 1 S8000 ........................................................................................................1

Figure 2 Operating Principle .....................................................................................2

Figure 3 S8000 Packing ............................................................................................3

Figure 4 Front Panel ................................................................................................6

Figure 5 Rear Panel .................................................................................................7

Figure 6 Power Supply Input ....................................................................................9

Figure 7 Analog Output Connectors ........................................................................10

Figure 8 Alarm Output Connectors ..........................................................................12

Figure 9 Remote PRT Connection ............................................................................13

Figure 10 Internal PRT Output (Optional) ..................................................................14

Figure 11 USB Port Connection .................................................................................14

Figure 12 Ethernet Port (Optional) ............................................................................15

Figure 13 RS232/485 Port (Optional) ........................................................................15

Figure 14 Gas Connections .......................................................................................17

Figure 15 Gas Connections when Pump is Fitted ........................................................ 19

Figure 16 Rack Fixing Method ..................................................................................20

Figure 17 Initialising Overlay Screen .........................................................................22

Figure 18 Main Screen .............................................................................................22

Figure 19 Main Screen Layout ..................................................................................23

Figure 20 Setup Menu Screen ..................................................................................25

Figure 21 Virtual Keyboard ...................................................................................... 26

Figure 22 Menu Structure ........................................................................................27

Figure 23 DCC Screen .............................................................................................. 28

Figure 24 Logging Screen ........................................................................................29

Figure 25 Outputs Screen ........................................................................................31

Figure 26 Alarm Screen ...........................................................................................31

Figure 27 Display Screen .........................................................................................32

Figure 28 Clock Screen ............................................................................................33

Figure 29 Network Settings Screen ...........................................................................33

Figure 30 Typical Operating Cycle .............................................................................34

Figure 31 Communications Setup Screen ..................................................................38

Figure 32 Windows Device Manager Screen ..............................................................39

Figure 33 Network Settings Screen ...........................................................................40

Figure 34 Options Screen .........................................................................................41

Figure 35 Data Acquisition Screen ............................................................................42

Figure 36 Variables Editor Screen .............................................................................45

Figure 37 Power Supply Fuse Replacement ...............................................................47

Figure 38 Sensor Mirror Cleaning ..............................................................................48

Figure 39 Releasing Optics Window ..........................................................................49

Figure 40 Fitting the Microscope ...............................................................................50

Figure 41 Typical Calibration Certiﬁ cate ..................................................................... 55

Figure 42 Instrument Packing Details ........................................................................56

Figure 43 Select Format ...........................................................................................62

Figure 44 Set Format Properties ...............................................................................62

Figure 45 Format Disc .............................................................................................62

Figure 46 Modbus Connection ..................................................................................67

Michell Instruments vii

S8000 User’s Manual

Appendices

Appendix A Technical Speciﬁ cations .............................................................................. 58

A.1 Dimensions ................................................................................. 60

Appendix B Formatting SD cards ................................................................................. 62

Appendix C Calculations ..............................................................................................64

C.1 Water Content ............................................................................. 64

C.2 Temperature - Dew Point ...........................................................64

C.3 °C to °F Calculation .................................................................... 64

C.4 % RH Calculation ........................................................................64

C.5 Conversion of bara to psia and kPa .............................................. 65

Appendix D Modbus RTU Communications ....................................................................67

D.1 Introduction ............................................................................... 67

D.2 Basic Modbus Operation .............................................................. 67

D.3 Modbus RTU Connections and Protocol .......................................... 68

D.4 Register Map .............................................................................. 68

Appendix E Default Values ........................................................................................... 76

Appendix F Quality, Recycling & Warranty Information ................................................... 78

Appendix G Return Document & Decontamination Declaration ........................................ 80

viii 97488 Issue 4, August 2018

S8000 User’s Manual

Safety

The manufacturer has designed this equipment to be safe when operated using the procedures detailed in this manual. The user must not use this equipment for any other purpose than that stated. Do not apply values greater than the maximum value stated.

This manual contains operating and safety instructions, which must be followed to ensure the safe operation and to maintain the equipment in a safe condition. The safety instructions are either warnings or cautions issued to protect the user and the equipment from injury or damage. Use qualiﬁ ed 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 Speciﬁ cations.

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 speciﬁ ed maximum safe working pressure is 1 barg (14.5 psig) for the low pressure version, or 20 barg (290 psig) for the high pressure version. This instrument is not designed to accept gas pressures higher than the speciﬁ ed maximum working pressure.

Application of gas pressures higher than the speciﬁ ed maximum will result in potential damage and may render the instrument unsafe and in a condition of incorrect functionality. Only personnel trained in the safe handling of high pressure gases should be allowed to operate this instrument. Refer to Appendix A - Technical Speciﬁ cations in this manual.

Toxic Materials

The use of hazardous materials in the construction of this instrument has been minimized. During normal operation, it is not possible for the user to come into contact with any hazardous substance, which might be employed in the construction of the instrument. Care should, however, be exercised during maintenance and the disposal of certain parts.

Repair and Maintenance

The instrument must be maintained either by the manufacturer or an accredited service agent. Refer to www.michell.com for details of Michell instruments' worldwide ofﬁ ces contact information.

Calibration

The recommended calibration interval for the S8000 is one year, unless otherwise speciﬁ ed by Michell Instruments Ltd. The instrument should be returned to the manufacturer, Michell Instruments, or one of their accredited service agents for re-calibration (go to www.michell.com for contact information).

Safety Conformity

This product meets the essential protection requirements of the relevant EU directives. Refer to Appendix A - Technical Speciﬁ cations - for details.

Michell Instruments ix

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) barg pressure unit (=100 kP or 0.987 atm) gauge bara pressure unit (absolute) °C degrees Celsius °F degrees Fahrenheit COM common dp dew point EU European Union g/Kg grams per kilogram

grams per cubic meter

g/m 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

parts per million (by volume)

ppm

ppmW parts per million (by weight) PRT Platinum resistance thermometer (typically type Pt 100) psig pound(s) per square inch (gauge) psia pound(s) per square inch (absolute) RH relative humidity RTU Remote Terminal Unit scfh standard cubic feet per hour SD storage device card (memory card for storing datalog ﬁ les) temp temperature USB Universal Serial Bus V Volts

S8000 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.

x 97488 Issue 4, August 2018

S8000 User’s Manual

1 INTRODUCTION

The S8000 is a high precision instrument used for the measurement of dew point in air and other gases. Relative humidity, moisture content, and other calculated parameters based on dew point, pressure and temperature of the sample gas can also be displayed.

The S8000 is capable of measuring dew points as low as -60°C (-76°F); it can measure dew points up to (but not including) the point of condensation (maximum +40°C (+104 °F)).

Two models of the S8000 instrument are available:

• Low Pressure (1 barg (14.5 psig) max)

• High Pressure (20 barg (290 psig) max)

INTRODUCTION

Figure 1

S8000

Michell Instruments 1

INTRODUCTION

1.1 Operating Principle

The system operates on the chilled mirror principle, whereby a gas sample is passed into the sensor housing and ﬂ ows over the surface of the chilled mirror contained within. At a temperature dependent upon the moisture content in the gas, and the operating pressure, the moisture in the gas condenses out on the surface of the mirror.

An optical system is used to detect the point at which this occurs, and this information is used to control the mirror temperature and maintain a constant thickness of the condensation layer on the mirror surface.

A beam of light from an LED (1) is focused on the mirror surface (2) with a ﬁ xed intensity. As the mirror is cooled, less light is reﬂ ected due to the scattering effect of the condensate formed on the mirror surface. The levels of reﬂ ected and scattered light are measured by two photo-detectors (3 & 4) and compared against a third reference detector (5) measuring the intensity of light from the LED.

The signals from this optics system are used to precisely control the drive to a solid state thermoelectric cooler (TEC) (6), which heats or cools the mirror surface. The mirror surface is then controlled in an equilibrium state whereby evaporation and condensation are occurring at the same rate. In this condition, the temperature of the mirror, measured by a platinum resistance thermometer (7), is equal to the dew-point temperature of the gas.

S8000 User’s Manual

Figure 2

Operating Principle

2 97488 Issue 4, August 2018

S8000 User’s Manual

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

INSTALLATION

personnel.

Figure 3

Open the box (5) and unpack carefully as follows (see

1. Remove the accessories box (4).

2. Lift out the instrument (2) together with its end packing pieces (1) and (3).

3. Remove the end packing pieces (1) and (3) set the instrument down at the site of installation.

4. Save all the packing materials for the purpose of returning the instrument for re-calibration or any warranty claims.

S8000 Packing

Figure 3)

Michell Instruments 3

INSTALLATION

S8000 User’s Manual

The accessories box should contain the following items

1. Traceable calibration certiﬁ cate

2. User's manual

3. IEC power cable

4. SD memory storage card

5. Optics cleaning kit

6. Allen Key SMM

7. USB communications cable

8. Pt100 temperature probe (optional)

9. CAT5 ethernet cable (optional)

10. Microscope (optional)

If there are any shortages, please notify Michell Instruments immediately (see www.michell.com for contact information).

4 97488 Issue 4, August 2018

S8000 User’s Manual

2.3 Operating Requirements

2.3.1 Environmental Requirements

The S8000 instrument should either be placed on a ﬁ rm and level surface in a laboratory environment, or mounted into a standard 19" rack. Recommended ambient temperature +20 to +25°C (+68 to +77°F) although the instrument will operate, within speciﬁ cation, at elevated ambient temperatures of up to +40°C (+104°F), providing the cooling vents are kept clear and unrestricted. It is essential however that this upper

temperature limit (+40°C (+104°F)) is not exceeded.

A free ﬂ ow of air around the instrument is required at all times.

The instrument is suitable for mounting in a standard 19" rack.

INSTALLATION

For rack mounted instruments, forced air cooling of the

rack should be considered if operating at high ambient

2.3.2 Electrical Requirements

All versions of the instrument require the following electrical supply:

• 85 to 264 V AC, 47/63 Hz, 100 VA max

• Alarm outputs for all instrument types comprise two sets of changeover relay contacts, one set for a

INSTRUMENT FAULT. Both sets of contacts are rated at 24 V, 1 A. NOTE:

THIS RATING MUST NOT BE EXCEEDED.

2.4 Exterior Layout

temperatures.

PROCESS alarm and one set for an

The controls and indicators relating to the operator interface are located on the front panel.

The external PRT connection, mains power IEC socket, analog output connector, remote temperature probe connector, alarm relay connector, the USB socket, and the Ethernet socket (optional) are located on the rear panel.

Figures 5 and 6

and vertical versions of the instrument. Tables 1 and 2 detail the controls and indicators and the function key operations.

show the layout of these controls for both the rack mount/horizontal

Michell Instruments 5

INSTALLATION

Front Panel

S8000 User’s Manual

Figure 4

Item Name Description

Microscope

Blanking Plug

2 Sensor Housing

Touch Screen

Display

Table 1 Front Panel Controls and Indicators

Used to cover the microscope port when not in use. Also to be used as a key to remove optics window (see Section

5.3).

Exterior housing of the sensor. See Section 5.3 for information about the sensor head.

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.

Front Panel

6 97488 Issue 4, August 2018

S8000 User’s Manual

Rear Panel

INSTALLATION

7455

8 77 56

59 10512514513

Figure 5

Item Name Description

Usually slightly above atmospheric pressure in order to

4 Gas Input Port

maintain ﬂ ow rate over the mirror, but can be up to a maximum of 20 barg depending upon application.

Rear Panel

711

5 Gas Output Port Usually vented to atmosphere.

Three, 2-wire output channels, CH1, CH2 and CH3, each of which may be conﬁ gured to give either a 0-20 mA or a 4-20 mA current loop output or a 0 to 1 V voltage signal

Analog Output

Connector

Remote

Temperature Probe (optional)

8 Alarms

USB

Communications Port

representing any one of the measured or calculated output parameters selected.

Spans for each signal output are separately conﬁ gurable. Refer to Section 2.5.2.

6-Pin Lemo socket for connection of remote Pt100 temperature probe.

Process and Fault alarm outputs. Each alarm has one set of potential free, changeover, relay contacts, common (COM), normally closed (N/C) and normally open (N/O).

The Process alarm can be conﬁ gured to operate at a speciﬁ ed level on any of the measured or calculated parameters. Refer to Section 2.5.3.

Used for connection to an external computer system for running application software (optional).

Michell Instruments 7

INSTALLATION

DANGER

Electric

Shock Risk

RJ45 Ethernet

Socket (Optional)

4-wire PRT bridge output (Optional)

S8000 User’s Manual

Used for communication with the instrument over a network connection. See Section 4.2.3 for details on how to conﬁ gure the network settings. See Section 4 for information on using and installing the application software.

Banana sockets for external 4-wire measurement of the internal PRT. Active only when PRT set to External from Display options, and instrument is in the MEASURE phase. In this mode the dew-point display is set to read zero, DCC is set to OFF and manual DCC is also disabled.

Flow Control Valve (Optional)

Pump Input Port (Optional)

Pump Output Port (Optional)

Table 2 Rear Panel Controls and Indicators

Used to regulate ﬂ ow through the sensor when pump is in use.

Can be linked to Gas Output port with supplied tubing for operation with sample pump - NOT TO BE USED ABOVE

ATMOSPHERIC PRESSURE.

Vented to atmosphere when pump is in use.

2.5 Rear Panel Connections (All Versions)

These tasks should be undertaken only by competent

personnel.

All the connections to the rear panel are electrical

connections.

Exercise due caution, particularly when connecting to

external alarm circuits which could be at high potential.

Connections to the rear panel of the instrument are explained in the following sections.

8 97488 Issue 4, August 2018

S8000 User’s Manual

2.5.1 Power Supply Input

INSTALLATION

The AC power supply is a push ﬁ t into the power input socket as shown in method of connection is as follows:

Figure 7

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 is switched to

ON/OFF switch (1) on the power supply connector

OFF.

. The

3. Push the IEC connector (3) ﬁ rmly 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. The instrument may then be switched on, as

required, using the

ON/OFF switch.

Figure 6

Power Supply Input

Michell Instruments 9

INSTALLATION

2.5.2 Analog Output Connections

The three analog outputs can be conﬁ gured to represent any of the directly measured or calculated output parameters. They are provided as 2-wire signals from a 6-way connector located on the rear panel of the instrument

Each of these outputs 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 conﬁ guration of these outputs, i.e. parameter represented, output type (current loop or voltage) and upper/lower span

levels are set up via the

SETUP Menu Screen (refer to Section 3.2.4).

S8000 User’s Manual

These signals may be used to control external systems. During a

HOLD period following a DCC cycle, they are held at the level that they were at

the immediately prior to the start of the cycle. When the dew-point measurement is stable,

or if the maximum selected parameter throughout the measurement cycle.

The default settings of these analog outputs are:

HOLD period has expired, they are released and will track the

DCC cycle, and for

Channel 1: 4-20 mA, dew point, -60 to +20°C Channel 2: 4-20 mA, ppm

, 0 to 3000

Channel 3: 4-20 mA, ﬂ ow, 0 to 1000ml

NOTE: The analog outputs are only active during the will, therefore, be off after switch-on and remain off until the system enters

MEASURE phase.

the

The three analog output ports connections are made via a single, 6-way, push ﬁ t connector block as shown in 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 signals referenced to a

MEASURE phase. They

Figure 7

Analog Output Connectors

10 97488 Issue 4, August 2018

S8000 User’s Manual

For each output:

1. Remove the terminal block ﬁ tted into the analog output socket.

INSTALLATION

2. Strip back the wire for the common (black) connection to the exposing approximately 6mm (0.25"). Insert the wire into the

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 exposing approximately 6mm (0.25"). Insert the wire into the

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 for the

5. Locate the terminal block over the connector labelled

OUTPUTS and push the terminal block ﬁ rmly into the connector.

2.5.3 Alarm Output Connections

Two alarm outputs are provided from a terminal block (Item 9, 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.

OP2 and OP3 outputs.

CH1 output,

OP1 output,

ANALOGUE

Figure 6),

COM1

OP1

located on the

Under the 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 monitor the dew-point parameter.

The 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 ﬁ lm 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 display.

The two alarm output ports are connected to the instrument via a single 6-way, push-ﬁ t connector block as shown in free, change-over relay contacts.

Each contact set is labelled

SETUP menu, (refer to Section 3.2.4), the PROCESS alarm can be conﬁ gured to

PROCESS alarm is set to

FAU LT alarm is a non-conﬁ gurable alarm which continuously monitors the degree

Figure 9

. Each output comprises a 3-wire set of potential

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 be used for each of the

N/C lines.

and

COM (common) lines and a separate color for each of the N/O

Michell Instruments 11

INSTALLATION

DANGER

Electric

Shock Risk

S8000 User’s Manual

WARNING: Alarm leads MUST be potential free when wiring

to connector block.

Figure 8

For each output:

1. Strip back the wire for the common (black) connection to the connector way for the 6mm (0.25") wire and clamp into the screw block

not overtighten the screw.

2. Strip back the wire for the connector way for the 6mm (0.25") wire and clamp into the screw block N/O terminal way. Do

not overtighten the screw.

3. Strip back the wire for the connector way for the 6mm (0.25") wire and clamp into the screw block

not overtighten the screw.

4. Repeat operations 1 to 3 for the appropriate colored wires.

FAU LT alarm contact set, exposing approximately

Alarm Output Connectors

COM terminal way. Do

N/O (e.g. green) connection to the N/O

N/C (e.g. blue) connection to the N/C

N/C terminal way. Do

PROCESS alarm contact set, using

COM

5. Locate the terminal block over the connector labelled the terminal block ﬁ rmly into the connector.

ALARMS and push

12 97488 Issue 4, August 2018

S8000 User’s Manual

2.5.4 Remote PRT Probe (Optional)

1. Rotate the body of the PRT probe connector until it locates in the socket labelled

2. Push the connector into the socket until it locks. Do not attempt to

force it into the socket. If it will not ﬁ t in, rotate it until the key locks and it pushes in easily.

3. To remove the connector, slide the connector’s body collar (1) back along its axis, away from the instrument to release the lock and then gently pull the connector body out of the socket. Do not attempt to pull it out

with the cable - make sure that the collar is ﬁ rst released.

REMOTE TEMPERATURE (see

INSTALLATION

Figure 10).

Figure 9

Remote PRT Connection

Michell Instruments 13

INSTALLATION

2.5.5 4-Wire PRT Output (Optional)

These four terminal binding posts (Item 1,

Figure 11),

external monitoring purposes.

Two pairs of lines are provided, two drive and two sense lines. One black (low) and one red (high) for the drive lines, and one black (low) and one red (high) for the sense lines.

Connections to these terminal posts can be made either via 4mm plugs pushed into the ends of the terminal posts or, alternatively, as shown, wires (5) connected round the posts and clamped down by screw action.

are provided for calibration and

S8000 User’s Manual

To set-up the system for Section 3.2.10.

2.5.6 USB Communications Port Connector

PRT output refer to

Figure 10

The instrument features a USB port for communication with the Application Software. The appropriate cable will be supplied with the instrument.

1. Check the orientation of the connector and gently push it into the socket

labelled

2. To remove the connector, pull it out of the socket by holding the connector body. Do not attempt to remove it from the socket by pulling on the cable.

USB (see

Figure 12)

Internal PRT Output (Optional)

For more information on how to conﬁ gure the Application Software go to Section 4.

Figure 11

USB Port Connection

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S8000 User’s Manual

2.5.7 Ethernet Port (Optional)

The instrument features an optional RJ45 port for communication with the Application Software.

1. Check the orientation of the connector and gently push it into the socket labelled

LAN.

INSTALLATION

Figure 12

2. To remove the connector, depress the small locking tab on the top and pull it out of the socket by holding the connector body.

For more information on how to conﬁ gure the Application Software go to Section 4.

2.5.8 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.

1. Check the orientation of the connector and gently push it into the socket labelled

RS232 or RS485, and tighten the retaining screws.

Ethernet Port (Optional)

Figure 13

2. Loosen the retaining screws, and pull the connector out of the socket by holding the connector body.

RS232/485 Port (Optional)

Michell Instruments 15

INSTALLATION

RS232

Pin 1 N/C Pin 2 TXD Pin 3 RXD Pin 4 N/C Pin 5 GND Pin 6 N/C Pin 7 N/C Pin 8 N/C Pin 9 N/C

RS485

Pin 1 N/C Pin 2 N/C Pin 3 A Pin 4 N/C Pin 5 GND Pin 6 N/C Pin 7 N/C Pin 8 B Pin 9 N/C

S8000 User’s Manual

RS232 Pinout (9-pin female)

Pin 1

Pin 6

RS485 Pinout (9-pin female)

Pin 1

Pin 6

Pin 5

Pin 9

Pin 5

Pin 9

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S8000 User’s Manual

2.5.9 Connection of Gas Supplies

POSSIBLE INJURY! The tubing, valves and other apparatus

attached to this instrument must be adequate for the

maximum pressure which will be applied, otherwise physical

injury to the operator or bystander is possible.

Before connection or disconnection of the instrument to

and from the gas line it is essential to vent the system to

atmospheric pressure, otherwise severe injury could result.

Sample gas connections are made via the GAS OUT port (7) and the GAS IN port (8) located on the rear panel.

INSTALLATION

653

Figure 14

Michell Instruments 17

Gas Connections

4 1, 2

INSTALLATION

The sample inlet and outlet connections are either 6mm or ¼" Swagelok® tube couplings (optional). The gas input connection must be made with 6mm or ¼" stainless steel tubing (the appropriate size for the connectors ﬁ tted). The gas output connection for most applications can just be exhausted to atmosphere via 300mm (11.8") of PTFE tubing (1).

S8000 User’s Manual

The method of connection to the

1. Cut appropriate diameter stainless steel tubing (2) to the correct length and, if necessary, bend to shape to suit the location of the instrument.

NOTE: To facilitate ease of connection to the port, at least 75mm (3") of the tubing coming out of the

2. Clean off any burrs or metal shavings adhering to the tubing.

3. Pass the tubing (2) through the Swagelok nut (3).

4. Fit the back ferrule (4) over the tubing (2) with the bevelled end facing the back of the front ferrule (5).

5. Place the front ferrule (5) over the tubing (2), bevelled end towards the adaptor (6).

6. Push the tubing as far as it will go into the ﬁ tting and tighten up the locking nut (3) ﬁ nger tight.

7. Hold the adaptor (6) ﬂ ats with a wrench and tighten up the locking nut (3) 1¼ turns. This action compresses the front ferrule (5) and back ferrule (4) onto the tubing to form a gas tight seal. CAUTION: Do not

overtighten as this could cause the ferrules to crack and destroy the integrity of the seal.

GAS IN port (8) is as follows.

GAS IN port should be straight.

8. Connect up the in operations 1 - 8 above optionally using PTFE tubing (1) in place of stainless steel (2).

GAS OUT port (7) in a similar manner to that described

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2.6 Internal Sample Pump (Optional)

The internal sample pump can be used to allow measurement of static samples at atmospheric pressure. The pump can be be routed in to the sample loop or bypassed, depending on whether it is connected via the external tube link.

The instrument can be conﬁ gured for operation with a pressurized sample by following the instructions in Section 2.6.

To conﬁ gure the instrument for sample pump operation (Atmospheric input pressure only):

INSTALLATION

1. Connect the external tube link from the port, and tighten to form a gas-tight seal

2. Connect the sample line to the

3. Use the needle valve on the pump panel to control the ﬂ ow rate to 500ml/ min, as indicated on the display

GAS IN port

GAS OUT port, to the PUMP IN

Figure 15

Gas Connections when Pump is Fitted

Michell Instruments 19

INSTALLATION

2.7 Conversion of S8000 to Rack Mount

S8000 User’s Manual

Figure 17

rack. To ﬁ t the unit proceed as follows:

illustrates the method for ﬁ tting a rack mount instrument into a standard 19”

Figure 16

1. Turn the unit on its left hand end and remove the four screws and washers from the side panel.

2. Line up the ﬁ xing holes on the right hand side of the instrument with the corresponding holes in the right hand wing (ﬂ ange facing outwards).

3. Insert the four screws and washers through the wing and tighten ﬁ nger tight.

4. Ensure that the front ﬂ ange 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 from the rack wings follow these directions above, in reverse.

Rack Fixing Method

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S8000 User’s Manual

3 OPERATION

As supplied, the S8000 is ready for operation and a set of default parameters has been installed. This section describes both the general operation of the instrument and the method of setting it up and changing the default parameters (see Appendix E) - should this become necessary.

3.1 General Operational Information

While the instrument can physically operate in a ﬂ owing gas stream of between 0.3 and 1 Nl/min, (0.6 and 2.1 scfh), Michell Instruments recommends operating at 0.5 Nl/min (1.06 scfh) which is the ﬂ ow-rate used during calibration. Operating at an alternative rate could impact the instrument’s response time.

OPERATION

For all applications, the sample gas is taken into the instrument via the located on the rear panel, from where it passes into a sample chamber. The gas ﬂ ow rate is then measured on the exhaust side of the sample chamber, prior to being exhausted

from the instrument via the

Within the sample chamber, the gas is passed over a Peltier chilled, gold-plated mirror. The instrument’s internal control system maintains the drive to the Peltier heat pump to ensure, by controlling the mirror temperature, that a level of condensate is maintained on the mirror surface. The temperature of the mirror is then measured as the dew point.

After passing over the mirror, the sample gas is then typically exhausted to atmosphere via the

The sampling chamber is available in two different conﬁ gurations; low pressure and high pressure. The low pressure version is designed to operate up to 1 barg (14.5 psig) max and the high pressure version up to 20 barg (290 psig) max. When operating in high pressure applications, a relevant gas sample line, representative of the product, would be taken and fed into the instrument. In these applications, a metering valve can be installed after the output port to maintain ﬂ ow rate to within the instruments operational limits.

When the sample to be measured is at atmospheric pressure, the [optional] sample pump can be used to draw it through the instrument. Using the tube link provided,

the adjusted using the integrated metering valve. The

outlet.

GAS OUT port.

GAS OUT port can be connected to the PUMP IN port. The ﬂ ow rate can then be

GAS OUT port.

PUMP OUT port then becomes the

GAS IN port

The S8000 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 ﬁ ber optic manufacturing applications.

Michell Instruments 21

OPERATION

MIN

OOL

SETU

.95

5.01

498

3.2 Instrument Display

The S8000 features a 5.7” color touch screen display.

S8000 User’s Manual

When the instrument is switched on an menu system loads.

Initialising overlay will be shown while the

Figure 17

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

Dew Point

-34

Temperature

Flow Rate

DCC ON

MAXC

Initialising Overlay Screen

79.

°C

80.5

°C

DP 0.00 Mode Hold

Next Mode 03:28:17 Process ON Fault OFF

ml/min

Sensor Control

TANDBY

Figure 18

Main Screen

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3.2.1 Main Screen

OPERATION

5 6 7 8

DCC OFF /

DCC ON

READOUTS

FLOW RATE

MAXCOOL /

Figure 19

MEASURE

Main Screen Layout

STANDBY /

OPERATE

STABILITY

GRAPH

OPERATIONAL

STATUS DISPLAY

No Name Description

Readouts

(Customizable)

These readouts display measured instrument parameters. See Section 3.2.2 for additional information.

2 Flow Readout Displays ﬂ ow rate in chosen units.

3 Stability Graph

Operational Status

Display

Displays a plot of the dew point over time. Touch the readout once to enter full screen mode.

A detailed description of each item displayed in this area is in Section 3.2.3.

Initiate a DCC cycle. See Section 3.4.1 for a detailed

DCC Button

explanation of the DCC function. See Section 3.2.6 for DCC setup parameters.

MAXCOOL Button

STANDBY Button

Toggle explanation of the

Switch between When switching to

initiated.

MAXCOOL mode. See Section 3.4.2 for a detailed

MAXCOOL function.

MEASURE and STANDBY mode.

MEASURE mode a DCC cycle will be

See Section 3.4.6 for a detailed explanation of mode.

Access to the Setup Menu.

SETUP Button

See Section 3.2.4 for more information about the setup menu system.

SET UP

STANDBY

Table 3 Main Screen Description

Michell Instruments 23

OPERATION

3.2.2 Customizable Readouts

The three readouts on the Main Screen can be conﬁ gured by the user to show any of the following parameters:

• Dew point

• Temperature

• Temperature – Dew point

• Relative Humidity, %RH

• Water Content (ppm

• Pressure *

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

; ppmW; g/Kg; g/m3)

S8000 User’s Manual

The parameters displayed by default are Dew point, ppm

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 conﬁ rm selection

Full Screen Mode

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

3.2.3 Operational Status Display

The Operational Status display includes the following:

Indicates data logging is enabled. Refer to Sections 3.2.7 and 3.4.4.

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

Mode

Next Mode

Process

Fault

Sensor

Reports current operational mode. This will either be

Shows the time (in Hours:Minutes:Seconds) remaining until the transition to the next mode of operation.

This two-state, alarm is either

The process alarm can be set on any parameter (refer to Section 2.5.3). Used to monitor the optical system and the degree of mirror contamination

During normal operation, with no fault conditions, this will read OFF. It will be set to

measurement or if the mirror contamination exceeds 100% of the ﬁ lm thickness.

Indicates the operational mode of the sensor. This can be either

ON if there is either a fault with the optics or dp temperature

and g/m3.

MEASURE, STANDBY, DCC, HOLD or MAXCOOL.

ON/OFF notiﬁ cation indicates whether a parameter process

ON or OFF.

CONTROL, HEATING or COOLING.

Table 4 Operational Status Display

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3.2.4 Setup Menu Screen

The Setup Menu is used to adjust the operational parameters of the instrument, change the display setup and start or stop the data logging feature.

Initially, when the Setup Menu Screen is opened a set of labelled icons is displayed. Touching one of these icons will take you to the appropriate submenu.

OPERATION

Figure 20

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 predeﬁ ned 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 25

OPERATION

Numeric Input

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

S8000 User’s Manual

789

Figure 21

2 3

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

•

Leaving Menus

26 97488 Issue 4, August 2018

Clear Input

Cancel input

Save input

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

S8000 User’s Manual

3.2.5 Menu Structure

OPERATION

MAIN SCREEN

DCC

Display Hold

Period

Reset Optics

Setpoint Interval

Output Hold

LOGGING

Status

Filename

Interval

OUTPUT

Output Select

Output Type

Parameter

Minimum

Maximum

ALARM

Parameter

Setpoint

Figure 22

DISPLAY

Resolution Primary Unit Pressure Unit

Stability

FAST

PRT Mode

Language

Backlight

Menu Structure

CLOCK ABOUT HELP

Date

Time

Network Settings

IP Address

Subnet Mask

Default Gateway

Press to return to

Press for more

Main Screen

information

Michell Instruments 27

OPERATION

3.2.6 DCC

S8000 User’s Manual

Figure 23

Parameter Description

Display Hold

Period

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

Set point

Interval

Output Hold

Holds the values on the display while the instrument is in 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 ﬁ nishing a DCC cycle. Available Input: 1 to 59 minutes

Table 5 DCC Parameters

DCC Screen

HOLD mode.

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3.2.7 LOGGING

OPERATION

Figure 24

Parameter Description

Status Displays the status of the current logging operation. Filename Displays the ﬁ lename of the current log ﬁ le.

Interval

SD Card Icon Shows the SD card status - refer to Table 7. START/STOP

Button

Time in seconds between recording readings in the log ﬁ le. Available Input: 5 to 600 seconds

Automatically generates a new ﬁ le name based on current time and date - Starts logging at speciﬁ ed interval.

Table 6 Logging Parameters

Logging Screen

Michell Instruments 29

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 User’s Manual

Icon Description

SD Card not ﬁ tted

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

SD Card is currently being written to

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

Hardware error

Contact Michell Instruments' service department

Table 7 SD Card Status Indicators

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3.2.8 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/m

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 8 Outputs Parameters

% RH

Figure 25

100

Outputs Screen

, g/Kg, T-DP, DP, %RH, ppmV, ppmW, T, psig,

3.2.9 ALARM

Parameter Description

Parameter

Set point

Figure 26

Alarm Screen

The parameter used to control the process alarm. Available Input: g/m

, g/Kg, T-DP, DP, %RH, ppmV, ppmW, T, psig,

barg, kPa, MPa, ml/min Set point that triggers the alarm relay to activate.

Available Input: Dependent on parameter

Table 9 Alarm Parameters

Michell Instruments 31

OPERATION

3.2.10 DISPLAY

S8000 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 3.4.5. Available Input: OFF / ON

If required for the calibration process or for external monitoring, the internal PRT (optional) 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 / German / Spanish / French / Italian / Portuguese / American / Russian / Chinese / Japanese

The brightness of the backlight. Available Input: 5 to 100%

Figure 27

Display Screen

Table 10 Display Parameters

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3.2.11 CLOCK

OPERATION

Parameter Description

Date Current date. Time Current time.

3.2.12 ABOUT (Network Settings)

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

Figure 28

Clock Screen

Table 11 Clock Parameters

192

168

255

Figure 29

255

168192

255

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 12 Network Parameters

Michell Instruments 33

OPERATION

3.3 Operational Functions

3.3.1 Operating Cycle

S8000 User’s Manual

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

31.

Figure 30

At initial switch-on, the instrument enters a DCC cycle for 2 minutes. This heats the mirror to a default temperature of +20°C (+36°F) above the previously measured value

- at the time of switch on this will be ambient temperature. This ensures that all moisture is driven off the surface of the mirror.

Typical Operating Cycle

Figure

The mirror is maintained at this temperature for the DCC duration (default 2 minutes) or 2 minutes on switch-on. During the DCC process, Data Hold ﬁ xes 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 ﬁ nished, the measurement ( 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 Status area of the display will indicate

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, the analog outputs will resume their normal operation. At this point the the display will change to

MEASURE.

MEASURE) period commences,

CONTROL.

HOLD will release, and

STATUS area of

34 97488 Issue 4, August 2018

S8000 User’s Manual

3.4 Operating Guide

3.4.1 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.

OPERATION

During the the dew point to remove the condensation which has formed during measurement. The surface ﬁ nish of this mirror, with the contamination which remains, is used by the optics as a reference point for further measurements. This ensures the accuracy of the instrument is unaffected by any loss of reﬂ ectivity due to wear or contamination of the mirror.

After switch-on, the mirror is assumed to be clean, therefore the instrument will only run a every subsequent

hours.

At certain times it may be desirable to disable the from interrupting a measurement cycle, e.g. during a calibration run. However, the DCC functionality is important to the continued accuracy and stability of the instrument and should not be permanently disabled.

A manual Screen. The DCC button is context sensitive, i.e. if

DCC process the mirror is heated to a default temperature of 20°C above

DCC for 2 minutes to quickly establish a clean mirror reference point. By default,

DCC is 4 minutes in duration and will automatically occur every 4

DCC function in order to prevent it

DCC can be initiated or cancelled by touching the DCC button on the Main

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 Screen, refer to Section 3.2.6.

DCC cycle on the DCC Setup

Michell Instruments 35

OPERATION

3.4.2 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:

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

• 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 mirror temperature low enough to reach the dew point.

S8000 User’s Manual

• whether the instrument is controlling by switching short period and then switching back to mirror temperature brieﬂ y and when it is switched back to

control loop should be able to stabilize the mirror temperature at the dew point again.

MAXCOOL function can be turned on by touching the MAXCOOL button on the

The Main Screen.

3.4.3 Pressure Compensation

As an option, the S8000 instrument can be ﬁ tted 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 compensation for all of the pressure related parameters, ppmV, ppmW, g/m3 and g/Kg. If a pressure transducer is not ﬁ tted 101.3 kPa is used as the basis of all these calculations. The internal pressure transducer is ranged 0 to 25 bara (0 to 363 psia).

3.4.4 Data Logging

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

MAXCOOL on for a

MEASURE. This will depress the

MEASURE the

Log ﬁ les 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 3.2.7.

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3.4.5 Frost Assurance System Technology (FAST)

Theoretically, it is possible for water to exist as a super-cooled liquid at temperatures down to -40°C (-40°F).

A gas in equilibrium with ice is capable of supporting a greater quantity of water vapor at a given temperature than a gas in equilibrium with liquid water. This means that a measurement below 0°C taken over water will read approximately 10% lower than the same measurement taken over ice.

OPERATION

When turned on and 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 disable the

3.4.6 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.

STANDBY mode, drive to the Peltier heat pump is removed. While STANDBY mode

In 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 ﬂ ow rates are being adjusted and the analog outputs are being conﬁ gured.

FAST function, refer to Section 3.2.10.

FAST is enabled, the S8000 makes an initial dew point measurement.

FAST function can be switched on and off. To enable or

Michell Instruments 37

APPLICATION SOFTWARE

4 APPLICATION SOFTWARE

The S8000 features Modbus over USB, RS232/485 or Ethernet, depending on which option was ordered. A copy of the application software is supplied on a CD with the instrument.

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 ﬁ le to a suitable location.

2. Close all currently running Windows programs.

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

S8000 User’s Manual

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

5. Restart the PC to complete the installation.

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, depending on whether it is ﬁ tted with a USB, RS232/485 or Ethernet module.

7316-MIL1-8000.

Figure 31

Communications Setup Screen

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4.2.1 USB Communication

1. Connect the S8000 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 33)

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 ﬁ nd the correct COM port automatically.

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

APPLICATION SOFTWARE

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

Figure 32

Windows Device Manager Screen

Michell Instruments 39

APPLICATION SOFTWARE

4.2.2 RS232/485 Communication

1. Connect the instrument to the PC using the supplied RS232/485 cable.

2. If an RS232/485 port is present locally on the PC, then its COM port can be identiﬁ ed using Windows Device Manager. If an RS232/485 to USB converter is being used, then it will be assigned its own COM port.

S8000 User’s Manual

3. Launch the application software and choose

4. Choose the appropriate COM port from the drop down list, as shown in the Windows Device Manager Screen.

5. Click the

4.2.3 Ethernet Communication

1. Conﬁ gure the network settings of the instrument. Refer to Section 3.2.12.

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

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

4. Click the

5. Click the then proceed to the next screen by clicking the

check network settings and try again.

OK button to proceed to the next screen.

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

Test button. If communication with the instrument is successful

manual.

OK button, otherwise

Figure 33

Network Settings Screen

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S8000 User’s Manual

4.3 Data Acquisition or Edit Variables Mode

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

APPLICATION SOFTWARE

Figure 34

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 User’s Manual

Figure 35

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 ﬁ le updates

Log ﬁ lename

DCC

MAXCOOL

Begin data acquisition and logging A ﬁ lename must be ﬁ rst be selected to enable data logging

Path and ﬁ lename of the log ﬁ le Click the small folder icon next to this text box to create a new log ﬁ le

Initiate a DCC cycle Refer to Section 3.4.1 for detailed information on the DCC function

Toggle between MAXCOOL and MEASURE mode Refer to Section 3.4.2 for detailed information on the

function

MAXCOOL

Toggles between STANDBY and MEASURE mode

STANDBY

Table 13 Data Acquisition Control Description

Refer to Section 3.4.6 for detailed information on the STANDBY function

42 97488 Issue 4, August 2018

S8000 User’s Manual

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 ﬁ le

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

APPLICATION SOFTWARE

Table 14 Graph Control Description

Graph

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

Status Bar

Name Description

Acquisition state

Number of readings

Next reading countdown

Log ﬁ le Full path of the log ﬁ le (if speciﬁ ed)

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 15 Status Bar Description

Michell Instruments 43

APPLICATION SOFTWARE

4.3.2 Variable Edit

The variable edit mode allows the instrument conﬁ guration 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, ﬁ rst click on it to highlight it.

If the variable has a ﬁ xed list of options, a drop-down arrow will appear in the right- hand column. Choose a new value from the drop-down list provided.

If the variable does not have a ﬁ xed list of options, type the new value into the right- hand column text input area.

S8000 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 modiﬁ ed value has been written to the instrument, the background colour will return to white.

44 97488 Issue 4, August 2018

S8000 User’s Manual

APPLICATION SOFTWARE

Figure 36

Variables Editor Screen

Michell Instruments 45

MAINTENANCE

DANGER

Electric

Shock Risk

5 MAINTENANCE

There are no user-serviceable parts on the S8000, other than the removal and replacement of the AC power supply fuse and cleaning the mirror in the sensor.

5.1 Safety

S8000 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.

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S8000 User’s Manual

5.2 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 ﬁ tted with a fused plug, switch off the power supply, remove the plug, check and, if necessary, replace the fuse. If the instrument still fails to operate, after ﬁ tting the fuse and switching the power supply on, proceed as follows (see

74 75

Figure 38)

MAINTENANCE

Figure 37

2. Switch the instrument’s ON/OFF switch (1) to OFF, isolate the external power supply and remove the IEC power connector (2) from the instrument’s power socket (3). NOTE: If access to the rear of the

instrument is restricted, e.g. if the instrument is a rack mounted model, it may be necessary to remove the instrument from the rack (refer to Section 2.77).

3. Locate the fuse carrier (4) and pull it out of the connector housing (5). A small screwdriver inserted under the lip may be useful in order to lever it out.

4. Replace the fuse cartridge (6). NOTE: It is essential that a fuse of

the correct type and rating is ﬁ tted to the instrument (20mm, T-type (2.5 A anti-surge).

5. Fit a new fuse cartridge (6) into the fuse carrier (4) and push the fuse carrier (4) back into the power connector housing (5).

6. Push the IEC power connector (2) back into the power socket (3), turn on the external power supply and switch on the instrument (1). 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.

Power Supply Fuse Replacement

Michell Instruments 47

MAINTENANCE

5.3 Sensor Mirror Cleaning

Before removing the safety strap or opening the sensor

housing it is essential to vent the system to atmospheric

pressure, otherwise severe injury or damage to the

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 User’s Manual

WARNING

equipment could result.

Figure 38

The cleaning procedure is as follows:

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

2. Remove unscrew the large stainless steel cover (2).

3. Carefully remove the optics block (3) to reveal the mirror window (4).

Sensor Mirror Cleaning

4. Insert the blanking plug (1) into the mirror window (4) to remove it.

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S8000 User’s Manual

5. 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 ﬁ rmly on the cotton bud/Q-Tip when cleaning. Allow enough time for the cleaning solvent to fully evaporate before reassembly.

6. Replace the items in the reverse order. Make sure when reﬁ tting the optics block to align the gold contacts on the block with the gold contacts on the instrument.

7. Replace the large stainless steel cover, screwing it in ﬁ rmly but taking care not to overtighten it.

5.3.1 Releasing optics window

If the optics window is too tight to unscrew by hand (with the blanking plug) then use the Allen key supplied to loosen.

MAINTENANCE

Figure 39

Michell Instruments 49

Never use the Allen key to tighten the optics window as

this may result in permanent damage to the instrument.

Releasing Optics Window

WARNING

MAINTENANCE

5.3.2 Fitting the Microscope (Optional)

To observe the frost formation on the chilled mirror surface, an optional microscope (Part No. S8K-RS-MCI) can be provided. The microscope allows direct viewing of the mirror surface, providing assurance that ice crystals have formed and that supercooled water is not present at temperatures below 0°C.

When the instrument is controlling at a dew point, condensation is seen as small, bright red specks against a dark background. Liquid water is seen as rounded droplets and ice as sharp edged crystals.

1. Remove the blanking plug and screw the microscope unit into the sensor cap until about 6 threads remain showing.

S8000 User’s Manual

Figure 40

2. If the instrument is not operating, switch it ON and rotate the microscope body until the mirror surface is brought into sharp focus. Two or three extra turns either way are usually sufﬁ cient.

3. To prevent stray light effects, always replace the blanking plug after removing the microscope.

Fitting the Microscope

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S8000 User’s Manual

6 GOOD MEASUREMENT PRACTICE

The S8000 is designed to operate in a ﬂ owing gas stream. The sampling chamber, which enables a small sample of gas to be passed over a Peltier chilled, plated copper mirror, is designed to operate at pressures up to 1 barg (14.5 psig) (low pressure version), and up to 20 barg (290 psig) max (high pressure version). For many applications, or when the internal sample pump is in use, the sample chamber operates at atmospheric pressure with the sample gas being exhausted to atmosphere.

The sensor is designed for operation with ﬂ ow rates of 0.3 and 1 Nl/min (0.6 and 2.1 scfh), although it will operate successfully at ﬂ ow rates as low as 0.1 Nl/min (0.2 scfh). It is important to ensure that the ﬂ ow rate through the sample line, connecting the source to the S8000, is high enough to avoid log time lags in response to humidity changes at the sample source.

Ideally therefore, the ﬂ ow rate should be set between 0.3 and 0.7 Nl/min (0.6 and

2.1 scfh), 0.5 Nl/min (1.06 scfh) [±0.2 Nl/min (±0.4 scfh) being the recommended

optimum]. For ﬂ ow regulation purposes, by default, the

FLOW. Should the FRONT page not be showing FLOW, Section 3.2.2 details the

read method of setting-up the instrument to display this parameter.

GOOD MEASUREMENT PRACTICE

FRONT page is conﬁ gured to

Unless the optional sample pump is ﬁ tted, ﬂ ow regulation is not provided within the S8000 instrument. Gas ﬂ ow must therefore be regulated outside the instrument, typically on the needle valve. Always use high quality valve gear, coupling connections and pipework.

Avoid pressure gradients in the system by placing excessive ﬂ ow restriction on the

side of the system. In applications where the test gas has a very high ﬂ ow rate,

OUT

an instrument by-pass arrangement is preferable to a ﬂ ow restrictor after the sensor.

GAS IN side for atmospheric measurements, by means of a precision

GAS

Michell Instruments 51

GOOD MEASUREMENT PRACTICE

6.1 Sampling Hints

Measurement of moisture content is a complex subject, but does not need to be difﬁ cult. This section aims to explain the common mistakes made in measurement situations, the causes of the problem, and how to avoid them. Mistakes and bad practices can cause the measurement to vary from the expectation; therefore a good sampling technique is crucial for accurate and reliable results.

Transpiration and Sampling Materials

- 20

- 30

S8000 User’s Manual

- 40

- 50

Dew point (ºC)

- 60

- 70

12345

nickel

stainless steel

Time (hours)

nylon

copper

polyethylene

PTFE

All materials are permeable to water vapor, as the water molecule is extremely small compared to the structure of solids, even when compared to the crystalline structure of metals. The graph above shows the dew point inside tubing of different materials when purged with very dry gas, where the exterior of the tubing is in the ambient environment.

Many materials contain moisture as part of their structure, particularly organic materials (natural or synthetic), salts (or anything which contains them) and anything which has small pores. It is important to ensure that the materials used are suitable for the application.

If the partial water vapor pressure exerted on the outside of a compressed air line is higher than on the inside, the atmospheric water vapor will naturally push through the porous medium causing water to migrate into the pressurized air line. This effect is called transpiration.

Adsorption and Desorption

Adsorption is the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to the surface of a material, creating a ﬁ lm. The rate of adsorption is increased at higher pressures and lower temperatures.

Desorption is the release of a substance from or through the surface of a material. In constant environmental conditions, an adsorbed substance will remain on a surface almost indeﬁ nitely. However, as the temperature rises, so does the likelihood of desorption occurring.

In practical terms, as the temperature of the environment ﬂ uctuates, water molecules are adsorbed and desorbed from the internal surfaces of the sample tubing, causing small ﬂ uctuations in the measured dew point.

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Sample Tubing Length

The sample point should always be as close to the critical measurement point as possible, in order 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. It is clear from the graph shown above that the best materials to resist transpiration are stainless steel and PTFE.

Trapped Moisture

Dead volumes (areas which are not in a direct ﬂ ow 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 ﬁ lters, valves (e.g. rubber from pressure regulators) or any other parts of the system can also trap moisture.

GOOD MEASUREMENT PRACTICE

Sample Conditioning

Sample conditioning is often necessary to avoid exposure of sensitive measuring components to liquids and other contaminants which may cause damage or affect the accuracy over time, depending on the measurement technology.

Particulate ﬁ lters are used for removing dirt, rust, scale and any other solids that may be in a sample stream. For protection against liquids, a coalescing ﬁ lter should be used. The membrane ﬁ lter is a more expensive but highly effective alternative to a coalescing ﬁ lter. It provides protection from liquid droplets, and can even stop ﬂ ow to the analyzer completely when a large slug of liquid is encountered.

Condensation and Leaks

Dewpoint > T Dewpoint < T

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 changes the water vapor content of the gas being measured. Condensed liquid can alter the humidity elsewhere by dripping or running to other locations where it may re-evaporate.

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 but vortices at the leak point and a negative vapor pressure differential will also allow water vapor to contaminate the ﬂ ow.

Michell Instruments 53

GOOD MEASUREMENT PRACTICE

Flow Rates

Theoretically ﬂ ow rate has no direct effect on the measured moisture content, but in practice it can have unanticipated effects on response speed and accuracy. The optimal ﬂ ow rate varies depending on the measurement technology, and can always be found in the instrument or sensor manual.

An inadequate ﬂ ow rate can:

• 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 ﬂ ow.

• Increase the chance of contamination from back diffusion: ambient air that is wetter than the sample can ﬂ ow from the exhaust back into the system. A longer exhaust (sometimes called a pigtail) can also help alleviate this problem.

S8000 User’s Manual

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

An excessively high ﬂ ow rate can:

• Introduce back pressure, causing slower response times and unpredictable effects on equipment such as humidity generators.

• 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.

POSSIBLE INJURY! The tubing, valves and other apparatus

attached to this instrument must be adequate for the

maximum pressure which will be applied, otherwise physical

injury to the operator or bystander is possible.

Before disconnecting the S8000 from the gas line it is essential

to vent the system to atmospheric pressure, otherwise severe

injury could result.

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S8000 User’s Manual

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 an approved agent (for contact information go to www.michell. com).

If required for the calibration process, the instrument’s internal PRT can be made available for external connection as described in Section 3.2.10.

DCC function can be disabled for calibration purposes (refer to Section 3.2.6).

The

A calibration certiﬁ cate bearing a three point calibration is issued with each instrument. If required, an option is available to add further speciﬁ c calibration points. Contact Michell Instruments for further information (for contact information go to www.michell. com).

CALIBRATION

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Laboratory against Test Equipment traceable to the NATIONAL PHYSICAL LABORATORY, Middlesex, United Kingdom and to

the NATIONAL INSTITUTE OF STANDARDS & TECHNOLOGY, Gaithersburg, Maryland, USA.

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Figure 41

www.michell.com

Typical Calibration Certiﬁ cate

Michell Instruments 55

PREPARATION FOR SHIPPING

8 PREPARATION FOR SHIPPING

For shipping purposes, the instrument should be packed into its original carton, the latter providing the recommended degree of protection during transit. To prepare the instrument for shipping, proceed as follows.

1. Switch off the instrument and remove the power supply cable (see Section

2.5.1). If the instrument is rack mounted, ﬁ rst remove it from the rack, and remove the rack mount wings.

2. Remove the (optional) microscope and re-ﬁ t the blanking plug.

3. Remove the (optional) remote PRT (see Section 2.5.4).

4. If ﬁ tted, remove the USB communications cable (see Section 2.5.6).

5. Remove the analog and alarm output connectors (see Section 2.5.2 and Section 2.5.3).

6. Remove any connections to the 4-wire PRT output binding posts (see Section 2.5.5).

S8000 User’s Manual

7. Remove the connections to the

GAS IN and GAS OUT ports (see Section

2.5.99).

8. Pack the instrument in its original case as shown in

Figure 41.

NOTE: The

accessories should be packed in the box (4). Unless returning for repair, it is not necessary to return either the microscope or the analog and alarm connectors. All cables and the remote PRT probe (if supplied) should be returned for checking.

9. Enclose a packing list detailing all equipment contained in the box and seal the box. Ideally, for extra security, the box should be banded.

1 Side packing 2 S8000 Instrument 3 Side packing 4 Accessories box

5 Carton

Figure 42

Instrument Packing Details

56 97488 Issue 4, August 2018

S8000 User’s Manual

APPENDIX A

Appendix A

Technical Speciﬁ cations

Michell Instruments 57

APPENDIX A

Appendix A Technical Speciﬁ cations

Dew-Point Sensor Performance

Measurement Technology Chilled Mirror

Accuracy ±0.1 °C (±0.18 °F)

Reproducibility ±0.05°C (±0.09°F)

-60 to +40°Cdp (-76 to +104 °Fdp)

Measurement Range

S8000 User’s Manual

Operating Temperature Range

Operating Pressure

Sample Flow Rate

Detection System

-20 to +40°C (-4 to +104 °F)

Low Pressure Version: 0 to 1 barg (0 to 14.5 psig) High Pressure Version: 0 to 20 barg (0 to 290 psig)

0.1 to 1 Nl/min (0.2 to 2.1 scfh)

RRS Triple Detection

Remote PRT Probe (Optional)

Temperature Measurement 4 wire Pt 100, 1/10 DIN class B

Measurement Accuracy ±0.1 °C (±0.18 °F)

Cable Length 2m (6.6ft) (250m (820ft) max)

Flow Sensor

Measurement Accuracy

Measurement Range

Typical ±5% uncalibrated

0 to 1000 ml/min

Integrated Pressure Sensor (Optional)

Measurement Range 0 to 25 bara (0 to 377 psia)

Measurement Accuracy 0.25% Full Scale

Measurement Units psia, bara, KPa or MPag

58 97488 Issue 4, August 2018

S8000 User’s Manual

Monitor

Resolution User-selectable to 0.001 dependant on parameter

APPENDIX A

Measurement Units

Outputs

HMI 5.7" LCD touchscreen with white on blue graphics

Data Logging

Environmental Conditions -20 to +40°C (-4 to +104° F)

Power Supply 85 to 264 V AC, 47/63 Hz

Power Consumption 100 VA

EMC - Class A Emissions Industrial Location Immunity

°C and °F for dew point and temperature %RH, g/m

Analog: 3 channels, user-selectable 4-20 mA, 0-20 mA or 0-1 V Digital: Modbus RTU over USB, and optional Modbus RTU over

RS232, RS485 or 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 SD Card (FAT-32) - 32Gb max. that allows 24 million logs or 560 days, logging at 2 second intervals

Complies with EN61236:1997 (+A1/A2/A3)

, g/kg, ppmV , ppmW (SF6), for calculated humidities

Mechanical Speciﬁ cations

Dimensions 184 x 440 x 343mm (7.3 x 19 x 14.5") h x w x d

Weight 11.4kg (25.1lb)

General

Process connections 6mm Swagelok® (MALE) or 1/4” Swagelok® (MALE)

Storage Temperature -40 to +50°C (-40 to +122 °F)

Calibration

3-point traceable in-house calibration as standard UKAS accredited calibrations optional - please consult Michell

Michell Instruments 59

APPENDIX A

A.1 Dimensions

S8000 User’s Manual

186.9 mm

7.358 ins

178.5 mm

7.028 ins

34 mm

1.337 ins

440.0 mm

17.323 ins

342.9 mm

13.498 ins

46.0 mm

1.811 ins

177.0 mm

7.0 ins

144.5 mm

5.689 ins

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S8000 User’s Manual

APPENDIX B

Appendix B

Formatting SD Cards

Michell Instruments 61

APPENDIX B

Appendix B Formatting SD cards

Before an SD card can be used for the storage of datalog results it must ﬁ rst be formatted. Initially the card must be connected to a card reader which must, in turn, be connected to the host computer. Most proprietary card readers connect to the host via a USB port. Almost all laptop/notebook PC’s are equipped with an SD card reader slot.

The formatting procedure is as follows:

1. Insert the card into the card reader and open Windows Explorer. The card will be reported as Removable storage device.

S8000 User’s Manual

2. Right click on the card icon and select from the pop-up menu (refer to

3. The

4. In the

Format dialogue box is now presented

as shown in is reported on the top line (1). This will depend upon the type of disk used (470 MB in this example).

File system box (2),

Figure 43,

and the disk capacity

Figure 43,

Format

Figure 42)

select

FAT32.

5. In the this set to Default allocation size.

6. If required, in the enter a volume label e.g. S8000.

7. The SD card requires a full format so leave the

8. Click the

(Figure 44)

proceed.

Allocation unit size box (3), leave

Volume label box (4),

Quick format box (5) unchecked.

Start button (6). The message

will now appear. Click OK to

Figure 43

1 2 3

Select Format

Figure 44

Figure 45

Set Format Properties

Format Disc

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APPENDIX C

Appendix C

Calculations

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APPENDIX C

Appendix C Calculations

C.1 Water Content

The accuracy of the humidity calculations was determined by comparing the displayed value to corresponding values calculated from the formulae below, using a PRT simulator to set a dew-point value and the Michell Humidity Calculator to calculate the water vapor pressure (wvp).

ppm

(dry) = (wvp/(101325-wvp) * 106

ppm

(wet) = (wvp/101325) * 106

ppm

SF6 (wet & dry) = ppmV * 0.12334954

g/kg = ppm

g/m

= (217/(273.15 + Dp)) * (wvp/100)

Note: ppmV can be calculated on a dry or wet basis depending upon bit 10 in the units command register, which can be set via the Application software.

* 0.0006212138

S8000 User’s Manual

C.2 Temperature - Dew Point

PRT simulators are used to simulate the dew-point and ambient temperature sensors. For each pair of temperature readings the instrument display is read and the actual t-dp readings recorded. Each of these readings is then compared against calculated t-dp, readings using the same input parameters to the Michell Humidity Calculator.

C.3 °C to °F Calculation

PRT simulators are used to input simulated temperatures, measured in °C, into both measurement channels.

For each measurement channel, the corresponding display is set to read the input temperature in °F. For each channel the temperature reading on the instrument display, corresponding to the series of simulated PRT inputs, is read and recorded. Each of these readings is then compared against a corresponding temperature calculated from the following formula.

Conversion formula. °F = ((°C*9)/5) +32

C.4 % RH Calculation

PRT simulators are used to input simulated dew-point and ambient temperatures, measured in °C, into both measurement channels.

For each pair of inputs, the reading on the instrument’s % RH display is recorded. Each of these readings is then compared against a corresponding % RH value calculated by inputting the same parameters to the Michell Humidity Calculator.

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C.5 Conversion of bara to psia and kPa

Use a calibrated 4-20 mA source (Q0356) to simulate a range of applied pressures covering the instruments' full pressure measurement span of 0 to 25 bara (0 to 377 psia) (1.56 bar/mA).

For each input current, record the display reading for all three units.

For each display reading, calculate the corresponding pressure in the relevant units from the following formula.

Psia = ((bara-1)*14.5) + 14.7

Kpa = bara*100

APPENDIX C

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APPENDIX D

S8000 User’s Manual

Appendix D

Modbus

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Appendix D Modbus RTU Communications

D.1 Introduction

S8000 instruments have a Modbus communications interface via the USB port that enables remote access to the instrument’s conﬁ guration and data logging facilities. This protocol offers two-way communication between a host (PC), (known as the master unit), and one or more instruments, (known as slave units).

Once communication is established by the master unit, reading or writing to holding registers within an addressed slave unit is possible. The master unit can obtain measured values and status information by reading registers and can respond to data contained within these registers by writing back.

The tables in this Appendix list these registers, as they apply to the S8000 instrument, and specify the number and data formats that apply to each register.

D.2 Basic Modbus Operation

There are two possible Modbus transmission modes - ASCII and RTU (Remote Terminal Unit). The S8000 instrument is classed as an RTU.

APPENDIX D

Communication between a host system (e.g. PC) operates on a Query-Response Cycle (see message, tells the addressed slave device what actions to perform using the information contained in the data bytes.

An error checkﬁ eld provides a method for the slave to validate the integrity of the message contents. If the slave makes a normal response, the function code in the response is an echo of the function code in the query and the data bytes will contain data collected by the slave e.g. holding register values or status information. If an error occurs, the function code is incremented by 80H (most signiﬁ cant bit set to 1) to indicate that the response is an error response, and the associated data bytes contain a code to deﬁ ne the error.

The error check ﬁ eld, CRC (Cyclic Redundancy Check), allows the master to conﬁ rm that the message contents are valid.

Figure 45)

, where a speciﬁ c Modbus function code, embedded in the query

Figure 46

Modbus Connection

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APPENDIX D

D.3 Modbus RTU Connections and Protocol

The physical connection from the master to the S8000 uses a USB connection cable between the host and the instrument’s communications connector. Refer to Section

2.5.6 for details of the connection of this cable.

The serial port protocol is as follows:

Baud Rate: 9600

Start Bits: 1

Data bits: 8

Parity: None

Stop bits: 2

Typically, a Modbus RTU message is structured as follows:

S8000 User’s Manual

Byte 1 Slave Address Value 1-247

Byte 2 Modbus Function Code Value 3 (e.g read register)

Byte 3 Start Address (Low byte) Value 0 - 255

Byte 4 Start Address (High byte) Value 0 - 255

Byte 5 No. Registers to read (Low byte) Value 0 - 255

Byte 6 No. Registers to read (Low byte) Value 0 - 255

Byte 7 Error Check

D.4 Register Map

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

speciﬁ ed by a high and low byte contained in the query message, to be addressed and read by the same message.

Value

Table 16 describes the instruments' registers with their respective address locations, together with their relevant register conﬁ gurations and register map deﬁ nitions. NOTE:

Hexadecimal (Hex) addresses marked with an asterisk denote instrument speciﬁ c parameters stored in the instrument’s ﬂ ash memory.

The register maps, Tables 17 to 29, deﬁ ne the data allocated to each bit/byte of that speciﬁ c register.

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APPENDIX D

Address

dec

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* DCC duration + Hold Time Duration minutes R/W K DCC_HOLD_TIME 20 0014* Measurement Time Hours + Minutes R/W K MEASURE_TIME 21 0015* Phase Time Hours R H PHASE_TIME_HRS 22 0016 Phase Time Minutes + Phase Time Seconds R K PHASE_TIME_MIN_SEC 23 0017* Film thickness setting R/W A FILM_THICKNESS 24 0018 Live ﬁ lm thickness value R A LIVE_FILM_THICKNESS 25 0019* Analog 1 output maximum value R/W M MAX_MA1 26 001A* Analog 1 output minimum value R/W M MIN_MA1 27 001B* Analog 2 output maximum value R/W M MAX_MA2 28 001C* Analog 2 output minimum value R/W M MIN_MA2 29 001D* Analog 3 output maximum value R/W M MAX_MA3 30 001E* Analog 3 output minimum R/W M MIN_MA3 31 001F* Analog output conﬁ guration 1 R/W B1 OP_SELECTION1 32 0020* Analog output conﬁ guration 2 R/W B2 OP_SELECTION2 33 0021* Logging Interval R/W H LOG_INTERVAL 34 0022* Units/ Command R/W E UNITSCOMMAND 35 0023* Mirror Temp Set-Point during DCC R/W M MIRROR_TEMP_SETP 36 0024* Emitter Drive R/W H EMITTERDRIVE 37 0025 Stability Time R/W H STABILITY_TIME 38 0026 RTC Year(val1) + Month (val2) R/W K YEARMONTH 39 0027 RTC Date (val1) + Hours(val2) R/W K DATEHRS 40 0028 RTC Mins(val1) + Secs (val2) R/W K MINSSECS 41 0029* Display Setting 1 R/W F DISPLAY_SETTING1 42 002A* Display Setting 2 R/W F DISPLAY_SETTING2 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* Process Alarm Conﬁ guration / Display Contrast R/W P ALARMCONFIG_DISPCONT 53 0035* Process Alarm Set Point R/W M PROCESSALARM_SP_HI

Address

hex

0 0000* Instrument Address R/W 0001H H INSTID 1 0001 Dew point Value – Hi Word R N HUMIDITY_HI 2 0002 Dew point Value – Lo Word R N HUMIDITY_LO 3 0003 Ambient Temperature – Hi Word R N AMBTEMP_HI 4 0004 Ambient Temperature – Lo Word R N AMBTEMP_LO 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

Function

Read/

Write

Default

Value

Hex

Table 16 Modbus Holding Register Map

Michell Instruments 69

APPENDIX D

S8000 User’s Manual

Table 17 Register Conﬁ guration A

Table 18 Register Conﬁ guration B1

Table 19 Register Conﬁ guration B2

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Table 20 Register Conﬁ guration D Status Word

APPENDIX D

Table 21 Register Conﬁ guration E Units

Table 22 Register Conﬁ guration F Display Setting A

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APPENDIX D

S8000 User’s Manual

Table 23 Register Conﬁ guration F Display Setting B

Table 24 Register Conﬁ guration H

Table 25 Register Conﬁ guration J

Table 26 Register Conﬁ guration K

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APPENDIX D

Table 27 Register Conﬁ guration L

Table 28 Register Conﬁ guration M

The humidity values for sensors 1 & 2 are represented in IEEE-754 single precision ﬂ oating point format, in order to cater for the wide range in the value of ppm format is ‘Big Ended’ which means that the high 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.

Table 29 Register Conﬁ guration N

. This

Michell Instruments 73

APPENDIX D

S8000 User’s Manual

Table 30 Register Conﬁ guration P

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APPENDIX E

Appendix E

Default Values

Michell Instruments 75

APPENDIX E

Appendix E Default Values

The default values for the HMI Settings are as follows:

Main Page

Top Dew point Middle ppm Bottom g/m Flow Fixed

Outputs

1 4-20 mA, dew point, -60 to +20 °C 2 4-20 mA, ppm 3 4-20 mA, ﬂ ow, 0 to 1000 ml

, 0 to 3000

S8000 User’s Manual

Alarm 0°Cdp

Display

Resolution 2 decimal places Primary Unit °C Pressure unit bara Stability 0:01 FAST ON PRT Mode Internal Language English Brightness 100

DCC

Display Hold OFF Period 0:02 Reset Optics reset Set point Δ 20°C Interval 4:00 Output Hold 0:20

Logging Interval 0:05

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APPENDIX E

Appendix F

Quality, Recycling

& Warranty

Information

Michell Instruments 77

APPENDIX E

S8000 User’s Manual

Appendix F 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

• Conﬂ ict 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.

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APPENDIX G

Appendix G

Return Document

Decontamination Declaration

Michell Instruments 79

APPENDIX G

S8000 User’s Manual

Appendix G Return Document & Decontamination Declaration

'HFRQWDPLQDWLRQ&HUWL¿FDWH

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

PDWHULDOV)RUPRVWDSSOLFDWLRQVLQYROYLQJVROYHQWVDFLGLFEDVLFÀDPPDEOHRUWR[LFJDVHVDVLPSOHSXUJHZLWKGU\ JDVGHZSRLQW&RYHUKRXUVVKRXOGEHVXI¿FLHQWWRGHFRQWDPLQDWHWKHXQLWSULRUWRUHWXUQ

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

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Michell Instruments S8000 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual