Michell Instruments S8000 Operating Manual

S8000

Chilled Mirror Hygrometer

User’s Manual

97488 Issue 4

August 2018

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S8000

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This document is the property of Michell Instruments Ltd. and may not be copied or

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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

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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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