LTH MOD53 Operation Manual

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Page 1

MOD53

DISSOLVED OXYGEN MONITOR

OPERATION GUIDE

Page 2

Preface

Product warranty

The MOD53 has a warranty against defects in materials and workmanship for three years from the date of shipment. During this period LTH will, at its own discretion, either repair or replace products that prove to be defective. The associated software is provided ‘As is’ without warranty.

Limitation of warranty

The foregoing warranty does not cover damage caused by accidental misuse, abuse, neglect, misapplication or modification.

No warranty of fitness for a particular purpose is offered. The user assumes the entire risk of using the product. Any liability of LTH is limited exclusively to the replacement of defective materials or workmanship.

There are no user serviceable parts, including fuses etc., within the unit. Any attempt to dismantle the instrument will invalidate the warranty.

Disclaimer

LTH Electronics Ltd reserves the right to make changes to this manual or the instrument without notice, as part of our policy of continued developments and improvements.

All care has been taken to ensure accuracy of information contained in this manual. However, we cannot accept responsibility for any errors or damages resulting from errors or inaccuracies of information herein.

MOD53 is a trademark of LTH Electronics Ltd

Fifth Edition August 2005

Part number : 6136

LTH Electronics Ltd Chaul End Lane Luton Telephone: +44 (0)1582 593693 Bedfordshire Fax: +44 (0)1582 598036 LU4 8EZ email: [email protected] England Web: www.lth.co.uk

Page 3

Preface

Manufacturing Standards

Electromagnetic compatibility

This instrument has been designed to comply with the standards and regulations set down by the European EMC Directive

Safety

This instrument has been designed to comply with the standards and regulations set down by the European Low Voltage Directive using BS EN 61010-1 : 1993

Quality

This instrument has been manufactured under the following quality standard : ISO 9001:2001. Certificate No : FM 13843

Note: The standards referred to in the design and construction of LTH products are those prevailing at the time of product launch. As the standards are altered from time to time, we reserve the right to include design modifications which are deemed necessary to comply with the new or revised regulations.

Page 4

Contents

Preface..................................................................................................................1

Contents ...............................................................................................................3

1 Introduction.....................................................................................................5

About the MOD53 ............................................................................................5

Unit Specification .............................................................................................5

2 Installation – Safety & EMC............................................................................7

Wiring Installation ............................................................................................7

3 Installation – Panel Mount .............................................................................9

Top Connector ...............................................................................................11

Supply Voltage Connections..........................................................................11

Current Output Connections ..........................................................................12

Set Point Relay Connections .........................................................................12

Set Point Relays 3 & 4 Connection ................................................................13

Bottom Connector ..........................................................................................14

Sensor Input Connections..............................................................................14

Sensor Types.................................................................................................15

Temperature Input Connections.....................................................................16

Pressure Transmitter Input.............................................................................17

RC2 Cleaner Connection ............................................................................... 17

Digital Inputs ..................................................................................................18

4 Installation – Surface Mount........................................................................19

Pipe Mounting ................................................................................................20

Terminal Connections ....................................................................................21

Supply Voltage Connections..........................................................................21

Current Output Connections ..........................................................................22

Relay Connections.........................................................................................23

Sensor Input Connections..............................................................................24

Sensor Types.................................................................................................24

Temperature Input Connections.....................................................................26

Pressure Transmitter Input.............................................................................27

RC2 Cleaner Connection ............................................................................... 27

Digital Inputs ..................................................................................................28

5 User Interface................................................................................................29

The Front Panel .............................................................................................29

The Menu System ..........................................................................................30

Error Messages..............................................................................................30

Access Entry ..................................................................................................30

Unit Configuration ..........................................................................................34

6 Main Display..................................................................................................37

7 Parameters ....................................................................................................41

Units...............................................................................................................43

Sensor Type...................................................................................................44

Temperature Input..........................................................................................44

Salinity............................................................................................................44

Page 5

Contents

Pressure Compensation.................................................................................45

Simulated Input ..............................................................................................45

8 Set Points ......................................................................................................47

Set Point Source ............................................................................................49

Set Point Trigger ............................................................................................49

Set Point Mode...............................................................................................50

Dose Alarm Timers ........................................................................................51

Set Point 4......................................................................................................52

9 Current Output ..............................................................................................53

Input ...............................................................................................................54

Output Range.................................................................................................54

Zero & Span ...................................................................................................54

Dual current outputs.......................................................................................55

Proportional Control .......................................................................................55

Error Condition...............................................................................................55

10 Calibration ...................................................................................................57

On-Line/Off-Line Operation............................................................................59

Calibration Access .........................................................................................59

Automatic Calibration.....................................................................................59

Sensor Calibration..........................................................................................60

Temperature Calibration ................................................................................61

Pressure Input Calibration..............................................................................62

Current Output Calibration .............................................................................63

Resetting The User Calibration ......................................................................64

11 Save & Restore ...........................................................................................65

12 Pressure Input.............................................................................................67

13 Configuration ..............................................................................................71

14 Sensor Cleaning .........................................................................................73

15 Fault Finding ...............................................................................................75

16 OE15 Membrane Replacement ..................................................................79

17 Guarantee and Service...............................................................................81

Appendix A – DO Measurement .......................................................................83

Appendix B – Probe Parameters ......................................................................85

Appendix C – Factory Default Setups..............................................................87

Appendix D – Customer Setup .........................................................................91

Appendix E – Calibration ..................................................................................95

Appendix F – Temperature Sensor Data..........................................................97

Appendix G – Pressure Conversions...............................................................99

Appendix H – Oxygen Solubility.....................................................................101

Appendix I – Error Messages..........................................................................103

Index .................................................................................................................107

Page 6

1 Introduction

ABOUT THE MOD53

The MOD53 is a microprocessor controlled dissolved oxygen measurement instrument. It uses a multifunction LCD to display readings and provide feedback to the operator. Different options provide fully configurable control, alarm and feedback with up to four relays and two 0/4-20mA current output sources.

UNIT SPECIFICATION

Sensor Input Galvanic (Mackereth) 0 to 9.999mA or Polargraphic

(Clark) 0 to 500.0nA.

Sensor Bias Voltage Software Programmable, -1.000 to +1.000V,

Resolution ±1mV, Output Accuracy ±3mV

Sensor membrane correction factor

Software Programmable

0 to 9999 Sensor Cable Up to 100 metres Ranges of

Measurement

0 - 199.9 % saturation, 0 - 30.00 ppm Concentration,

0 – 999.9 mmHg (Calibration specific)

0 – 9999 mBar pO

(Calibration specific)

Accuracy

±3µA (Galvanic Mode), ±1.0nA (Polargraphic Mode) Linearity

±0.1% of Range Repeatability

±0.1% of Range Temperature Sensor 4 wire interface, operating with up to 100 metres of

cable. Software selectable sensor type including

PT100 & PT1000 RTD. Measurement Range

-50°C to +300°C (when using PT100 or PT1000)

Temperature Accuracy

±0.2°C (Dependant on Sensor Configuration) Operator Adjustment

(Temperature)

± 50°C, or ± 122°F

Temperature Compensation

Automatic, or Manually set from 0°C to 100°C

Pressure Compensation

Actively from 4-20 mA input (Direct or 24V loop

powered from the MOD53.) Software Scalable.

or User Programmable from 0.50 – 9.99 bar

With user Selectable Pressure Damping

Salinity Compensation User Programmable from 0 – 40.0 ppt Ambient Operating

Temperature

-20°C to +50°C (-4°F to +122°F) for full specification.

Ambient temperature variation

±0.01% of range / °C (typical)

Page 7

1 Introduction

User Interface Large 4 character 7-segment display for measured

value, with alphanumeric dot matrix characters for

units, information and programming. Easy to use four

button user interface for programming. Current output

(optional 1 or 2 outputs)

Selectable 0-20mA or 4-20mA operation into a 1000Ω

maximum load, fully isolated to 2kV. Selectable

transmission of either sensor reading or temperature,

and software scalable within the operating range.

Can be configured as a clean output so that the signal

switches between 0 to 20mA. Operator adjustment

(Current)

±1mA zero and ±1mA span for remote monitor

calibration Set Point Relays

(2 standard, 4 optional)

Fully configurable set points with volt free contacts.

Rated 5A 30V DC / 5A 250VAC (non-inductive). Operating Modes

(Relays 1,2 & 3)

Configurable High, Low, Band or Latch trigger

conditions, with On/Off, Time Proportioning, Pulse

Proportioning, and Cleaning modes for each relay.

Adjustable delay timers up to 10 mins, and hysteresis

in On/Off mode. Adjustable dose alarm timer to 15

mins in all modes. Adjustable cycle time and band in

“Proportioning” modes. Adjustable duration, recovery

and interval periods in “Cleaning” mode. Operating mode

(Alarm relay 4)

The relay can be set to energise on any one of the

following instrument conditions:- Sensor alarm, Dose

alarm, Calibration, Off line, Any error Off-Line Facility

(for calibration and commissioning)

Initiated by remote contact closure or software

selection. Relays 1, 2 & 3 are de-energised and the

current outputs are held at the last On-Line value. EMC : Immunity BS EN 50082-2 1995 EMC : Emissions BS EN 50081-1 1992 Safety Designed and manufactured in accordance with BS

EN 61010-1 1993 Power Supply Optional

85 to 250V AC or DC 10W max.

18 to 36V AC or DC 15 W max Panel Mount Housing Flame retarding ABS plastic, rated to IP66 to the front

when installed in a panel. Weight Less than 0.6kg Dimensions 96mm x 96mm x 140mm (H x W x D), including

connectors Surface Mount Housing Expanded polyurethane foam rated to IP66 Weight Less than 1.5kg Dimensions

305mm x 200mm x 82mm (H x W x D), excluding

mounting brackets

Page 8

2 Installation – Safety & EMC

This chapter describes how to install and mount the MOD53, and how to connect the unit to a power source and auxiliary equipment.

Although today’s electronic components are very reliable, it should be anticipated in any system design that a component could fail and it is therefore desirable to make sure a system will fail safe. This could include the provision of an additional monitoring device, depending upon the particular application and any consequences of an instrument or sensor failure.

WIRING INSTALLATION

The specified performance of the MOD53 is entirely dependent on correct installation. For this reason, the installer should thoroughly read the following instructions before attempting to make any electrical connections to the unit.

CAUTION !

: ALWAYS REMOVE THE MAIN POWER FROM THE SYSTEM

BEFORE

ATTEMPTING ANY ALTERATIONS TO THE W IRING. ENSURE THAT

BOTH

POWER INPUT LINES ARE ISOLATED. MAKE SURE THAT THE POWER CANNOT BE SWITCHED ON BY ACCIDENT WHILST THE UNIT IS BEING CONNECTED. FOR SAFETY REASONS AN EARTH CONNECTION MUST BE MADE TO THE EARTH TERMINAL OF THIS INSTRUMENT.

LOCAL WIRING AND SAFETY REGULATIONS SHOULD BE STRICTLY ADHERED TO WHEN INSTALLING THIS UNIT. SHOULD THESE REGULATIONS CONFLICT WITH THE FOLLOWING INSTRUCTIONS, CONTACT LTH ELECTRONICS OR AN AUTHORISED LOCAL DISTRIBUTOR FOR ADVICE.

To maintain the specified levels of Electro Magnetic Compatibility (EMC, susceptibility to and emission of electrical noise, transients and radio frequency signals) it is essential that the types of cables recommended within these instructions be used. If the installation instructions are followed carefully and precisely, the instrument will achieve and maintain the levels of EMC protection stated in the specification. Any equipment to which this unit is connected must also have the same or similar EMC control to prevent undue interference to the system.

♦ Terminations at the connectors should have any excess wire cut back so that

a minimal amount of wire is left free to radiate electrical pick-up inside or close to the instrument housing.

♦ The terminal cover of the surface mount unit must be correctly re-assembled

and securely fastened, to maintain a continuous electro-magnetic shield around the instrument.

N.B. The use of CE marked equipment to build a system does not necessarily mean that the completed system will comply with the European requirements for EMC and therefore CE marking.

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2 Installation – Safety & EMC

Noise suppression

In common with other electronic circuitry, the MOD53 may be affected by high level, short duration noise spikes arising from electromagnetic interference (EMI) or radio frequency interference (RFI). To minimise the possibility of such problems occurring, the following recommendations should be followed when installing the unit in an environment where such interference could potentially occur.

The following noise generating sources can affect the MOD53 through capacitive or inductive coupling.

• Relay coils

• Solenoids

• AC power wires, particularly at or above 100V AC

• Current carrying cables

• Thyristor field exciters

• Radio frequency transmissions

• Contactors

• Motor starters

• Business and industrial machines

• Power tools

• High intensity discharge lights

• Silicon control rectifiers that are phase angle fired

The MXD53 series is designed with a high degree of noise rejection built in, to minimise the potential for interference from these sources, but it is recommended that you apply the following wiring practices as an added precaution. Cables transmitting low level signals should not be routed near contactors, motors, generators, radio transmitters, or wires carrying large currents.

If noise sources are so severe that the instrument’s operation is impaired, or even halted, the following external modifications should be made, as appropriate:

• Fit arc suppressors across active relay or contactor contacts in the vicinity.

• Run signal cables inside steel tubing as much as is practical.

• Use the internal relays to switch external slave relays or contactors when

switching heavy or reactive loads.

• Fit an in-line mains filter close to the power terminals of the instrument.

Page 10

3 Installation – Panel Mount

The panel-mounting version is designed to be flush mounted and sealed in a square cut-out in a panel, and is held in place with the two screw clamps provided.

Figure 1 : Overall dimensions panel-mounting MOD53

• The panel cut-out for mounting the unit should be 92 mm x 92 mm (+1.0 – 0.0).

• A sealing gasket is supplied with the MOD53 to be fitted around the edge of the

cut-out.

• Two screw clamps are supplied and are fitted from the back of the instrument.

• Take care to ensure the gasket is correctly positioned before tightening the

clamps.

• A badly fitted gasket will not give a good seal to the specified IP rating.

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3 Installation – Panel Mount

Unit Connection

Connections to the panel-mounted version of the MOD53 are made with up to four plug and socket terminal blocks, accessible to the rear of the unit.

Top Connector

Bottom Connector

Expansion Port where fitted

Earth Stud

Figure 2 : Panel mount unit, rear view

The top connector houses the power input, relay and current output terminals. The bottom connector houses the sensor input, temperature sensor input and the digital inputs. The expansion port provides for additional enhancements such as the third and fourth relay connection.

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3 Installation – Panel Mount

TOP CONNECTOR

Figure 3 : Panel mount unit, top connector wiring

SUPPLY VOLTAGE CONNECTIONS

The MOD53 can be powered from either an AC or DC supply voltage. The unit provides two terminals for each of the input connections (“Live” & “Neutral” for an AC input, or + & - for a DC Input), plus an “Earth” terminal. This allows the supply to be “daisy chained” to the relay contacts and/or other instruments. The instrument uses a universal power supply that accepts a wide range of voltage and frequency inputs. Refer to the label adjacent to the power supply terminals for the input voltage limits. Exceeding these limits may damage the instrument.

Figure 4 : Power supply connection

The power supply should be taken from an isolated spur and fused to a maximum of 3 Amps. If the relays require greater current, then a separate 5A fuse will be required. The incoming Earth connection must be connected to the “Earth”

terminal.

MOD53

OUT IN

Page 13

3 Installation – Panel Mount

CURRENT OUTPUT CONNECTIONS

The MOD53 can be supplied with up to 2 current outputs designated A and B. It is shipped with links across the relevant current output pins if the option is fitted. If a current output is required, remove the link and replace with a cable terminated by a load resistance not exceeding 1000Ω. For best noise immunity, use a screened twisted pair cable, with the screen connected to Earth at one end. Use a sufficiently large cable to avoid a high resistance in the overall current loop. When

either of the outputs is open circuit, in a dual output unit, the other will indicate a fault by transmitting a 2mA signal. This will be accompanied by a flashing error message on the Display (E41, see Appendix I)

SET POINT RELAY CONNECTIONS

The relay contacts are connected to the terminals only and are electrically isolated from the instrument itself. They must be connected in series with a 5 Amp fuse.

MOD53

Load A

Neutral

Live

Neutral

Load B

Figure 5 : Relay contact connection

A contact arc suppressor may be required to prevent excessive electrical noise, depending upon the load. To switch more than 5 Amps will require a slave relay.

MOD53

Slave Relay

Neutral

Live

Figure 6 : Slave relay connection

Page 14

3 Installation – Panel Mount

For convenience, the power can be looped across from the supply connections.

SET POINT RELAYS 3 & 4 CONNECTION

When fitted, the expansion port connector houses the additional relay output terminals. NB The relay contacts are volt free and should be wired in series with a supply and load { see Figure 5.}

NOTE :

NC = normally closed

NO = normally open

C = common

Figure 7 : Panel mount unit, Relays 3 & 4 wiring

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3 Installation – Panel Mount

BOTTOM CONNECTOR

The bottom connector houses the sensor input and digital input connections. Two separate connectors are used, separated by a blanking plug. A 9 way connector is provided for the sensor input and a 4 way connector for the digital inputs.

Figure 8 : Panel mount unit, bottom connector wiring

SENSOR INPUT CONNECTIONS

The MOD53 has been designed with the flexibility to accept a wide variety of both Galvanic and Polargraphic Dissolved Oxygen probes. Parameters such as membrane correction, bias voltage and temperature sensor type can be easily programmed into the instrument. It will be necessary to identify the sensor type e.g. Galvanic or Polargraphic, and the temperature sensor type e.g. PT1000 or thermistor.

Figure 9 : Sensor Connections

Page 16

3 Installation – Panel Mount

SENSOR TYPES

The following figures give the connection details of the most commonly used LTH cable types. Do not use any other type of cable than those recommended by LTH or the sensor manufacturer to extend the sensor / instrument distance.

Figure 10 : OE15 Cable

The outer screen/shield should be connected to the centre Earth Stud.

Figure 11 : ProcessProbe

Cable

Page 17

3 Installation – Panel Mount

TEMPERATURE INPUT CONNECTIONS

The temperature input system is designed to measure resistive temperature sensors. These can be configured as 2 or 4 wire sensors, although for the specified accuracy it is necessary to use the 4 wire configuration for cable lengths over 5 metres.

Figure 12 : Standard RTD Temperature Connection

Figure 13 : ProcessProbe 22K Thermistor Connection

The MOD53 can be configured to accept a PT100, PT1000, 1K or 22K thermistor temperature sensor. (see “Configuration” page)

A A B B A A B B

4 Wire RTD 2 Wire RTD

Page 18

3 Installation – Panel Mount

PRESSURE TRANSMITTER INPUT

The MOD53 can accept a 4-20mA input signal from a pressure transmitter. This can be scaled within software and permits active pressure compensation of the dissolved oxygen measurement. The signal can be either 24V loop powered, from the MOD53, or externally powered from the transmitter. The mode of operation is selected in the software set-up.

Figure 14 : Pressure Transmitter Connections

{ NB : The negative connection shares the same terminal as the Galvanic sensor anode connection }

RC2 CLEANER CONNECTION

If the active pressure input is not being used, an RC2 rotary cleaner can be powered from the “P” terminal. Connect the cleaner terminals through one of the relay terminals* in the same polarity as for the active pressure input. Set the “P

Mode” function to “Auto” . Set the Pressure “Input” to “24V Loop”. Reset the “P Mode” function to “Manual” . Configure the chosen relay (*) to “Cleaning” .

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3 Installation – Panel Mount

DIGITAL INPUTS

The digital inputs are used to externally initiate a clean cycle or take the unit OffLine. These inputs are intended to be switched using a volt free link , switch or relay. Closing the contact will initiate the appropriate action.

Figure 15 : Digital Inputs

Page 20

4 Installation – Surface Mount

The surface mounting version is designed for fixing to a wall or other flat surface. Three 6.5 mm diameter holes are provided for this purpose. Note that fasteners are not provided.

Figure 16 : Overall dimensions surface mounting MOD53

♦ LTH recommend using No. 10 x 1¼ inch round head screws or similar for

mounting.

♦ Care must be taken when fitting the unit to uneven walls or surfaces. Do not

over stress the three mounting lugs.

♦ Over tightening the mounting screws could also break the lugs.

Page 21

4 Installation – Surface Mount

PIPE MOUNTING

The handrail & pipe mounting version is designed for fixing to a vertical or horizontal handrail or pipe, of 25 - 60 mm outside diameter. The mounting kit comprises one plate, two channels, two clamps, four studs, 3 x M5 nuts, 3 x M5 plain washers, 3 x M5 shake proof washers, 12 x M4 nuts and 12 x M4 shake proof washers, as shown in the exploded view below.

Figure 17 : MOD53 handrail & pipe mounting brackets

• The brackets can be fitted either vertically or horizontally.

• Position the channels to the rear of the mounting plate and secure with 8 x M4

nuts and 8 x M4 shake proof washers as shown.

• Position the mounting plate assembly onto the pipe/handrail ensuring that the

single fixing hole for the controller is at the top.

• Secure the two pipe clamps with the 4 x M4 nuts and 4 x M4 shake proof

washers.

• Attach the controller to the mounting plate with the 3 sets of M5 fixings supplied.

Page 22

4 Installation – Surface Mount

TERMINAL CONNECTIONS

Having ensured that the main power is isolated from the unit, remove the terminal cover by releasing the screws at each corner. (The terminal cover is the small cover at the bottom of the front panel. Once the cover has been removed the following terminal arrangement should be visible. Some terminals may not be fitted due to different supplied options.

Figure 18 : Surface mount unit, terminal connections

The cables should be fed through the cable glands. After each cable has been attached, pull most of the cable slack back through the cable gland to prevent any unwanted RF energy from being radiated inside the housing. Make sure not to strain the cable within the instrument. Tighten the cable gland onto the cable so that it grips sufficiently to seal and to prevent the cable from being pulled back through the gland.

SUPPLY VOLTAGE CONNECTIONS

Page 23

4 Installation – Surface Mount

Figure 19 : Power supply “daisy chain” connection

terminal.

CURRENT OUTPUT CONNECTIONS

The MOD53 can be supplied with up to 2 current outputs designated A and B. It is shipped with links across the relevant current output pins if the option is fitted. If a current output is required, remove the link and replace with a cable terminated by a load resistance not exceeding 1000Ω. For best noise immunity use a screened twisted pair cable, with the screen connected to Earth at one end. Use a sufficiently large cable to avoid a high resistance in the overall current loop. When either of

the outputs is open circuit, in a dual output unit, the other will indicate a fault by transmitting a 2mA signal. This will be accompanied by a flashing error message on the Display ( E41 ).

MOD53

OUT IN

Page 24

4 Installation – Surface Mount

RELAY CONNECTIONS

The relay contacts are connected to the terminals only and are electrically isolated from the instrument itself. They must be connected in series with a 5 Amp fuse.

MOD53

Load A

Neutral

Live

Neutral

Load B

Figure 20 : Relay contact connection

A contact arc suppressor may be required to prevent excessive electrical noise, depending upon the load. To switch more than 5 Amps will require a slave relay.

MOD53

Slave Relay

Neutral

Live

Figure 21 : Slave relay connection

For convenience, the power can be looped across from the supply connections.

Page 25

4 Installation – Surface Mount

SENSOR INPUT CONNECTIONS

The MOD53 has been designed to accept a wide variety of both Galvanic and Polargraphic Dissolved Oxygen probes. Parameters such as membrane correction, bias voltage and temperature sensor type can be easily programmed into the instrument. It will be necessary to identify the sensor type e.g. Galvanic or Polargraphic, and the temperature sensor type e.g. PT1000 or thermistor.

Figure 22 : Sensor Connections

SENSOR TYPES

The outer screen/shield should be connected to the centre Earth Stud.

Figure 23 : OE15 Cable

Page 26

4 Installation – Surface Mount

Figure 24 : ProcessProbe

Cable

Page 27

4 Installation – Surface Mount

TEMPERATURE INPUT CONNECTIONS

Figure 25 : Standard RTD Temperature Connection

Figure 26 : ProcessProbe 22K Thermistor Connection

The MOD53 can be configured to accept a PT100, PT1000, 1K or 22K thermistor temperature sensor. (see “Configuration” page).

Page 28

4 Installation – Surface Mount

PRESSURE TRANSMITTER INPUT

Figure 27 : Pressure Transmitter Connections

{ NB : The negative connection shares the same terminal as the Galvanic sensor anode connection }

RC2 CLEANER CONNECTION

Mode” function to “Auto” . Set the Pressure “Input” to “24V Loop” . Reset the “P Mode” function to “Manual”. Configure the chosen relay (*) to “Cleaning” .

Page 29

4 Installation – Surface Mount

DIGITAL INPUTS

Figure 28 : Digital Inputs

Page 30

5 User Interface

CAUTION!

BEFORE PROCEEDING, ENSURE THAT THE INSTALLATION INSTRUCTIONS HAVE BEEN FOLLOWED CORRECTLY. FAILURE TO DO SO MAY RESULT IN AN ELECTRICALLY HAZARDOUS INSTALLATION, OR DEGRADE INSTRUMENT PERFORMANCE.

When shipped the MOD53 is configured to the default % saturation set-up. In this state, the instrument can perform all of the necessary function for a basic dissolved oxygen monitoring instrument.

THE FRONT PANEL

The MOD53 uses a versatile dot matrix character LCD to display all of the settings and readings. The seven segment digits at the top of the display indicate the primary measured value during normal operation. The six character display to the right of these indicates the units of measurement when a value is being displayed. The sixteen characters on the bottom of the display are used to indicate secondary readings or states, and to display scrolling error messages.

LIQUID

CRYSTAL

DISPLAY

OFFLINE STATUS LED

UP TO 4 STATUS LEDS FOR SET POINTS

PAGE UP DOWN ENTER

PROGRAMMING BUTTONS

Page 31

5 User Interface

Along with the LCD display, the front panel also incorporates five LEDs. The four outer LEDs (labelled 1,2,3 & 4) indicate the set point status, i.e. when the LED is illuminated the indicated relay is active. The centre LED indicates when the unit is “Off-Line”. Note: Not all relay channels may be fitted.

THE MENU SYSTEM

When the instrument is switched on, it will default to the main display menu. The user interface to the MOD53 is arranged as a menu structure, a summary of which is printed as a fold out sheet at the back of this guide. Movement around this menu structure is achieved using the “PAGE”, “UP” and “DOWN” keys at the bottom of the front panel. The functions within each menu are explained in detail in the following sections of this guide.

ERROR MESSAGES

If the internal diagnostics have detected an error condition, the appropriate error message will flash on the bottom row of the display. Pressing the “ENTER” key when an error message is flashing will scroll a more detailed description of the error along the bottom line. Pressing “ENTER” again will return the unit to the flashing display. The error messages can be disabled within the “Configuration” menu. If the error messages are disabled, the display will flash a bell symbol on the far right of the bottom row when an error is detected. It is possible to configure Relay 4 (if fitted) as an error relay to provide external indication of error conditions.

ACCESS ENTRY

To protect the instrument setup from unauthorised or accidental tampering, an access code must be entered. The “Access Entry” menu will appear when the “PAGE” key is first pressed from the main display menu. A character on the upper right of the display will indicate whether access is permitted. The character will be a key for permitted access and a padlock for denied access. By default the access code will appear as 0000, however to unlock the instrument the correct code will need to be entered.

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5 User Interface

Enter the access code as follows. { Note : “Outlined” text represents flashing

digits/characters on the display }.

0000

00000000

0000

Access Code ?

Press “ENTER” to begin editing the access code.

000

000000

000

Access Code ?

ØØØØ ××××

Use the “UP” and “DOWN” keys to change the first digit

000

0000

Access Code ?

Press “ENTER” to select the next digit

6 00

0000

Access Code ?

ØØØØ ××××

Use the “UP” and “DOWN” keys to change the second digit

6 00

0000

Access Code ?

Press “ENTER” to select the next digit

Continued on next page .......

Page 33

5 User Interface

6363

63 0

Access Code ?

ØØØØ ××××

Use the “UP” and “DOWN” keys to change the third digit

6363

63 0

Access Code ?

Press “ENTER” to select the next digit

637

637637

637

Access Code ?

ØØØØ ××××

Use the “UP” and “DOWN” keys to change the last digit

6363

637

Access Code ?

Press “ENTER” to store the new code

6375

63756375

6375

Access Code ?

If the new code is correct the Padlock symbol will now change to a Key symbol.

{ Note 6375 is only an example of an access code, the correct code will need to be entered to unlock the instrument.}

The default access codes are 0001 for level one and 0002 for level 2.

When the key symbol is displayed the operator may then move through the menu structure using the “PAGE”, “UP” and “DOWN” keys. Pressing the “PAGE” key will advance the unit on to the next menu header, using the “UP” and “DOWN” keys the operator can then select the items within that menu.

Page 34

5 User Interface

Pressing the “PAGE” key from within a menu will return the unit to the menu’s header, subsequent presses of the “PAGE” key will advance to the next menu. When the last menu is reached the unit will return to the normal display mode. Using the “PAGE” and “ENTER” keys simultaneously will allow the unit to move backwards through the menus.

N.B. When in the menu structure, if none of the buttons are pressed within 2 minutes, the unit will timeout and return to the main display. The Access Code display will be reset to 0000 30 seconds after returning to the main display.

There are two levels of access to the menu structure (refer to the menu structure printed inside the back cover). The first level allows access to the basic setup operations. The more complex level two menus will only appear when the level two access code has been entered. Once the access code has been entered correctly the operator can use the “UP” and “DOWN” keys to select and modify the access codes.

000

000000

0000

Access Code ?

Access Code Entry

ØØØØ ××××

0001

00010001

0001

Edit Level 1

Level 1 Code Edit. Press “ENTER” to edit.

(Available when level 1 code has been entered)

ØØØØ ××××

0002

00020002

0002

Edit Level 2

Level 2 Code Edit. Press “ENTER” to edit.

(Available when level 2 code has been entered)

ØØØØ ××××

Page 35

5 User Interface

UNIT CONFIGURATION

Editing of discrete values (such as Set Point Level or Fixed Temperature Input) is performed in the same way as described previously for the access code entry. Changing states (such as Units or Set Point Mode) is achieved in a similar fashion.

E.g. Using the “Units” menu function (in the “Parameters” menu). Press the “ENTER” key to start the text flashing. Press the “UP” and “DOWN” keys to cycle through the displayed states, then press “ENTER” to select the required state.

Units : %

Press “ENTER” to start the units flashing

Units :

ØØØØ ××××

Use the “UP” and “DOWN” keys to cycle through the flashing options

Units :

Press “ENTER” to select the flashing option

Units : ppm

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5 User Interface

For functions such as Calibration and Restoring Setup, press the ”ENTER” key to initiate the function, the system will then ask for confirmation. Press “ENTER” to continue or “UP” or ”DOWN” to cancel the function. e.g.

Restore Setup B

Select the required function and press the “ENTER” key.

Are You Sure ?

To continue press the “ENTER” key again

To abort the “Restore”, press any other key

Restoring

When the setup has been restored, the system will return to the main display.

The following sections of this guide describe in more detail each of the menus and their functions.

Page 37

5 User Interface

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Page 38

6 Main Display

The normal mode of operation is to display the sensor reading on the top row and a secondary reading on the bottom row. Using the “UP” and “DOWN” keys the user can cycle through the secondary parameters (those available depend upon the instrument options and configuration).

10.00

10.0010.00

10.00

ppm

Sat. : 100.0%

Sensor Concentration + Saturation

(When Display units are Concentration)

ØØØØ ××××

100.0

100.0100.0

100.0

Conc. : 15.53 ppm

Sensor Saturation + Concentration

(When Display units are Saturation)

ØØØØ ××××

Any combination of Sensor operating units can be displayed here in the same format as the two examples above, but are excluded here for brevity (a total of 20 combinations are possible). The main display will always be the units selected in the Parameters Menu (%Sat, ppm, mBar, mm Hg, nA/uA). The secondary display can be one of the remaining four units or as follows below.

ØØØØ ××××

60.0

60.0 60.0

60.0

SP1 : 10.0%

Sensor + Set Point 1

(When SP1 Trigger = High or Low)

ØØØØ ××××

60.0

60.0 60.0

60.0

SP1H : 4.00%

Sensor + Set Point 1 High

(When SP1 Trigger = Band or Latch)

ØØØØ ××××

Continued on next page .........

Page 39

6 Main Display

ØØØØ ××××

60.0

60.0 60.0

60.0

SP1L : 2.00%

Sensor + Set Point 1 Low

(When SP1 Trigger = Band or Latch)

ØØØØ ××××

Set Points 2 & 3 are displayed here in the same format as for Set Point 1 but are excluded here for brevity. A Set Point will not be displayed if has been configured to “Cleaning” operation

ØØØØ ××××

60.0

60.0 60.0

60.0

Temp : +72.5°C

Sensor + Temperature Input

(When Compensation = Auto)

ØØØØ ××××

60.0

60.0 60.0

60.0

Man IP : +25.0°C

Sensor + Fixed Temperature

(When Compensation = Manual)

ØØØØ ××××

60.0

60.0 60.0

60.0

Salin.: 12.3ppt

Sensor + Fixed Salinity Setting

ØØØØ ××××

60.0

60.0 60.0

60.0

Press. : 2.35Atm

Sensor + Pressure Input

(or fixed setting if compensation = Manual)

ØØØØ ××××

Continued on Next Page ……….

Page 40

6 Main Display

ØØØØ ××××

60.0

60.060.0

60.0

Output A : 12.76mA

Sensor + Current Output A (if fitted)

ØØØØ ××××

60.0

60.060.0

60.0

Output B : 12.76mA

Sensor + Current Output B (if fitted)

ØØØØ ××××

60.0

60.060.0

60.0

Zero Cal

Zero (0% Saturation) Calibration

(Available when access parameter set in “Calibration” menu).

ØØØØ ××××

60.0

60.060.0

60.0

Span Cal.

Span (100% Saturation) Calibration

(Available when access parameter is set in the “Calibration” menu).

ØØØØ ××××

1.00

1.00 1.00

1.00

Atm

Calib Pressure

When “Span Calibration” is complete the calibration pressure is displayed. (The Calibration Pressure can be set manually in the “Calibration” menu).

Selecting the parameter and pressing the “ENTER” key (provided that no error messages are present) will set the default secondary parameter. This is the default parameter that is displayed on the bottom line, when the unit is switched on, or as a result of returning to the normal display mode.

Page 41

6 Main Display

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Page 42

7 Parameters

The “Parameters” menu contains the basic configurations for the sensor inputs

Parameters

Parameters Menu Header

ØØØØ ××××

Units : % Sat

ppm pO2

mm Hg

Current

Display Units

ØØØØ ××××

Probe : Galvanic

Polargraphic

Sensor Type

ØØØØ ××××

Temp Units : °C

°F

Temperature Display Units

ØØØØ ××××

Continued on next page .........

Page 43

7 Parameters

ØØØØ ××××

TC Mode : Auto

Manual

Temperature Compensation Mode. Only present if temperature sensor (T Input) is enabled under “Configuration” menu page. (Otherwise defaults to “Manual”)

ØØØØ ××××

+25.0

+25.0 +25.0

+25.0

°C

Manual

Temperature input for manual compensation. Only present when temperature compensation is set to Manual.

ØØØØ ××××

19.0

19.019.0

19.0

ppt

Input Salinity

Salinity level set

ØØØØ ××××

P Comp : Manual

Auto

Pressure Compensation Mode :

Auto : From the active 4-20mA input

Manual : From user set Pressure Level

ØØØØ ××××

Continued on next page .........

Page 44

7 Parameters

P Units: Atm

Bar

kPa

m H2O

mm Hg

Pressure Display Units. Available when the pressure compensation is set to “Manual”

ØØØØ ××××

1.0

1.01.0

1.0

Bar

Input Pressure

Fixed pressure level when compensation is manual

ØØØØ ××××

Simulate Input

Press “ENTER” to Select the Input Simulation Mode

1.0

1.01.0

1.0

ppm

Simulate : 12.00mA

Simulate sensor input. Use the “Up” and “Down” keys to scan through the input range to test the Set Point Relays and Current Outputs

UNITS

The MOD53 primary display can be setup to display in % (saturation), ppm (concentration), pO2 (partial pressure of Oxygen) or input current. This is achieved by simply setting the appropriate units. The relationship between these three parameters is determined by several factors including temperature, pressure and the salinity of the solution being measured. (See Appendix A).

Page 45

7 Parameters

SENSOR TYPE

The MOD53 can scale its input readings to operate with either a Galvanic (Mackereth) or Polargraphic (Clark) sensor. This enables the instrument to be used with a variety of different manufacturers’ sensors. Both types of sensor provide a current output, but Polargraphic sensors require a polarising voltage to be applied across the Anode and Cathode. Other parameters will need to be set such as the bias voltage, membrane correction and temperature sensor type. These settings will need to be obtained from the manufacturer of the sensor

TEMPERATURE INPUT

Temperature has a significant effect on the output from the sensor, and it is therefore necessary to compensate for the variations in the liquid and the sensor. The MOD53 provides the facility to measure and automatically compensate for these temperature variations, or alternatively, if no temperature sensing is available, the user can select manually the temperature at which the unit compensates. It is recommended that unless a stable measurement temperature is achievable, the automatic compensation be used.

The operator can apply automatic or manual temperature compensation to the dissolved oxygen measurement by selecting the mode of operation in the “T. Comp.” menu item within the “Parameters” menu. For automatic compensation, the correct temperature sensor must be selected in the Configuration menu. When the manual mode of operation is selected the user can enter the fixed process temperature under the Fixed Temp. Menu. { Note. When the automatic mode is selected the Fixed Temp. menu will not be present }.

NOTE : If a Temperature sensor fault is detected, the unit defaults to the “Fixed Temp” setting for compensation purposes, and displays an error condition.

The operator can choose to display all temperatures in °C or °F by modifying the “T. Units” parameter. All temperature related displays will use the units selected in this menu. N.B. The system will normally convert all temperature related variables when the units are changed, however it may be wise for the operator to ensure that changing the units has not altered the set points or current outputs.

SALINITY

The salinity of the solution has a significant effect when converting % Saturation to concentration. The user can compensate for this by setting the “Input Salinity” parameter to the correct level. (Entered in ppt, parts per thousand).

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7 Parameters

PRESSURE COMPENSATION

The MOD53 can accept a 4-20 mA input from a pressure transmitter to permit automatic compensation for variations in the pressure. If it is available, set the “P Comp” parameter to “Auto”. If not, set the “P Comp” parameter to “Manual” and set the measurement pressure at the “Input Pressure” parameter. The units for pressure display can be set to either “Bar”, “Atm”, “psi”, “kPa”, “m H

O” or “mm

Hg” at the “P Units” parameter. Variations of pressure can have a significant on

the sensor output..

SIMULATED INPUT

The facility exists within the MOD53 to simulate the input sensor levels to test the set point and current output operation. This function allows the user to cycle up and down through the sensor range using the “UP” and “DOWN” keys and display the current output level, with the relays responding accordingly.

To select the Simulate menu item from the Parameters menu, press the “ENTER” key. The unit will now display the simulation menu. Pressing the “UP” and “DOWN” keys will cycle the displayed value between its minimum and maximum levels in steps of 1%. The relays and current output will respond as if the displayed value were an actual input, thus allowing the user to debug the set point and current output configurations.

Page 47

7 Parameters

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Page 48

8 Set Points

The Set Point configuration is separated into two menus, the first “Set Points 1&2” and the second “Set Points 3&4” (if fitted). The menu structures for Set points 1,2 & 3 are identical, and provide a high level of flexibility in the configuration of the relay outputs.

Set Points 1&2

Set Points

Menu Header

ØØØØ ××××

SP1 : Disabled

Sensor IP

Temp IP

Cleaning

Set Point Source Control. When cleaning is selected the following menu items will be replaced by the ”Cleaning” menus

ØØØØ ××××

SP1 Trig : High

Low

Band

Latch

Set Point Trigger

ØØØØ ××××

4.00

4.00 4.00

4.00

Set Point 1

Set Point Level

(When trigger is “High” or “Low”)

ØØØØ ××××

Continued on next page ……..

Page 49

8 Set Points

ØØØØ ××××

SP1 Mode : On/Off

PP TP

Set Point Mode. This menu will not appear if Trigger is set to “Latch” or “Band”. The mode will default to “On/Off” in this state

ØØØØ ××××

SP1 Dose Alarm? Y

Set Point 1 Dose Alarm Timer Enable.

ØØØØ ××××

00:30

00:3000:30

00:30

: ss

SP1 Alarm Time

Set Point 1 Dose Alarm Time

(Only visible when Timer Enable = Y)

ØØØØ ××××

00:30

00:3000:30

00:30

: ss

SP1 Delay

Set Point Delay (to energising)

(Only appears if mode = On/Off)

ØØØØ ××××

5.0

5.05.0

5.0

SP1 Hysteresis

Set Point Hysteresis

(Only appears if mode = On/Off)

ØØØØ ××××

Continued on next page ……..

Page 50

8 Set Points

ØØØØ ××××

00:30

00:3000:30

00:30

: ss

SP1 Cycle Time

Set Point Cycle time for PP mode

(Only appears if mode is PP)

ØØØØ ××××

5.0

5.0 5.0

5.0

SP1 Prop Band

Set point proportional band as % of range

(Only appears if mode = PP or TP)

ØØØØ ××××

{ Note. The Set Point 2 menus continue from here, and are structured in the same manner.}

SET POINT SOURCE

The set point operation on the MOD53 can be configured to operate from one of three sources. The default source is the main sensor input reading, but the set point can also trigger from the temperature input or be used to switch a cleaning device for timed washing of the sensor. The menu structure for configuring the set points is basically the same for the sensor and temperature inputs. For cleaning operation, the menu items are replaced by the cleaning menu.

SET POINT TRIGGER

The set points can be configured to trigger in four ways. The level where the set point triggers is set by editing the value under the “Set Point 1” menu item in the “Set Points” menu. When the trigger is set to Band or Latch the “Set Point 1” menu disappears and “SP1 Band High” and “SP1 Band Low” menu items become available.

1. When the Trigger is set to “High”, the relay will be activated when the source input becomes greater than the set point.

2. When the trigger is set to “Low”, the relay will become activated when the source input is less than the set point.

3. When the trigger is set to “Band” the relay will become activated when the source input is either greater than the “Band High” level, or lower than the “Band Low” level.

Page 51

8 Set Points

4. When the trigger is set to “Latch” the relay will become activated when the source input becomes lower than the “Band Low” level, and will remain energised until it becomes higher than “Band High” level. It will then remain de-energised until the sensor input falls below the “Band Low” level again.

SET POINT MODE

The relays can operate in one of three modes.

On/Off Mode

The On/Off mode is the default mode of operation for the relays. The relay energises when the set point is activated and is de-energised when the set point is de-activated.

“Delay”: In order to prevent, short duration changes at the input affecting the relay operation a delay can be set before the relay is energised. If the input is still the same after the delay, then the relay will be energised.

“Hysteresis”: A facility to apply hysteresis to the set point level allows the user to avoid relay “Chatter” when the sensor input level approaches the set point level. “Chatter” is caused when the sensor input is sufficiently close to the set point value that noise on the signal repeatedly crosses the set point level, thus causing the relay to switch on and off rapidly.

The hysteresis level should therefore be set to be a little larger than the input noise level.

Time Proportional Mode

The MOD53 provides two forms of pseudo proportional control, which can be used to control the levels to a defined value when used in conjunction with a pump or valve. When the reading deviates from the programmed set point level the relay pulses at a rate proportional to that deviation. It is possible to control any on/off device such as a solenoid valve or dosing pump using the time proportional mode.

The proportional band is displayed as a percentage of the full range value. For example, a proportional band of 20% on the dissolved oxygen range of 0-30 ppm would give a band of 6 ppm. If the set point trigger was selected as LOW and the set point value was 10 ppm, the band would cover 4 to 10 ppm. When the reading falls below 4 ppm the relay would be energised. As the input rises and approaches the set point the output relay starts to cycle on and off with the on time reducing and the off time increasing, respectively. The cycle time is adjustable and is the sum of the on and off times.

Pulse Proportional Mode

The Pulse Proportional (or PP) mode is intended to drive solenoid type dosing pumps which have the facility to accept an external pulse input. The proportional band operates in the same way as the Time Proportional mode.

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8 Set Points

The output relay now operates by producing a series of pulses of fixed duration. The pulse rate increases as the measurement moves further from the set point, until it reaches the maximum frequency at the limit of the proportional band. (i.e. 4 ppm in the previous example).

DOSE ALARM TIMERS

The dose alarm timer can be used to prevent overdosing under many different fault conditions , such as sensor failure or wiring faults. When the timer is enabled the user can set the “Alarm Time”. If the associated relay remains energised for longer than the “Alarm Time” the alarm will activate, de-energising the relay to prevent over-dosing and flash the relative set point LED on the front panel. The display will also flash a warning message when the alarm is activated. NB During pulse or time proportional operation the cumulative “on” time that the set point is active will be taken.

To cancel the warning, and reactivate the set point, the user need only press the “ENTER” button on the front panel. NB. If more than one Alarm is active, set point 1 takes priority over set point 2 which takes priority over set point 3, and they are cancelled in that order by additional presses of the “ENTER” button.

Set Point 4 can be set to activate when a Dose Alarm is detected.

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8 Set Points

SET POINT 4

Set Point 4 can be configured as an alarm output triggered by one of a number of events. This can be configured by editing the SP4 trigger, which can be found after the Set Point 3 configuration in the “Set Points 3&4” menu.

Set Points 3&4

Set Points 3 & 4 Menu Header

ØØØØ××××

The Set Point 3 menu continues from here and is structured in the same manner as for Set Points 1 and 2.

ØØØØ××××

Relay 4 will energise only when the selected state occurs, and de-energise when that state clears.

SP4: Disabled

Sensor

- When a sensor related error is detected

Dose

- When any of the Dose Alarms activates

Calibration

- When a calibration is in progress

Off-Line

- When the unit is taken “Off-Line”

Any Error

- When any system error is detected.

ØØØØ××××

Page 54

9 Current Output

The current output menu structure contains all of the necessary setup functions to configure the current output source(s). If one current output is fitted then the menu will be as follows. If two current outputs are fitted they are referred to as A and B respectively. When either of the outputs is open circuit, in a dual output unit,

the other will indicate a fault by transmitting a 2mA signal. This will be accompanied by a flashing error message on the Display (E41).

Current Output

Current Output Menu

ØØØØ××××

Sensor IP

Temp IP Cleaning

If “Cleaning” is selected the following menus will be replaced by the Cleaning menus.

ØØØØ××××

4----20

2020

Select Output

Current output type

(0 - 20mA or 4 - 20 mA)

ØØØØ××××

0.00

0.000.00

0.00

ppm

Current O/P Zero

Zero current (0/4mA) sensor input level

ØØØØ××××

Continued on next page …….

Page 55

9 Current Output

ØØØØ ××××

20.0

20.0 20.0

20.0

ppm

Current O/P Span

Span current (20mA) sensor input level

ØØØØ ××××

On Error = No

22mA

0mA

Select state of current output when input source error is detected (i.e. Sensor Input Fault, Temperature input Over range)

INPUT

The input for the current output can be one of three options. The unit can use the sensor input or the temperature input as the source for the zero and span. Alternatively the output can be used to drive a cleaning system (see “Cleaning”). When the cleaning option is selected, the span and zero menus disappear and are replaced by the cleaning option menus.

OUTPUT RANGE

The output range for the current output can be set to one of two ranges, either 0 20mA or 4-20mA. This selection sets the limits of the zero and span output levels. The output will continue to provide an extrapolated output above (>20mA) and below (<4mA) these points but will flag an error message on the main display. The maximum current limit is approximately 22mA, the minimum limit is 0mA (i.e. the unit cannot source a negative current)

ZERO & SPAN

The zero and span levels are set as the limits of the source input. This provides a totally flexible method of configuring the current output. The zero can be set anywhere within the input source range and the span up to 5% of the selected range, providing total control of the output range and offset. An inverse relationship can easily be achieved by simply setting the zero level to be higher than the span level.

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9 Current Output

DUAL CURRENT OUTPUTS

If the instrument is supplied with two current outputs they are designated A & B respectively. The menu for current output B is identical to A and is displayed after the A menu.

PROPORTIONAL CONTROL

Many devices such as motor speed controllers, valve actuators, or stroke positioners will accept an analogue 4-20 mA control signal.

It is possible to use the measurement signal from the instrument as a control signal. By setting the point at which the output is 4 mA as the set point (e.g. 7.00 ppm) and the point at which the output is 20 mA as the proportional band (e.g. 4.00 ppm) a simple form of proportional control is achieved. If this signal was used to drive a valve actuator, the valve would be fully open at 4.00 ppm; half open at 5.50 ppm and closed at 7.00 ppm.

ERROR CONDITION

The current outputs can be programmed to output 22mA or 0mA when an error is detected on the source (i.e. Sensor Fault, Temperature Over or Under Range), to provide remote warning of error conditions or to ensure fail safe operation. The default state of is disabled, where the parameter is set to ”No”.

Page 57

9 Current Output

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Page 58

10 Calibration

The MOD53 provides the facility within the “Calibration” menu to adjust the sensor inputs and current output levels to tailor the unit to the system in which it is operating.

Calibration

Calibration Menu Header

ØØØØ ××××

Mode : On-Line

Off-Line

When “Off-Line” the relays are deenergised and the current outputs held. The “Off-Line” LED on the front panel will illuminate

ØØØØ ××××

Cal Access ? Y

Setting this to “Y” enables the sensor calibration menu items on the main display

ØØØØ ××××

Cal.Units: % Sat

ppm

mm Hg

The instrument can be calibrated in any of the measurement units shown here. An allowance should be made for temperature variation when calculating the calibration level. If the operating units are changed in the Parameters Menu, the Cal. Units are automatically changed to the same units. They can be changed to other units here as required.

ØØØØ ××××

Continued on next page ……..

Page 59

10 Calibration

2.00

2.00 2.00

2.00

Atm

Enter Pressure

Enter the sensor pressure at calibration

ØØØØ ××××

Sensor Zero

Sensor Zero (0% Saturation) Calibration.

ØØØØ ××××

100.0

100.0100.0

100.0

Set Span Cal Pt.

Set Span Calibration Level (0 - 100%) in whichever calibration units have been selected.

ØØØØ ××××

Sensor Span

Sensor Span Calibration.

ØØØØ ××××

AutoCal N

Enable Automatic Span Calibration

ØØØØ ××××

Temperature

Temperature offset calibration

(Only present if “T. Comp.” Is “Auto”)

ØØØØ ××××

Continued on Next Page ……..

Page 60

10 Calibration

Pressure Input

4-20mA Pressure Input Calibration

(Only present if “Pressure Comp.” is set to “Auto” in the Parameters Menu)

ØØØØ ××××

Current Output

Current Output Calibration

(User adjustment of 0,4 & 20mA output levels)

ØØØØ ××××

Reset User Cal

Reset all of the calibrations to the factory default settings.

ØØØØ ××××

ON-LINE/OFF-LINE OPERATION

Selecting the “Mode” menu allows the user to put the unit in the ”Off-Line” state. If the state is “Off-Line” the relays are de-energised and the current output is held for the duration of the “Off-Line” state. When “On-Line” is selected the relays and current output operate normally. The middle LED on the front panel indicates when the unit is “Off-Line”. In addition the user can set the unit to “Off-Line” by using the digital input terminal.

CALIBRATION ACCESS

A feature has been included to allow users to access the sensor calibration from the main display. To enable this feature the “Cal Access?” state should be set to “Y”. To disable this feature, preventing users from altering the calibration from the main display, the “Cal Access?” state should be set to “N”.

AUTOMATIC CALIBRATION

Span calibration can be initiated by an external digital input if the “Autocal Enable?” function is set to “Y”. When the input is shorted to the common input

the unit will calibrate the span to the set level.

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10 Calibration

SENSOR CALIBRATION

Sensor Zero

Sensor Zero Calibration

(Place sensor in 0% saturated solution)

Press to begin calibration

Are You Sure?

The instrument will ask for confirmation

Press to Confirm, any of the other 3 buttons will

abandon the sensor calibratio

Sampling

Unit measures input current that equates to the 0% Saturation input level.

Sensor Span

Sensor Span Calibration

(Place sensor in saturated solution)

Press to begin calibration

Are You Sure?

The instrument will ask for confirmation

Press to Confirm, any of the other 3 buttons will abandon the sensor calibration.

Sampling

The unit will measures the input current that equates to the 100% saturation level, and will record the Temperature at that point (the fixed value will be taken if the compensation mode is “Manual”)

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10 Calibration

TEMPERATURE CALIBRATION

To initiate the temperature calibration select the “Temperature“ menu item in the “Calibration” menu and press the “ENTER” key.

Temperature

Temperature offset calibration

(Only present if Compensation is Automatic)

Are You Sure?

The instrument will ask for confirmation

Press to confirm, any of the other 3 buttons abandons the temperature calibration.

25.0

25.025.0

25.0

°C

The Temperature reading is now displayed.

Whilst the display flashes

ØØØØ××××

Adjust the reading using the up/down buttons

25.2

25.225.2

25.2

°C

Adjusted Reading

Press to accept the calibrated value when ready.

Offset = +0.2°C

For user information, the unit will display the offset adjustment

Page 63

10 Calibration

PRESSURE INPUT CALIBRATION

Pressure Input

Pressure Input Calibration

Press to begin calibration

Are You Sure?

The instrument will ask for confirmation

Press to Confirm, any of the other 3 buttons will abandon the sensor calibration.

Set Input to 4mA

Set the pressure transmitter output to 4mA.

Press “ENTER” to start

Sampling

The unit will sample the 4mA input current.

When complete the display will move on to the 20mA calibration

Set Input to 20mA

Set the pressure transmitter output to 20mA

Press “ENTER” to start

Sampling

The unit will sample the 20mA input current.

Page 64

10 Calibration

CURRENT OUTPUT CALIBRATION

The user is provided with an opportunity to adjust the current output, to calibrate any equipment that may be being used to monitor the current output signal. To adjust the current output select the “Current Output” menu item in the “Calibration” menu. Please keep in mind that the current output cannot go below 0mA. The maximum offset is ±2mA. If two current outputs are fitted they are referred to as A and B respectively.

Current Output

Current Output Calibration

(0,4 & 20mA levels)

Press to start calibration

Are You Sure?

The unit will request confirmation before beginning the calibration

Press to confirm, any of the other 3 buttons abandons the temperature calibration.

Adjust 0mA

Use the Ø and × keys to adjust the output to give 0.00mA at the output monitor.

Press “ENTER” to finish.

Adjust 4mA

Use the Ø and × keys to adjust the output to give 4.00mA at the output monitor.

Press “ENTER” to finish.

Adjust 20mA

Use the Ø and × keys to adjust the output to give 20.00mA at the output monitor.

Press “ENTER” to finish.

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10 Calibration

RESETTING THE USER CALIBRATION

If required the user can reset all of the user calibrations to their default states by selecting the “Reset User Cal.” menu item .

Reset User Cal

Reset all User calibrations to default states

Press “ENTER” to initiate reset

Are You Sure?

The unit will ask for confirmation before resetting the user calibrations.

Press “ENTER” to confirm

Resetting

The display will appear as shown whilst the unit is resetting the calibrations. It will return to the top of the Calibration menu when complete

Page 66

11 Save & Restore

One of the many new features in the MXD53 series of instruments is the availability to the user of a setup storage and recovery facility. Using these functions the user can save an instrument setup into either of two stores, or restore a previously saved setup from one of the two stores or two default setups.

Save / Restore

Save /Restore Menu Header

ØØØØ ××××

Save As Setup A

Save current instrument setup to store A

ØØØØ ××××

Save As Setup B

Save current instrument setup to store B

ØØØØ ××××

Restore Setup A

Restore instrument to setup in store A

ØØØØ ××××

Restore Setup B

Restore instrument to setup in store B

ØØØØ ××××

Continued on the next page ......

Page 67

11 Save & Restore

ØØØØ ××××

Default Galvanic

Set instrument to default for Galvanic Probe operation.

ØØØØ ××××

Default Polargraphic

Set instrument to default for Polargraphic Probe operation.

ØØØØ ××××

To use these functions select the “Save/Restore” menu item and use the ”UP” and “DOWN” keys to select the required function. Pressing the “ENTER” key will prompt the unit to ask for confirmation. Pressing the “ENTER” key again will initiate the function. The unit will then perform the function and then return to the main menu.

This facility is very useful when testing or fault finding is required. The setup can be stored prior to testing and restored once testing is complete. The two default setups are provided to give a basic instrument setup for each of the Polargraphic and Galvanic probe configurations.

Note. There is no protection for the setup stores other than the systems request for confirmation, so be very careful not to overwrite already saved setups.

Page 68

12 Pressure Input

When the “P Comp” parameter in the “Parameters” menu is set to “Auto” this menu will become available.

Pressure

Pressure menu header

ØØØØ ××××

Mod Input

24V Loop

The MOD53 has the ability to support both direct 4-20mA input and 24V loop powered systems by setting this parameter. NB A “User Calibration” is essential in the 24V loop mode.

ØØØØ ××××

Units : Atm

Bar kPa

m H

mm Hg

The display of pressure units can be set to any one of six common standards.

ØØØØ ××××

1.00

1.001.00

1.00

Atm

Set 4mA Input

Set the 4mA input pressure level

ØØØØ ××××

Continued on next page ..........

Page 69

12 Pressure Input

ØØØØ ××××

2.00

2.002.00

2.00

Atm

Set 20mA Input

Set the 20mA input pressure level

ØØØØ ××××

Dampin Disabled

Enabled

Select whether “Pressure Damping” is active

ØØØØ ××××

1.00

1.001.00

1.00

Atm

Pressure Limit A

Enter “From” limit. Damping is applied when input pressure presents a step change from Limit A to Limit B

ØØØØ ××××

3.50

3.503.50

3.50

Atm

Pressure Limit B

Enter “To” Limit.

ØØØØ ××××

Input Mode

The MOD53 is designed to accept either direct 4-20mA input, or to interface to a 24V loop powered transmitter. Care should be taken when connecting the unit to ensure that the cable resistance is not too great, which will lead to too great a voltage drop over length of the cable.

For the direct input configuration the input resistance is 100Ω. The necessary supply voltage will depend on whether there any other monitors in the loop. The maximum required will be = 22mA X Total In-Line resistance (including the cable resistance).

Page 70

12 Pressure Input

Pressure Damping

The facility has been provided to allow the user the dampen the effect of rapid changes in pressure that might lead the unit to activate the set point relays before the sensor has had a chance to react to the change in pressure (which would give a false reading). When activated the unit will hold the sensor readings and flash a “Pressure Damping” message on the display for 20 seconds. After twenty seconds expires the unit will update the sensor readings, compensated to whatever level the pressure input has settled to having allowed the sensor to “catch up”. If the pressure input returns to the level it was at prior to damping being applied, then the damping will be cancelled, whether the twenty seconds has expired or not. The user may also cancel the pressure damping by pressing the “ENTER” key when the “Pressure Damping” message is flashing on the display.

To use this facility simply set the “Damping” item in the “Pressure Input” menu to “Enabled”. The limits A (“From”) and B (“To”) can be tailored by the user to provide the necessary response. For example :

(i) If Limit A (“From”) is set to 1.00Atm and Limit B (“To”) is set to 2.5 Atm, then

when the input pressure rises from an input below 1.00Atm to one greater than 2.5Atm, pressure damping will be applied

(ii) If Limit A (“From”) is set to 2.3Atm and Limit B (“To”) is set to 1.2Atm, then

when the input pressure falls from an input above 2.3Atm to one less than

1.2Atm, pressure damping will be applied.

Page 71

12 Pressure Input

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Page 72

13 Configuration

The units also includes a configuration menu which sets up some basic operating parameters for the instrument

Configuration

Configuration menu header

ØØØØ ××××

Lan : English

The MOD53 has the ability to support multilingual text messaging, this can be selected from this menu.

Francais Espanol

ØØØØ ××××

T Input : Disabled

The temperature sensing input can be configured to accept a variety of resistive sensing elements

PT1000 PT100 LTH 1K

1K Thermistor used in OE15

BJ 22K

22K Thermistor used in ProcessProbeTM

ØØØØ ××××

+0.675

+0.675+0.675

+0.675

Bias Voltage

For Polargraphic probes, the Bias Voltage can be set at this menu parameter.

ØØØØ ××××

Continued on next page ..........

Page 73

13 Configuration

ØØØØ ××××

2500

25002500

2500

Membrane Correction

The Membrane Correction Factor can be set at this menu parameter.

ØØØØ ××××

Errors : Enabled

Disabled

This function will disable/enable the flashing error messages on the main display. When disabled, a flashing “Bell” character will indicate an error is present.

ØØØØ ××××

IP Filter : Out

Input Filtering.

10 Secs 20 Secs 40 Secs 1 Min 3 Mins 5 Mins

ØØØØ ××××

Input Filtering (Averaging)

When very noisy environments are encountered, this function will allow the user to filter the sensor readings by taking a running average over the time period selected. (From 10 seconds to 5 minutes).

Page 74

14 Sensor Cleaning

The set points or current output can be configured to operate a jet spray wash or rotary electrode cleaning system on a timed cycle. Its purpose is to prevent accumulation of particulate matter on the active surfaces of the sensor. The cleaning control menus can be accessed form either of the Set Point or Current Output menus, when one or other has been set to cleaning mode.

ØØØØ ××××

00:30

00:3000:30

00:30

:ss

Cleaning Duration

The duration of the cleaning operation (5 seconds to 10 minutes)

ØØØØ ××××

01:30

01:3001:30

01:30

hh:

Cleaning Interval

The interval between cleaning operations (5 minutes to 48 hours)

ØØØØ ××××

Clean : On-Line

Off-Line

System state when cleaning. When “Off-Line”, the other relays/current outputs are disabled

ØØØØ ××××

00:05

00:0500:05

00:05

mm:

Cleaning Recovery

Sensor recovery, time from end of cleaning to returning to “OnLine” state” (5 seconds to 10 minutes)

ØØØØ ××××

Continued on next page ……

Page 75

14 Sensor Cleaning

Cleaning Delay Y

When operating in “On-Line” state, “Y” forces the cleaning to wait until all relays are inactive.

(Only appears when state = “On-Line”)

Manually taking the instrument Off-Line will prohibit or terminate a “Clean” cycle. If the instrument is Off-Line when a “Clean” cycle is requested, either automatically or manually, the message “Cleaning Delayed” will flash on the bottom row of the display until it is either cancelled using the “ENTER” key, or cleaning is initiated by placing the unit back in the On-Line state. The instrument can be taken Off-Line during a “Clean” cycle. This will de-energise the set point relays and freeze the current output which could otherwise cause chaos in the control system as a result of cleaning solution being sprayed onto the sensor.

By selecting the automatic Off-Line facility in the menu, spurious relay / current output changes are prevented during the Duration and Recover periods. Normal operation is restored during the Interval period. The clean Delay function gives priority to the control relays. This means that a “Clean” cycle will be delayed for as long as necessary until the control relays are in the “Off” state.

A manual clean cycle can be initiated by a remote switch/contacts connected to the instrument digital input terminals. The “Clean” cycle software runs automatically and continuously from power up if selected, beginning with the Interval period. It can only be stopped by changing the operating mode of the output which it is controlling.

Typical Operation with Clean Offline

Duration

Clean Relay

Set point

Relay

Current

Output

Offline

Lamp

Recovery Interval

off

offon

Hold

Normal

Page 76

15 Fault Finding

NOTE : THERE ARE NO USER SERVICEABLE PARTS INSIDE THE UNIT

The MOD53 has been designed to include a wide range of self diagnostic test, some of which are performed at switch on, and some on a continuous basis. This guide aims to provide a route to diagnosing and correcting any faults that may occur during normal operation. The table shown, gives a list of the error messages that the MOD53 generates, along with their probable causes. If the fault has not been cleared after these checks have been made contact LTH. Please have as much of the following information available as possible in any communication with LTH, to enable quick diagnosis and correction of the problem.

1. Serial number of the instrument,

2. The approximate date of purchase.

3. Software Version (Displayed at Switch On)

4. Details of the program settings and application

5. Electrical environment and supply details

6. Circumstances under which the fault occurred.

7. The nature of the fault or faults

8. Any error messages that are displayed

9. The sensor type, cable length and type

10. Current output configuration

11. Relay connection configuration

It is often worthwhile to check the measurement by an independent method, for example using a handheld meter. See also Noise Suppression.

The Instrument Appears Dead

Check that power is available to the unit . Use an appropriate voltmeter to check that the power supply voltage at the connector is within the limits defined on the connector label. Check that the power cable is securely and correctly attached. There are no user serviceable fuses fitted within this unit.

The Access Code Does Not Work

It is probable that the access code has either been changed or the operator does not recall the code correctly. Contact LTH or your local distributor should this problem arise.

The Sensor Reading Is Constantly Over-range or Under-range

♦

Ensure that the sensor and temperature inputs are correctly connected, and check that the sensor is not faulty or damaged.

♦

Check that the correct probe type has been selected ensure all probe protective caps have been removed.

♦

Check that any junction boxes used are correctly connected.

♦

Check for damaged or broken cables.

Page 77

15 Fault Finding

♦

Where extension cables have been used, try connecting the sensor directly to the instrument.

♦

Check the sensor using a hand held meter.

The Sensor Reading Is Incorrect

♦

Check the temperature compensation mode. If the compensation is set to “Manual” check that the fixed temperature is at the correct level. If the compensation is “Automatic” check that the temperature reading on the main display is correct.

♦

Use another instrument to check the sensor.

♦

Check that the sensor gives sensible readings in air (100%) and Sodium Sulphite Solution (0%)

♦

Check the Pressure and Salinity Compensation values

♦

Check that no error messages are being displayed.

The Temperature Reading Is Incorrect

♦ Check that the temperature sensor is correctly attached. ♦ Check that the temperature sensor type is correctly selected in the

“Configuration” menu.

♦

Where practical check the temperature sensor resistance against the table in Appendix F.

♦

Check the user calibration.

Current Output is Incorrect or Noisy

♦

Check that the maximum load for the current loop has not been exceeded. (1000Ω)

♦

Check that the terminals have been wired correctly .

♦

Check that the cable screen is attached to Earth at one end, and that the cable does not pass too close to a power cable. Check that the current output has been configured properly.

♦

Check the user calibration.

Pressure Input is Incorrect or Noisy

♦

Check that the maximum load for the current loop has not been exceeded.

♦

Check that the terminals have been wired correctly and that the cable screen is attached to Earth at one end. Make sure that the cable does not pass too close to a power cable.

♦

Check that the Pressure Input has been configured properly. Try performing a user calibration.

Page 78

15 Fault Finding

Relays Appear to Malfunction

♦

Check that the unit is “On-Line”

♦

Check that the set point configuration is correct

♦

If the relays are vibrating or “chattering” as they pass the set point, check the hysteresis setting and increase if necessary.

♦

Ensure that the relays are connected properly and that the voltage/current levels are not exceeding the specification

♦

Check that the instrument input cables are not picking up excessive noise,

A Bell Symbol is Flashing on the Display

The system has detected an error but the error messages have been disabled in the “Configuration” menu. Enable the error messages, correct the error and then disable the error messages only if absolutely necessary.

OE15 DO Probe Maintenance

In order to achieve the maximum reliability from the overall system the sensor will require regular calibration and maintenance. The period for this will depend upon the application; e.g. in aeration tanks, a weekly check on calibration and fouling would be a reasonable estimate, for rivers a longer period, and in ditches it may need to be more frequent. The zero check in Sodium Sulphite would be less frequent, probably once a month.

The OE15 electrode incorporates a number of features to simplify maintenance. The electrolyte contained within the cartridge is gelled and sealed. The cartridge is detachable. It can be removed by undoing the large stainless steel bolt at the bottom of the electrode.

Due to the Galvanic action of the sensor, the cartridge has a finite life. It will provide at least 12 months of continuous use before replacement becomes necessary. LTH Electronics operates an exchange service for electrodes, but we recommend the purchase of a spare cartridge if the process being monitored is continuous. The electrode should contain a weak solution of Sodium Sulphite, which absorbs any residual oxygen in the probe and conditions the electrode for immediate use.

Page 79

15 Fault Finding

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Page 80

16 OE15 Membrane Replacement

The electrode membrane is very delicate and may be damaged by careless use. Inspect the electrode periodically for signs of membrane damage and replace it if necessary.

Remove the damaged membrane and the two ’O’ rings retaining it and set these aside. Cut a 120mm length of membrane and fit to the applicator as shown by passing it through the middle and evenly stretching the front edge back over the outside. Slide the applicator carefully over the electrode taking care not to stretch the membrane. Release the membrane at the top and withdraw the applicator.

Page 81

16 OE15 Membrane Replacement

Place the two ‘O’ rings on the applicator and slide this over the electrode taking care not to touch the membrane covering the silver cathode. Push off the first ‘O’ ring to locate in the top groove without stressing the membrane. Fit the second ‘O’ ring in a similar fashion and trim off the excess membrane not enclosed within the ‘O’ rings.

Page 82

17 Guarantee and Service

Products manufactured by LTH Electronics Ltd are guaranteed against faulty workmanship and materials for a period of three years from the date of despatch, except for finished goods not of LTH manufacture, which are subject to a separate agreement.

All sensors made by LTH Electronics Ltd are thoroughly tested to their published specification before despatch. As LTH have no control over the conditions in which their sensors are used, no further guarantee is given, although any complaints concerning their operation will be carefully investigated.

Goods for attention under guarantee (unless otherwise agreed) must be returned to the factory carriage paid and, if accepted for free repair, will be returned to the customer’s address free of charge. Arrangements can also be made for repair on site, in which case a charge may be made for the engineer’s time and expenses.

If any services other than those covered by the guarantee are required, please contact LTH direct.

N.B. Overseas users should contact their LTH nominated representative. Special arrangements will be made in individual cases for goods returned from overseas.

Page 83

17 Guarantee and Service

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Page 84

Appendix A – DO Measurement

Sensor Interface

The output signal from a Dissolved Oxygen probe is in the form of a constant DC current which is proportional to the partial pressure of the liquid being measured. In a 100% saturated solution at room temperature and pressure, the output from a Galvanic probe will be of the order of hundreds of micro-amps (10

-6

Amps), whereas the output from a Polargraphic probe will be of the order of hundreds of nano-amps (10

-9

Amps).

In addition, Polargraphic probes require a bias voltage to be applied between the cathode an anode of the DO cell to excite an output.

The equation for converting current input to % saturation is as follows :

% Saturation = (I/Io) x Pc x M x 100

Where : I = Measured Input Current I

= 100% Saturation Current

= Pressure Correction Term

M = Membrane Correction Term

The pressure correction term compensates for the effect that pressure has on the solubility of oxygen in water. This is almost directly proportional, i.e. a 10% variation in pressure will lead to a 10% variation in the solubility and therefore saturation of the liquid.

The pressure correction term is defined as follows :

- P

vapor(To)

= -------------------

P - P

vapor(T)

Where : Po = Pressure at 100% Calibration P

vapor(T

= Saturation Vapour Pressure at T P = Pressure T = Temperature To = Temperature at 100% Calibration

Page 85

Appendix A – DO Measurement

Membrane Correction

The membrane correction term is defined as follows :

M = e

A([1/T]-[1/To])

Where : A = Membrane Correction Factor T = Temperature (in °K) To = Temperature at calibration (in °K)

The membrane correction factor is specific to each make of probe and characterises the type and thickness of the membrane material in terms of how its permeability to Oxygen varies with temperature. From this, it can be seen that the membrane correction term can contribute a variation in the saturation value of as much as 3% for each degree of change in temperature (for a typical membrane correction factor of 2220).

The above equations demonstrate the benefits of having active temperature and pressure measurement when an accurate reading is required. For systems where active pressure or temperature measurement is not available, manual compensation is available.

Oxygen Solubility

The Oxygen solubility is easily defined as : % Saturation X Maximum Theoretical Solubility of Oxygen in water. The maximum theoretical solubility is heavily dependant on the temperature, pressure and salinity of the measured liquid. Tables of data for Oxygen solubility are readily available from a number of sources such as BS EN 25814, ISO5814 , and see solubility table.

Partial Pressure of Oxygen (pO2)

The concentration of a gas dissolved in a solution at equilibrium is proportional to the partial pressure of the gas in contact with the solution (Henry’s Law). The partial pressure of the gaseous component of the air in contact with the solution remains proportional to the total pressure of the air sample.

The partial pressure of Oxygen in air at atmospheric pressure of 1 Bar (1000mBar) is 210mBar (air is 21% Oxygen), so if a solution of pure water were 100% saturated with Oxygen at atmospheric pressure the partial pressure of Oxygen in solution would be 210mBar. e.g. 20% saturation at a pressure of 1 Bar gives a reading of 42mBar, 50% saturation at a pressure of 3 Bar gives a reading of 315mBar.

Page 86

Appendix B – Probe Parameters

The following table gives the necessary configuration data for a number of DO probes :

Probe Type

Temperature Sensor Type

Membrane Correction Factor

Bias Voltage

LTH OE15 1K Thermistor

3965 N/A

BJ ProcessProbeTM 22K Thermistor

2220 +0.675V

Hamilton OxysensTM 22K Thermistor

2700 +0.670V

Page 87

Appendix B – Probe Parameters

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Page 88

Appendix C – Factory Default Setups

Parameters Galvanic Polargraphic

Units % Saturation % Saturation

Probe Type Galvanic Polargraphic

Temperature Units

°C °C

Temperature Compensation Automatic Automatic

Fixed Temperature Input

+25.0°C +25.0°C

Fixed Salinity Input 0.00 ppt 0.00 ppt

Pressure Compensation Manual Manual

Pressure Units Atm Atm

Fixed Pressure Input 1.00 Atm 1.00 Atm

Set Points

SP1 Source Sensor Sensor

SP1 Trigger Low Low

SP1 Level (Latch High) 50.0% 50.0%

SP1 Latch Low 20.0% 20.0%

SP1 Mode On/Off On/Off

SP1 Dose Alarm No No

SP1 Alarm Time (mm:ss) 05:00 05:00

SP1 Delay (mm:ss) 00:00 00:00

SP1 Hysteresis

(% of SP Level)

1.0% 1.0%

SP1 Cycle Time (mm:ss) 00:30 00:30

SP1 Proportional Latch

(% of range)

20.0% 20.0%

Page 89

Appendix C – Factory Default Setups

Parameters Galvanic Polargraphic

SP2 Source Sensor Sensor SP2 Trigger High High SP2 Level (Latch High) 50.0% 50.0% SP2 Latch Low 20.0% 20.0% SP2 Mode On/Off On/Off SP2 Dose Alarm No No SP2 Alarm Time (mm:ss) 05:00 05:00 SP2 Delay (mm:ss) 00:00 00:00 SP2 Hysteresis 1.0% 1.0% SP2 Cycle Time (mm:ss) 00:30 00:30 SP2 Proportional Band 20.0% 20.0%

SP3 Source Sensor Sensor SP3 Trigger Latch Latch SP3 Level (Latch High) 50.0% 50.0% SP3 Latch Low 20.0% 20.0% SP3 Mode On/Off On/Off SP3 Dose Alarm No No SP3 Alarm Time (mm:ss) 05:00 05:00 SP3 Delay (mm:ss) 00:00 00:00 SP3 Hysteresis 1.0% 1.0% SP3 Cycle Time (mm:ss) 00:30 00:30 SP3 Proportional Band 20.0% 20.0%

SP4 Alarm Trigger Disabled Disabled Cleaning Duration (mm:ss) 00:05 00:05 Interval (hh:ss) 01:00 01:00 Mode Off-Line Off-Line Recovery (mm:ss) 00:05 00:05 Delay N N

Page 90

Appendix C – Factory Default Setups

Parameters Galvanic Polargraphic

Current Outputs

Input A Sensor Sensor Output A 4-20mA 4-20mA Output A Zero 0.0% 0.0% Output A Span 100.0% 100.0%

Input B Temperature Temperature Output B 4-20mA 4-20mA Output B Zero 0.0°C 0.0°C Output B Span 100°C 100°C

Pressure Input

Mode Input Input Units Atm Atm 4mA Level 0.40 Atm 0.40 Atm 20mA Level 2.00 Atm 2.00 Atm Pressure Damping Disabled Disabled Pressure Limit A (“From”) 0.00 Atm 0.00 Atm Pressure Limit B (“To”) 0.00 Atm 0.00 Atm Calibration Mode On-Line On-Line Calibration Access No No

Configuration

Language English English T Input LTH 1K* BJ 22K** Bias Voltage 0.000V +0.675V** Membrane Correction Factor 3965* 2220** Errors Enabled Enabled Input Filter Out Out

* Default for use with the OE15 Probe

** Default for use with the ProcessProbe

Page 91

Appendix C – Factory Default Setups

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Page 92

Appendix D – Customer Setup

Instrument Serial No. : _____________________

Sensor Serial/Type No. : _____________________

Parameters

Units Probe Type Temperature Units Temperature Compensation Fixed Temperature Input Fixed Salinity Input Pressure Compensation Pressure Units Fixed Pressure Input

Set Point 1

SP1 Source

SP1 Trigger

SP1 Level (Latch High)

SP1 Latch Low

SP1 Mode

SP1 Dose Alarm

SP1 Alarm Time (mm:ss)

SP1 Delay (mm:ss)

SP1 Hysteresis (% of SP Level)

SP1 Cycle Time (mm:ss)

SP1 Proportional Band (% of range)

Page 93

Appendix D – Customer Setup

Set Points 2 - 4

SP2 Source

SP2 Trigger

SP2 Level (Latch High)

SP2 Latch Low

SP2 Mode

SP2 Dose Alarm

SP2 Alarm Time (mm:ss)

SP2 Delay (mm:ss)

SP2 Hysteresis (% of SP Level)

SP2 Cycle Time (mm:ss)

SP2 Proportional Band (% of range)

SP3 Source

SP3 Trigger

SP3 Level (Latch High)

SP3 Latch Low

SP3 Mode

SP3 Dose Alarm

SP3 Alarm Time (mm:ss)

SP3 Delay (mm:ss)

SP3 Hysteresis (% of SP)

SP3 Cycle Time (mm:ss)

SP3 Proportional Band (% of range)

SP4 Alarm Trigger Cleaning

Duration (mm:ss)

Interval (hh:ss)

Mode

Recovery (mm:ss)

Delay

Page 94

Appendix D – Customer Setup

Current Output

Input A

Output A

Output A Zero

Output A Span

Input B

Output B

Output B Zero

Output B Span

Pressure Input

Mode

Units

4mA level

20mA Level

Damping

Limit A (“From”)

Limit B (“To”)

Calibration

Mode

Calibration Access

Configuration Language T Input Bias Voltage Membrane Correction Errors Input Filter

Page 95

Appendix D – Customer Setup

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Page 96

Appendix E – Calibration

Calibration Procedures

Normal good practices should be observed when calibrating DO systems. When the instrument is first connected to the oxygen sensor, i.e. when the unit is first installed, or whenever the oxygen sensor is changed or the membrane replaced, the user should perform a zero check and span calibration of the system using the following procedure. If necessary the user can use a span calibration other than 100% by simply setting the span calibration level in the “Set Span Level” item in the “Calibration” menu.

Notes.

• As an aid to stable air calibration, a partially covered bucket can be used to

shield the sensor from the temperature variations which arise from exposure to the wind and sunlight.

• It is recommended that because the OE15 oxygen cartridge has a finite life, a

spare cartridge should be stocked where a significant down time is not acceptable to the application.

• The OE15 sensor requires a minimum fluid flow of 0.5ms

-1

to refresh the depletion layer which forms around the sensor membrane. This applies to both air and solution readings.

• All calibration is done in % Saturation, even if the required operating mode is concentration.

• Approximate sensor current is 700uA = 100% Sat with Galvanic sensor and 60nA = 100% Sat with Polargraphic sensor.

Zero Check in a de-oxygenated solution

• Prepare a fresh solution of approximately 2% wt/vol. of sodium sulphite in demineralised water.

• Wash off any process chemicals or water from the sensor, which may contaminate the solution. Use de-mineralised water or follow the manufacturers cleaning instruction as necessary.

• Set the instrument to read Current.. Select % saturation as the secondary reading. Allow the output to settle in air at (or close to) 100% saturation. Place the sensor in the sodium sulphite solution and observe the current reading. The reading should drop below 10% of the air saturated reading within 35 seconds.

• If this time is exceeded, cycle the sensor between the free air and the solution to improve the speed of the response. If cycling it 3 or 4 times does not improve the response significantly, store the sensor overnight in the solution and then re-test it with a fresh solution the following day. If it still does not respond within the specified time the cartridge membrane should be checked and replaced if necessary, otherwise the electrolyte will have to be replaced (this must be done at the factory for OE15 probes).

Page 97

Appendix E – Calibration

• If the sensor responds quickly enough, check that within another 3 minutes the current reading has fallen to virtually zero (less than 5µA).

• If the current reading is greater than 5µA, select the “Zero Cal” function form the main menu, or from the calibration menu. Press the “ENTER” key and the unit will correct the 0% saturation point to the current input at this point.

Span Calibration in Free Air

• The frequency of this check depends upon the application, but should be made generally once a month.

• Wash off any process chemicals or water from the sensor. Use de-mineralised water or follow the manufacturers cleaning instructions as necessary.

• Set the instrument to read Current. Select % saturation as the secondary reading.

• Stabilise the sensor by leaving it in the process solution for up to 10 minutes. This will allow the temperature compensator networks to reach equilibrium.

• Lift the sensor so that it is just above the process solution, and therefore as close to the temperature of that solution as possible. Observe the instrument readings and wait until the output stabilises. If necessary enable the sensor filter to obtain a stable reading.

• If necessary check and set the calibration level (100%) in the “Calibration” Menu.

• Select the “Span Cal” function from the main menu, or from the calibration menu. Press the “ENTER” key and the unit will correct the 100% saturation point to the current input at this point.

• Enter the Pressure level at the span calibration from within the calibration menu. It is important to have the sensor pressure level correctly entered, especially when the sensor is measuring in a system where pressure can vary over a wide range. If automatic Temperature compensation is selected the unit will automatically store the measured temperature at the instance of the 100% span calibration. If, however, the Temperature compensation is “Manual”, the user will need to ensure that the “fixed” temperature input is set to the temperature the sensor is experiencing at the instance of calibration, as this will be taken as the calibration temperature.

Page 98

Appendix F – Temperature Sensor Data

The table below lists approximate resistance values of temperature sensors that may be used with the MXD53 series. Not all options are available on all models.

Temperature

(°°°°C)

PT1000

RTD**

LTH 1K

Thermistor

BJ 22K

Thermistor

1000.0Ω 2691Ω 64.88 kΩ

1039.0Ω 1779Ω 41.34 kΩ

1077.9Ω 1204Ω 26.97 kΩ

1097.3Ω 1000Ω 22.00 kΩ

1116.7Ω 833.7Ω 18.03 kΩ

1155.4Ω 589.0Ω 12.30 kΩ

1194.0Ω 423.9Ω 8.57 kΩ

1232.4Ω 310.5Ω 6.07 kΩ

1270.7Ω 231.0Ω 4.38 kΩ

1308.9Ω 174.5Ω 3.21 kΩ

1347.0Ω 133.6Ω 2.39 kΩ

100

1385.0Ω 103.6Ω 1.80 kΩ

** For a PT100 RTD, divide the PT1000 values by 10

Page 99

Appendix F – Temperature Sensor Data

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Page 100

Appendix G – Pressure Conversions

The following table provides conversions between all the common pressure units

mm Hg

760

750

7.50

73.36

51.72

psi

14.696

14.504

0.145

1.422

0.0194

m H

10.33

10.20

0.102

0.703

0.0136

kPa

101.33

100

9.81

6.895

0.133

Bar

1.0133

0.01

0.0981

0.069

0.00133

Atm

0.987

0.00987

0.0968

0.061

0.00132

Atm

Bar

kPa

m H

psi

mm Hg