LTH MOD53 Manuale utente

MOD53

DISSOLVED OXYGEN MONITOR

OPERATION GUIDE

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.

manual, complete or in part or in any different form requires our explicit approval.

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

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.

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

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

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 pO2 (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)

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

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 WIRING. 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.

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.

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.

Indice

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