MCD53 MICROPROCESSORCONDUCTIVITY MONITOR

www.lth.co.uk

• Simple Intuitive Programming

• IP66 Panel or Surface Mount Options

• Large Backlit Multifunction Display

• Ultra Pure Water to SolutionConcentration Measurement

• Compliant with latest USP Requirements

• Able to Display in Conductivity,Resistivity or ppm

• Auto Range, Remote Range or Single Range

• Up to Four Relay Outputs

• Dose Alarm Timer Prevents Overdosing

• On/Off, Time & Pulse ProportionalControl Options

• 2 x Isolated fully Configurable 0/4-20 mA Outputs

• On-Line HELP with Text Error Messages

• 18-36 v Supply Option

Programming made easy

The large backlit multi-function display guides the operator effortlessly through the structuredprogramming procedure, reducing the need to referto the handbook.

An initial configuration has been pre-programmedinto the MCD53, minimising the number of parametersthat will actually need to be changed for mostusers. The MCD53 has been designed with twolevels of programme complexity to cater for bothnovice and experienced instrument operators.

In the Basic set-up mode, only a few settings arerequired to configure and run the instrument. Theseare the cell type (or cell constant), display (operating)range, set point modes and values, temperaturecompensation and current output range (as required).

In the Advanced set-up mode, all the options andfunctions, which you would normally associate witha high-end, multi-range conductivity controller, togetherwith some new innovative options, can be configured.

On-line HELP facilities consist of a series of texterror messages which are displayed whenprogramming is incorrect, or if a sensor is notreading a sensible value for the instrument set-up.

A further enhancement is multi-level security, whereday to day operator access can be limited to viewingdata and settings only, while allowing full access tothe instrument programmer.

Configuration data can be saved in one of twoindependent back-up locations, which can be usedfor fast reconfiguration, emergency restoration ofsettings, recovery after tampering by unauthorisedoperators, etc.

One Instrument for all Applications

Covering a wide range of conductivity measurement,from ultra pure water (0.055 µS/cm) to solutionconcentration measurements (1,000 mS/cm), theMCD53, can be configured to display the readingsin conductivity, resistivity or ppm. The instrumentcan be set for single range, auto range or remoteranging via external digital inputs.

A universal power supply allows a single connectionto any supply between 80 to 264v AC or DC. An option for low voltage operation between 18-36vAC or DC is also available.

Adjustable cell constant selection from 0.009 to19.99 and temperature compensator selection ofPt100 or Pt1000 allows the instrument to be usedwith almost any conductivity cell. Multilingual textdisplays can be selected with a choice of English,French, Spanish and Italian.

Flexible Control & Alarm Configuration

Up to 4 relay outputs offer on/off control withvariable hysteresis and time delays if required.

New features include USP alarm and pre-trigger,time and pulse proportional relay operation, which can be used in applications where overshoot or undershoot have been a problem, or to directlydrive a diaphragm pump where previously a separatedrive module was necessary.

USP Stage 1 test specifies that all conductivitymeasurements must be made uncompensated for temperature. A table lists the maximum allowedconductivity values at different temperatures. With the instrument configured in the USP mode the table of conductivity against temperature valuesis applied to set point 1 and should the limits be exceeded then the output relay is energised.

USP Pre-Trigger sets relay 2 to energise at a programmable level prior to the Stage 1 test. This will give a warning that the water isapproaching non-compliance.

The fourth relay can also be programmed to energiseon a variety of different functions including errors,instrument status, e.g. off-line or calibrate mode, or if a dose alarm time has been exceeded.

Current Outputs

Up to 2 industry standard, isolated outputs provideretransmission of the measurement as 0/4-20 mA signals and can be configured as conductivity,resistivity or temperature. These are alsoexpandable & can be offset anywhere in the chosen measurement range.

Calibration

Both measurement inputs and current output canbe individually calibrated from the front panel. Forapplications requiring very accurate measurementsit is possible to match the instrument to the calibratedcell constant. Eliminating up to 2% error caused byvariations of the cell constant from its nominal value.An off-line facility allows the instrument to beadjusted without disturbing external processes.

Temperature Compensation

Automatic temperature compensation can be appliedto the measurement using an adjustable linear slopefor changes due to dissolved salts and a fixed curvefor the pure water contribution. For applicationswhere temperature compensation is not required it can be switched out. Alternatively a manualtemperature can be entered if required.

SpecificationConductivity sensor Any LTH conventional conductivity

cell. Cable length up to 100metres of type 54D. Othermanufacturers cells can be used.

Ranges of 0-0.999 µS/cm to 0-999.9 conductivity mS/cm (K= 0.01 to 10.0) measurement 0-100 KΩ.cm to 0-100 MΩ.cm

(K= 0.01 to 1.0). See the following range / cellconstant table.

Conductivity 0.5 % of range.accuracy

Linearity 0.1 % of range.

Repeatability 0.1 % of range.

Operator adjustment ±10% slope (gain) adjustment(conductivity) for solution calibration.

Temperature sensor Pt 100 or Pt 1000 RTD. Up to 100 metres of cable.Temperature sensor can bemounted in the conductivity cell or separately.

Range of temperature -50°C to +300°C (-58°F tomeasurement 572°F) for full specification.

Temperature accuracy 0.2°C.

Operator adjustment ±20°C or ±32°F.(temperature)

Range of temperature -10°C to +130°C (14°F tocompensation 266°F) for full specification.

Temperature Fixed UPW curve plus variable compensation type slope 0-3.9% / °C over -10 to

+110°C. Selectable In or Out.

Temperature ±20°C, or ±32°F.compensation base

Remote range Using a 3 pole 8 way remote changing mounted switch, maximum

cable length 100 metres.

Off-line facility The relays are de-energised and (for calibration the current output is held at theand commissioning) last on-line value.

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

Ambient temperature 0.01% of range / °C (typical).variation

Display Custom back-lit LCD module. 4 character (& sign) 7 segment(20 mm high) for measurevalue; 2x3 dot matrix for unitsindication; and 1x16 dot matrixfor information and programming.

Digital Inputs 3 digital inputs (contact closure)for remote selection ofmeasurement range.

Current output Each selectable 0-20 mA or (optional 1 or 4-20 mA into 750 ohms max.,2 outputs) fully Isolated to 2kV.

Expandable up to 5% of anyoperating range and offsetanywhere in that range.

Operator adjustment ±1 mA zero and ±1 mA span(current output) for remote monitor calibration.

Setpoints and Fully configurable setpoints control relays (2 (uS, mS, MΩ, °C) with volt free standard 4 optional) contacts for each relay. Rated

at 5A 30V DC / 5A 250V AC(non-inductive). Red LED'sindicate relay energised.

Operating modes On/Off, USP, USP pre-trigger, (Control relays) Time proportioning, Pulse

proportioning and Band modesselectable for each relay.Adjustable delay timer up to10:00 mm:ss in the On/Off mode.Hysteresis 0 to 9.9% in theOn/Off mode.Adjustable dose alarm timer upto 15:00 mm:ss in all modes.Adjustable cycle time andproportional band in theproportional modes.

Operating modes This relay can be set to (Alarm relay 4) energise on any of the

following instrument conditions:Sensor alarm, Dose alarm,Calibration, Off line, Any error.

Switches Four tactile-feedback push buttons.

EMC: Immunity BS EN 50082-2:1995.

EMC: Emissions BS EN 50081-1:1994.

LVD: Safety standard BS EN 61010-1:1993.

Power supply Universal 80-264v AC or DC,10W max.Low voltage Option 18-36v ACor DC, 15W max.

Panel-mount housing ABS plastic rated IP66 to thefront when installed in a panel.

Panel-mount weight Less than 600 grams(instrument only).

Panel-mount 96 x 96 x 140 mm (H, W, D) dimensions including connectors.

Surface-mount Expanded polyurethane foam housing rated IP66.

Surface-mount Less than 1.5Kg (instrument weight only).Specifications

continuedSurface-mount 305 x 200 x 82 mm (H, W, D) dimensions excluding mounting brackets.

LTH Electronics LtdChaul End Lane, Luton, Beds. LU4 8EZ England

Tel: +44 (0)1582 593693 Fax: +44 (0)1582 598036email: sales@lth.co.uk web: www.lth.co.uk

LTH Electronics Ltd reserves the right to make changes to this data sheet or the product without notice, as part of our policy of continued developments andimprovements. All care has been taken to ensure the accuracy of information contained in this data sheet. However we cannot accept responsibility for any errorsor damages resulting from errors or inaccuracies of information contained herein.

These products comply with current European Directives

Type No Part No Description

MCD53P 1183 IP66 96x96 Panel mounted conductivity / resistivity monitor with 2 relay outputsMCD53S 1184 IP66 Surface mounted conductivity / resistivity monitor with 2 relay outputs.MCD53PI 1185 IP66 96x96 Panel mounted conductivity / resistivity monitor with 2 relays

& a single current output.MCD53SI 1186 IP66 Surface mounted conductivity / resistivity monitor with 2 relays

& a single 4-20mA current output.MCD53P2 1187 IP66 96x96 Panel mounted conductivity / resistivity monitor with 4 relay

& 2 current outputs.MCD53S2 1194 IP66 Surface mounted conductivity / resistivity monitor with 4 relay

& 2 current outputs.MCD53PI 1210 IP66 96x96 Panel mounted conductivity / resistivity monitor with 2 relays

& a single current output. 18-36v supply.MCD53SI 1211 IP66 Surface mounted conductivity / resistivity monitor with 2 relays

& a single current output. 18-36v supply.MCD53P2 1214 IP66 96x96 Panel mounted conductivity / resistivity monitor with 4 relay

& 2 current outputs. 18-36v supply.MCD53S2 1215 IP66 Surface/field mounted conductivity / resistivity monitor with 4 relay

& 2 current outputs. 18-36v supply.

Order Codes

Ranges NOMINAL CELL CONSTANTCONDUCTIVITY 0.010 0.100 1.000 10.000 to 0.999 µS/cm

0 to 9.999 µS/cm

0 to 99.99 µS/cm

0 to 999.9 µS/cm

0 to 9.999 mS/cm

0 to 99.99 mS/cm note 1

0 to 999.9 mS/cm note 1RESISTIVITY 0.010 0.100 1.000 10.000 to 99.99 KΩ.cm

0 to 999.9 KΩ.cm

0 to 9.999 MΩ.cm

0 to 99.99 MΩcm

TOTAL DISSOLVED SOLIDS 0.010 0.100 1.000 10.000 to 0.999 ppm

0 to 9.999 ppm

0 to 99.99 ppm

0 to 999.9 ppm

0 to 9999 ppm

0 to 99.99 ppt

Note 1: Maximum measurement range will be limited by temperature. With the temperature compensationcoefficient set to 2%/C the range derates linearly from full scale at 25° to 50% of scale at 100°C.

Cell Constants / Measurement Ranges