lpha-2000 Series lpha-2000 Series Process ControllersProcess Controllers

lpha pH/ORP 2000lpha pH/ORP 2000 lpha CON 2000lpha CON 2000lpha DO 2000lpha DO 2000

Eutech Eutech InstrumentsInstruments

FEATURES of FEATURES of lpha2000 Serieslpha2000 Series

• ASIC-based with intelligence and flexibility - ASIC-based with intelligence and flexibility - matrix format programmingmatrix format programming

• User-selectable functions that can be User-selectable functions that can be customized to suit one’s requirementscustomized to suit one’s requirements

• On-line push-button calibrationOn-line push-button calibration• Built-in non-volatile memory backupBuilt-in non-volatile memory backup

FEATURES of FEATURES of lpha2000 Serieslpha2000 Series

• Multi-level password protection - avoid Multi-level password protection - avoid unauthorized tampering of the systemunauthorized tampering of the system

• Auto/Manual selection for control functionAuto/Manual selection for control function• HOLD functionHOLD function• Proportional and Proportional and Proportional Integral Proportional Integral

ControlControl - Pulse length/Frequency - Pulse length/Frequency

PROPORTIONAL VS PROPORTIONAL PROPORTIONAL VS PROPORTIONAL INTEGRALINTEGRAL

+ -

ERROR SIGNAL

AMPLIFIER PROCESS

+ -

ERROR SIGNAL

AMPLIFIER

SUMMING

++

INTEGRATOR

OUTPUT

PROCESS

OUTPUT

SETTING

FEED BACK

020406080

100120

0 2 4 6 8 10 12 14 16Integration Interval

Cor

rect

ion

in %

PI CONTROL - ERROR CORRECTION

PI Control

P Control

FEATURES of FEATURES of lpha2000 Serieslpha2000 Series• 14 segment LCD display14 segment LCD display

• Backlit ‘Transflective’ LCDBacklit ‘Transflective’ LCD

• Two current outputsTwo current outputs • Choice of 0/20 or 4/20 mAChoice of 0/20 or 4/20 mA• 22mA for ‘Out of Range’ condition22mA for ‘Out of Range’ condition

•Push-button display of set pointsPush-button display of set points

FEATURES of FEATURES of lpha2000 Serieslpha2000 Series

• Zoomable transmitter outputZoomable transmitter output• Galvanically isolated signal outputGalvanically isolated signal output• Isolated 12V/50mA DC outputIsolated 12V/50mA DC output

• On/Off delay time for Set point relaysOn/Off delay time for Set point relays• Set point Relay state programmable Set point Relay state programmable

FEATURES of FEATURES of lpha2000 Serieslpha2000 Series

• Hi/Lo feature for set-points Hi/Lo feature for set-points • 4 Relays, 2 for Setpoints, Alarm and Wash4 Relays, 2 for Setpoints, Alarm and Wash

• On-delay for Alarm relayOn-delay for Alarm relay• Hysteresis band -- prevent signal overshoot Hysteresis band -- prevent signal overshoot

from false triggering & on/off continuouslyfrom false triggering & on/off continuously

The controller relay activates when the set point is reached. In the reverse direction, it does not de-activate when the value reaches the set point. Instead, it continues to be active till the value reaches the amount set by the Hysteresis band.

HYSTERESISHYSTERESIS

4 4.5 7 9.5 10 SP1 SP2

RELAY ON

FORWARD DIRECTION

REVERSE DIRECTION

HYSTERESIS BAND ( DEFAULT 0.5 pH )

SP1 Set to LOSP2 set to HI

RELAY OFF

FEATURES of FEATURES of lpha2000 Serieslpha2000 Series

• Choice of Pt100 or Pt1000Choice of Pt100 or Pt1000•Temperature in Centigrade or FahrenheitTemperature in Centigrade or Fahrenheit

• Two wire or three wire systemTwo wire or three wire system• Choice of ATC or MTC -- independent Temp Choice of ATC or MTC -- independent Temp

setting for Process and Calibrationsetting for Process and Calibration•Switched Mode power supplySwitched Mode power supply

FEATURES of FEATURES of lpha2000 Serieslpha2000 Series

• 80 to 250 V AC/DC auto detect80 to 250 V AC/DC auto detect

• Detachable back panel connectorsDetachable back panel connectors• Standard 144x144mm front panelStandard 144x144mm front panel• Protection against EMI with CE mark Protection against EMI with CE mark

endorsedendorsed• IP 65/NEMA 4X rated field mount IP 65/NEMA 4X rated field mount

housing – W serieshousing – W series

FEATURES of FEATURES of lpha-pH2000 Serieslpha-pH2000 Series

• pH/ORP mode of operation, both in one pH/ORP mode of operation, both in one controllercontroller

• ORP mV or ORP % mode of operationORP mV or ORP % mode of operation• Symmetrical or Asymmetrical input Symmetrical or Asymmetrical input • Choice of use with Glass or Antimony electrodeChoice of use with Glass or Antimony electrode

FEATURES of FEATURES of lpha-pH2000 Serieslpha-pH2000 Series

• Auto buffer recognition - choice of 7 Auto buffer recognition - choice of 7 buffersbuffers

• One point Cal choice of 7.00 or 6.86 pHOne point Cal choice of 7.00 or 6.86 pH• Electrode status display after calibrationElectrode status display after calibration• On line offset adjustment for pH and TempOn line offset adjustment for pH and Temp

CHARACTERISTIC CURVE OF CONTROLLER

SP1 Xp = 0 SP2 Xp=0

100%

50%

100%

50%

Prop. Band Xp Prop. Band Xp

LIMIT CONTROLLER

PROPORTIONAL CONTROLLER

FEATURES of FEATURES of lpha-CON2000lpha-CON2000

• 2 cell or 4 cell operation2 cell or 4 cell operation

• Wide range up to 1000 mS/cmWide range up to 1000 mS/cm

• User selectable – 7 rangesUser selectable – 7 ranges

• Cell constant input for automatic correctionCell constant input for automatic correction

• Cell constant from 0.005 to 9.999Cell constant from 0.005 to 9.999

FEATURES of FEATURES of lpha-DO2000lpha-DO2000

• mg/l , ppm or % saturation mode of operationmg/l , ppm or % saturation mode of operation• Extended range 0 to 300%, 0 to 25 mg/lExtended range 0 to 300%, 0 to 25 mg/l

• Pressure compensation for the % sat. modePressure compensation for the % sat. mode• Auto calibration in the % saturation modeAuto calibration in the % saturation mode• Choice of two cells: 0-10 or 0.5 - 40 ppm Choice of two cells: 0-10 or 0.5 - 40 ppm • Pressure input in mmHg and KpaPressure input in mmHg and Kpa

Differential pH Differential pH MeasurementsMeasurements

Combined Electrode PairCombined Electrode PairConventional Technique

E1 E2

E1

E2 E1- E2

100 MEG

pHGlass

Electrode

pHReferenceElectrode

Conventional ConstructionConventional Construction

pHReferenceElectrode

pHGlassElectrode

E1E2

E1

E2 E1- E2

100 MEG

Pitfalls of Conventional pHPitfalls of Conventional pH

• Plugging junction• Poisoning of the

internal element• Rapid electrolyte

depletion• Ground loops

Technique ComparisonTechnique Comparison• Combination Combination

ElectrodeElectrode• Differential Differential

ElectrodesElectrodesPreamplifier

Benefits of Differential pHBenefits of Differential pH• Reduced cost of ownership Reduced cost of ownership • Long life with glass reference electrodeLong life with glass reference electrode

– Replaceable quad junction salt bridgeReplaceable quad junction salt bridge– Buffered electrolyte (typically 7pH)Buffered electrolyte (typically 7pH)

• Long sensor to analyzer distances without coaxLong sensor to analyzer distances without coax• Low impedance reduces noise pickupLow impedance reduces noise pickup• Ground rod eliminates ground loopsGround rod eliminates ground loops• Adjustable isopotential point Adjustable isopotential point

Reference SolutionsReference Solutions

7 pH Buffer7 pH Buffer

• Reference solution when Reference solution when using pH glassusing pH glass

• 0.05 Molar Potassium 0.05 Molar Potassium Phosphate, pH adjusted Phosphate, pH adjusted with NaOHwith NaOH

Reference Electrode Reference Electrode SolutionSolution

• Reference solution when Reference solution when using silver/silver using silver/silver chloride wirechloride wire

• 4 Molar KCL with AgCL4 Molar KCL with AgCL

Differential pH ReferenceStandard Combination pH Reference

Differential Differential TechniqueTechnique

E1 - E3

-(E2 - E3)

(E1 - E2)

SolutionGround

Electrode(E3)

TemperatureCompensator

ReferenceElectrode

(E2)

ProcessElectrode

(E1)

Preamplifier

Differential pH at its BestDifferential pH at its Best

• Differential pH measurementDifferential pH measurement• Two protected pH glass Two protected pH glass

electrodeselectrodes• Ground rodGround rod

– Accurate temperature measurementAccurate temperature measurement– Up to 1000 foot cableUp to 1000 foot cable

• Very large reference chamber Very large reference chamber – Replaceable solutionReplaceable solution– Volume resists contaminationVolume resists contamination– Any reference from 2 pH to 10 pHAny reference from 2 pH to 10 pH

• Long-lasting salt bridgeLong-lasting salt bridge– Quad junctionQuad junction– ReplaceableReplaceable– Smooth surfaces reduce fouling.Smooth surfaces reduce fouling.

Low profile pH glass

Smooth surfaces reduce chance of fouling

Replaceable quad junction salt bridge

Ground rod

1.5 Inch NPT threads

Short 6-inch bodySix wrench flats

Huge internal reference chamber

• Easy Replacement• O-Ring sealed• Quad Junction• Seals in sanitary

fittings

CutawayCutawayReference Electrode

Active Electrode

Amplifier

Reference Buffer

Quad Junction Bridge

Ground Rod

O-ring seals

pH Sensor CarepH Sensor Care

• DehydrationDehydration• Detrimental factors to electrode lifeDetrimental factors to electrode life

– AbrasionAbrasion– CoatingCoating– Temperature ShockTemperature Shock

• TransportationTransportation• StorageStorage

pH Sensor CleaningpH Sensor Cleaning

CompetitionCompetition

• GLI (Patent 3,709,796 and 3,862,895)GLI (Patent 3,709,796 and 3,862,895)• RosemountRosemount• E + HE + H• ATIATI• AquametricsAquametrics

InstumentationInstumentation??Alpha pH 2000DAlpha pH 2000D