Chemitec - 42 Series - Process Control Device Brochure

Measurementand Control The 42 series developed byChemitec is dedicated to thewater treatment and industrysectors, and enables thefollowing parameters to bemeasured:4pH/REDOX4Dissolved oxygen4Conductivity4Turbidity4Suspended solids4Chlorine4Chlorine dioxide4OzoneWall-mounted version with IP66 protectionrating (144 x 144 x 120 mm)Panel-mounted version(144 x 144 x 100 mm)42 seriesDisplay4Simultaneous measurement (numerical and bar graph) andtemperature values.4Scrolling output values.4Graphic icons for: status of digital outputs, washing cycle,data recording, alarms.4Possibility to display the measurement only in large format.Data recording44-bit internal flash memory (about 16,000 records).4Recording interval: 1 to 99 min.4Type: Circular (F.I.F.O.) or filling.4Ability to view the logged data in table or graphic form, withindication of the maximum, minimum and average values inthe selected periods.PID control4P - PI - PID functions activated on the analogue or digitaloutput.4Proportional range: 0 to 500%.4Integral time: 0:00 to 5:00 min.4Derivative time: 0:00 to 5:00 min.2 analogue outputs4Output 1 programmable for measurement.4Output 2 programmable for measurement / temperature /PID control.4 The limits of the outputs are freely programmable within themeasuring range.4 digital outputs4ON/OFF set point: Programming the operating range(hysteresis/direction) and start/stop time 000 to 999 seconds.4PID control: Pulses, frequency or PWM (2 set points).Process control deviceInputMeasurementTemperature15 - 30 VAC-VDC inputDigital inputUniversal power supply 100 – 240 VACGroundKeypad and graphic displayOutputRS485 serial port and USBCurrent outputsDigital outputs• Set Point 1• Set Point 2• Alarm /Temp 1• Washing / Temp 212345679810InputMeasureInputTemperatureVac/dcInputDigitalInputPowerSupply100÷240 VacGroundKeypadGraphicdisplayCPUSerial PortRS4851st ChannelSerial PortRS4852nd ChannelUSB portOutput4÷20 mA1st ChannelOutput4÷20 mA2nd ChannelRelay 1SetpointRelay 2SetpointRelayAlarm/Temp1RelayAlarm/Temp2NONONONOAlarm4Programmable for: tool faults, minimum,maximum, set point delay, stay time (livecheck).4Delay time: 00:00 to 59:59 mm:ss withminimum interval of 15 sec.4Stay time 00:00 to 99:59 hh:mm4Set point deactivation (in case of alarm):Enabling/Disabling.Washing electrodes4Programming the interval (minimum 15 min)and the duration.4During washing, all the analogue and digitaloutputs are frozen.Digital input4To disable the doses.RS485 serial port4For set-up and remote real time acquisition orfor downloading data (using dedicatedsoftware).4 MODBUS RTU communication protocol.USB port4USB for direct download on PEN DRIVE(optional).Manual controls4Possibility to simulate the analogue and digitaloutputs from the keypad.Temperature compensation4Using PT100 sensor with 3 or 4 wires, or PT1000.12367458910Electrical connectionsMeasurementand ControlMeasurementand Control4Main menu with graphic icons4Interactive, easy to read interfaceDisplay of stored data in graphicalform, even during RUN TIMEmeasurementMODBUS RTU serial interface for: 4Communication of data in real time4Downloading the data stored on PC via SW or directly on the removable USB pen drive (optional)Simple and intuitive software38 3816.2514414418 30122,525.535 3532 8068Ø6.54 x pg9 2 x pg11Wall-mounted version with IP66 protection ratingPanel-mounted version 144 x 144123108968892927Panel-mounted version 96 x 96Dimensioni Measurementand ControlMeasurementand ControlModel MeasuringrangeMinimumconduc.MaximumtemperatureMaximumpressurePorous baffle Fill ConnectionsProcessfitting MaterialS401/VG 2 to 14 pH 5 µS 80°C 6 bar Open hole GEL S7 PG 13,5 Glass12x120S401/LC 0 to 14 pH < 0,2 µS 40°C 16 bar Open hole GEL S7 PG 13,5 Glass12x120S402/PS 0 to 14 pH 5 µS 80°C 0,2 bar Annular KPCL/KN03 5 m cable standardØ12Glass12x230S408/MEC 0 to 14 pH 50 µS 130°C 16 bar Open hole GEL S7 PG 13,5 Glass12x120S408/POL 2 to 14 pH 5 µS 90°C 6 bar Open hole GEL S7 PG 13,5 Glass12x120S403/PS ±1000 mV 50 µS 60°C 0,2 bar Annular KPCL/KN03 5 m cable standardØ12Glass12x230S406/VG ±1000 mV 50 µS 80°C 6 bar Open hole GEL S7 PG 13,5 Glass12x120S406/POL ±1000 mV 50 µS 130°C 16 bar Open hole GEL S7 PG 13,5 Glass12x120pHREDOX4238 pH/REDOXpH0 to 14 pHResolution 0,01 pHREDOX±1500 mVResolution 1 mVDual parameter versions available4238-38 [pH/REDOX - pH/REDOX]4238-22 [pH/REDOX - Conductivity]4238-23 [pH/REDOX - Inductive cond.]4238-83 [pH/REDOX - Dissolved oxygen]4238-63 [pH/REDOX - Turbidity/SS]Measuring rangeThe electrodes shown below are all of the combined type (Measuring + Reference), donot require maintenance and differ in their structural characteristics, making themsuitable for many applications. The elements that must be considered when choosing anelectrode are: measuring range, temperature, pressure and chemical substances presentin the sample and type of assembly on the system.pH and REDOX electrodes4pH or REDOX measurement using measuringtechnique for demanding or prohibitiveapplications4Replaceable measuring and referenceelectrodes4Built-in temperature with PT1004Galvanically-isolated RS485 outputS401DIFF digital pH probeMeasuring range pH from 0 to 14Temperature from 0 to 50 °CCharacteristics Materials PVC / GlassDimensions Length 230 mm Ø42 mmProtection rating IP68Power supply 12VDCConnections 1” GasLength of cable (included) 10 mS406DIFF digital Redox probeMeasuring range REDOX from -1500 to +1500 mVTemperature from 0 to 50 °CCharacteristics Materials PVC / GlassDimensions Length 230 mm Ø42 mmProtection rating IP68Power supply 12VDCConnections 1” GasLength of cable (included) 10 mSonde pH e REDOX con uscita RS485 Measurementand ControlMeasurementand ControlModel Measuringrange Constant Max.temp.Max.press.BodymaterialElectrodematerialProcessfitting ConnectionsS411S 0 to 2.000 µS K=1 50°C 1 bar PVC AISI 316 1”GAS -S411 0 to 20.000 µS K=1 50°C 2 bar PVC Graphite 1”GAS 5 m or 10 m integral cableS411/TEF 0 to 10.000 µS K=1 100°C 2 bar PTFE AISI 316 1”GAS 5 m integral cableS411/C(*) 0 to 20.000 µS K=1 50°C 2 bar PVC Graphite 1”GAS 5 m integral cableS411/TEF/C(*) 0 to 10.000 µS K=1 70°C 4 bar PTFE AISI 316 1”GAS 5 m integral cableS411/4E(*)4 cylindrical electrodes 0 to 1.000 mS K=0,55 70°C 4 bar EPOXY Graphite 13.5 PG 5 m integral cableS428 K0.1High range 2 to 100 mS K=0.1 120°C 0,2 bar Vetro Platinum - Four-pole screw connectorS411/U K0.1(*)High range 10 to 200 mS K=0.1 120 °C 2 bar PES Graphite ½” NPT Four-pole screw connectorS411/U K1(*)Medium range 0 to 50.000 µS K=1 120 °C 2 bar PES Graphite ½” NPT Four-pole screw connectorS411/U K10(*)Low range 0.05 to 200 µS K=10 120 °C 2 bar PES Graphite ½” NPT Four-pole screw connectorS411/P K100(*)Very low range 0.04 to 20 µS K=100 130 °C 16 bar AISI 316 AISI 316 ½” NPT Four-pole screw connectorS411/P K10(*)Low range 0 to 1000 µS K=10 130 °C 16 bar AISI 316 Graphite ½” NPT Four-pole screw connector4222 ConductivityConductivity0 to 20 µS; 0 to 200 µS; 0 to 2,000 µS; 0 to20,000 µS; 0 to 200,000 µSResolution 0.01 µS; 0.1 µS; 1 µS; 10 µSSpecially designed for use in an industrial environment, these make it possibleto cover a very wide measuring range, thanks to versions with temperaturesensor, special versions with PVC, PTFE, PVDF body, graphite, steel or platinumelectrodes. Conductivity is measured by submerging the two metal electrodesof the probe in the solution to be measured. The passage of current betweenthe two probes allows the electrical resistance of the liquid and therefore itsconductivity to be measured. The measurement is influenced by thetemperature. In saline solutions, there are variations of 2% / °C. This variationcan reach 7% / C, therefore the use conductivity probes with no temperaturesensor is preferable if the solution being examined remains at a temperatureof between 15 °C and 25 °C.For industrial applicationsDual parameter versions available4238-22 [pH/REDOX - Conductivity]4293-22 [Chlorine - Conductivity]S411-S428 Conductivity probesMeasuring range4223 Inductive conductivityConductivity0 to 1,000 µS; 0 to 10,000 µS; 0 to 100,000 µS;0 to 1 Simens (0 to 999.999 mS)Resolution 1 µS; 10 µS; 100 µS; 1,000 µSS411/IND Inductive conductivity sensorsThe S410/IND series of inductive sensors has been engineered anddeveloped to produce an electrode that is very powerful but at thesame time competitive. The result has been obtained by moulding thesensor made using polypropylene reinforced with fibreglass.This sensor offers all the advantages of the inductive cond.measurement method, including the absence of passivation of theconventional conductivity electrodes. All the sensors in the S410/INDrange are temperature-compensated, and are also designed for in-line, submersion or tank installation.4Low maintenance4Versions for in-line, submersion or tankinstallation4Ideal for cooling towers, process water,concentrated solutionsTechnical dataSensor Temperature -5 to 60°C(without freezing)Contact materials Glass-reinforcedpolypropyleneTemp. compensation 2 PT1000 wiresCable Standard 5 metreConnection ½" BSP maleProtection rating IP68Materials PVC with Viton gasketsOperating temperature -5 to 60 °C (without freezing)Submersion length 600 or 1200 mmAssembly Standard bracket oroptional flangeOperating pressure From vacuum to 6.5bar (100 psi)MechanicalconstructionDual parameter versions available4238-23 [pH/REDOX - Inductive cond.]4293-23 [Chlorine - Inductive cond.]Measuring range Measurementand ControlMain measuring rangeThe oxygen contained in the liquids is measured using the so-called Clark cell system. These cells generate acurrent proportional to the partial pressure of the oxygen, which can be detected using a suitable signalconverter. In order to prevent interference during measuring, the Clark cell is protected by a gas-permeablemembrane. The membranes typically used are made from PTFE but, as this material is mechanically fragile,frequent changing is often necessary, along with the related “demanding” operations (interruption ofmeasurement, replacement of the electrolyte, regeneration of the electrodes). The S423 solves this problem byusing a membrane made from OPTIFLOW™. Manufactured as a sheet around a layer of steel, it is very stablemechanically and very resistant to chemically aggressive environments as well as high pressure. Thanks to thespecial construction of the measuring electrodes, this system also makes the sensor totally “maintenance free”.MaintenanceOXYSENS™ sensors are maintenance-free, and do not require the replacement of the membrane, electrolyte orregeneration of the electrodes, to measure the oxygen in aqueous samples. Typical applications include watertreatment plants and the fish industry.Electrode material Silver-platinum combinationElectrolyte Alkaline solutionMembrane OPTIFLOW™Temperature sensor NTC 22 kOhmPolarisation current -670 +/- 50 mVSensitivity 40 ... 80 nA at 25 °C in airStabilisation time typical 15 min., max. 1 hOperating temperature 0 ... 60 °CStorage temperature -10 ... 60 °C, with water insidethe protective capPressure 0 ... 4 bar during insertion; max.0.5 bar in total during submersionOuter diameter 12 mmConnection PG 13.5 – threadedConstruction materials 1.4435 stainless steel, PEEK,silicone, NBRRegeneration not requiredResponse time t98%max. 60 s at 25 °C, from air tonitrogenTemperature response approx. 3.1%/KMeasuring liquid speed min. 0.03 m/sInfluence of flow rate < 5% at 25°COxygen consumption approx. 20 ng/h in air at 25 °CResidual current < 0.5% current in airZero drift< 0.5% current in air every 2months at 25°C or in water instable conditionsSensitivity drift < 10% every 2 months at 25°C inwater in stable conditionsTechnical dataMeasurementand ControlDissolved oxygen0 to 20.0 ppm or mg/l - 0 to 200% SATResolution 0.1 ppm or mg/l - 1% SATS423/OXYSENS™4283 Dissolved OxygenDual parameter versions available4238-83 [pH/REDOX - Dissolved oxygen]4262-83 [Turbidity - Dissolved oxygen]4263-83 [Suspended solids - Dissolved oxygen]4283-83 [Dissolved oxygen - Dissolved oxygen]with S423/C/OPT optical sensor onlyMeasuring rangeMeasuring principle Optical by means of luminescenceMeasuring ranges 0,00…20,00ppm / 0-200 % Sat0…50°CResolution 0,01 ppmPrecision +/-0,1ppm / +/-1 %Temperature compensation via NTCResponse time 90% of the actual value in less than60 secondsLiquid stirring speed Not requiredDigital interface RS-485 ModbusMaximum refresh time < 1 secondMembrane Interchangeable sensor capTypical duration 2 years.Electrodes No electrodeElectrolyte No electrolyteDimensions Diameter: 34 mmLength: 180 mmFitting: 3/4" maleWeight 850 g (sensor + 10 m cable)Materials in contact with the liquid Stainless steel 316L/PVCMaximum operating pressure 5 barProtection rating IP68Storage temperature -10….. + 60°CTechnical dataFields of application• Biological purification systems (aeration, nitrification/denitrification tanks etc.)• Industrial water treatment plants• Monitoring surface water• Aquaculture• Water conditioningOptical technologyThe S432/C/OPT sensor measures oxygen with a built-in temperature probe. The measuring technique isbased on the optical principle: a diode emits a light blue towards a support on which a fluorescent substrate isapplied. The substrate initially reacts by emitting a red light (luminescence), then returns to its initial state. Theintensity of the red light produced and the rate of return to the initial state are related to the concentration ofoxygen present. This innovative method ensures reliable, accurate measurements with no drift over time,therefore system calibration is no longer necessary. No maintenance is required except for replacing theluminescent support about every two years. The system does not consume oxygen, therefore it is suitable forthe most varied fields of application, including those in which the measuring liquid is almost stationary.Digital technologyBuilt-in pre-amplification circuit and digital signal processing. The S432/C/OPT sensor saves the calibrationdata for optimal data management. The output signal is provided on the RS 485 serial port.Physical characteristicsCompact, sturdy and lightweight, the stainless steel body enables fixed or portable applications.4Optical technology: no membrane or electrolyte4No signal drift: no calibration4Digital output: Modbus RS-4854Sturdy stainless steel structureS432/C/OPTOxygen and temperature sensor with OPTICAL technology Measurementand ControlMeasurementand Control4293 Chlorine and other oxidantsDual parameter versions available4238-93 [pH/REDOX - Chlorine]4262-93 [Turbidity - Chlorine]4293-22 [Chlorine - Conductivity]4293-23 [Chlorine - Inductive cond.]4293-93 [Chlorine - Chlorine]chosen from Free, Total, Dioxide, Ozone, PAA, H2O2Measuring rangefrom 0 to 100,000 ppm to be selected in relationto the type of sensor connectedS 494 Amperometric sensors with membraneAmperometric sensors with 2 or 3 membrane-covered electrodes with built-in temperature sensor for signal compensation.Assembly in a flow-through cell with constant flow (S305PX).Fields of application – Swimming pool, drinking, service, process water.– The sample should not contain surfactants. The pH value must be constant.Measurement – Amperometric system with two or three membrane-covered electrodes with internal electrolyte– Measuring range: >0.01 to <100,000 mg/l– Measurement error: ±2 % of the value read– Reproducibility: ±2 %– Stability: ± 1% of the analytical determination 4 weeks after calibrationWorking conditions – Speed of the sample on the membrane: 15 cm / sec– Hydraulic feed flow: 30..40 l/h, constant– Acceptable overpressure: 1 bar– Operating temperature: > 0 to 45 °C (others on request)– Temperature compensation: automatic via built-in NTC sensorTime – First polarisation: 1 h– Re-polarisation: 10 min– Response: T90: approx. 30 sec.Point calibration – Zero: not necessary – Work: as needed by the user, through analytical determination (colorimetric with DPD)Materials – Sensor body: PVC, silicone, PTFE– Membrane: semi-permeable PTFE (Teflon)– Electrolyte solution: aqueous containing potassium chloride – Measuring electrode: Gold (cathode)– Reference electrode: (Anode): silver/halogenated silverDimensions – Diameter approx. 25 mm / Length approx. 175 mmWarnings – Check electrolite status every 3 to 6 months – Electrolyte solution lifespan: approx. 1 yearTechnical dataMeasurementand ControlParameter Measuring range Operating pH rangeFree chlorine• 0,01…0,50 ppm • 0,01…2,00 ppm• 0,01…5,00 ppm • 0,01…10,00 ppm• 0,01…20,00 ppm • 0,1…200,00 ppm5.5 … 7.2Total chlorine• 0,01…0,50 ppm • 0,01…2,00 ppm• 0,01…5,00 ppm • 0,01…10,00 ppm4 … 12Free organic and inorganic chlorine• 0,01…2,00 ppm • 0,01…5,00 ppm• 0,01…10,00 ppm4 … 9.5Chlorine dioxide• 0,01…0,50 ppm • 0,01…2,00 ppm• 0,01…10,00 ppm2 … 11Ozone• 0,01…0,50 ppm • 0,01…2,00 ppm• 0,01…5,00 ppm • 0,01…10,00 ppm2 … 11Peracetic acid• 0…200 ppm • 0…500 ppm• 0…2000 ppm • 0…5000 ppm• 0…20000 ppm2 … 11Hydrogen peroxide• 1…200 ppm • 1…500 ppm • 1…2000 ppm • 1…10000 ppm• 1…50000 ppm • 1…100000 ppm 2 … 11Chlorites • 0,02…0,50 ppm • 0,10…2,00 ppm 6.5 … 9.5S305PX494Flow-through electrode holder for chlorine, chlorine dioxide,ozone, chlorite, PAA, H2O2 etc. membrane sensorsMaterials – Plexiglas cell and fixing brackets– PVC fittings and valves– Stainless steel float– NBR O-ringWorking conditions – Max operating temperature: 60 °C– Max operating pressure: 4 barLiquid inletTemperature sensor(OPTIONAL)Proximity sensor:Stainless steel float sensorProbe clamping ring nutChlorine detection probeLiquid outletSample tapCylinder head screw forgroundingFlow regulatorGEBCDHABCDEFFGHILAILMeasurementand ControlTechnical data4261 TurbidityDual parameter versions available4261-93 [Turbidity - Chlorine]4261-22 [Turbidity - Conductivity]Turbidity0.00 to 10.0 NTU ; 0.0 to 100 NTU ;0 to 1000 NTUResolution 0.1 NTU; 1 NTUMeasuring rangeApplications• Measuring turbidity in primary water upstream oftreatment plants, industrial or recirculating water• Measuring turbidity in waste water leaving the treatmentplantCharacteristics and advantages• Reliable measurement of concentration through the use ofan optical measurement process without contact with thesample• 90° scattering method compliant with ISO 7027 / EN27027 with visible light beam• Black rigid PVC sensor body• Built-in debubbler device• No moving mechanical parts• Measurement pre-processed in the sensor which provideshigh sensitivity in low-signal transmission• Fast calibration using the pre-calibrated calibration plate,supplied with the instrument.Nephelometric measuring cell Measuring method 90° scatteringMeasuring ranges 0…10, 0…100, 0…1000 NTUto be selected from the keypadPrecision ±3% of the f.s.Repeatability 95 %Response time 2 minutes for 90% of the f.s.Calibration by known pointMaterials in contact with the liquid PVCMaximum pressure 2 barFlow Rate min. 60 l/h - max. 300 l/hSample temperature 0…50 °C Ambient humidity 5…95% non-condensingLength of outgoing cable 10 mPower supply 12…24VDCMeasurementand ControlTurbidity0.00 to 1.00 NTU ; 0.0 to 10.0 NTU ; 0 to 100 NTUResolution 0.01 NTU; 0,1 NTU; 1 NTUMeasuring ranges from 0.00 to 100 FTUMax pressure 6 barMax temperature 45°CMaterials Black PVC body with threaded fittings 2 ½”F - Transparent PVC inspection windowsProjector and sensors positioned at 18 ° mounted on PVC flanges with connector for electrical connectionsSupplied 2 x 5 m cables with quick connectorS462/PVCMeasuring ranges from 0.00 to 100 FTUMax pressure 6 barMax temperature 90°CMaterials Stainless steel body with threadedfittings 2 ½” M - PTFE lining black -Tempered glass inspection windowProjector and sensors positioned at 180 ° mounted on stainless steel316 flanges with integral 5 m outgoing cableS462/INOXS462 Turbidimetric cellsS462 turbidimetric flow-through measuring cells. The measuringprinciple is the deviation of light produced by the particlessuspended in the liquid. Thanks to the dual sensor system, turbiditycan be measured at low and very low concentrations with highlevels of precision and repeatability. The absence of contact withthe measuring liquid and the optical LED technology make thesystem stable over time and minimise the need for re-calibrations.The cell can be installed directly in-line. The maximum allowablepressure is 6 bar, or on bypass piping. The flow rate does not affectthe measurement.Applications• Water treatment plants, on leaving the filtration or decantationsections.• Waste water refining plants for agricultural or industrial reuse.• Food industry, in particular in the production of beverages,wine, beer etc.• Swimming pools water.Turbidimetric probewith AISIS462/stainless steel body[for 4264 series only]Turbidimetric cell with PVCS462/PVC body4262/4264 TurbidityDual parameter versions available4262-83 [Turbidity - Dissolved oxygen]4262-93 [Turbidity - Chlorine]Measuring rangeMeasurementand ControlMeasuring rangeTurbidity0.0 to 4.00 NTU ; 0.0 to 40.0 NTU ;0 to 400 NTU ; 0 to 4,000 NTUResolution 0.01 NTU ; 1 NTUSuspended solidsfrom 0 to 9999 g/l to be selected in relationto the type of probe connectedS461 Submersible turbidity/SS probesMaterials Stainless steel 316Special glass lensViton O-ringThreading 1” GASMeasuring range S461/T 0 to 4/40/400/4000 NTUS461/S 30 gr/lMeasuring method 90° scattering/Light absorptionAccuracy ± 3% of f.s.Repeatability 98 %Calibration by pointsTemperature 0 to 60 °C Maximum pressure 4 bar Protection rating IP68 (cable included)Cable length 10mPower supply 12 to 24VDCOutputs RS485 Dimensions Ø 42 x 230 mmTechnical data4263 Turbidity & suspended solidsThe S461 sensor is used for the optical measurement ofturbidity in pure and process water up to 4000 NTU or todetermine the concentration of sludge up to 20g/l.Applications• Measuring turbidity in waste water• Measuring turbidity in primary water, industrial water,recirculation water• Measuring the concentration of sludge in biological watertreatment plants and industrial water.Characteristics and advantages• High level of reliability of the measurement thanks to the useof optical infrared technology (880 nm)• 90° scattering method for turbidity and absorption(according to Beer-Lambert) for suspended solids• Stainless steel 316 sensor body• No moving mechanical parts• Measurement pre-processed in the sensor which provideshigh sensitivity in low-signal transmissionProbe for suspended solidsS461/STurbidity probe S461/TDual parameter versions available4263-83 [Suspended solids - Dissolved oxygen]4263-93 [Suspended solids - Chlorine]7520 SAV-T/EThe 7520SAV and 7540SRH probes are used to determine high andvery high concentrations of suspended solids, up to 150g/l.Applications• Measuring the concentration of sludge in biological water treatmentplants: primary sludge, thickened sludge, recirculation sludge,feeding press belts/centrifuges.• Measuring the concentration of suspended solids in extraction systems:quarries, tunnels, aggregate extraction.Characteristics and advantages• Reliable measurement thanks to infrared optical measurements at880 nm• Dual pulsed light beam system to compensate for drift from opticalcomponents.• Stainless steel sensor body• No mechanical moving part• Digitised signal inside the probe body, reducing the possibility ofelectrical interference in the signal transmissionTechnical data7520 SAV-T/E • 7540 SRH-T/EProbes for high concentrationsMechanical specifications Dimensions (L x Ø) submersioninsertion139 × 38 Ø mm (7520 SAV)134 × 38 Ø mm (7540 SRH)220 × 38 Ø mmWeight submersioninsertionapprox. 1 kgapprox. 3 kgMaterials Sensor body AISI 316 TiIndicator light EpoxyO-rings Viton®Working condition Temperature 0 ... +50°CPressure max. 6 barProtection rating IP 68Measurement Measuring principle Light absorption (7520 SAV)Back radiation (7540 SRH)Optical components Light source: 2 LEDs, detectors: 2 photodiodesLight measurement Infrared light at 880 nm (maximum absorption)Measuring range 0…70 g/l in relation to the type of sludge (7520 SAV)10…150 g/l in relation to the type of sludge (7540 SRH)Accuracy ± 1% of the f.s.Repeatability 99.5 %Cable length T versionE version13 m1 m + 10 m extension cableCalibration with silica as standard7540 SRH-T/EMeasurementand Control