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Specifications Nephelometric or transmittance measuring - The nephelometric measurement at 90° scattered light is advantageous for lower turbidity, whereas the transmission measurement at 180° is beneficial for medium to high turbidity values: With increasing turbidity, restray and scattering effects between particles are growing bigger. The reduction of light intensity in this case leads to a more accurate result than a 90° nephelometric measurement. Therefore, lab meters for high values are equipped with several measuring options: Ratio modes calculate the final result from different measured angles. For ratiometric measurements, there is no specific standard method to be followed; rather, procedures are established by the application or industry.White light has a higher sensitivity for small particles, however, the inherent coloration of the solution has a stronger disturbing effect in this case. The IR measurement is required by DIN ISO, the white light measuring by US EPA.Application areas for turbidity measuring Turb® 355 T/IRTurb® 430 T/IRTurb® 550/Turb® 550 IRTurb® 555/Turb® 555ApplicationsPortable use for waste-water, surface water and ground water applicationsPortable use for all water testing applications incl. drinking water, wine industry, process control Laboratory use: optional for all applica-tions up to 1100 NTU/ FNU with LabStationMeter for routine and precise measurementsMeter for routine and precise measurements including QC of com-plex samples and high turbidity values.Light sourceTungsten lamp/IR LEDTungsten lamp/IR LEDTungsten lamp/IR LEDTungsten lamp/IR LEDMeasuring range0-1100 NTU/FNU0-1100 NTU/FNU0-1000 NTU/FNU0-10000 NTU/FNU/FAUCalibrationAutomatic 1-3 pointAutomatic 3 pointAutomatic 1-3 pointAutomatic 1-5 pointSpecial featuresPortable field meterPortable field meter Calibration interval Calibration documentation Storage for measure values Optional: LabStation, LSdataAQA Flow-through measurement (unpressurized)AQA complete with password protection, ratio method for the reduction of interferences; transmission, flow-through measurement (unpressurized/ up to 4 bar)Benchtop Turbidimeters Turb® 550Turb® 550 IRTurb® 555Turb® 555 IRMeasuring principlesNephelometric Nephelometric Light sourceTungsten lampIR-LEDTungsten lampIR-LEDMeasuring range NTUFNUEBCNephelosFAU0 ... 1000––––0 ... 10000 ... 1000–––0 ... 10000–0 ... 24500 ... 67000–0 ... 100000 ... 100000 ... 2450–0 ... 10000Resolution0.01 NTU from 0.00 ... 9.990.1 NTU from 10.0 ... 99.91 NTU from 100 ... 10000.0001 NTU from 0.0001 ... 9.9999 NTU0.001 NTU from 10.000 ... 99.999 NTU0.01 NTU from 100.00 ... 999.99 NTU0.1 NTU from 1000.0 ... 9999.9 NTUAccuracy±2% of value or ±0.01 NTU0 ... 1000 NTU: ±2% of value or ±0.01 NTU1000 ... 4000 NTU: ±5% of value4000 ... 10000 NTU: ±10% of valueReproducibility±1% of value or ±0.01 NTUCalibrationAutomatic 1...3 point calibrationAutomatic 1...5 point calibrationResponse time< 3 seconds< 6 secondsCuvettes28 x 70 mm (1.1 x 2.76 in) round cuvette, 25 ml sample volumeAQA functionsCalibration interval monitoringCalibration protocolCalbration interval monitoringCalibration protocolPassword-protected access to calibration and configurationTime-controlled data transmissionOperating temperature+10 ... +40 °C (50 … 104 °F)0 ... +50 °C (32 … 122 °F)Power supplyPlug-in power supply 100 - 240 VAC ±10% / 47 - 63 HzPortable Turbidimeters Turb® 430 IR / Turb® 430 TTurb® 355 T / 355 IRMeasuring principlesNephelometric (90° scatter)Nephelometric (90° scatter)Light sourceIR-LED/Tungsten lampTungsten lamp/IR-LEDMeasuring range NTUFNU0 … 1100 / 0-11000 … 11000 … 11000 … 1100Resolution0.01 from 0.00 … 9.990.1 from 10 … 99.901 from 100 … 11000.01NTU from 1 … 9.990.1 NTU from 10.0 ... 99.91 NTU from 100 ... 1000Accuracy0.01 NTU or ±2 % of the measured value±2 % of the measured value or ±0.1 NTUlast decimal place in range 1 … 500 NTU±3% of the measured value in range 500 … 1100 NTUReproducibility<0.5% of the measured value or 0.01 NTU/FNU±1% of the measured value or ±0.05 NTU/FNUCalibrationAutomatic 3 point calibrationAutomatic 1...3 point calibrationResponse timeApprox. 3 seconds (IR) / approx. 7 seconds (T)14 secondsCuvettes28x60 mm (1.10x2.36 in.), 20 ml sample vol25x45 mm (0.98x1.77 in), 15 ml sample volInterfaceRS 232, USB via adapterSpecial FunctionsCalibration ProtocolStorage; measured valueRS 232Date/TimeData evaluationRechargeable batteryYes1000YesYesYesOptional——————Operating temp.0.. +50 °C (32..122 °F)0..+50 °C (3..122 °F)
