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Turbidity meter with infrared light source ( EN ISO 7027) Highlights Range from 0.01 – 1100 NTU Measurement with infrared light at an angle of 90° Measurement of coloured liquids Easy handling 600 tests without battery change Description AL250T-IR The compact AQUALYTIC infrared turbidity meter AL250T-IR is designed to allow fast, precise on-site testing. The unit measures the scattered light at an angle of 90° , as stipulated in EN ISO 27 027. The wide measuring range from 0.01-1100 TE/ F = NTU = FNU makes the instrument suitable for various applications, ranging from drinking water to waste water. Technical data - Measurement cycle approx. 8 seconds - Display backlit LCD ( on keypress) - Optics temperature-compensated LED and photosensor amplifier in water proof sample chamber, infrared light - Keypad polycarbonate membrane, splash proof - Power supply 9 V power pack battery - Auto - OFF automatic switch-off - Storage internal ring memory for 16 data sets - Additional feature real time clock and date - Range 0, 01 - 1100 NTU ( Auto-range) - Resolution 0.01 - 9.99 NTU = 0.01 NTU 10.0 - 99.9 NTU = 0.1 NTU 100 - 1100 NTU = 1 NTU - Accuracy ± 2, 5 % of reading or ± 0.01 NTU ( 0 - 500 NTU) ± 5 % ( 500 - 1100 NTU) - Housing ABS - Dimensions ( L x W x H) 190 x 110 x 55 mm - Weight approx. 0.4 kg ( base unit) - Ambient conditions Temperature: 5 – 40 ° C rel. humidity: 30 – 90% - CE-conformity Â