*The probe is shipped factory calibrated (zero and slope). ** The probe temperature sensor monitors the LED temperature and compensates for LED’s thermal behavior. The sensor does not give a direct measurement of water temperature. HI7660-28 measurement specifications Turbidity Range 0.000 to 4.000 FNU 0.00 to 40.00 FNU 0.0 to 400.0 FNU Resolution 0.001 FNU 0.01 FNU 0.1 FNU Accuracy 0.000 to 4.000 FNU 0.05 ± 2% reading 0.00 to 40.00 FNU 0.3 ± 2% reading 0.0 to 400.0 FNU 2.0 ± 2% reading Calibration* Factory calibration (default) Single solution (determine slope) Two points (determine slope and offset) Calibration timeout Off (default) 1 to 99 days Additional Specifications Averaging samples 1 to 60 samples (default,1 sample) Temperature Compensation Automatic, 0.0 to 50.0 °C (32 to 122 °F) Temperature source Automatic (from probe) Operating temperature −5 to 50 °C (23 to 122 °F) Temperature accuracy** ±0.6 °C (1 °F) Repeatability 2% Protocols MODBUS RTU HI7660-28 sensor specifications Sensor Light source Infrared LED Light detector Photodiode for turbidity measuring HI7660-28 general specifications Body Type PVC Length 115 mm (without cable gland) Diameter 39.5 mm Probe weight 190 g Cable weight 10 m › 480 g 5 m › 240 g 2 m › 96 g Total weight Probe with 10 m cable › 670 g Probe with 5 m cable › 430 g probe with 2 m cable › 286 g Operating pressure 0 to 6 bar @ 25 °C (77 °F) 0 to 3 bar @ 50 °C (122 °F) Protection rating IP68 Cable length zz, see Series configuration Ordering Information Each HI7660-28 probe is supplied with quick reference guide and probe quality certificate Choose your configuration: 2 Turbidity sensor 8 Smart probe with RS485 connection zz 02, 05, 10 fixed cable length (dimension expressed in meters) HI7660— 2 8 z z Dimensions 115 mm (4.53”) 85 mm (3.34”) 140 mm (5.51”) Ø39.5mm (3.34”) 15 mm (.59”) Inlet/outlet tube Probe adapter Locking collar Wall-mounting bracket HI7660-28 probe shown with HI7676602 ºow cell accessory for measurements below 40 FNU. See following pages for more information. 15 Process Instrumentation 15.59 www.hannainst.com | controllers
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