Arduino shield for critical, accurate, robust and non-contact turbidity measurements

Analog Devices EVAL-CN0409-ARDZ Arduino Shield uses the ADPD105 photometric front end and a network of 860nm Infrared emitters and silicon PIN photodiodes to produce a water turbidity measurement system. The system can measure low to high water turbidity levels ranging from 0FTU to 1000FTU. The IR LED, and photodiode network is managed in such a way that it can carry two of the most recognised turbidity measurement standards – ISO7027 (both ratio and non-ratio) and GLI Method. With three-point calibration, the typical accuracy that the system can attain is ± 0.50 FTU or ±5% of the reading – whichever is greater. This accuracy coupled with the 0.05FTU noise level makes the measurements acquired using this system very reliable. The device’s ambient light rejection feature makes this circuit perfect for applications where robust, accurate, and non-contact turbidity measurements are critical. Typical applications include chemical analysis and monitoring of natural bodies of water, wastewater and drinking water.