Hydrolab has equipped this unique turbidity sensor with patent pending shutter technology, ambient light rejection, and scratch resistant optical surfaces. Hydrolab's shutter technology utilizes a different paradigm than wiper technologies already on the market. Wiper technologies allow fouling of the optical surfaces between samples and attempt to wipe the sensor clean with one or more strokes, similar to a wiper on a dirty windshield. Unfortunately, wipers nick during operation and streaks develop on the optical surfaces.
Further damage occurs when sand and grit scratch the optical surfaces on a wiping cycle.
Streaked and scratched optical surfaces do not provide quality turbidity measurements. Shutter Technology Operation Hydrolab's patent pending shutter technology uses a different approach. The shutter covers the optical surfaces between samples and opens only during measurements. Hydrolab's shutter technology avoids fouling the optical surfaces between measurements which, for most applications, far exceeds the- measurement time. Hydrolab's shuttered turbidity sensor employs synchronous modulation of an infrared LED to provide accurate turbidity measurements in all sunlight conditions at any depth.