Envco – Environmental Equipment

Applications include: water quality testing and management, river monitoring, stream measurement, reservoir water quality testing, groundwater testing, water and wastewater treatment, and effluent and industrial control.

• Simple and convenient to use
• Marine grade cable with strain relief
• Rugged anodized aluminum sensor housing
• Removable light and debris shield

In accordance with USEPA Method 180.1 for turbidity measurement, the Turbidity Sensor is a 90 degree scatter nephelometer. The sensor directs a focused beam into the monitored water. The light beam reflects off particles in the water, and the resultant light intensity is measured by a photodetector positioned at 90 degrees to the light beam. The detected light intensity is directly proportional to the turbidity of the water. The turbidity sensor utilizes a second light detector to correct for light intensity variations, color changes, and minor lens fouling.

Turbidity sensor specifications

Output: 4-20mA
Range: 0-50 NTU (Green Wire) 0-1000 NTU (White Wire)
Accuracy: 2% of full scale
Power Requirements:10-36VDC
Warm Up Time:10 seconds minimum
Operating Temperature: -40 to +50C
Size of Probe: 1 1/2" diameter x 9" longWeight: 1 lb.The cable connection of the sensor is as follows:

Red: 12V
Black: Ground
Green: 4-20 mA low range output (50 NTU)
White: 4-20 mA high range output (1,000 NTU)

The sensor is factory adjusted and will provide output currents at the maximum turbidity values close to 20 mA.

Typical values are:
1,000 NTU range: 18 to 20 mA
50 NTU range: 17 to 20 mA

Ordering Information
WQ720 Turbidity Sensor 25 foot standard cable length
WQ770-b Turbidity Meter Includes turbidity sensor on 25 foot standard cable length.
WQEXC Extra Cable Over included cable length, up to 500 foot.