GLOBAL WATER WQ770B Portable Turbidity Meter

Turbidity Sensor Global Water' s Turbidity Sensor is a highly accurate submersible instrument for in-situ environmental or process monitoring. Applications for the turbidity sensors 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.

In accordance with USEPA Method 180.1 for turbidity measurement, the Turbidity Sensors are a 90 degree scatter nephelometer. The turbidity 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 the turbidity sensor' s photodetector positioned at 90 degrees to the light beam. The light intensity detected by the turbidity sensor is directly proportional to the turbidity of the water. The turbidity sensors utilize a second light detector to correct for light intensity variations, color changes, and minor lens fouling. For environmental or process monitoring, simply place the turbidity sensor directly in the water and position it where the turbidity is to be monitored. Since the turbidity sensor uses light to detect the water' s turbidity ensure that the minimum amount of external light possible is exposed to the monitoring site.

Turbidity Meter The Global Water Turbidity Meter combines the turbidity sensor ( described above) with a handheld meter that has a six digit LED screen, 4-button control panel, and an internal 9V battery. The handheld portable turbidity meter can be used for enivronmental or process sites that do not require permanent monitoring. The turbidity meter will display readings directly in either nephelometric turbidity units ( NTU) or parts per million ( PPM) . The turbidity meter also includes an automatic shutoff feature to conserve battery power.

Turbidity Sensor Cleaning and Use To maintain accurate readings with your turbidity sensors the lenses should be cleaned a minimum of once per week. Depending on the monitoring site, the turbidity sensor' s lenses may need to be cleaned as much as once per day. The turbidity sensor has been designed for harsh field conditions and uses the latest manufacturing design technology, however in applications where constant monitoring is needed, Global Water recommends that the turbidity sensor should not be kept submerged for more than one month at a time.

Specifications: 
Range: Sensor= 0-50 NTU and 0-1000 NTU; Meter= 0-50 NTU or 0-1000 NTU selectable
Accuracy: + 1% of full scale
Meter Resolution: 12 bit
Output: 4-20mA ( Sensor, both ranges) , LED screen ( Meter) 
Method: Nephelometer with correction
Operating Voltage: 10-36 VDC @ 40 MS ( Sensor) ; Internal 9VDC battery ( Meter) 
Current Draw: 30 mA plus sensor output ( Sensor) 
Warm-up Time: 5 seconds minimum ( Sensor) 
Operating Temperature: 14 to 122° F ( -10 to + 50° C) ( Sensor) ; 32 to 122° F ( 0 to + 50° C) ( Meter) 
Materials: 306 stainless steel, delrin, polyether jacketed cable.
Maximum Pressure: 30 psi
Light Source: Infrared LED, ( 880nm) 
Cable Length: Sensor= 25 ft standard ( optional to 500 ft) 
Size: Body= 1 1/ 2 x 8.5 inches ( 3.8 x 21.6 cm) ( Dia x Length) 
Weight: 1lb ( 454 g) ( Sensor) ; 2 lbs ( 907 g) ( Meter+ sensor)