Self cleaning turbidity sensors with analog output
turbidity sensor,turbidimeter FEATURES:
  • Reliable concentration measurement using optical measuring process
  • Signal preprocessing in sensor
  • Rugged stainless steel sensor body
  • Temperature and ambient light compensation
  • Quartz Glass
  • Built in wiper to keep sensing surfaces clean
  • Isolated 4-20mA output
Turbidity Sensors Product Description

Turbidity Sensor Measuring principle
Low turbidity is measured by scattered light.  The number of suspended particles corresponds to the intensity of scattered light.  In order to ensure that different measuring instruments will yield comparable results, the standard ISO 7027 (DIN 38404) was drawn up, stipulating 90 measurement for turbidity (FNU).

Turbidity Sensor Design
The turbidity sensors process an analog signal 420 mA which is supplied by the turbidity sensor's electronics after compensation of temperature and ambient light.  A mechanical wiper prevents contamination of the turbidity sensor's measuring windows.  The wiper cycle is controlled by an extern contact and allows you to match the turbidity sensor's cleaning cycle to your application.  Preprocessing the turbidity sensor's measurement signal directly in the probe allows the turbidity probe and analyser to be extended by up to 656 feet (100m).  The heavy duty WQ750, turbidity sensors are constructed of 316 stainless steel with scratch resistant quartz optical lenses to provide a long, dependable service life.  The turbidity sensors will even work in seawater with no issues.  The turbidity sensors ships complete with 42 feet of cable and wiper actuation board.

Turbidity Sensor Installation
Reflections from stationary installations in the area of the turbidity sensor (e.g. wall, ground) can affect turbidity measurements at low turbidity levels, causing the turbidity sensor to give false high turbidity values.  It is important to take account of this when performing turbidity sensor control measurements in small vessels.  The distance between the turbidity sensor probe and the next wall should be large enough to avoid reflections, see the diagram below.

Turbidity Sensor Installation


Required mounting clearances


Turbidity Sensors Applications

  • Filtration monitoring
  • Condensate monitoring
  • Industrial water monitoring
  • Final effluent of wastewater treatment plants
  • Industrial quality control
  • and MUCH MORE...

Turbidity Sensors Specifications

Turbidity Sensors Diagram

Measuring principle: 90-scattered light with pulsed infrared light, according to ISO 7027 (DIN 38404)
Wavelength: 880 nm
Measuring range: 1-1000 FNU
Maximum error: < 1% of measuring range
Repeatablility: <1%
Analog output: 4-20 mA Isolated
Signal filter: 10 sec.
Control signal for wiper: pulse duration 5 sec. / O V

Power: 1024 VDC
Sensor current: ~220mA @ 12 VDC
Wiper current: 50 mA

Operating conditions
Temperature range: 0-50 C (32-122 F)
Operating pressure max.: 6 bar (87 psi) maximum

Sensor body: Stainless steel 1.4571 (SS 316 Ti)
Wiper: Rubber
Optical windows: Quartz glass
Cable: 22 AWG 7 conductor with aluminum foil/tinned copper wire shield
Cable length: 42.5 ft (15m) Size: 1 1/2in D x 5.75in L (38mm D x 146mm L)
Weight: 2 lbs.

Turbidity Sensors Options

WQ750-1000 Self Cleaning Turbidity Sensor
42' standard cable length.
Turb 430T Portable Turbidity Meter Kit (EPA)
Includes calibration kit (0.02 - 10 - 1000), 2 empty cuvettes, cleaning tissues, batteries (4 x AA), and field case with table insert.
  portable turbidity meters kit
TC-3000e Portable Chlorine Meter
Measure Chlorine, Turbidity, and Color in one meter.
U-10-2 Multiparameter Probe
Measures pH, Conductivity, Dissolved Oxygen, Turbidity, Salinity, and Temperature.
WQS-STD Turbidity Sampling System
NOTE: Turbidity sensor is not included.
  Turbidity Sampling System
Global Water's other water quality sensors.  

GL500 Wind Speed Recorder
Wind Speed recorder for sensor datalogging.  Includes Global Logger Software.  With weather proof enclosure and 12V battery.


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