IQ turbidity sensor  VisoTurb 700 IQ WTW Germany

VisoTurb®: Optical turbidity sensors according to nephelometric principle according to EN ISO 7027 for the in-situ use in water/wastewater with ultrasonic cleaning system:

• Ultrasonic cleaning without mechanics
• Extremely low-maintenance
• Highly accurate factory calibration
• High operational safety (sensor check function)

The ultrasonic cleaning system ensures the low-maintenance and continuously reliable measuring operation of the sensors, which are therefore very suited for extreme applications, such as wastewater treatment plants.

With the nephelometric measuring principle of the VisoTurb®, the stray light is measured at a 90° angle. The measuring setup is suitable for low and medium turbidity values up to 4000 FNU. According to EN ISO 7027, infrared light is used in the wavelength range of 860 nm. This wave length is outside the visible range, so that possible sample colorings generally do not cause any interference.

The sea water model includes the sensor for use in special media: All wetted parts are made of titanium and plastic and are therefore extremely resistant to corrosion.

Specification :

• • Model	VisoTurb® 700 IQ	VisoTurb® 700 IQ SW*
    Order No.	600010	600011
    * SW: Sensor as sea water model (with plastic arming (POM))
    Measuring method	Nephelometric principle in compliance with EN ISO 7027
    Measuring range
    FNU; NTU; TEF	0.05 ... 4000 FNU
    mg/l SiO2; ppm SiO2	0.1 ... 4000 mg/l SiO2
    g/l TS	0.0001 ... 400 g/l TS
    Resolution
    FNU; NTU; TEF	Automatic according to measuring range 0.001 ... 1 FNU
    mg/l SiO2; ppm SiO2	0.001 mg/l ... 0.01 g/l
    g/l TS	0.001 mg/l … 1 g/l
    Accuracy	Process variation coefficient according to DIN 38402 part 51 <1 % (in the range up to 2000 FNU) Repeatability according to DIN ISO 5725 or DIN 1319 < 0.015 % or ≥ 0.006 FNU
    Calibration
    FNU; NTU; TEF	Factory calibration with formazine
    mg/l SiO2; ppm SiO2	Factory calibration with SiO2
    g/l TS	Calibration by user, (TSS regulations in compliance with DIN 38414)
    Cleaning System	Ultrasound cleaning system
    SensCheck	Contamination detection of optical window; failure of cleaning system
    Pressure Resistance	10 bar (incl. sensor connection cable)	Maximum 2 bar
    Ambient Conditions	Operating temperature: 32 ... 140 °F (0 ... 60 °C); ultrasonic cleaning system: 32 ... 104 °F (0 ... 40 °C) (overheating protection); Storage temperature: 23 ... 149 °F (-5 ... +65 °C)
    Electrical connections	2-wire shield cable with quick fastener to sensor
    Electromagnetic Compatibility	EN 61326, Class B, FCC Class A; Intended for indispensable operation
    Certifications	CE	CE
    Mechanical	Measuring window: Sapphire; Sensor body: V4A stainless steel 1.4571; Protection rating: IP 68	Measuring window: Sapphire; Sensor body: Titanium, POM; Protection rating: IP 68
    Weight (without cable)	Approx. 2.18 lb (900 g)	3.13 lb (1420 g)
    Warranty	2 years for defects in quality