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SoliTechw² IL Suspended Solids and Sludge Density Sensor

Inline Sensor for sludge density, suspended solids and turbidity monitoring

The SoliTechw² IL sensor provides reliable and repeatable, continuous in-line measurement of sludge density, suspended solids and turbidity.  The optical element has a sapphire window, this offers excellent resistance to fouling and damage caused by the abrasion from flow particles.

The sensor is suitable for a variety of applications including the auto de-sludging of primary and final settlement tanks, and reliable sludge density measurement ensures that downstream treatment processes can operate at their optimum level.

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  • Overview
  • General Specification
  • Measurement Specification
  • Ordering Information & Spare Parts

The sensor uses infrared back-scatter at 960nm, the light is transmitted and received through a lens that is optically split. The infrared measurement principle allows the sensor to work in applications where entrained air prevents the use of ultrasonic sensors.

The sensor is installed through a mounting boss onto any pipeline that is larger than 65 mm diameter. The sensing element is positioned flush with the inside wall of the pipe, ensuring that the optical surface is kept clean by the flow passing the sensor and making sure the sensor does not cause an obstruction to the flow.

When detecting turbidity the sensor can give immediate warning of a filter failure or of contamination of a process by suspended particles. The sensor is also well suited to the monitoring of sludge at tanker intake points, giving an excellent indicator of the strength of the incoming liquor allowing both process adjustments and the charges to be applied to the tanker operator.

Dimensions (hxwxd)310 mm long
Weight3.9 kg (inc 10 metres of cable and ball valve)
Enclosure RatingSensor Body: IP65
Optical Housing: IP68
Enclosure MaterialBlack Acetal Co-Polymer
Cable EntriesIntegral Cable via Cable Gland
Wetted Parts316 Stainless Steel, Sapphire
Cable Type4 core, 2 Twisted Pair, 5 mm O/D Polyurethane Coated
Cable Length10 metres standard, 100 metres maximum
Service RequirementNo routine servicing
Will require manual cleaning frequency application dependent
Environmental Data
Operating Temperature0 to 60ºC
Interface to Monitor
Power Supply12 VDC from Monitor
Sensor OutputModTechw², RS485
Measurement Characteristics
Ranges0-50,000 mg/l, 0-50 g/l, or 0-5 %SS
Accuracy±5% of reading or ±250 mg/l, whichever is the greater
Measurement PrincipleBack Scatter
Wavelength960 nm Infrared
Pressure Rating2 Bar, avoid transient pressures
FlowrateNot affected by flowrate, avoid deadspots and extreme turbulence
UnitsUser Selectable mg/l, g/l, ppm, %SS, NTU
Part NumberDescription
223614SoliTechw² IL Sensor, 0-5% SS (Cable Length: 10 metres)
223890SoliTechw² IL Sensor, 0-0.5% SS (Cable Length: 10 metres)
Mounting Options
171300Mounting Boss - IL55BV2 (made to customer specifications)
TBAPipe Section - made to customer specification

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