Partech Products Sludge Blanket Sensors
Sludge Blanket Sensors
Soli-Tech 20v2 and IR Sensors
Partech offer a selection of sensors that for use in conjunction with our range of Sludge Blanket monitoring instruments. All the sensors use infrared attenuation as their operating principle, this makes them sufficiently sensitive for use on thin water treatment sludges as well as the more usual sewage treatment applications.
When monitoring the Sludge Blanket Level in settlement tanks it is important to ensure that the sensor is sensitive enough to detect low density solids before 'carry-over' to the next process stage occurs, ensuring that potential pollution events are highlighted before they occur. At the same time the sensor should not be 'blinded' by solids in the supernatant. Advice on sensor selection is included in the brochure and our engineers are available to provide further advice if required.

Soli-Tech 20v2 Sensors: available in 3 ranges, these sensors benefit from a machined housing and offer excellent resistance to temperature and chemical attack.
Infrared Sensors: available in 4 ranges, these sensors are preferred when fouling of the sensor 'gap' is an issue and are easier to clean.
The sensors shown are supplied with the 8100 and 8200 Monitors to provide an alarm for high sludge blanket level and with the ASLD 2200 to provide a continuous output signal.
Technical Specification
Physical
| Weight | Infrared Sensors: 0.35 kg |
| | Soli-Tech2 20v2 Sensors: 0.7 kg |
| Dimensions (hxwxd) | IR100 Sensors: 95 x 160 x 25 mm |
| | IR40 Sensors: 95 x 100 x 25 mm |
| | IR15/8 Sensors: 95 x 75 x 25 mm |
| | Soli-Tech 20v2 Sensors: 247 x 73 x 30 mm |
| Enclosure Rating | IP68 |
| Material of Construction | Infrared Sensors: Epoxy Resin Moulded Body |
| | Soli-Tech 20v2 Sensors: Black Acetal Co-Polymer |
| Cable Entries | Integral Cable Gland |
| Cable Type | 3 core, 5mm O/D, Polyurethane Coated |
| Cable Length | 10 metres standard, 100 metres maximum |
Environmental Data
| Operating Temperature | 0 - 50ºC |
| Storage Temperature | -20 to 60ºC |
| Location | Indoor or Outdoor |
| Pressure Rating | 10 mWC |
Interface to Monitor
| Sensor Output | Pulse Width Modulation |
| Power | 12 VDC from Monitor |
Measurement Principal
| Principal of Operation | Light Attentuation |
| Wavelength | 960 nm Infrared |
Measurement Characteristics
| Accuracy | +/- 10 mm |
| | Accuracy will depend on the settling characteristics of the solids and can vary during operation of the plant |
| Flowrate | Not affected by flowrate |
Sensor Selection
| IR100 Sensor | Special Applications Only |
| IR40 Sensor | WTW Clarifier, STW Final Settlement |
| IR15 Sensor | WTW Thickener, STW Primary Settlement |
| IR8 Sensor | STW Thickener |
| | |
| Soli Tech 20v2 Sensor 0-200 | Special Applications Only |
| Soli Tech 20v2 Sensor 0-1,500 | WTW Clarifier, STW Final Settlement |
| Soli Tech 20v2 Sensor 0-10,000 | WTW Thickener, STW Primary Settlement |
| Soli Tech 20v2 Sensor 0-30,000 | STW Thickener |
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