Home > Sludge Blanket Measurement > Automatic Sludge Blanket Level Detector
The ASLD2200 is a fully automatic sludge blanket level detector designed for the water and waste water industry. It utilizes a servo-driven sensor which continually tracks the settled interface with the sensor at the very top of the interface zone.
Continuous monitoring of the sludge/water interface or sludge blanket is central to the efficient operation of clarifiers, thickeners and settlement tanks. Reliable measurement enables a control system to maintain the optimum depth of sludge in the tank. A sludge interface that is too high can result in pollution incidents caused by carry-over from a final settlement tank. The sludge can also become too thick to extract easily or can turn septic if left too long. If there is insufficient sludge in the tank the settlement process cannot operate correctly and the solids will tend to remain in suspension.
Our infrared sensors are ideally suited to monitoring the sludge/water interface even when the settlement process is not working effectively and the interface has become indistinct.
The ASLD2200 is supplied with a sensor that uses infrared attenuation as the principle of operation which allows Partech to ensure sufficient sensitivity to monitor sludge blankets in a wide variety of applications. It should be noted that sensor selection can be site dependent. Partech are happy to provide full support in the selection of the correct sensor.
The sensor will normally be positioned in the area of the tank just above the sludge and will therefore be kept away from the worst of the fouling that can occur in the treatment of either potable or dirty water. Provision must be made for transmission of the output signal to the control system; this is normally possible via spare slip rings. Where this is not possible a radio telemetry option is available, allowing transmission directly to the control system without the need for installation of cables.
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 prior to occurrence. At the same time the sensor should not be ‘blinded’ by solids in the supernatant.
| DIMENSIONS | 350 mm (13.8”) x 490 mm (19.3”) x 300 mm (11.8”) (H x W x D) | ACCURACY | ±100 mm Accuracy will depend on the setting characteristics of the solids can vary during operation of the plant |
| WEIGHT | 15 kg (33 lbs) | RESOLUTION | 0.01 mg/l |
| PROTECTION CLASS | IP55 Outer Enclosure with IP65 electronics housing | REPEATABILITY | ±1% of reading |
| ENCLOSURE MATERIAL GRP | Outer Enclosure with Polycarbonate inner | MEASUREMENT PRINCIPLE | Light Attenuation |
| CABLE ENTRIES | 3x M20 | WAVELENGTH / FREQUENCY | 960 nm Infrared |
| CABLE LENGTH | 10 meters (32 ft) standard | RESPONSE TIME | 0.5 seconds – damping provided by monitor |
| POWER SUPPLY | 85 to 264VAC 50/60 Hz Rating 25 VA | INSTALLATION TYPE | Handrail |
| STANDARD SENSORS | DIMENSIONS | WEIGHT | OPTICAL PATH | RANGE | CABLE LENGTH | SERVICE REQUIREMENT |
| IR8 Sensor | 95 (3.7”) x 8 (0.3”) x 25 (0.9”) mm | 0.7 kg (1.54 lbs) inc 10m of cable | 8mm | 0 – 30,000 | 10 meters (32.8 ft) standard | No routine servicing |
| IR15 Sensor | 95 (3.7”) x 15 (0.6”) x 25 (0.9”) mm | 0.7 kg (1.54 lbs) inc 10m of cable | 15mm | 0 – 10,000 | 10 meters (32.8 ft) standard | No routine servicing |
| IR40 Sensor | 95 (3.7”) x 40 (1.6”) x 25 (0.9”) mm | 0.7 kg (1.54 lbs) inc 10m of cable | 40mm | 0 – 1,500 | 10 meters (32.8 ft) standard | No routine servicing |
| IR100 Sensor | 95 (3.7”) x 100 (3.9”) x 25 (0.9”) mm | 0.7 kg (1.54 lbs) inc 10m of cable | 100mm | 0 – 200 | 10 meters (32.8 ft) standard | No routine servicing |
| SENSOR | TYPICAL APPLICATIONS | |
| IR100 – Range 0 to 200mg/l The sensor should only be used if the sludge is very ‘light’ with very clear supernatant. | Water Treatment | |
| IR40 – Range 0 to 1,500mg/l This is the most commonly used sensor and is suitable for use on final settlement tanks in sewage treatment applications and clarifiers in water treatment works. | Water Treatment Clarifiers Sewage Treatment Final Settlement Humus Tanks | |
| IR15 – Range 0 to10,000mg/l This sensor is also regularly used for sludge blanket detection and is normally used for primary settlement in sewage treatment and sludge thickeners in water treatment. | Water Treatment Sludge Thickeners Sewage Treatment Primary Tanks | |
| IR8 – Range 0 to 30,000mg/l This sensor should be applied on sludge thickeners in sewage treatment plants. | Sewage Treatment Thickeners | |
| Note: Sensor ranges and detection points are appoximate and depend on the site-specific nature of the treatment process. | ||
The ASLD2200 is a fully automatic sludge blanket level detector designed for the water and waste water industry. It utilizes a servo-driven sensor which continually tracks the settled interface with the sensor at the very top of the interface zone.
Continuous monitoring of the sludge/water interface or sludge blanket is central to the efficient operation of clarifiers, thickeners and settlement tanks. Reliable measurement enables a control system to maintain the optimum depth of sludge in the tank. A sludge interface that is too high can result in pollution incidents caused by carry-over from a final settlement tank. The sludge can also become too thick to extract easily or can turn septic if left too long. If there is insufficient sludge in the tank the settlement process cannot operate correctly and the solids will tend to remain in suspension.
Our infrared sensors are ideally suited to monitoring the sludge/water interface even when the settlement process is not working effectively and the interface has become indistinct.
The ASLD2200 is supplied with a sensor that uses infrared attenuation as the principle of operation which allows Partech to ensure sufficient sensitivity to monitor sludge blankets in a wide variety of applications. It should be noted that sensor selection can be site dependent. Partech are happy to provide full support in the selection of the correct sensor.
The sensor will normally be positioned in the area of the tank just above the sludge and will therefore be kept away from the worst of the fouling that can occur in the treatment of either potable or dirty water. Provision must be made for transmission of the output signal to the control system; this is normally possible via spare slip rings. Where this is not possible a radio telemetry option is available, allowing transmission directly to the control system without the need for installation of cables.
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 prior to occurrence. At the same time the sensor should not be ‘blinded’ by solids in the supernatant.
| DIMENSIONS | 350 mm (13.8”) x 490 mm (19.3”) x 300 mm (11.8”) (H x W x D) | ACCURACY | ±100 mm Accuracy will depend on the setting characteristics of the solids can vary during operation of the plant |
| WEIGHT | 15 kg (33 lbs) | RESOLUTION | 0.01 mg/l |
| PROTECTION CLASS | IP55 Outer Enclosure with IP65 electronics housing | REPEATABILITY | ±1% of reading |
| ENCLOSURE MATERIAL GRP | Outer Enclosure with Polycarbonate inner | MEASUREMENT PRINCIPLE | Light Attenuation |
| CABLE ENTRIES | 3x M20 | WAVELENGTH / FREQUENCY | 960 nm Infrared |
| CABLE LENGTH | 10 meters (32 ft) standard | RESPONSE TIME | 0.5 seconds – damping provided by monitor |
| POWER SUPPLY | 85 to 264VAC 50/60 Hz Rating 25 VA | INSTALLATION TYPE | Handrail |
| STANDARD SENSORS | DIMENSIONS | WEIGHT | OPTICAL PATH | RANGE | CABLE LENGTH | SERVICE REQUIREMENT |
| IR8 Sensor | 95 (3.7”) x 8 (0.3”) x 25 (0.9”) mm | 0.7 kg (1.54 lbs) inc 10m of cable | 8mm | 0 – 30,000 | 10 meters (32.8 ft) standard | No routine servicing |
| IR15 Sensor | 95 (3.7”) x 15 (0.6”) x 25 (0.9”) mm | 0.7 kg (1.54 lbs) inc 10m of cable | 15mm | 0 – 10,000 | 10 meters (32.8 ft) standard | No routine servicing |
| IR40 Sensor | 95 (3.7”) x 40 (1.6”) x 25 (0.9”) mm | 0.7 kg (1.54 lbs) inc 10m of cable | 40mm | 0 – 1,500 | 10 meters (32.8 ft) standard | No routine servicing |
| IR100 Sensor | 95 (3.7”) x 100 (3.9”) x 25 (0.9”) mm | 0.7 kg (1.54 lbs) inc 10m of cable | 100mm | 0 – 200 | 10 meters (32.8 ft) standard | No routine servicing |
| SENSOR | TYPICAL APPLICATIONS | |
| IR100 – Range 0 to 200mg/l The sensor should only be used if the sludge is very ‘light’ with very clear supernatant. | Water Treatment | |
| IR40 – Range 0 to 1,500mg/l This is the most commonly used sensor and is suitable for use on final settlement tanks in sewage treatment applications and clarifiers in water treatment works. | Water Treatment Clarifiers Sewage Treatment Final Settlement Humus Tanks | |
| IR15 – Range 0 to10,000mg/l This sensor is also regularly used for sludge blanket detection and is normally used for primary settlement in sewage treatment and sludge thickeners in water treatment. | Water Treatment Sludge Thickeners Sewage Treatment Primary Tanks | |
| IR8 – Range 0 to 30,000mg/l This sensor should be applied on sludge thickeners in sewage treatment plants. | Sewage Treatment Thickeners | |
| Note: Sensor ranges and detection points are appoximate and depend on the site-specific nature of the treatment process. | ||
WJF Instrumentation Ltd.
#5 3610 – 29th Street N.E.
Calgary, Alberta
Canada
T1Y 5Z7
Calgary Head Office
Toll-Free: (877)291-5572
Standard: (403)291-5570
Ontario & Maritimes Sales:
(905)809-6918
