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ASLD 2200 - Automatic Sludge Blanket Level Monitoring
From SludgeWatch - Sludge Blanket Detection
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The ASLD 2200 is a fully automatic sludge blanket level detector primarily designed for the water and waste water industry but could be applied to other types of process. It utilises a servo-driven sensor which continually tracks the settled interface and produces a 4-20 mA output which is proportional to the depth of the blanket. The ASLD 2200 is supplied with either a Infrared or Soli-Tech 20v2 sensor. The use of infrared attenuation as the principle of operation for the sensor 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 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.
Applications
- Final Settlement Tanks
- Clarifiers
- Primary Settlment Tanks
Features
- Simple Operation
- Low Cost of Ownership
- Continuous Output
Technical Specification
Physical
Dimensions 490 x 350 x 382 mm (HxWxD)
Weight 15 kg
Protection Class IP55 Outer Enclosure with IP65 Electronics Housing
Enclosure Material GRP Outer with Polycarbonate Inner
Cable Entries 3 x PG11 (cable 5 to 10 mm)
Cable Size Max Conductor Size 2.5 mm²
Electrical
Power Supply 115/230VAC, +10/-15% Field Selectable
Power Consumption 25VA
Fuse 1A
Environmental Data
Operating Temperature Electronics 0 to 50ºC
Storage Temperature Electronics 0 to 50ºC
Location Indoor or Outdoor
User Interface
Display 3 Digit , 7 Segment LED Display of 0-100%
Setup Potentiometer and Push Buttons on main PCBA
Units of Measurement %age Depth
Output Signals
Analogue Output 4-20 mA, maximum load 500 ohm
Relay 1, this alarms at 0 and 100% and is not adjustable
Contacts Contact Closure, 0.5 A @100VDC
Local Annunciation 6 LED's on main PCBA
Measurement Characteristics
Response Time 5 second delay, tracks blanket at 1 metre per minute
Accuracy Typically +/- 5% FSD
Resolution +/- 100mm
Measurement Principle Light Attenuation
Depth Range 0 to 1.5 to 0-20 metres
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