ASLD 2200

Automatic Sludge Blanket Level Monitoring

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.

For information our Sludge Blanket sensors go to the sludge blanket sensor page.

Applications

  • Final Settlement Tanks
  • Clarifiers
  • Primary Settlment Tanks

Features

  • Simple Operation
  • Low Cost of Ownership
  • Continuous Output

Technical Specification

Physical

Dimensions490 x 350 x 382 mm (HxWxD)
Weight15 kg
Protection ClassIP55 Outer Enclosure with IP65 Electronics Housing
Enclosure MaterialGRP Outer with Polycarbonate Inner
Cable Entries3 x PG11 (cable 5 to 10 mm)
Cable SizeMax Conductor Size 2.5 mm²

Electrical

Power Supply115/230VAC, +10/-15% Field Selectable
Power Consumption25VA
Fuse1A

Environmental Data

Operating Temperature Electronics 0 to 50ºC
Storage Temperature Electronics 0 to 50ºC
Location Indoor or Outdoor

User Interface

Display3 Digit , 7 Segment LED Display of 0-100%
SetupPotentiometer and Push Buttons on main PCBA
Units of Measurement%age Depth

Output Signals

Analogue Output4-20 mA, maximum load 500 ohm
Relay1, this alarms at 0 and 100% and is not adjustable
ContactsContact Closure, 0.5 A @100VDC
Local Annunciation6 LED's on main PCBA

Measurement Characteristics

Response Time5 second delay, tracks blanket at 1 metre per minute
AccuracyTypically +/- 5% FSD
Resolution+/- 100mm
Measurement PrincipleLight Attenuation
Depth Range0 to 1.5 to 0-20 metres
Information to Download
Measurement Links