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Automatic Sludge Blanket Level Detector

Country/Region china
Company sludgecontrols company
Categories Infrared Beam Detector
Telephone 905-873-7791
ICP License Issued by the Chinese Ministry
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Automatic Sludge Blanket Level Detector

The Markland Advantage:

Optimize energy usage

  • Automate your desludge pumping. Rather than pumping at set times, pump when you need to, using this reliable sludge blanket level meter.

Optimize water removal to reduce costly additional processing (belt presses, digesters, centrifuges, etc.)

  • Maximize sludge blanket density automatically. Avoid pumping large volumes of thin sludge; avoid pulling a core hole and pumping water needlessly.

Maintain preferred sludge depth

  • Automate sludge blanket control with this interface level analyzer. Avoid overflows and process problems.

Reduce wear and tear on pumps

  • Pump only when necessary.

Maximize operator’s time and energy

  • Installs quickly and easily no need to calibrate. Simplify operation with a durable level measurement instrument.

Reduce the cost of inaccurate chemical dosing

  • Optimize flocculent precipitate (floc) process adjustment and coagulant dosage control.

Get answers when you have questions

  • Technical assistance is factory-direct from the designers and manufacturers of this sludge blanket level control equipment.
  • Applications
  • Features
  • How it Works
  • Tech Specs
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Used wherever solids are separated from liquids:
  • Municipal water and wastewater treatment plants
  • Primary and secondary clarifiers (gravity settlers)
  • Inclined plate clarifiers / separators (Lamellars )
  • Dissolved air flotation (DAF) tanks (floating bed)
  • Decanting tanks / Decanting control
  • Industrial process + Wastewater clarification
  • Sequential batch reactor (SBR)
  • Batch processes
  • Settlement tanks



  • LED beam automatically adjusts its intensity to detect settled sludge blanket and supernatant interface levels in thick or thin sludges, or in light flocs
  • sludge level interface detection is not distorted by the curved walls of lamellar tanks
  • advanced self-diagnostics
  • ultra high intensity infrared beams
  • automatic beam intensity control
  • 4 20 ma output linear with sludge interface level depth
  • high & low sludge blanket depth set-point relays

How it Works

How it Works

A vertical Probe, submerged in the settlement tank, contains 64 infrared high intensity LEDs stacked vertically, which shine horizontally across a probe gap to 64 phototransistor detectors. This gap contains either liquid or sludge. The 64 pairs are sequentially scanned to locate the sludge bed. Beam power intensity is automatically adjusted to accommodate different sludge and overlying liquid concentrations.

At its highest power level, the beam will shoot through your hand, you could count the bones, but there is not hazard since the beam is only on for a few microseconds. This high intensity beam easily penetrates fouling on the probe’s windows, and as long as the solids in the probe gap are high relative to the solids in the scum layers on the windows, the meter continues to read correctly.

Eventually, the probe has to be removed and given a wipe with a soft cloth.

Process Control
Automatic desludging yields thicker sludge than timers or manual methods, and reduces sludge disposal or processing cost. A desludge pump can be operated automatically from the Low Set-Point Relay along with a Pump Run Interval Timer, and the High Set-Point used as an alarm for excessive sludge depth. Alternatively, the desludge pump can be turned ON at the High Set-Point and OFF at the Low Set-Point, or the 4-20 ma output can be used for continuous variable speed drawoff. The 4-20 ma output can link the sludge blanket level meter to your computer for centralized process control.

Pause Switch Uses
An externally located switch, with a pair of Normally Open contacts, can be connected to act as a Pause Switch”. When these contacts close, the Markland transmitter freezes its last reading, and the LCD displays METER DISABLED HOLDING LAST READING”. This feature is used for a batch mix process to disable the meter during mixing. It is also used to lock out the meter, when the probe is tipped up by a traveling scraper. Both of these uses are illustrated in the accompanying diagrams. When the pause switch reopens its contacts, the sludge blanket level meter waits 30 seconds for the sludge to settle down before resuming normal operation.

Tech Specs

MaterialsProbe: PVC
Mast: PVC Pipe
Clamp: Stainless Steel & Polypropylene
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