Compact Online Particle Counter with Constant Flow Rate

Automatic Particle Counter for online measurement and for long-term condition monitoring

The PAMAS OLS50P online particle counter is a stationary instrument for fluid condition monitoring. All types of light extinction sensors of the PAMAS HCB-LD series can be integrated in the PAMAS OLS50P. If required, the sensor can be built of resistant material, so that it can be used for the analysis of all types of liquids and critical fluids, from water down to strong acid.

The PAMAS OLS50P is equipped with a wear resistant ceramic piston pump. The pump provides a constant flow rate of 10 or 25 ml/min at a pressure range from 0 to 6 bar.

For data transfer, the user has the choice between digital and analogue interfaces. A RS485 data interface is part of the instrument’s standard equipment for digital data transfer. The analogue 4-20 mA channel transmits data to a PLC (Programmable Logic Controller). This interface function makes the PAMAS OLS50P an effective instrument for condition monitoring.


  • Online measurement of hydraulic liquids up to 6 bar
  • Cleanliness control of lubricants
  • Condition Monitoring of operating fluids
  • Monitoring Facility Systems in Aviation Industry
  • Test Rigs for Component Cleanliness

Volumetric measuring cell:

The volumetric cell design of PAMAS sensors guarantees highest accuracy and reproducibility. Every single particle of the sample volume is analysed on its way through the measuring cell.


Particle measurement in eight size channels

Volumetric particle sensor: PAMAS HCB-LD-50/50

Calibration range:
4 to 70 µm(c) as per calibration standard ISO 11171
1 to 200 µm as per calibration standard ISO 21501
Measurement in eight size channels
Maximum particle concentration: 24.000 particles per ml at a coincidence quote of 7.8% and a flow rate of 10 or 25 ml/min