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.


Contamination control and fluid condition monitoring.

Sample input

Pressure range: 0 to 6 bar
Constant flow rate: 10 or 25 ml/min

Interfaces for data transfer

Standard equipment:

  • RS485

  • Analogue 4-20 mA interface. Parallel data transmission for four size channels or serial data transmission for all eight size channels

Volumetric particle sensor: PAMAS HCB-LD-50/5o

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

Standards and methods
ISO 11171 ISO 4402 ISO 21501-3 ISO 21501-2 ISO 4406 SAE AS4059
NAS 1638

* in connection with PAMAS PMA software.


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