Particle Monitors

The LPM-II-plus from STAUFF is an optical inline particle monitor that records the degree of contamination of hydraulic and lubricating fluids in a stationary position and in real time. With its 8-channel analysis in accordance with international standards, it provides reliable information on oil cleanliness - a decisive factor, as 70 to 80 % of all hydraulic failures are due to contaminated media. The precise measurement supports preventive maintenance, reduces downtimes and protects sensitive components.

For demanding industrial environments, an ATEX version (Zone 2 / Category 3G) is also available, which enables use in potentially explosive atmospheres, for example in mining, the oil and gas industry or chemical process engineering.

The particle monitor works fully automatically according to the light blockade principle. The flowing fluid passes through an optical measuring chamber in which particles are detected using high-power LEDs. The intensity of the light shading allows conclusions to be drawn about the size and number of particles.

The particle monitor then evaluates the measurement result according to globally recognised purity standards. Clear colour coding makes the condition of the oil immediately recognisable - without any detours via external evaluation tools.

The LPM-II-plus combines a robust design with comprehensive measurement and communication capabilities.

Measuring parameters

• 8 channels: 4, 6, 14, 21, 25, 38, 50, 70 µm(c)

• International standards:
  ISO 4406, NAS 1638, AS 4059E/F, ISO 11218

• Programmable measuring time: 10-3600 s

• Accuracy: ±½ class (depending on size)

Mechanics and operation

• Maximum pressure: 420 bar (static)

• Viscosity: up to 1000 mm²/s

• Protection classes: IP65 / IP67

• Robust design, suitable for continuous operation

• Connections: STAUFF Test 20 (M16×2)

Communication and data exchange

• RS485 and RS232

• Modbus

• CAN bus

• 4-20 mA time-division multiplex (standard)

• USB data interface (optional)

• Internal memory: 4000 measurements

Optional sensors

• Water-in-oil sensor (% RH)

• Temperature measurement (°C)

The particle monitor offers significant added value for maintenance, system operation and quality assurance:

• Continuous condition monitoring without manual sampling

• Reproducible, precise measurement results thanks to 8-channel optical analysis

• Early warning system with colour-coded cleanliness indicators

• Seamless integration into control and management systems

• Reduced operating costs through preventive oil maintenance

• Expandable to include humidity and temperature measurement

• Robust and reliable - even in continuous operation

• Available as ATEX version for Zone 2