Particle Counter Sensor

Particle Counter Sensor

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Particle Counter Sensor
  • Particle Counter Sensor
Particle Counter Sensor
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Particle Counter Sensor

The QualiOPC™ 60 is a high-performance optical particle counter sensor designed for precise fluid contamination analysis. Engineered as a core sensing module for portable, inline, and laboratory monitoring systems, it delivers professional-grade particle sizing across a wide measurement range without compromising on optical sensitivity or structural integration flexibility.
  • Wide 1 To 500 Micrometer Range
  • Compact Cylindrical 52 MM Frame
  • Stable 60 ML/Min Flow Rate
  • Ultra Fine 0.1 µm Sizing Resolution

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Particle Counter Sensor – QualiOPC™ 60

The performance of a particle counter sensor directly influences the precision of oil cleanliness and fluid contamination analysis systems. QualiOPC™ 60 is a compact optical sensing module designed for accurate particle sizing and counting in inline, portable, and laboratory-based monitoring solutions.

QualiOPC™ 60 functions as a high-precision analytical sensor that detects solid particles suspended in liquids using the optical light-blocking principle. As particles pass through the sensing zone, variations in the light signal are converted into reliable particle size and count data, enabling consistent contamination measurement across industrial applications.

This sensor is engineered for integration within advanced oil and liquid particle monitoring systems used in predictive maintenance programs, fluid condition assessment, and quality assurance workflows. Its compact and durable construction makes it suitable for both mobile equipment and fixed installations, while supporting internationally recognized cleanliness and calibration standards such as ISO 4402 and ISO 11171.

Built for demanding industrial environments, QualiOPC™ 60 serves as the core sensing component in portable particle counters, inline monitoring systems, and laboratory-grade contamination analyzers where accurate and repeatable particle detection is essential.

The device utilizes semiconductor laser technology combined with the light-blocking method to identify and measure suspended particles across a wide size range. Its cylindrical, space-efficient design supports seamless integration into modern contamination monitoring setups, ensuring stable performance and high measurement reliability.

Particle Counter Sensor – QualiOPC™ 60 Applications

Hydraulic Oil Monitoring:
QualiOPC™ 60 is well-suited for hydraulic systems where continuous monitoring of wear particles and contamination levels is essential for predictive maintenance strategies. It supports early detection of fluid degradation and helps maintain stable system performance.

Lubricating Oil Analysis:
The sensor integrates into systems designed to measure particulate contamination in industrial and mechanical lubricants. It enables accurate assessment of oil cleanliness and provides insight into overall lubricant condition and service life.

Transformer Insulating Oil Testing:
This application supports power generation and transmission equipment by monitoring dielectric fluid cleanliness. It helps ensure insulation reliability and reduces the risk of performance issues caused by contamination.

Gear, Engine, and Aviation Fuel Inspection:
These use cases focus on detecting and analyzing particle contamination in gear assemblies, engine systems, and aviation fuels. It supports verification of fluid purity, helping protect critical components from wear and efficiency loss.

Inline Industrial Fluid Monitoring:
Designed for compatibility with portable and online particle counter systems, QualiOPC™ 60 is also suitable for real-time industrial fluid condition monitoring. It enables continuous contamination tracking when integrated into advanced instrumentation platforms used for process control and system diagnostics.

Standards

ISO 4402 – A reference standard for fluid particle counting calibration, historically used in defining calibration procedures for optical particle measurement systems.

ISO 11171 – An internationally recognized standard for calibration and verification of automatic particle counters, ensuring accuracy and consistency in particle size and count measurements.

ISO 4406 – A widely used cleanliness coding standard that defines contamination levels in hydraulic and lubrication systems based on particle concentration.

NAS 1638 – A classification system used in aerospace and industrial applications to evaluate and grade fluid contamination levels.

SAE AS4059 – An aerospace and industrial standard that defines fluid cleanliness classes based on particle size distribution and concentration.

GOST 17216 (ROCT 17216) – A particle contamination classification standard used for assessing cleanliness levels in technical fluids across industrial systems.

Particle Counter Sensor – QualiOPC™ 60 Key Features

  • Optical light-blocking technology for precise liquid particle sizing and counting.

  • High-sensitivity optical design that delivers stable measurement performance and strong resolution for contamination detection.

  • Fine particle size channel resolution with a representative interval down to 0.1 µm, depending on system configuration.

  • Wide application compatibility for portable, inline, and laboratory particle counting systems.

  • Compact and durable construction designed for long-term operation in field instruments and fixed industrial installations.

  • Calibration support aligned with internationally recognized standards such as ISO 4402 and ISO 11171.

  • Semiconductor laser light source for consistent and reliable optical performance.

  • Broad particle measurement range from 1 µm to 500 µm.

  • High repeatability with RSD below 2%, ensuring consistent measurement accuracy.

  • Adjustable flow rate range from 5 to 60 mL/min, with a standard operating rate of 25 mL/min for measurement.

Theory and Method

QualiOPC™ 60 operates on the optical light-blocking principle for liquid particle detection and analysis. When suspended particles pass through the sensing zone, they partially obstruct the laser beam, creating measurable signal variations. These signal changes are processed to determine particle size distribution and particle count data.

This measurement approach is widely used in fluid contamination monitoring due to its ability to directly evaluate solid particles suspended in oils and industrial liquids. It enables reliable assessment of fluid cleanliness in real time and supports consistent monitoring across different system types.

Designed as a high-sensitivity optical sensing component, QualiOPC™ 60 delivers stable operation, fine resolution, and repeatable measurement performance when integrated into portable, inline, or laboratory particle counting systems.

Particle Counter Sensor - QualiOPC™ 60 Technical Specification

Parameter QualiOPC™ 60
Model QualiOPC™ 60
Product Type Particle Counter Sensor
Light Source Semiconductor laser
Detection Principle Optical light-blocking method
Particle Size Range 1 μm to 500 μm
Sensitivity 1 μm (ISO 4402) or 4 μm(c) / 4 μm based on ISO 11171
Detection Speed 5 to 60 mL/min, default 25 mL/min
Cleaning Speed 5 to 60 mL/min
Coincidence Error Limit 12,000 to 40,000 particles/mL
Repeatability RSD < 2%
Sample Temperature 0°C to 80°C
Length 214 mm
Maximum Height 115 mm
Head Diameter 52 mm
Tail Diameter 46 mm
Mounting Movable fixture, M4 screw mounting
Compatibility Portable and online particle counter systems
Calibration Support ISO 4402, ISO 11171

Delivery time varies upon stock availability. Our standard dispatch and shipping times are generally within 1 week, however for some high demand items the delivery may be extended to 2-3 weeks. If you require these items urgently please contact us to check accurate stock availability and to organize faster shipping methods.

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Important Delivery Information

Delivery time varies upon stock availability. Our standard dispatch and shipping times are generally within 1 week, however for some high demand items the delivery may be extended to 2-3 weeks.

Need it urgently? Contact us here to check stock and organize faster shipping.

Orders:
Purchaser acknowledges that when placing an order on the Qualitest:

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C. the purchaser has the full authority to enter into the contract for such entity, and such grant of authority was indicated by purchaser by placement of the order through the Qualitest.
D. A minimum handling fee will be applied to the shipping total for all orders.

Shipping within the U.S.A.:

All orders will be shipped best way prepaid, via courier for smaller packages or via Freight forwarders for larger crates. A handling fee may be applicable to orders. Title to merchandise transfers to the purchaser upon delivery to the carrier. Loss or damage in transit is the responsibility of the purchaser. Qualitest USA will provide assistance with information needed for processing claims.

Shipping outside of the U.S.A.:

All orders will be shipped best way, via courier for smaller packages or via Freight forwarders for larger crates. A low handling fee may be applicable. Title to merchandise transfers to the purchaser upon delivery to the carrier. Loss or damage in transit is the responsibility of the purchaser. Qualitest USA will provide assistance with information needed for processing claims. Export fees, duties, taxes, and customs clearance are the responsibility of the purchaser.

Shipping insurance is not included, please contact our sales representatives if you need shipping insurance.

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Payment terms: All payments to Qualitest USA are to be made in U.S. Dollars (USD)

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their bank information
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Qualitest USA may accept return of purchased merchandise within North America for refund or credit under the following conditions -

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Force Majeure:

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I. What legal provisions govern our data processing practices? How and from where (internal/external sources) is personal data acquired? What are the rights of the user (web site visitor/registered customer)? 

1. General
As a general principle, no personal details need to be provided when visiting our Internet site. Data made available to us by you is treated in strict confidence and in accordance with the provisions of the Federal Data Protection Act. With a few exceptions (see point 2 below), our web server only registers non-personal (anonymous) data concerning the use of our site. Specifically, the log files of our web server, as a general rule, only contain the user's IP address, the last page visited by the user, the browser used, date, time and the file requested. This anonymous data, however, does not permit conclusions to be drawn about the individual users, and merely serves to prepare statistics on the use of our Internet site for the purpose of its improvement. At the same time, great importance is placed on ensuring that usage data is not linked with personal data. 

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