LiQuilaz® II S05 Liquid Particle Counter

Broad-range volumetric monitoring from 0.5 to 20 µm

The LiQuilaz® II S05 from Particle Measuring Systems is a volumetric optical particle counter designed for process chemicals and high-purity liquids. Its 0.5 to 20.0 µm measurement range is broader than the ranges of the S02 and S03 models, making the S05 particularly useful when an application must detect both small particles and larger contamination events. Typical uses include component cleanliness testing, process-bath monitoring, chemical quality assurance, deionized-water monitoring, chemical delivery systems, and the detection of particles generated by wear or abrasion.

The S05 analyzes 100% of the liquid passing through its illuminated capillary. Full-volume measurement supports statistically useful results during shorter sampling intervals, especially when contamination levels are low. The instrument provides from one to fifteen user-adjustable size channels so that a monitoring plan can focus on process-specific thresholds. “100% sample volume” describes the volume passing through the sensing zone; it does not mean that every result is automatically free from sampling error. Bubbles, unstable flow, dirty tubing, residues, excessive concentration, and incorrect material selection can still affect particle data.

Online monitoring and batch sampling

For online or in-line monitoring, the LiQuilaz II S05 operates at a nominal 80 mL/min with a ±10% tolerance. This configuration can provide rapid visibility into filter behavior, process-bath changes, chemical delivery events, and particle excursions after maintenance. A 20 mL/min configuration with a ±10% tolerance is also available for sampler applications. When combined with a precision syringe sampler, the system can draw and dispense a controlled sample volume for bottle testing, laboratory investigations, valuable chemicals, or parts-cleanliness extracts.

Technical specifications and chemical compatibility

The supplied PMS S-Series specification sheet lists a recommended maximum concentration of 10,000 particles/mL, a zero count below 15 particles/L, a sample pressure range of 0 to 100 psi, and a sample temperature range of 0 to 150 °C. Wetted materials include sapphire, Teflon®, Kalrez® 4079, and Kel-F®. Communications include RS-485, 10/100Base-T Ethernet, PMS Ethernet Protocol, and Modbus TCP. Calibration materials are traceable to the U.S. National Institute of Standards and Technology and/or Japanese Industrial Standards.

These published limits require application review. A maximum temperature of 150 °C should not be interpreted as universal compatibility with every chemical at every pressure. Chemical identity, concentration, viscosity, gas release, temperature, pressure, tubing, fittings, and all wetted surfaces must be evaluated together. PMS identifies the S-Series for process chemicals including hydrofluoric acid and hot corrosive liquids when the correct configuration is selected.

Why the 0.5–20 µm range matters

The S05 is often a practical choice for component cleanliness testing because particles are first extracted from a complex part into a liquid and then counted in that extraction fluid. Its range can capture smaller contamination while extending to larger particles that may represent wear debris, fibers, residues, or process-generated material. The same range can support monitoring before and after filtration, comparison of cleaning steps, and investigations following equipment maintenance. However, the S05 should not replace an S02 or S03 when critical thresholds are below 0.5 µm.

Particle Measuring Systems has also evaluated the thermal behavior of the LiQuilaz S05. Ambient-temperature changes and heat produced by internal components can affect optical sizing systems, so appropriate stabilization and consistent test conditions are important when comparing trends or performing investigations.

Software and support in Vietnam

Depending on the system design, FacilityNet™, FacilityPro®, or SamplerSight™ may support current and historical data views, alarms, sampler setup, and reporting. Exact functions depend on the licensed software and supplied configuration.

SAO NAM supports Particle Measuring Systems customers in Vietnam with application assessment, model and accessory selection, official equipment supply, installation guidance, operator training, calibration, preventive maintenance, and technical troubleshooting, depending on the supplied configuration, project scope, and service agreement. For configuration review, provide the liquid name, chemical concentration, target particle sizes, sample volume, temperature, pressure, viscosity, sampling method, and data-integration requirements.