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LiQuilaz® II E15P Liquid Particle Counter

The LiQuilaz® II E15P from Particle Measuring Systems is a volumetric liquid particle counter designed for measurements from 1.5 to 125 µm. It supports up to 15 user-configurable size channels and operates at a nominal flow rate of 20 mL/min. The optical system measures 100% of the liquid volume that passes through the sensing zone, making the instrument suitable for low-volume samples and applications where missing relatively rare particles could affect the interpretation of cleanliness.

The measurement principle is light obscuration. A particle passing through the illuminated sensing region reduces the light reaching the detector. The resulting signal is processed and assigned to the appropriate size channel. The instrument therefore produces both particle counts and a particle-size distribution. However, an optical counter cannot automatically distinguish a solid particle from a bubble. Sample preparation, degassing, container cleanliness, tubing condition, background verification, and stable flow are essential parts of a reliable method.

LiQuilaz II E15P is the particle-measurement component rather than a complete laboratory sampler by itself. In a syringe-sampling configuration, a precision syringe draws and dispenses a defined volume through the counter. The current PMS SLS-1000 specification lists E15P under the SLS-2000 system label. This architecture combines the particle counter, a precision syringe sampler, wetted flow-path components, and SamplerSight software for controlled batch measurements. It is especially useful when samples are costly, hazardous, or only available in limited quantities.

Published technical information for the SLS configuration lists a maximum concentration of 10,000 particles/mL, background counts below 50 particles/L, and a sample-temperature range of 10–50 °C. Wetted materials for the E-series optical path include fused silica, black quartz, Teflon®, Kel-F®, and Kalrez®. Calibration is performed with standards traceable to NIST and/or JIS according to PMS documentation. These values are useful for preliminary selection, but every project requires a separate review of chemical compatibility, viscosity, sample temperature, pressure, tubing, valves, and cleaning chemicals.

Typical applications include pharmaceutical water monitoring, process-liquid investigations, filtration studies, parts-cleanliness extracts, medical-device cleanliness, incoming-liquid quality control, and comparison of particle levels before and after a manufacturing step. The broad 1.5–125 µm range is useful when an application must observe both smaller particles and larger visible or near-visible contamination in the same method. The 15 channels can be configured around internal alert levels, historical limits, filter ratings, or product-specific acceptance criteria.

SamplerSight software can support method configuration, data acquisition, tabular results, time plots, histograms, and reports in compatible systems. Electronic-record compliance must be evaluated at the complete system level. A particle counter alone does not establish compliance with 21 CFR Part 11. User access, audit trails, software configuration, validation, procedures, backup, review, and data governance must operate together to support regulated use.

Users should distinguish LiQuilaz II E15P from older E15 instruments referenced in previous lifecycle notices. The exact model, part number, and serial number should be checked before calibration, repair, accessory selection, or replacement planning. PMS continues to list E15P in its 2026 SLS-1000 configuration table, but ordering codes, regional availability, software licenses, and service scope should be confirmed for each project.

SAO NAM supports Particle Measuring Systems customers in Vietnam with application review, configuration selection, official equipment supply, installation guidance, operator training, calibration, preventive maintenance, troubleshooting, and lifecycle planning. For an accurate proposal, provide the liquid name and composition, target particle sizes, sample volume, viscosity, temperature, corrosiveness, expected concentration, cleaning method, reporting requirements, and the serial number of any existing instrument.