Ultra DI® 20 Liquid Particle Counter

Designed specifically for ultrapure water systems, the Ultra DI® 20 Liquid Particle Counter quickly obtains statistically meaningful data and will count and size contaminants as small as 20nm. Consistency helps you get more out of your data, even if the instrument moves, so you have more control over your process. The Ultra DI 20 Particle Counter has a low zero count, large sample volume and high counting efficiency that provides unsurpassed particle detection. Improved sensitivity allows you to detect process variations more quickly with 20nm polystyrene latex (PSL) and 9nm gold (Au).


Save operator time with fast cleanup and the ability to move quickly from one sample point to another
Speed up analysis time by using shorter sample intervals
Respond immediately to contamination with real-time particle measurement
FacilityNet Software provides more sophisticated process control
Set tighter process control limits with low sample-to-sample variation

Features & applications


Local data display
Larger sample volumes and ultra-low zero counts detect smaller excursions with more relevant statistical data
Utilizes existing network with ethernet communication
Connects directly to PLC and SCADA systems with 4-20mA
Compatible with ozonated water
Stainless steel housing and dual HEPA filtration for use in clean environments


Quantifying particle concentration in state- of-the-art ultra pure water (UPW) systems
Filter efficiency measurements
Trending analysis at lower particle concentrations
Detecting bacterial growth in UPW systems
Episodic event tracking and alarming
Continuous system monitoring
Manufacturing process control

Available accessories

All available accessories


Liquid Installation Kit

For use with online applications, the Liquid Installation Kit includes: a Flaretek® flaring tool, five caps, 25ft of 1/4in Perfluoroalkoxy alkanes (PFA) tubing and male connectors.


Facility Net Software

Facility Net Software provides a solution for comprehensive environmental monitoring, including a real-time and historical data display. Compatible Particle Measuring Systems particle counters and molecular contamination monitors, as well as various third-party products.


Downstream Flow Controller

The Downstream Flow Controller for de-ionized water utilizes a rotameter flow indicator.

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