What Is a Micron Rating? | Choosing Between Nominal & ...

Understanding Micron Ratings and Filtration Choices

Filtering particles from liquids becomes more efficient with a smaller micron rating, which removes a higher number of particles. However, fine filters with low micron ratings can quickly clog in systems with heavy sediment loads, leading to increased differential pressure and reduced flow rates, necessitating frequent filter changes.

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In systems with significant sediment, multiple filtration stages—from coarser filters with higher micron ratings to finer filters downstream—optimize efficiency, extend filter life, and reduce operating costs.

We provide a variety of filter cartridges, including specialized membrane versions with micron ratings as low as 0.05 microns, small enough to filter out viruses.

Nominal vs. Absolute Filters

The micron rating of a filter indicates its effectiveness in parting solids and liquids. However, this is influenced by the materials and construction of the filter, which can shift under different operating conditions. Filters are categorized into:

• Absolute - Ensures 99.9% of particles at or above the micron rating are filtered out.
• Nominal - Indicates the percentage of particles at or larger than the micron rating that will be captured.

Absolute filters provide high efficiency (99.9%) in filtering particles larger than their micron rating, using premium materials and stringent methods. They are ideal for processes requiring superior filtrate quality and are more costly than nominal filters.

We offer absolute filters for various filtration needs, with ratings from 0.05 to 100 microns. Many of our absolute filters, like the Deltapor MB melt-blown range, meet FDA and European Regulation standards for food contact, providing high throughput, low pressure loss, high dirt capacity, and longevity.

Nominal filters, a cost-effective choice, perform well in numerous applications when both micron and efficiency ratings are considered. For example, a nominal filter with a 95% of 10-micron rating will retain 95% of particles 10 microns or larger.

Our filter cartridge range encompasses both nominal and absolute versions, ensuring effective filtration with minimal operating cost.

Testing for Real-World Effectiveness

Our cartridges undergo strict testing to establish beta ratios, highlighting their filtration efficiency. Filters are tested with control liquids containing specific particles, measuring particle counts upstream and downstream to calculate the beta ratio. A higher beta ratio signifies greater filtration efficiency.

While lab tests provide robust data, real-world performance is paramount. Our products excel across diverse filtration processes and conditions. For niche industries desiring real-world data before investing, we offer pilot testing by our expert engineers, providing comprehensive reports to help select the optimal filter cartridge at minimal operating cost.

Industrial Filtration System Selection: Critical Factors

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When selecting an industrial filtration system, several factors need consideration, including contaminant particle size, system operating conditions, chemical compatibility, and the physical configuration of the housing unit. These systems are crucial and require thoughtful selection.

Choosing the Right Industrial Filtration System

Deciding on a filtration system involves evaluating multiple factors, as this choice impacts the overall operational efficiency. Below are four key factors to consider:

Particle Size

Identify what particles you need to filter out (size and type). Filters are measured in microns, a unit where one micron equals one-millionth of a meter. Understanding the particles' size helps in choosing the appropriate filter. Note that smaller micron filters clog faster, which may harm the system. Ensure the micron rating matches your system's needs.

Operating Conditions

Temperature and pressure impact filter choice. High-temperature systems (above 140°F) require metal filters. Ensure the chosen filter can handle your system's flow rate to prevent pressure-related failures.

Chemical Compatibility

Chemical compatibility means stability when substances mix. Ensure the filter material is compatible with the liquid being filtered to prevent degradation and ensure effective filtration.

Physical Configuration of Housing

Selecting the right housing configuration depends on your system’s spatial constraints and filtration type (e.g., cartridge, bag). Decide between self-cleaning and manual systems, considering cost and practicality (material, end connection type).

Careful Consideration is Key

When selecting a filtration system, deliberate on all factors. It’s a vital component in your system’s operation. Consider particle type, chemical compatibility, and explore options to find the best fit. If uncertain, our Customer Service is ready to assist!

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