Coalescing Membrane Filters

  • Continuous separation of all liquids from gases by hydrophobic or oleophobic membrane
  • Optimal analyzer protection = lower maintenance and down time
  • Suitable for ppb to % analyzer protection
  • Low pressure drop across membrane

The coalescing membrane filter was designed to protect analyzers and other components effectively from sample stream contaminants (liquids, particulates) in different applications.

The coalescing membrane filter is usually installed before the analyzer or the component to be protected. Pre-filtration results in smaller dead volume and, in addition, reduces risk of leakage.

The filter is made up of a stainless steel housing with the membrane fixed by a sintered metal disk before the sample gas outlet. Gas enters through the inlet port and is directed down through the coalescing filter. The coalescer traps all particulates and continuously drains liquid contaminants which protects the membrane. The sample gas then flows upward to the upstream side of the membrane and exits from the bypass outlet port on the downstream side. Due to the tangential stream of the membrane, any droplets arising are dragged along to the bypass exit continuously - self cleaning the system.

The membrane is extremely inert and is recommended for most process liquid applications, with the exception of hydrofluoric acid. It is recommended for use in systems designed for ppb, ppm and percent level component concentrations, as a result of its very low absorption characteristics.

The membrane is strong and durable, but also very soft and pliable. The filter head makes a simple and fast membrane change possible without use of tools. A wall mounting bracket made of high-grade steel with quick release device is available as accessory. The coalescing membrane filter can be twisted directly at a relaxed fast instep device.

Microscopic pores contained within the membrane permit molecules of gas to flow through easily, allowing the composition of the sample gas unchanged. Conversely, even the smallest droplets of liquid remain trapped and are unable to flow through the membrane's small passages under normal operating conditions.

There are two different types of membranes available - a hydrophobic membrane to separate water droplets and an oleophobic membrane to separate all oil and hydrocarbon droplets.

cmc Instruments manufacture a full range of gas generators for nitrogen (both membrane and PSA technology), hydrogen, zero air, purge gas and TOC gas. Applications are found in LC-MS laboratories, GC laboratories, FT-IR spectroscopy, total hydrocarbon analysis (THA), industrial purging and many more.

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