Posted on: Thursday, March 13th, 2014
Recommended Membrane Maintenance – Membrane Filter & Membrane Sample Probe Products
A+ Corporation recommends inspection and replacement of membranes at least once per quarter. Actual membrane maintenance replacement requirements may vary and will be specific to your sample conditioning system. Factors such as sample gas flow rate, gas composition, and the presence and amount of liquids and/or particulates will all affect membrane life span. Monitoring the membrane filter and membrane probe outlet flow rate will help indicate when the membrane should be replaced. When the gas flow rate from the Genie® Separator or Sample Probe outlet port drops off and more supply pressure is needed to restore the original flow rate, the membrane may need to be replaced.
The difference in surface tension between liquids and gases is the property that allows our phase separation membrane to segregate the two phases. Liquids can be forced through any phase separation membrane if the membrane differential pressure is large enough. One factor that affects membrane differential pressure is reduced membrane surface area, which happens when the membrane is not replaced regularly. This is why the membrane maintenance schedule is crucial. Liquid and particulate accumulation on the membrane can create a noticeable pressure drop across the membrane. When the pressure drop becomes large enough, liquids will be physically forced through the membrane’s microscopic pores.
If the membrane requires frequent replacement, preconditioning the sample prior to entry into the Genie® Membrane Separator™ or Genie® Membrane Probe™may be required under certain conditions such as particulate, gummy or sticky contamination. A depth type of filter, such as an Avenger™ Series particulate and coalescing filter, is recommended for this purpose. Depth filters have a large loading capacity but do not have the removal efficiency or the inherent spillover protection of the Genie® Membrane Separator™. Use of an A+ Avenger™ Series 30 membrane and coalescing filter combination provides the ultimate level of contaminant removal protection.