Liquid Block Option
Classic Filters offers a Liquid Block option which stops the flow of the gas sample through the PTFE if the differential pressure becomes too high.
If the PTFE membrane becomes flooded the increase in pressure drop can cause liquid to be forced through the membrane The valve in the housing plug will automatically close when a high differential pressure occurs and shut off the flow.
Twin Support Disc Option
On standard membrane housings the PTFE membrane is supported by a sintered, porous stainless steel disc on the outlet side. If the flow is reversed during normal operation there is a chance that the PTFE membrane can be damaged.
Our Twin Disc option adds another sintered support disc to the front face of the PTFE membrane. This second support disc on the front face on the membrane keeps the membrane in place to help prevent any damage.
Exotic Materials for Membrane Housings
All our standard and special custom PTFE-membrane housings can be supplied in exotic materials including Hastelloy or Monel. More information about exotic materials can be found here.