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| Mr. Serie Jr. volunteers for Envicontrol at Pollutec 2013 and shows his enthusiasm for the MOI BAM 1020. |
Met One Instruments, Inc. has
extensively evaluated several types of Teflon (PTFE) filter tape for use with
the BAM product line. As of now, we have never identified any Teflon filter
that is superior to the regular glass fiber filter for the BAM application:
11)
The
BAMs have a small spot size and a high flow rate. The resulting high pressure
drop and high face velocity is very difficult on the filter material.
22)
Glass
fiber material is a depth filter which has extremely high filtration efficiency
of greater than 99.999% down to .2 micron particles and even much smaller.
Teflon membrane is a porous surface filter which is not as efficient and some
particles get through.
33)
Glass
fiber material can handle much higher filter spot dust loads before the airflow
is restricted. Teflon sometimes blocks the airflow in concentrations lower than
100 ug.
4 4)
Pure
Teflon membrane is too weak and too stretchy to be handled by the machine, so
it must be laminated with a support backing of another material. This makes it
cost more than three times as much as glass fiber.
55) Teflon filter tape also does not seal with the nozzle and vane parts
as well as the glass fiber material does, so the leak rate is significantly
higher. (by Mr. Dennis Hart, Product Engineer)
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