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IN-LINE filters0 pages
IN-LINE
Filters for Mass Flow Meters / Controllers
> General
Inherent to its construction, a thermal mass flow meter or controller for
gases is sensitive to contamination. To increase the MTBF (Mean Time
Between Failure) it is important to make sure that the gas entering the
instrument to clean. The IN-LINE Filter Assembly, screwed into the inlet
of the instrument, provides this service. It contains a 316L sintered metal
filter cartridge that is suitable for general purpose filtration and can be
cleaned with a suitable solvent. If the gas contains a large particulate
content, we advise the use of a pre-filter.
Example:
Flow 80 ln/min air, pressure 5 bara, filter selected: M-422-17 (5 µm).
> Selection
ut hoose a low-flow or medium-flow style filter for instruments
C
with 1/4” female thread at the inlet; the high-flow filter is
suitable for mounting into instruments with 1/2” female thread.
ut principle select finest porosity with low ∆P; preferable ∆P not
In
higher than 250 to 500 mbar, and porosity not bigger than 5 µm.
At P1 = 1 bara, ∆P across filter = 389 mbar (see graph).
At P1 = 5 bara, ∆P = 389 = 78 mbar.
5
Models M-410 and M-411: 100 bar.
Models M-422 and M-423: 200 bar.
For other gases than air the pressure drop is difficult to calculate,
because the total pressure drop is built up from both laminar and
turbulent pressure losses; therefore contact factory regarding exact
pressure losses, if so required.
> Pressure drop
> Material of construction
The approximate pressure drop across a filter assembly can be
c
alculated as follows:
Housing: AISI 316
O-rings: Viton; optional EPDM and FFKM (Kalrez).
> Pressure rating
Stylet
Model no.tt
Average porosityt
Type / areat
Connections in / out
Ultra-low-flowt
M-410-13tt
0,5 µmt
316L / 2,5 cm2t
1/8” female / 1/8” male
M-410-16tt
2 µmt
316L / 2,5 cm2t
1/8” female / 1/8” male
M-410-18tt
7 µmt
316L / 2,5 cm2t
1/8” female / 1/8” male
M-410-20tt
15 µmt
316L / 2,5 cm2t
1/8” female / 1/8” male
Low-flowt
M-411-13tt
0,5 µmt
316L / 2,5 cm2t
1/4” female / 1/4” male
M-411-16tt
2 µmt
316L / 2,5 cm2t
1/4” female / 1/4” male
M-411-18tt
7 µmt
316L / 2,5 cm2t
1/4” female / 1/4” male
M-411-20tt
15 µmt
316L / 2,5 cm2t
1/4” female / 1/4” male
Medium-flowt
M-422-16tt
2 µmt
316L / 5 cm2t
1/4” female / 1/4” male
M-422-17tt
5 µmt
316L / 5 cm2t
1/4” female / 1/4” male
M-422-19tt
10 µmt
316L / 5 cm2t
1/4” female / 1/4” male
M-422-21tt
20 µmt
316L / 5 cm2t
1/4” female / 1/4” male
High-flowt
M-423-16tt
2 µmt
316L / 5 cm2t
1/2” female / 1/2” male
M-423-17tt
5 µmt
316L / 5 cm2t
1/2” female / 1/2” male
M-423-19tt
10 µmt
316L / 5 cm2t
1/2” female / 1/2” male
M-423-21tt
20 µmt
316L / 5 cm2t
1/2” female / 1/2” male
M-423-22tt
40 µmt
316L / 5 cm2t
1/2” female / 1/2” male
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