IN-LINE Filters

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 is 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.

Selection

• Choose a low-flow or medium-flow style filter for instruments with ¼” female thread at the inlet; the high-flow filter is suitable for mounting into instruments with ½” female thread; the ultra-low-flow filters have 1/8" connections.
• In principle select finest porosity with low ΔP; preferably ΔP not higher than 250 to 500 mbar, and porosity not bigger than 5 μm.

Available models

Style	Model no.	Average porosity (mm)	Connections in/out	Pressure rating
ultra-low-flow	M-410-13	0.5	1/8"female/1/8"male	100 bar
	M-410-16	2	1/8"female/1/8"male	100 bar
	M-410-18	7	1/8"female/1/8"male	100 bar
	M-410-20	15	1/8"female/1/8"male	100 bar
low-flow	M-411-13	0.5	1/4"female/1/4"male	100 bar
	M-411-16	2	1/4"female/1/4"male	100 bar
	M-411-18	7	1/4"female/1/4"male	100 bar
	M-411-20	15	1/4"female/1/4"male	100 bar
medium-flow	M-422-16	2	1/4"female/1/4"male	200 bar
	M-422-17	5	1/4"female/1/4"male	200 bar
	M-422-19	10	1/4"female/1/4"male	200 bar
	M-422-21	20	1/4"female/1/4"male	200 bar
high-flow	M-423-16	2	1/2"female/1/2"male	200 bar
	M-423-17	5	1/2"female/1/2"male	200 bar
	M-423-19	10	1/2"female/1/2"male	200 bar
	M-423-21	20	1/2"female/1/2"male	200 bar
	M-423-33	40	1/2"female/1/2"male	200 bar

Leaflet

For more information see leaflet "IN-LINE filters"