Filter

OVERVIEW FILTERS

Description

Filter carriers protect the humidity and temperature sensors against mechanical damage. Filters act as a protective barrier against contaminants/ pollutants that can influence the sensor. When choosing the correct combination of filter carrier and filter there are many factors to consider. Specific conditions such as high air velocities, pollutants in the air, disinfection and cleaning routines, mechanical impacts, high bioactivity, condensation, airborne chemical contaminants and required response time are some of the many considerations.

	Teflon filters	Polyethylene filters	Sintered steel filters  (stainless steel)	Wire mesh filters (metal)
Maximum temperature (consider range of application of filter carrier)	200 °C	100 °C	200 °C	200 °C
Protection against particulates	✔✔	✔✔	✔	✔
Protection against abrasives in the air			✔✔✔	✔
Pore size	10 µm	40 µm	25 µm	10 µm
Maximum air velocity [m/s] (continuous load)	50	50	70	50

✔ = low / ✔✔ = medium / ✔✔✔= high

SPA-SS	1.4301	No filter, only filter carrier	-50…100 °C
SPA-SS-PE	Polyethylene, white	40-50 µm
SPA-SS-PTFE	PTFE, white	10 µm
SPA-SS-WM	Wire mesh 1.4401	10 µm
SPA-SSS	Filter carrier incl. filter	Sintered steel 1.4404	25 µm	-100…200 °C
SPA-WM	No filter carrier, only filter	Wire mesh 1.4401	10 µm
SPA-PCB	Polycarbonate, black	No filter, only filter carrier	-50…100 °C
SPA-PCB-PE	Polyethylene, white	40-50 µm
SPA-PCB-PTFE	PTFE, white	10 µm
SPA-PCB-WM	Wire mesh 1.4401	10 µm
SPA-PCW	Polycarbonate, white	No filter, only filter carrier	-50…100 °C
SPA-PCW-PE	Polyethylene, white	40-50 µm
SPA-PCW-PTFE	PTFE, white	10 µm
SPA-PCW-WM	Wire mesh 1.4401	10 µm
SPA-PE	No filter carrier, only filter	Polyethylene, white	40-50 µm
SPA-PTFE	No filter carrier, only filter	PTFE, white	10 µm	-100…200 °C