The μmes® Zone separator FT-D is used for the zonal separation in connection with our differential-relative-pressure measuring devices for the measurement of mediums of the dust-EX-zones 20, 21 or 22. The filter FT-D is equipped with a stainless-steel filter element which is permeable for the air of the air-dust-medium but corresponding IP6X impermeable for the dust, why filter FT-D inside fulfills between both connection ports E and A the protection class IP6X corresponding DIN EN 60529. The housing of the μmes® Zone separator FT-D fulfills the protection class IP67.