Vent Filter
Vent Filters provide the highest accuracy capability and utilize indicating desiccant to prevent moisture from entering the vent tube and damaging transducers with vented gage reference pressure format. The desiccant will turn from blue to pink when exposed to moisture indicating the need for maintenance. All vented gage transducers are shipped with our SuperDry™ Vent Filter.  This latest vent filter design prevents moisture from entering the vent tube for at least one year without maintenance, at no additional cost.  Spare filters may be ordered. The vent filters are 6.0 in (15.3 cm) long with a 0.75" diameter.

Aneroid Bellows
The Aneroid Bellows is a maintenance-free alternative to desiccant filters for moisture protection on vented gage transducers. Made of flexible neoprene material attached to a polycarbonate mounting bracket, the bellows fluctuates with changes in atmospheric pressure maintaining a constant barometric reference. Note that the use of the bellows results in a closed reference pressure system subject to zero shift errors induced by changing temperatures of up to 0.003 psi/ºC. The bellows is not recommended for use with accuracy requirements of ±0.25% FS or better, nor for ranges < 2 psi.