A field device for use in an industrial process, comprising: a housing having a cavity formed therein and comprising a first compartment, a second compartment and a third compartment; a humidity-sealed electronics module (126, 200, 300, 400, 500) having said third compartment formed therein, the humidity-sealed electronics module (126, 200, 300, 400, 500) positioned in the cavity and including a first seal board (210, 302, 416, 420, 516, 520) and a second seal board (210, 302, 416, 420, 516, 520), wherein the first seal board (210, 302, 416, 420, 516, 520) separates the third compartment of the humidity sealed electronics module (126, 200, 300, 400, 500) from said second compartment in the housing and forms a humidity seal therebetween, and wherein the second seal board (210, 302, 416, 420, 516, 520) separates the third compartment of the humidity sealed electronics module (126, 200, 300, 400, 500) from said first compartment in the housing and forms a humidity seal therebetween; a first electrical component in the first compartment mounted to the first seal board (210, 302); and a second electrical component in the second compartment electrically connected to the first electrical component; characterized in that: the first and second seal boards (210, 302, 416, 420, 516, 520), are multi-layered with at least one of the layers formed of a material that prevents humidity travelling through the seal boards, and in that the first and second seal boards (210, 302, 416, 420, 516, 520) are sealed to a side wall of the humidity sealed electronics module, wherein the seal boards (210, 302, 416, 420, 516, 520) are sealed to an interior wall of the housing or to an interior ring of the housing. a housing having a cavity formed therein and comprising a first compartment, a second compartment and a third compartment; a humidity-sealed electronics module (126, 200, 300, 400, 500) having said third compartment formed therein, the humidity-sealed electronics module (126, 200, 300, 400, 500) positioned in the cavity and including a first seal board (210, 302, 416, 420, 516, 520) and a second seal board (210, 302, 416, 420, 516, 520), wherein the first seal board (210, 302, 416, 420, 516, 520) separates the third compartment of the humidity sealed electronics module (126, 200, 300, 400, 500) from said second compartment in the housing and forms a humidity seal therebetween, and wherein the second seal board (210, 302, 416, 420, 516, 520) separates the third compartment of the humidity sealed electronics module (126, 200, 300, 400, 500) from said first compartment in the housing and forms a humidity seal therebetween; a first electrical component in the first compartment mounted to the first seal board (210, 302); and a second electrical component in the second compartment electrically connected to the first electrical component; characterized in that: the first and second seal boards (210, 302, 416, 420, 516, 520), are multi-layered with at least one of the layers formed of a material that prevents humidity travelling through the seal boards, and in that the first and second seal boards (210, 302, 416, 420, 516, 520) are sealed to a side wall of the humidity sealed electronics module, wherein the seal boards (210, 302, 416, 420, 516, 520) are sealed to an interior wall of the housing or to an interior ring of the housing. the first and second seal boards (210, 302, 416, 420, 516, 520), are multi-layered with at least one of the layers formed of a material that prevents humidity travelling through the seal boards, and in that the first and second seal boards (210, 302, 416, 420, 516, 520) are sealed to a side wall of the humidity sealed electronics module, wherein the seal boards (210, 302, 416, 420, 516, 520) are sealed to an interior wall of the housing or to an interior ring of the housing.