Explosion Proof Compact Switch. Compact Vacuum/Pressure Switches. Series 9671X Compact explosion proof, from 1 30 inches Hg. Series 9681X. Compact explosion proof, low pressure from 1 500 psi. Series 9692X. Compact explosion proof, high pressure up to 10,000 psi. Appliions. BOP closing units; Safety panels; Pipelines; Chemical and ...