The switches have been certified for operation in SIL2 (Safety Integrity Level 2) environments. The BETA switches are the only complete range of switches in the industry to be certified to the exacting IEC 61508 safety standard, according to the manufacturer. The BETA line of pressure and temperature switches features spring-loaded, self-aligning diaphragm/piston sensors. Limited piston travel transmits pressure at the diaphragm directly to the microswitch; there are no intervening linkages or mechanisms and full protection is provided against high over-range pressure. The switches are engineered for maximum over-range protection of up to 5800 psi. The spring-loaded piston also provides resistance against shock and vibration.