EEx d IIC T4. Sira 01ATEX2007X, Sira 01ATEX4008X, Sira 01ATEX1006. EEx d IIC T4. These converters should only be used with oil-free clean dry air filtered to 5 m or less. *Inlet pressure must be at least 0.7 bar above output pressure. Explosion-proof Failsafe Type 140. Electronic current-to-pressure converter utilising advanced closed-loop operation to allow accurate high-resolution pressure control via a 4-20mA input signal. Fail-safe operation ensures that output pressure falls to zero on loss of input signal. ATEX-certified explosion-proof construction Fail-safe operation Environmental protection to IP66 Jack socket for on-site monitoring Field replaceable air filter