The MiniVLS 211/ia Intrinsically Safe Optical Speed Sensor with NPN Pulse Output Plain Stainless Steel Housing (5V DC power) is Ex-II 1G Ex ia op is IIC T4 Ga (-20°C < Ta < +40°C) certified. The certification level allows for use in a wide range of hazardous environments in petrochemical, Gas and volatile materials processing industries, ideally suited for Condition Monitoring, Data collectors in balancing applications, these sensors give excellent performance with repeatable results, engineered for easy mounting with the optional Mounting Bracket and Mini Tripod Stand in handheld applications.