corrigendum - al-63620 two wire loop powered velocity transducer two wire loop powered velocity transducer , supply of items as per following specifications , two wire loop powered velocity transducer with 4 to 20 ma dc output . for casing vibration measurement . measuring range:0 to 20 mm/sec rms . c output proportional to measuring range . supply: 12 to 30 vdc . casematerial: ss . reverse power supply polarity protection . transmitter withintrgral 5 mtr ss overbraided etfe/ pfa cable . mounting: m6 x 1 male . atex approval for intrinsic safety:required . area class exia iic t6 . hermaticallysealed . with flameproof jb for termination .