Siwarex TASS Speed sensor: return belt mounted, 25 … 350 rpm, with 9.947 pulses/m (3.03 pulses/ft). Model: 5 pulses per revolution Fabrication: Standard polyester painted mild steel Mounting options: Complete with standard mounting kit Approval: Ordinary Locations/General Purpose (Non-Ex), CE, UKCA, RCM, EAC, KC .