The Micronics UF D5500 clamp-on sensor is mounted on the outside of any pipe 12.7mm / ½ inch diameter or larger. To measure velocity an acoustic signal is reflected back to the sensor from moving particles or gas bubbles suspended in the fluid. Flow is calculated based on configured pipe ID. Installation is easy – without shutting down the flow system. No contact is made with the moving fluid and no pipe cutting or drilling is required. There is no fouling or scale build-up on the sensor. The Micronics UF D5500 Doppler Flow Meter includes an ultrasonic sensor, an easy to use 5-key calibration system, a large digital flow rate display with totaliser, isolated 4-20mA output, 26 million point data logger, and two programmable control relays. The sensor is classified as non-incentive and an intrinsically safe sensor is optional.