The Doppler Ultrasonic Insert Velocity Sensor combines Doppler technology with a unique insertion design that enables operation in pipes from 4” to 100”. This form factor can easily save thousands on installation costs in large pipes while delivering the accuracy and reliability you need. Install and maintain without shutting down pipe flow, and keep your total cost of ownership low with Low-Maintenance Deployment. No calibration and no breakable moving parts mean your system is virtually maintenance free. Use in full or partially full pipes with the EchoFlo depth sensor.