State any two advantages of ultrasonic flow meters.
Advantages of ultrasonic level measurement:
1. Offer no obstruction to the flow
2. o/p is insensitive to variation in viscosity, density and temperature
3. No moving parts
4. Linear relationship between o/p and i/p
5. Used for bidirectional flow
6. Excellent dynamic response
7. Good accuracy +-2%
8. o/p is electrical
9. It is used as non-contact method of flow measurement.