Consider the following statements regarding ultrasonic flowmeters :
1. There are no moving parts.
2. They cannot measure quantities in reverse flow. flow
3. There is no direct contact with the fluid, there is no danger of corrosion or clogging.
Which of the above statements are correct ?
1
1 and 2 only
2
1 and 3 only
3
2 and 3 only
4
1, 2 and 3