Full access allows:
- Solve all tests online without limits;
- Remove all advertisements on website;
- Adding questions to favorite list;
- Save learning progress;
- Save results of practice exams;
- Watching all wrong answered questions.
136. What type of liquid level indicator which senses head or pressure requires a supply of compressed air?
Bubble tube systems measure liquid level by sensing back-pressure created by a continuous flow of compressed air; this compressed air supply is essential for operation, unlike diaphragm boxes, float type gauges, or differential pressure transmitters which directly sense pressure or head.
Comments (0)
There are no comments at the moment. If you found an error or think question is incorrect, tell everyone about it
Only signed in users can write comments
Signin