Level Measurement

Types of level measurement

There are two methods used to measure Level

1. Direct method
2. Indirect method

Direct method:-

direct level measurement is simple, almost straightforward and economical; it comprises direct measurement of height from reference line and used some local level indication. it is not easily adopted to signal transmission techniques for remote indication or control.

some of direct level measurement techniques are

1. Dip stick method
2. sight glass
3. chain or float gauge

Indirect method:-

Indirect method of level measurement depends upon the material having physical property  which can be measured and relate to the Level. Many physical and Electrical properties used for this purpose and are best suitable for remote transmission. this type of level measurement employs latest technology in its measurement.

some of indirect level measurement techniques are

1. capacitance level measurement - for continuous level measurement

2. Hydro static principle for level measurement or differential pressure level measurement (point level detection)

3.Ultrasonic and radar level techniques (continuous level detection)

4. zero elevation and suppression (normally used when mounting position for sensor is unknown)

5. Vibrating fork type level measurement.( point level detection)