Digital 4 - 20mA Ultrasonic Level Meter for Liquid with 0 - 40m Measuring Range

1. Application:

The series is an all-in-one two-wire ultrasonic level meter continuous non-contact level measurement of liquids and solids. It consists of a probe and an electronic device, both of which are leak-proof structure. This series of products can be widely used in the metallurgical industry,

chemistry, electricity.

2. Characteristics:

1) Compact continuous non-contact liquid level measurement;

2) Body design, easy installation;

3) Over-voltage, over-current protection, lightning protection;

4) LCD or LED large display window, easy to debug and observe;

5) Anti-interference ability;

6) 4-20 mA output;

7) Intelligent signal processing technology to ensure that the instrument meets all kinds of workplace

8) All metal case (IP67), sealed, alkali resistant, meet harsh environment.

3. Measuring principle: Time-of-flight method

The liquid level meter consists of an ultrasonic probe and a vacuum tube. The unit level meter is installed on the top of the container. Under the control of the electronic device, the ultrasonic probe transmits the ultrasonic pulse to the tested object. The sound wave is reflected off the surface of the object, and some of the echoes picked up by the detector are converted into electrical signals

The signal meter measures the time between sending and receiving the pulse. The time is proportional to the distance of the probe to the object under test. The electronic device detects this time and calculates the measured distance based on the known speed of sound. The level value can be obtained by subtraction.

H: installation height

D: distance value

L: level value

B: blacking distance

F: full scale

4. Technical data:

Basic data

Note: When using to measuring solid level, the most energy of ultrasonic is absorbed or scattered by solid level, so the back wave is very little, the valid measuring range of solid level is about 50% of liquid level. And the valid measuring range of solid level is determined by the installing location and rang.

The blacking distance: