MIA-LIDEC 液位报警开关

GENERAL

MIA-LIDEC is an alarm sensor using an acoustic wave. As com- pared with the conventional float type, the detection is made without a moving part, resulting in the excellent durability and reliability. MIA- LIDEC is optimum for the level detection of high and overflow alarm on crude carrier, product carrier etc.

 

 

OPERATION PRINCIPLE

LIDEC sensor, which generates the acoustic wave by the PZT ele- ment, is placed at the top position of MIA-LIDEC, and the acoustic wave is sent to a metallic rod.

 

The head of the metallic rod has such a structure as the acoustic wave can be easily diffused. When detecting liquid does not exist around the head of the metallic rod, the acoustic wave is reflected at the head of LIDEC sensor and returns to electronics.

When the liquid level goes up and the liquid exists at the head of metallic rod, the acoustic wave is propagated and absorbed into the liquid without returning to electronics.

 

The circuit which distinguishes the existence of a reflective acoustic wave is established in the electric circuit part. The existence of the liquid at metal rod head is detected.

In an electric circuit, the existence of this reflective acoustic wave is changed into the current signal (6mA / 18mA) , and alarm status is transmitted to remote place by the signal loop of two-wire system.