This displacement transducer measures the vertical displacement of civil engineering structures such as bridges. It is connected to a reference water tank at an immovable point by a connecting pipe, and measures the displacement with respect to the water surface in the tank. 
Inside the displacement transducer is a detector that constantly detects and tracks the water surface using a servo mechanism, and a circuit that electrically converts the amount of movement of the detector. 
The displacement of the structure is measured as the relative displacement of the reference water surface to the displacement transducer. 
Our data logger is used for measurement, allowing automatic measurement of multiple points. 
A servo mechanism is used to detect the reference water surface, and the circuit stability has been further improved to ensure stable measurement over a long period of time. (Built-in arrester) 

Protection class IP 54 or equivalent