The expansion difference is the relative thermal growth between the shaft and the machine housing. During the start-up and shutdown of the steam turbine, due to the difference in metal materials, thermal expansion coefficient, and heat dissipation, the shaft thermal expansion may exceed the shell expansion. If the shaft thermal expansion exceeds the allowable clearance specified in the machine, friction will be generated. At high speeds, friction can cause catastrophic damage. The expansion monitor is specially designed for large turbo-generator set. With the help of monitoring expansion, necessary alarm or stop measures can be taken before friction occurs.
· Input power protection function.
· You can set alarm parameters, range, relay delay and other parameters by pressing the button.
· The set parameters will not be lost after power loss.
· Zero correction function, ensure the mechanical zero and instrument zero consistent.
· Sensor break detection, sensor break, block relay output, OK light out.
· Sensor power current limiting protection.
· Sensor signal buffered output.
· Lock the relay output within 10 seconds after power-on.
