Liquid Level Controller from GIC 4421AD1 

Will not operate if there is a power cut.

@@collectric5518 I meant what will happen in case the power goes and comes back and the relay was on to fill the upper tank but couldn't fill it due to power cut, will it resume filling and turn on as it was in previous state?

No, there is sufficient isolation between the sensor and the relay contacts.

Bohot simple hai agar aapke paas starter wala nai hai motor aur agar starter laga hai to bhi easy hi hai