Level Control Relay JLC-1  (Changeable for Water supply or Drainage) 

WATER SUPPLY     : Output relay will be switched to ON (pin#8 & pin#6 connected) after 0.5 sec duration when liquid level is below than E2(low level) until level reaches E1 (high level) and lasting for 0.5 sec then relay OFF (pin 8-6 disconnect) 

WATER DRAINAGE : When liquid level is higher than E1 ,output relay will be switched (pin 8-6 connected) after 0.5 sec duration , and simultaneously pump starts to drain until level is downward under E2 (low level) for over 0.5 sec then relay transferred (8-6 disconnected) to stop drainage