Liquid Level Controller

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Information
Level Controller for liquids in tanks.
It switches on the relay in high level and switching it off in low-level values.
When high level probes are submerged a high-level indicator D7 goes on and activate P1 relay, LED D10 will also light.
Identically, intermediate level probes are also submerged in the liquid.
The relay P1 will be switched on even when high-level probes are not submerged in the liquid.
When the liquid level goes lower than the intermediate level probes, a low-level LED D9 will light.
This will result in tripping of relay P1.
Power supply: 10~16V/100mA
Low-level LED indicator.
Intermediate-level LED indicator.
High-level LED indicator.
Relay-On LED indicator.