Xh-m203 Schematic =link= -

The is a fully automatic water level controller module designed to regulate water pumps and valves by monitoring liquid levels via dual sensors. Operating on a 12V AC/DC power supply , it features a robust 10A relay that automates refilling or drainage tasks to prevent overflows and dry running. XH-M203 Schematic and Operation

You set 5A, but 10 minutes later it reads 6.5A. Cause: Thermal runaway in the op-amp or the shunt. The LM324 has input offset voltage drift. As the MOSFET heats up, the shunt heats up (positive temp coefficient). The op-amp tries to compensate but overshoots. Fix: This is a schematic design flaw. Add a small heatsink to the LM324, or replace the 0.1Ω shunt with a 0.05Ω, 10W resistor to reduce self-heating. xh-m203 schematic

: Two sets of terminals for high-level and low-level float switches or probes. Wiring & Connection Guide The is a fully automatic water level controller