Liquid level monitoring relay MRL01

MRL01 is a double function level relay designed to control maximal and minimal level of conductive liquid in the vessel.

The relay can be used to pump liquid up (function UP) or to pump liquid down (function DOWN). In case that the vessel is made from conductive material it can be used instead of GND probe.

The relay uses for measurement AC current which avoids electrolysis and probes oxidation. The relay has one double-throw output contact 8 A.

• two functions: pump UP or pump DOWN
• time hysteresis for liquid waves limitation
• AC signal to avoid electrolysis and probes oxidation
• probes error diagnostic
• universal power supply 89 ... 264 VAC
• DFT (Discrete Fourier Transformation)
• digital optical operation status signalisation

If the level decreases below the minimal limit and it remains that way for the time of 5 s at least, the relay will start the pump-up process. In the moment after the maximal limit being exceeded for more then 5 s, the relay stops the pump-up process.

If the level exceeds over the maximum limit and it remains that way for the time of 5 s at least, the relay will start the pump-down process. In the moment after the minimal limit being exceeded for more then 5 s, the relay stops the pump-down process.