The 1-channel level controller MK91-

R11/24VDC regulates conductive liquid levels.

Electrodes connected to the device analyse

the resistance of the liquid against the container mass.

A square-wave AC voltage signal is applied

to the electrode. This enables DC-free and

therefore electrolytic-free measurement of the

liquid resistance.

The device has a relay output with a

changeover contact.

The switchpoint of the level controller is set to

Rm = 40 kò (different values on request). If the

response sensitivity falls below the set point,

the relay is energized with a delay of 10 s.

The switching status of the output is indicated

by a yellow LED and operational readiness by

a green LED.

The device provides protection against reverse polarity and transient surge protection.

■ Switching point at 40 kò

■ Hysteresis approx. 5

■ Output: Relay with 1 changeover contact

■ Complete galvanic isolation

■ Input reverse-polarity protected