The 1-channel level controller MK91-121-

R/24VDC monitors and regulates conductive liquid levels. As a dual level regulator, it

can be used to control pumps amd solenoid

valves, as monitoring device it is designed for

run-dry or over flow protection

The level controller not only provides optimum reliability in differentiating liquids, it is also suited for the distinction between foam and

liquid .

The responsivity (liquid resistance) is adjustable between 0.2 … 100 kò. One of the

four sensitivity ranges is selected by bridging

the input terminals. Then you can finetune the

switchpoint via the potentiometer at the front.

The possibility of setting the switch-on and

switch-off delay separately is very important

when dealing with turbulent liquid levels. You

can set a delay time between 0 … 20 s via the

potentiometers at the front.

Two relay outputs each with one changeover

contact are available to output the switching

commands. The output configuration of both

outputs can be changed from NC mode R (no

bridge between terminals 4/8) to NO mode A

(bridge between terminals 4/8).

The switching status of the output is indicated

by a yellow LED and operational readiness by

a green LED.

■ Responsivity: 0.2…100 kò

■ Hysteresis: 10%

■ Output: 2 relays with 1 changeover contact

■ Electronic switching of electrodes

■ Switch-on/off delay 0…20 s, separately adjustable

■ Reliable distinction between foam and liquid

■ Galvanic isolation of input circuits, output

circuits and power supply