7525202 TURCK | Alldatasheet
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Edition • 2023-07-21T16:28:34+02:00 Level controller 1-channel MK91-R11/24VDC 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 con- tainer 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 re- verse 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
Edition • 2023-07-21T16:28:34+02:00 Type MK91-R11/24VDC ID 7525202 Nominal voltage 24 VDC Operating voltage 19…29 VDC Power consumption ð 0.5 W Input circuits 2 electrodes Schaltpunkt 40 kò Probe voltage ±2 V/50 μA/3 Hz Hysterese 5 % Output circuits Output circuits (digital) 1 x relay (change-over) Output switching voltage relay ð 30 VDC / ð 250 VAC Switching current per output ð 3 A Switching frequency ð 5 Hz Galvanic isolation Test voltage 4.0 kV Displays/Operating elements Operational readiness Green Switching state Yellow Mechanical data Protection class IP20 Ambient temperature -25…+60 °C Storage temperature -40…+80 °C Dimensions 89 x 18 x 70 mm Weight 78 g Mounting instructions DIN rail (NS35) or panel Housing material Polycarbonate/ABS Electrical connection 4 × 2-pin flat terminals with self-lifting pressure plates Terminal cross-section 1 × 2.5 mm²/2 × 1.5 mm² Dimensions