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    Liquid Level Control Relay, Level Monitoring, SPDT, AC/DC 24-240V

    Liquid level control relay is a key automated liquid level monitoring component. The SPDT design of the liquid level control relay allows the relay to switch between two independent load circuits, such as pump start stop control or alarm signals, when the liquid level changes. This liquid level control relay is compatible with both AC and DC power sources, with a wide voltage range from 24V to 240V, making it suitable for most industrial power supply environments.
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    Liquid level control relay is a component specifically designed for automated liquid level monitoring, which achieves precise control of liquid level through SPDT switches and can operate reliably within the voltage range of 24-240V under AC and DC power sources. Designed for monitoring level in wells, basins, reservoirs, tanks. When the liquid level reaches the preset high and low threshold, it will automatically connect or disconnect the circuit, ensuring the safe operation and effective management of the equipment. 


    • ln one device you can choose the following configurations: 2 level control mode or 1 level control mode.
    • Choice of function PUMP UP, PUMP DOWN.
    • Adjustable time delay on the output (0.1-10s).
    • Sensitivity adjustable by a potentiometer (5-100kΩ).
    • Galvanically separated supply voltage AC/DC 24-240V.
    • Relay status is indicated by LED.
    • 1-MODULE, DIN rail mounting.



    Model ATO-GRL8-02
    Function 2 or 1 level control mode
    Supply terminals A1-A2
    Voltage range AC/DC 24-240V (50-60Hz)
    lnput max.2VA
    Supply voltage tolerance -15%; +10%
    Sensitivity (input resistance) adjustable in range 5 kΩ-100 kΩ
    Voltage in electrodes max.AC 5V
    Current in probe AC<0.1 mA
    Time response max.400 ms
    Max.capacity length 800 m (sensitivity 25 kΩ), 200 m (sensitivity 100 kΩ)
    Max.capacity of probe cable 400 nF (sensitivity 25kΩ), 100 nF (sensitivity 100 kΩ)
    Time delay (t) adjustable, 0.1-10s
    Accuracy in setting (mechanical) ±10 %
    Temperature coefficient 0.05%/℃, at=20℃ (0.05%°F, at=68°F)
    Output 1×SPDT
    Current rating 10A/AC1
    Switching voltage 250VAC/24VDC
    Min.breaking capacity DC 500mW
    Output indication red LED
    Mechanical life 1×107
    Electrical life (AC1) 1×105
    Reset time max.200ms
    Operating temperature -20℃ to +55°C (-4°F to 131°F)
    Storage temperature -35°C to +75°C (-22°F to 158°F)
    Mounting/DIN rail Din rail EN/IEC 60715
    Protection degree IP40 for front panel/IP20 terminals
    Operating altitude ≤2000m
    Operating position any
    Overvoltage cathegory Ⅲ.
    Pollution degree 2
    Max.cable size (mm2) solid wire max.1×2.5 or 2×1.5/with sleeve max.1×2.5 (AWG 12)
    Dimensions 90×18×64mm
    Weight 81g
    Standards GB/T 14048.5, EN 60255-1


    Wiring Diagram

    Liquid level control relay wiring diagram

    Functions Diagram

    Liquid level control relay functions diagram1Liquid level control relay functions diagram2Liquid level control relay functions diagram3

    Panel Diagram

    Liquid level control relay panel diagram

    Dimensions (mm)

    Liquid level control relay dimensions

    Tips: Working principle of the liquid level control relay

    A liquid level relay is a relay that controls the liquid level and has electronic circuits inside. Utilize the conductivity of liquids, when the liquid level reaches a certain height, the relay will act to cut off the power supply. Turn on the power to start the water pump when the liquid level is below a certain level. Achieve the function of automatic control. Automatic control consists of sensors and control actuators. The sensor of the liquid level controller is usually a wire. Utilize the conductivity of water. Water has poor conductivity and cannot directly drive relays. So electronic circuits need to amplify the current to drive the relay to work.

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