1、Designed for monitoring liquid level in pool, well, water tower, reservoirs, tanks, etc. 2、You can set water draining mode and water supply mode. 3、Adjustable sensitivity by a knob (5-100kΩ). 4、Adjustable action time delay (0.1-10S). 5、Relay status is indicated by LED. Features: 1. Designed for monitoring liquid level in pool, well, water tower, reservoirs, tanks, etc. 2. You can set water draining mode and water supply mode. 3. Adjustable sensitivity by a knob (5-100kΩ). 4. Adjustable action time delay ( 0.1-10S). 5. Relay status is indicated by LED. 6. With small volume, 35mm DIN rail mount.                                                                                                                            Specification: Model: GRL8-02 Function: 2 or 1 level control mode Power terminal: A1-A2 Rated power supply voltage: AC/DC 24-240V(50-60Hz) Power consumption: Max. 2VA Sensitivity adjustment range: 5-100kΩ Supply voltage tolerance: -15%; +10% Voltage in electrodes: Max. AC 5V Current in electrodes: Max. 0.1mA Response time: Max. 400ms Electrode cable allows distributed capacitance (maximum): 800nF-100nF Electrode cable length: ≤100m Action delay time: 0.1s-10s (adjustable) Setting accuracy: 10% Output contact parameters: 1 x SPDT, 10A/AC1, 250VAC/24VDC Minimum switching power: 500mW Power indicator: Green LED Output indication: Red LED Mechanical life: 1x107 Electrical life(resistive load): 1x106 Reset time: Max 200ms Working temperature: -20℃~55℃ Mounting method: 35mm DIN rail Mounting altitude: ≤2000m Wiring capability: 1x 2.5mm2 or 2x 1.5mm2 Dimensions: 90*18*64mm / 3.54* 0.71* 2.52in Weight: Approx. 82g/ 2.9oz   Package List: 1 * Liquid Level Control Relay   Note: 1. Due to the difference between monitors and light effects, the pictures may not reflect the actual color of the item. 2. Please allow slight error due to manual measurement. Thanks for your understanding.