Functions: It is used to measure the dynamic state of the liquid flowing through the pipeline, such as: water, ethylene, ethylene glycol and other liquids that are not corrosive to copper. When the flow rate exceeds the set value, the fluid drives the blade and microswitch, the SPDT contact can connect the circuit and disconnect another circuit. The flow control value is adjustable, the repetition point is stable. The degree of protection is IP54, the service life of the microswitch contacts is up to 100,000 times Perfect for water treatment system, central air conditioning, water cooling. Specification: Model: HFS-20 Switch type: SPDT Material: 304 stainless steel body, copper joint, phosphor bronze bellows Weight: Approx. 401g / 14.1oz Connector: 3/4 " Max. Working pressure: 1.0 MPa Ambient temperature: 0 60 Liquid temperature: -10 100 Micro switch life: 1,000,000 times Micro switch voltage: 220VAC Micro switch current: 15A Package list: 1 * water flow switch 3 * oar 1 * User Manual Installation method: 1. Open the flow sensor 2. The switch has been set to the minimum flow rate. Turn the adjusting screw counterclockwise to increase the flow setting value. 3. Press the target to test if the DIP switch is working normally. Turning the adjusting screw clockwise can damage the flow switch. 4. After installing, please press the flow switch lever several times to check. If you do not hear a click, turn the adjustment screw counterclockwise until you hear a click. 5. The paint seal adjusting screw is only used for the first time to adjust the state of the flow switch. Please do not change or adapt it. 6. Follow three operating cycles to ensure that the switch and the system to which it is connected are operating properly and immediately cover the switch housing. 1. Before installing, please check the flow switch carefully. 2. The flow switch can be installed in horizontal pipe or vertical pipe with liquid flowing upwards, but not in a pipeline with liquid flowing downwards. When installing in an upward fluid pipeline, consider the effect of gravity. 3. The HFS flow switch cannot be used in pipelines with a liquid temperature below the drain point. 4. The arrester must be installed if there is a slam-shut valve downstream of the valve. 5. When installing the wiring, pay attention to the following: (1). It is absolutely forbidden to hit the key on the base of the switch, which leads to deformation and failure of the flow switch. (2). Disconnect power while wiring or debugging. (3). It is absolutely forbidden to adjust any screws other than the microswitch terminals and the ground screws when wiring. And by carefully connecting the wire, otherwise it is easy to change the position of the microswitch itself, causing the flow switch to fail; (4). Special grounding screws must be used for wiring, and the mounting screws cannot be removed. (5). The flow switch vane must not contact the inner wall of the pipe and other glands in the pipe, otherwise the switch cannot be reset normally.