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This post was last edited by shrien on 2019-6-9 at 19:47. The fork-type level switch is primarily used to provide alerts and control for liquid levels at upper and lower limits. It is widely applied in various fields of industrial automation control, such as food and beverage processing, pharmaceuticals, chemicals, and water treatment. It is simple to use and requires no maintenance; as long as it is installed correctly, it can operate reliably. By following the relevant precautions during installation, it is possible to **increase the lifespan and accuracy of the alerting function of the fork-type level switch, avoid false alarms, and ensure better performance of this device, with no need for maintenance throughout its usage period. Firstly, during installation or movement, try to avoid touching the fork tip with your hands, and be careful not to let the fork tip collide forcefully with hard objects, as this could cause deformation of the fork tip and lead to inaccurate measurements. Secondly, during installation, if it is installed sideways, it is necessary to ensure that the two prong surfaces point vertically downward. This prevents the tuning fork head from being subjected to pressure from the liquid being measured, and it also helps the viscous liquid to drip off quickly, thereby ensuring measurement accuracy and extending the lifespan of the tuning fork level switch ； When measuring flowing liquid in a pipeline, during installation it is necessary to ensure that the parallel surfaces of the two prongs are aligned with the direction of fluid flow ； Whether installed from the top, the side, or through pipes, it is necessary to ensure that the cable hangs downward or is bent, in order to prevent water from entering the cable connections and damaging the fork-type level switch. Regarding wiring: each instrument is equipped with a set of relay contacts (SPDT), which are single-pole double-throw. The relay functions merely as a switch and cannot directly drive alarms or other devices with higher power consumption. All control signals are output from the terminal block at the top of the electronic unit. A green light indicates that the relay is working properly, while a dark light indicates that the relay is in alarm mode (the relay is also in alarm mode when there is a power outage or a fault with the instrument). Open the upper cover of the housing; inside are the wiring terminals, toggle switch, light-emitting diode LED, and sensitivity adjustment knob. Turning the sensitivity adjustment knob clockwise reduces sensitivity, while turning it counterclockwise increases sensitivity. It is usually pre-set at the time of manufacture and requires no adjustment; for high-viscosity liquid media, the sensitivity is generally reduced. There are many types of level switches, but their wiring methods are generally similar. Below are the wiring steps for a fork-type level switch: For explosion-proof instruments, it is only permissible to open the outer cover for operation when there are no explosive gases or dusts present in the environment. Please follow these steps: (1) Open the casing cover ； (2) Loosen the lock nut on the cable threaded connector ； (3) Remove about 10 cm of the outer insulation from the connection cable, as well as about 1 cm of the insulating layer from the ends of the core wires ； (4) Pass the cable through the cable threaded connector and insert it into the housing ； (5) Use a screwdriver to open the terminal block ； (6) Insert the ends of the core wires into the terminal blocks according to the wiring diagram ； (7) Tighten the terminal block with a screwdriver ； (8) Check whether the connections are secure by gently pulling on the connected cable ； (9) Tighten the lock nut of the cable threaded connection and secure the sealing ring ； (10) Screw on the housing cover. Generally speaking, as long as it is installed correctly using the methods outlined above, a tuning fork level switch can operate stably and reliably. It is not only simple to install and easy to use, but also requires no maintenance during operation, making it a very hassle-free and durable level measurement instrument. Jiangsu Huike Automation Instrument Co., Ltd. can provide you with professional advice on product selection as well as reliable product services. If you have any questions, feel free to call us; our professional technical staff will be happy to assist you. We hope this can be helpful to you!