As a traditional level measuring instrument, the rotary resistance level switch is widely used in the detection of high and low levels of powder and particles in metallurgy, mining, chemical industry, cement and other industries. It is especially popular in chemical plants and food factories. Its working principle is to use a micro motor as the driving device, and the transmission shaft is connected to the clutch. When the material is not in contact, the motor runs normally. When the blade contacts the material, the motor stops rotating, and the motor power is cut off by itself. At the same time, the detection device outputs a contact Signal to control material transportation.

Under different working conditions, different types of resistance rotary material level switches should be selected, and the reliability of the measurement can only be ensured by selecting the type according to the field working conditions. In order to ensure the stable and reliable measurement of the resistance level switch, correct use and maintenance are also very important. The following describes the use and maintenance of the resistance rotary level switch:
1. When installing the resistance level switch, try to avoid installing it directly under the feed port, because if the material falls directly on the blade, it will easily damage the blade of the resistance level switch. When it is really unavoidable to install under the feed inlet, a protective baffle can be added to protect the blade from misoperation caused by the material impact;
2. The on-site cable should be in accordance with the corresponding specifications specified in the manual, otherwise the sealing effect cannot be achieved;
3. When the resistance level switch is installed horizontally on the side wall of the outdoor silo, the inlet of the junction box should be vertically downward, the cable fixing nut must be locked, and a rain cover can be added if the working conditions permit. To avoid rainwater seeping into the instrument case and damaging the circuit board;
4. Before installing the rotary resistance level switch in the silo, you need to confirm whether it is horizontal installation or vertical installation, oblique insertion installation or top installation;
5. When the resistance level switch is installed horizontally, the blade needs to be installed at an angle of 10-20° horizontally to reduce the impact of the material on the instrument;
6. When the process temperature exceeds 80℃, please select high temperature series products. Among them, Spin-11 resistance rotary level switch can reach 450℃, which is the industry leader;
7. When selecting blades, in addition to selecting according to the particle size of the on-site medium, you should also confirm the size of the on-site openings to ensure that the blades are smaller than the openings so that they can be installed on site;
8. During the use process, when the blades are bent, new blades should be replaced in time. (The article is taken from:, please indicate the source.)

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