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2. Power supply: Most of the weighing instruments use 220 volt AC power supply, and the allowable voltage variation range is generally 187 volts --- 242 volts. After changing the power supply line, remember that it is necessary to measure whether the voltage meets the requirements before powering the instrument. If you accidentally turn the 380 volt power supply to the meter, it may cause damage. When the power voltage fluctuates greatly, a well-regulated voltage regulator (such as a CW type AC parameter regulator) should be used to ensure the normal use of the instrument. Do not use the same power outlet with strong interference sources (such as motors, bells, fluorescent lamps) to avoid unstable meter display values. Some meters (such as HAWK watches, etc.) are AC and DC. When using dry batteries, be careful that battery leakage can damage the instrument. When not using the battery for a long time, remove the battery.
3. Grounding: Weighing instrument should be connected to a separate and good grounding wire (grounding resistance <4 ohms, grounding wire should be as short as possible). The grounding wire has a double function: it not only protects the personal safety of the operator, but also has an important anti-jamming function, which can ensure that the instrument works stably. The ground wire is connected to the instrument power socket, if the instrument ground wire is connected to the public strong Electrical protection on the ground, this may cause power disturbances to the meter, so that the meter display value fluctuations. It should be regularly checked whether the ground connection point is in good contact. Because after a long time, each connection point is oxidized, rust and the like will make the instrument virtually ineffective.
4. Sun protection: Avoid direct sunlight on the black casing of the instrument, otherwise it may damage the working environment of the instrument beyond the rated temperature range.
5. Waterproof: Under normal circumstances, although the humidity of the instrument working environment can reach 95%, it is stipulated that no condensation can occur. Except special stainless steel housing instrument with waterproof function.
6. Anti-corrosion: corrosive substances can not penetrate into the inside of the instrument, otherwise it will cause corrosion to the components on the circuit board and the circuit board itself. Over time, it may cause the instrument to be scrapped. Even the instrument with antiseptic function will have the same result if it is not closed tightly.
7. Lightning protection: Electronic weighing devices are weak systems and are vulnerable to lightning strikes and damage to components. Lightning mainly enters the instrument from two aspects: it is introduced from the power line and imported from the weighing platform via the signal cable. In normal weather, the operator only needs to operate the power switch, but in the case of a possible close lightning strike, the instrument power plug and the weighing platform signal cable plug must be unplugged. It is best to take measures against lightning strikes, such as adding surge protection devices to the instrument power circuit.
8. Anti-strong electricity: 220 volts or more of the power cord accidentally hit the scale platform or use the scale platform as the ground wire, welding operation on the scale platform may damage the instrument.
9. Cleaning: In the industrial environment, there will be dust or contamination on the meter housing, which must be wiped clean with a damp rag in case of power failure. However, be careful not to wipe the display window with solvents such as alcohol. This will deteriorate the light transmission performance and blur the display.
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Load cell maintenance precautions
1. Installation: Generally, the instrument should be placed in a clean, dry, ventilated, and temperature-friendly environment. The position of the instrument should be fixed, do not move it often, otherwise it may cause the inner lead of the signal cable plug to fall off and cause malfunction.