Weighing instrument use maintenance precautions

It is understood that with the economic development and social progress, weighing instruments are increasingly used. How to maintain it in the process of use? What are the requirements? Everyone needs to do it in the use and maintenance, so as to ensure the safety and accuracy of the instrument and make it last longer.

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.

2. Power Supply: Weighing instruments (such as 8142, 8530, etc.) mostly use 220 volt AC power supply. The allowable voltage variation 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 instruments (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, the connection points are oxidized, rust and the like will make the meter virtually ineffective.

4. Sun protection: Avoid direct sunlight on the black casing of the instrument, otherwise it may damage the instrument working environment 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 that are vulnerable to lightning strikes and damage components. Lightning mainly enters the instrument from two aspects: it is introduced by the power line and imported from the weighing platform via the signal cable. In normal weather, the operator can only operate the power switch, but in the case of possible close lightning strikes, the instrument power plug and 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 volt or more of the power cord accidentally hit the weighing platform or use the weighing platform for the ground wire. Welding on the weighing 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 worsen the light transmission performance and make the display unclear.

10. Anti-static: Once the meter is damaged, it is necessary to repair it. Some units prefer to remove the PCB board of the instrument and send it by express mail in order to speed up the passing back and forth. This creates an anti-static problem. Take the four corners of the board when picking up the PCB board. Do not touch the pins of the manifold with your hands. Because it is easy for static electricity to damage the manifold. The removed PCB board should be immediately put into the shielding bag and can be wrapped in ordinary newspaper without a shielding bag. If you put the board on a highly insulated desktop, you may damage the PCB board. When you receive a repaired PCB and need to reinstall the instrument, you should also pay attention to anti-static electricity.

11. Anti-vibration: When the instrument is transported, it is best to place it in the crucible or take appropriate anti-vibration measures.