Electronic balances are very common instruments for every person working in the laboratory, but sometimes people will worry about such instruments because of the problems of weighing instability, data drift and so on. What is the cause of this phenomenon? What kind of solution is there?
Through dismantling, we can see that the electronic balance is a precise electromechanical instrument, which is more delicate and requires more operating procedures. The problem often encountered in use is that the weighing result is unstable. Many problems are caused by the operation of the environment. It is not necessarily a hardware failure. Below we summarize several common situations where the weighing result is unstable:
(1) The position of the balance is unreasonable
When the balance is in use, doors and windows should be closed. If there is a wind blow, or if there are other instruments that produce vibrations on the bench, the readings of the electronic balance will be unstable. Pay attention to the impact of vibration caused by the construction of the nearby infrastructure and the decoration of the next door.
(2) The increase or loss of moisture in the test sample
Some samples are volatile or have strong hygroscopicity, causing the quality of the sample to increase or decrease during the test. In this case, the solution is to use a vessel with a small diameter. The volatilization and moisture absorption of the sample are reduced while the operation time is short, so that the weighing result is more accurate.
(3) Sample and container temperature
The effect of temperature on the results of the weighing of the electronic balance is very large, so the electronic balance is generally required to work in a constant temperature and humidity room, and the warm-up time should be sufficient. However, the sample or container just taken to the laboratory has an unstable reading due to the difference between its temperature and the ambient temperature of the electronic balance . Some high-end balances usually have fully automatic calibrations. If the scales of those outside schools are calibrated manually when the temperature changes.
(4) Electrostatic phenomena of samples and containers
Electrostatic phenomena can also cause the electronic balance to be unstable. It is highly insulating materials (most weighing containers made of glass or plastic) that are prone to static electricity. If possible, use metalware. If the phenomenon of static electricity can not be eliminated, it is still necessary to check whether the ground wire of the instrument is connected.
(5) The sample or container is magnetized
Both the magnetization of the sample and the container may have misled the balance so that the magnetic force it receives is due to the gravity of the sample. Therefore, we often perform degaussing when using ironware. It is usually necessary to avoid strong magnetic fields near the electronic balance . Non-electromagnetic type balances are used for materials with strong magnetic properties.
(6) The influence of electromagnetic wave emitters such as mobile phones cannot be ignored
Practice has proved that when a high-precision electronic balance is working, if the mobile phone is too close to it, it will interfere with the measurement results. (At the time of this balance work, the mobile phone dials and approaches and there is a numerical interference of 1 mg). The use of mobile phones in the electronic balance room should be prohibited. Electromagnetic ovens, microwave ovens, ultrasonic cleaning machines and other electromagnetic appliances with large electromagnetic radiation should not be installed. They should be kept away from communication base stations.
In addition, the electronic balance converts the gravity generated by the mass of the object into the electrical signal through the sensor to represent the quality of the object being weighed. The weighing result is essentially the size of the object's weight, so it is related to the acceleration g, and the weighing value increases with the increase of latitude. For example, if a 100g object is weighed with an electronic balance in Beijing, it will reach Guangzhou. If the electronic balance is not calibrated, the weighing value will be reduced by 137.86 mg. The weighing value also decreased with altitude, and there were netizens comparing the weighing of the 1st floor and the 4th floor (up to 10 meters). The same weight was 200g. The weight of the fourth floor was reduced by 0.00063g. Therefore, the electronic balance must be calibrated after installation or after it has been moved.
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