Does the analytical balance need desiccant? This will solve your doubts

Is there any desiccant in the dust cover of the analytical balance? Let's take a look at the mainstream answers online.

A: Do not place desiccant in the windshield. Because the presence of desiccant will cause air convection in the windshield and affect the weighing, in addition, desiccant will also increase the generation of static electricity. As long as the electronic balance is powered on for a long time, the instrument will automatically volatilize the moisture in the case, so there is no need to worry about the damage of moisture to the instrument. However, the last inspection by the Inspection and Quarantine Bureau said that the electronic balance needed desiccant. What exactly is the procedure.

B: Put desiccant well. On the one hand, keep the environment in the balance chamber dry, which is very important for electrical equipment. On the other hand, when weighing the sample in the dryer, keep the same as the environment in the dryer, which is conducive to fast reading and reduce the impact of moisture absorption on the weight of the sample

D: The electronic balance has strict requirements for the environment. A bottle of silica gel can only ensure the drying of the weighing box, and it has no effect on the sensor. I think the external environment should be controlled well, and the silica gel should not be put.

E: In the past, in the analytical balance, there were weights inside the photoelectric balance. Damping (especially weights) would cause inaccurate weighing. The principle of the current electronic balance is the pressure sensor, which keeps the temperature stable by energizing. If the humidity and temperature inside the balance are different from those outside, will it be the same if it is weighed inside and used outside?

When the electronic balance is used with a precision of 0.01mg, the desiccant cannot be placed. Because of the existence of desiccant, there is a slight air flow in the balance, which makes the balance unstable. The balance should not be too dry because it will cause static electricity. In a word, first, there are installation requirements for the electronic balance, and the ambient humidity must be less than 65%; Second, there is no explicit stipulation that desiccant must be placed in the electronic balance; Third, the different humidity inside and outside the balance and the different specific gravity of air are easy to cause data fluctuations.

According to the instructions of different models of analytical balance from different manufacturers, it was not mentioned that desiccant should be added.

The most correct way to solve this problem and the ****** answer of experts should be:

1. When carrying out general weighing operation: do not place desiccant in the windshield. Because the presence of desiccant will cause air convection in the windshield and affect the weighing, in addition, desiccant will also increase the generation of static electricity. As long as the electronic balance is powered on for a long time, the instrument will automatically volatilize the moisture in the case, so there is no need to worry about the damage of moisture to the instrument.

2. When weighing the sample taken out of the dryer, it is necessary to put the desiccant into balance for a period of time before weighing! Because this keeps the same environment as that in the dryer, it is conducive to fast reading and reduces the impact of moisture absorption on the weight of the sample.

3. If the balance room is equipped with a humidity adjustment device, it is not necessary to place desiccant in the windshield at all. It is sufficient to control the ambient humidity below 65%.

Therefore, it can be concluded that there is no need to put desiccant into the mainstream electronic analytical balance on the market at present.