Weighing electronic balances to avoid airflow and static interference

Weighing electronic balances to avoid airflow and static interference

Weighing electronic balances is an important step in laboratory testing. Weighing as the basis for data is the basis for obtaining the correct results of Zui. How do you get accurate weighing results during normal trials? There is no doubt that this first requires high-quality electronic balance instruments, followed by the correct operation of the personnel, the environment used by the balance after the balance, etc. However, due to the limitations of the use conditions, we usually can't get the good weighing environment of Zui. Let us cite the application of the electronic balance in the following special environments, which may help and inspire your work:

1. Effects in an unstable airflow environment:

Some users' weighing environment is very susceptible to unstable airflow, such as frequent personnel access and weighing of toxic and hazardous substances in a fume hood.

For example, one company produces tungsten wire and molybdenum wire every day. They must randomly check more than 5,000 samples taken every day. The inspectors are particularly frequent in the balance chamber, and the weight of the sample is light and the error requirement is small. The user often carefully checks before purchasing the electronic balance. Zui finally purchased the German Sartorius ME5 electronic balance. The Sartorius ME5 balance has electric airflow protection measures. The door of the electronic balance weighing room can be adjusted to the leeward direction at will. This user added a hood to the outside of the balance to ensure local airflow stability. The problem of weighing that has plagued them for many years has been lifted.

This is a typical case where the electronic balance is weighed by airflow. At present, there is a new solution to avoid weighing airflow interference: some users can use the safety weighing cabinet SWC, which can build a closed area environment around the laboratory balance, which can avoid air or fine. The overflow of the powder particles, the constant airflow rate of the airflow in the safety cabinet and the low turbulence, can fully guarantee the consistent and repeatable weighing result. The application of the grille balance of the grid-shaped weighing plate is also an application case for reducing the influence of airflow. The end of the experiment shows that the grid balance can effectively avoid the influence of airflow even without the windshield. The electronic balance with readability of 10mg and 100mg can effectively avoid the airflow.

2. Strong static interference environment

Electrostatic interference is often encountered in unusually dry environments, powdered sample weighing, and filter paper weighing. Under electrostatic interference, electronic balance readings are difficult to stabilize, and readings appear to increase or decrease, making it difficult to obtain accurate Weigh the results. Static electricity is actually a phenomenon in which the positive and negative charges of atoms are caused by changes in energy (such as kinetic energy, thermal energy, chemical energy, etc.) caused by friction under external influence. In daily operation, friction cannot be avoided, so static electricity is also inevitable. How do we eliminate the effect of static electricity on the weighing of electronic balances?

In addition to ensuring proper humidity, some users use electronic sample tanks to extract static electricity as soon as possible. However, some users cannot choose weighing containers. For example, users who use filter paper weighing most of them use special weighing chambers, such as special metal and semi-high weighing chambers, which can effectively extract static electricity and reduce airflow. Impact.

In addition, some users use external static elimination equipment to avoid static interference, such as: static elimination pen. The static elimination pen is suitable for small sample containers and filter papers. This method is economical, effective and convenient. Some users who use older models have a larger sample volume and they use an ionizer to shield the static charge. For users who use modular Cubis balances, the windshield with electrodes on the back plate is used directly to form a stable electrostatic field to eliminate static interference.