Definition
The thousandth electronic balance is a high-precision weighing instrument based on the principle of electromagnetic force balance, and its index value is usually 0.001 grams, or 1 milligram. This instrument is a type of precision electronic balance that can meet the needs of laboratories for accurate determination of trace sample quality. Its weighing range and accuracy design make it suitable for a variety of scientific research and testing scenarios that require high-resolution quality data.
Principle
The core working principle of a kilopercentile electronic balance is electromagnetic force balancing. When a sample is placed on a weighing tray, its gravity causes the lever mechanism connecting the weighing pan to be displaced. This displacement is detected by the position sensor and converted into an electrical signal that is transmitted to the control circuit. The circuit then generates a matching compensation current through a coil located in a permanent magnetic field. The electromagnetic force generated by the coil is in the opposite direction of the sample's gravity, returning the lever to its equilibrium position. At this point, the intensity of the current flowing through the coil is proportional to the mass of the sample, and by measuring this current and calculating it internally, an accurate mass value can be obtained. Its equilibrium relationship can be expressed as:F = k * I = m * g, where F is the electromagnetic force, k is the force constant, I is the current, m is the mass of the sample, and g is the acceleration of gravity.
Measurement method
Measuring with a kilopercentile electronic balance requires following a prescriptive process to ensure data reliability. Before measuring, the balance should be placed horizontally and warmed up in a windless, vibration-free, temperature-stable environment. Calibration is required before formal weighing, usually with standard weights. When weighing, the container should be clean and dry, and the sample should be placed in the center of the weighing tray. For samples that are susceptible to environmental influences or are subject to static electricity, appropriate measures should be taken. Readings should be taken after the displayed values have stabilized and environmental conditions are recorded. Averaging multiple measurements helps to improve the representativeness of the results.
Influencing factors
The measurement accuracy of a kilopercentile electronic balance is affected by a variety of environmental and operational factors. Ambient vibrations and airflows can cause the weighing pan to become unstable, causing fluctuations in the displayed values. Temperature changes can cause thermal expansion and contraction of mechanical components and affect circuit performance. Changes in ambient humidity can cause sample moisture absorption or disturbance of the internal components of the balance. Static electricity carried by a sample or container can generate additional forces that interfere with measurements. Balance placement uneven can disrupt the original force balance design. In addition, the magnetic and charged samples themselves interact with the balance system. Irregular actions by the operator, such as placing the sample directly by hand or touching the weighing tray, can also introduce errors.
Application:
With its high resolution, the kilopercentile electron balance plays a role in laboratory testing in numerous fields. In chemical analysis, it is used for accurate weighing of reference substances, preparation of standard solutions, and preparation of trace samples. In materials science, it is used to measure the mass of lightweight materials such as thin films and fibers, or to conduct studies such as hygroscopicity and thermogravimetric analysis. In environmental monitoring, it is used to weigh the mass of particulate matter collected on the filter membrane. In food testing, it can be used to weigh trace samples for the analysis of fats, moisture, and other components. In the electronics industry, it can be used to weigh solder paste and tiny components. Its application is based on providing reliable quality source data for subsequent quantitative analysis.
Selection
When choosing a thousandth-degree electronic balance, it is necessary to comprehensively consider the technical parameters and actual needs. The primary focus is on maximum weighing and actual indexing values, ensuring that they cover the mass range of everyday samples and provide adequate resolution. Calibration methods, such as internal automatic calibration or external weight calibration, are related to ease of daily use and long-term accuracy. The range stability and repeatability of the balance are the key performance indicators to be examined. The environment should match the protection level of the balance, such as whether it needs to be designed to resist dust and moisture. Functional requirements, such as dynamic weighing, animal weighing, percentage weighing, statistical calculations, or data interfaces that meet specific industry standards, also influence the selection. In addition, the size of the instrument, power consumption, and the availability of subsequent maintenance and calibration services should also be taken into account.