Mechanical, electromechanical and electronic scales
The first scales that carried the seca logo were mechanical models. Scales are still found today in the range of products that evoke memories of the classic scales, which are of course much improved. In the course of further technical development, electromechanical scales came more into use. With these products, the weight is determined mechanically, but displayed digitally. Today, electronic scales ensure precise measurement results. Practical equipment and auxiliary functions round out weighing technology.
How does a mechanical scale work?
A mechanical flat scale works as follows. The weight acting upon the platform of the scale is transferred to a load lever system. The system reduces the weight acting upon the platform to the measuring equipment by a fixed transformation ratio. A weight that presses on the platform with 100 kg, for example, is reduced to 10 kg. In other words, the transformation ratio is 10:1. The load lever system is connected to the pointer by a pinion, so that the weight is displayed directly and without delay on the round dial scale. With mechanical baby scales, free-moving weights are pushed onto a bar until balance is achieved and the result can be read.
How does an electronic scale work?
Electronic scales use various technologies to determine weight. seca uses the patented tuning fork sensor technology amongst others. This technology ensures not only accurate results, but also reduces energy consumption compared to conventional digital measurement methods by a thousand fold. The result is easily read from the digital display. The energy source is most often a battery. There are also models with a mains plug. It is important that the scale has an energy-saving automatic shutoff. Some electronic scales can display more than weight. For example, they automatically calculate the BMI value if the body size is entered in advance.
This is how measuring technique works with tuning fork sensor technology
The pitch of a violin string depends on the force that is used to clamp it. Following this principle, seca uses two opposing tuning forks connected at their ends on which a crystal has been soldered. Both crystals are operated in such a way by a suitable electronic circuit that the tuning forks continually swing. And with a pitch that depends on the force at which the ends of the sensors are pulled. The person being weighed causes the "pull".