Crane scales
A crane scale or crane hook scale is usually used to record large masses in industry . The name comes from the purpose. The scales are hung on the hook of a crane in the classic way . The goods to be weighed are then attached to the lower hook of the scale. For example, when unloading a ship, the mass of the goods can be determined directly.
Modern crane scales have a remote control (infrared or radio) and radio remote transmission of the weighing data to a PC or printer. An integrated summing function allows the partial masses to be added up so that the total mass is obtained after the end of the discharge. The weighing ranges that can be recorded with these devices start at a few hundred kilograms and go up to 200 tons. In addition, tension measuring straps are more likely to be used.
For ships, the trimming of the hull and thus the distribution of the cargo is very important for maneuverability and safety . Therefore, when loading container ships, each container is weighed again with the crane scales and placed in such a way that the cargo is distributed in the ship according to its weight.
Crane scales are also available in a calibrated version. The calibration is a legally regulated quality test. A calibrated crane scale is required by law if it is used for pricing. For example, a calibrated crane scale is mandatory if it is used to weigh steel coils whose sales price depends on the weight. The calibration of crane scales also includes separate labeling regulations. After the test has been successfully approved by the calibration office, a crane scale is sealed so that no subsequent manipulation of the measuring device is possible. All crane scales with a payload of up to three tons must be recalibrated every two years, crane scales with a payload of more than three tons every three years.
