According to the classification standards of electronic weighing instruments, they are generally divided into categories such as floor scales, platform scales, floor scales, intermediate floor scales, hanging scales, belt scales, hopper scales, inspection scales, truck scales, rail scales and special scales. Among them, belt scales, hopper scales, inspection scales and special scales are usually used for internal process measurement within enterprises rather than trade measurement. Manufacturers only need to consider the accuracy guarantee of design and use. There is no need to consider anti-corrosion
Disadvantages. For table scales and platform scales, as the national legal metrology department has requirements for lead seals, the Metrology Law requires local metrology departments to conduct regular inspections and
It is more difficult for lawbreakers to take action when the legally required parts of weighing instruments are sealed with lead. And floor scales, intermediate floor scales, hanging scales, truck scales, rails
Road weights and the like, due to their large size, cannot be protected by lead seals and are usually placed outdoors, making it easier for lawbreakers to target them
Large electronic weighing instruments used for trade settlement are simply modified to achieve the purpose of making profits through measurement cheating.
To prevent the interests of customers from being infringed upon, considering the anti-cheating function of large electronic weighing instruments for trade settlement in the design and manufacturing stages has become an increasingly important issue of concern for many electronic weighing instrument manufacturers. This article will analyze the possibility of cheating in weighing instruments from the perspective of the entire measurement information chain of the weighing instrument system, and provide solutions and application examples.

Regarding cheating methods such as incomplete weighing or multiple vehicles being weighed simultaneously, the current solution is the truck scale monitoring system. Red lights are installed at both the front and rear ends of the scale. When a vehicle is not completely parked or is too close to the vehicle behind, the system will automatically prohibit weighing and report the vehicle's situation internally, allowing for a clear understanding of the vehicle's condition.
Meanwhile, the scene photos captured during the process can be called up and viewed at any time in the future.
Regarding the modification of instrument software or the difficulty of weighing management, usually only professional technical knowledge of the software source code is required. Currently, the national legal metrology supervision and administration department is conducting the evaluation in accordance with JJF1182-2007 "Evaluation Guidelines for Measuring Instrument Software"
The "South" formulates control and detection methods for legal metrology software, which will include mandatory checks such as target code archiving, verification and inspection. Therefore, both of these two types of cheating methods are to alter the measurement results by remotely controlling the transmission channel of the simulated weight signal. Can technical means be used to prevent cheating in this regard? Xu Yi's answer: Digital load cell...
The so-called digital load cell refers to the circuit board placed at the end of the analog load cell to convert the analog weight signal into a digital signal (or weight value). The original intention of the vertical sensor is to correct the interference during long-distance transmission, and at the same time, to correct some inherent weaknesses of the analog load cell such as lag, zero point temperature coefficient, and sensitivity temperature system compensation So as to achieve higher measurement accuracy.
Therefore, the detection device designed must detect once the sensor housing is opened under non-working conditions
The state. Mettler-toledo has multiple patents in this regard, and the detection circuit can detect the sealed sensor housing
Police alert. At the same time, a camera capture device is added, and the weighbridge operator is in the weighbridge room
Software cheating can only be carried out by the implementers, and there is no need to focus on preventing the drawbacks.
How can the remaining three types of variables provided by multiple vendors be integrated
A form of load cell sent to the instrument. Inventions such as numbers can be made through numbers
For digital sensors, if an attempt is made to cheat, there are two methods: 1) Analog cheating. After the first cheating method, the system can self-detect the device
There will definitely be changes. The welding and sealing of digital sensors must be achieved.
The sensor housing is determined by the degree of the sensor housing being opened and the relative humidity inside the housing [Patent ZL200610039728.0, ZL200620068653.4]. Even if the sensor housing is opened and re-welded to restore it, the high-precision detection circuit can still detect the abnormality and alarm.