Jiantong Hardware is also focused on manufacturing various sheet metal enclosures. Material scope include copper, Iron, Aluminum, Stainless steel and Spring steel with various of function and thickness. Surface treatment we are capable to process contains electro plating, powder coating ,painting,electrophoresis, sand spraying, brushing, anodizing, polishing, passivation, silk screen, laser cutting....etc. Final products are electrical metal steel cabinet, metal case, electric enclosure, Junction box, storage box, switch box, sheet metal housing, metal case.
In order to fully meet internal market and customers requirements,we control quality from source beginning,like product design, technical support, supplier election, etc. All materials are of RoHS & Reach compliant. Meanwhile, we brought in advanced testing equipment such as 2D tester, projector, Salty Spray Tester, coating thickness tester, sclerometer and so on, which can enhance testing and quality controlling ability in further.
Sheet Metal Enclosure,Metal Enclosure,Stainless Steel Enclosure,Metal Enclosure Box Nanpi Jian Tong Hardware Manufacturing Co., Ltd. , https://www.sheetmetals.nl
Weighing instruments are the most widely used measuring instruments in people's lives. People use them to measure the weight or quality of objects. In physics, mass, length, and time are three basic physical quantities. The concept of "quality" was introduced by Newton as a "physical quantity" around 1700 as a classical mechanics, used to describe the "inertia" of objects in motion, and our senses cannot directly sense quality. But as early as two or three thousand years BC, people knew the principle of lever balance, that is, using a simple arm balance to measure the weight or mass of the object. Today's various weighing instruments are also measuring instruments that measure the quality of objects. The weight is an calibrator for quality measurement, and it passes the standard mass of the contracted kilogram reference weight to various weighing instruments to unify the mass value.
Most types of weighing instruments can be calibrated using weights. For weighing instruments that cannot be calibrated directly with weights, such as automatic scales such as belt scales, indirect methods are also required to enable the calibration value to be traced back to the kilogram reference weight. The weighing value of the calibrated instrument can be traced back to the kilogram reference weight, which is the basic element of the instrument calibration. Another basic element of instrument calibration is that the method and procedure for calibration should be consistent with the actual weighing process of the instrument. That is to meet the principle of "accuracy, consistency, and correct use" of our measurement. As for temperature, humidity and other factors and interference factors, it is based on the environmental conditions used by the instrument.
For the verification of large scales, several tons to several tens of tons of weights are required. Both the user and the measurement department at the grass-roots level often do not meet the requirements of the statutory check quantity. On the other hand, it is also a common problem for users to send these weights to the measurement department on a regular basis. This is a laborious, time consuming and costly matter. The use of weight comparators (high-precision large scales) to verify large weights by comparison with high-precision weights has been recognized by everyone, so conditional users can use this method to verify the weight used, and even The purchase device is self-certified, and it is only required to periodically send the device to the metrology department for verification. 
In recent years, foreign non-mandatory management instruments, that is, instruments used in the production process, use digital systems to achieve calibration without weights. Another method is to use the function of the display to amplify the weighing display value when the display is calibrated. For example, the PR1720 Fieldbus Transmitter has this function, which can amplify the resolution of the indication by 100 to improve the accuracy of the calibration point of the weight. , can reduce the number of calibration weights. These two methods are effective for some well-designed scales, such as bucket scales, tank scales, and a large number of process scales used in steel and metallurgical industries.