Will it affect the cast iron weight during testing? Let's take a look!



Temperature is a physical quantity that characterizes the degree of coolness and heat of an object, and is one of the seven basic physical quantities in the system of units. In nature, * * physical and chemical process are closely related to temperature. For example, the mechanical laboratory should be controlled at 20 (2-5) with a fluctuation of 0.5. The larger the temperature deviation, the greater the error. Therefore, in order to achieve measurement accuracy, it is necessary to first control temperature and fluctuations. In addition, as the temperature increases, the zero point of the electronic balance will shift, resulting in measurement errors. Temperature affects the calibration results of weights in many ways. In addition to the indirect change of density of air and the absorption of water vapor on the object surface, it will also cause the change of equilibrium point and unequal arm error. The temperature change is proportional to the arm length of the balance, so the temperature change will cause the beam to expand and contract, but it will cause the sensitivity of the balance to increase or decrease, and the degree of change varies depending on the material of the beam.



The balance is heated in one direction, which has a particularly serious impact on calibration. For example, the operator's hands, desk lamps, or nearby heating instruments, as well as the optical system lighting of the balance itself, may cause the balance to heat in one direction, which may affect the measurement results of the balance. Even if the temperature changes uniformly, the balance point of the balance will still move. Because the crossbeam of the balance is made of different materials, the position between the crossbeam and the support point is balanced.



Wholesale of cast iron weights



Therefore, the changes in these positions due to temperature changes are represented by the movement of the equilibrium point. The position of the crossbeam usually does not move due to temperature changes, but the problem is that the tool holder deforms the tool, causing changes in the fulcrum relative to the position, affecting the measurement deviation of the balance, and thus causing errors in the calibration results of the cast iron weight. The following is how to eliminate the adverse effects of temperature changes on the verification of cast iron weights.



Firstly, the weighing room should be equipped with air conditioning and a thermometer with a graduation value not exceeding 0.1. The thermometer should be calibrated according to the calibration cycle. The balance and weights inside the calibration room should be kept away from direct sunlight as much as possible, and dark curtains are usually installed inside the balance room. The weight should be verified in a stable environment, with a temperature close to room temperature. For E1 and E2 weights, the laboratory temperature should be 18-25 and the environmental conditions should meet the requirements of the measuring instrument.



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