I. The heart of the Iris electronic analytical balance— the gravity electromagnetic sensor springs (generally 6-18 pieces)—is thin and easily damaged. The higher the balance's accuracy, the thinner the gravity sensor springs become. Therefore, special care should be taken to protect them during use. Do not load objects exceeding the balance's weighing range onto it. Do not press the weighing pan with your hands or drop the balance, as this may damage the balance or alter the performance of the gravity sensor. Additionally, generally avoid weighing heavy objects for more than 30 seconds. The weighing pan and its tray should be removed during handling and transportation.
II. An electronic balance is actually an instrument for measuring the gravitational force exerted by the Earth on an object placed on the weighing pan, i.e., gravity. However, due to the different latitudes and longitudes of the Earth, the gravitational acceleration (9-9.8 m2/s²) varies from place to place. The accuracy of its weighing in a localized area depends on whether it has been properly calibrated and the precision of the calibrating weights.
III. Calibration mechanisms are generally divided into three main categories:
Fully automatic calibration: It incorporates standard weights and a motor servo mechanism, and calibration can be completed in tens of seconds with just the press of a function key. Generally, new electronic balances with an accuracy of 0.0001 grams or higher use a fully automatic calibration mechanism.
Semi-automatic calibration: It contains standard weights but lacks a servo mechanism. After entering the calibration program, the calibration weights need to be manually loaded and unloaded.
Manual calibration: Balances without standard weights and servo mechanisms require manual calibration by entering the calibration program and adding external standard weights. Manual calibration is generally used for balances with lower precision.
IV. The Iris electronic analytical balance is a precision electronic measuring instrument that is highly sensitive to the environment. It should be operated with care. The mounting surface should be free from significant vibration, and it should not be placed near an air conditioning vent. If these conditions cannot be met, some improvements should be made, such as changing the location of use or installing a windproof shield. Also, be sure to adjust the leveling screws to center the bubble on the level indicator. Improper leveling of the balance is also one of the causes of weighing errors.
