The use environment of the balance must strictly follow the requirements of its manual, national standards or verification procedures, and meet the environmental requirements of measurement accuracy. Factors such as temperature, humidity, vibration, dust, etc. can interfere with the measurement results, so environmental control is the basis for accurate weighing.The balance room should be dust-proof, and the doors and windows should be closed to prevent dust from entering the balance and polluting the parts. To stay away from vibration sources such as forging workshops and railways, the sky platform needs to be stable and independent, and the high-precision balance also needs additional anti-vibration measures; The temperature fluctuation should be controlled within 0.5~1°C every 4 hours, away from heat sources and direct sunlight, and equipped with a thermohygrometer to monitor the environment. There should be no obvious air flow and corrosive gas indoors, and the light should be bright and uniform to ensure clear observation during operation.
Preparation before use
Before using the mechanical balance, it is necessary to clean the dust of the weighing plate and the bottom plate, check and adjust the level, ensure that the riding code is at the zero position, the hanging code index dial is accurate, and after calibrating the no-load zero point, open the side door to let the internal and external temperature balance for 5~15 minutes. The electronic balance needs to be powered on and warmed up for at least 30 minutes in advance to allow the electronic components to reach a stable state.
These preparations reduce the impact of the environment and the initial state of the equipment on the measurement and are the first step in ensuring weighing accuracy.
Operating specifications
After opening, do not pick up and place items, adjust weights or open and close the door on the weighing plate to avoid impact damage to the balance. At the same time, the balance is strictly prohibited from being overloaded to prevent failures such as beam deformation.
When weighing, in addition to weights, items should be stored in clean utensils, moisture-absorbing, volatile and corrosive items should be sealed, and over-cold and heated objects should be weighed after temperature balance to prevent contamination of the balance or measurement deviation caused by temperature difference.
The selection of weights should follow the order of "from large to small", starting from the weight close to the quality of the item, do not completely open the balance before balancing, and close the operation in time when it is determined that it needs to be adjusted, which can not only improve efficiency, but also protect the balance edge.
When reading, it is necessary to accurately read the stop point or turning point of the pointer, estimate to one-tenth of the minimum index, and the mass of the object is the sum of the mass of the weight, hanging code, riding code and ruler to ensure that the data is recorded correctly.
Routine maintenance
The balance room needs to be dedicated, keep clean and dry, prohibit knocking, dining, smoking, etc. indoors, implement a shoe change system to reduce dust, and use a mop to mop the floor to avoid excessive humidity to provide a stable storage environment for the balance.Each balance should establish a technical file, which should be kept by a special person to record calibration, maintenance, faults, etc. in detail, so as to facilitate tracking the status of the equipment and detect potential problems in time.
After use, it is necessary to clean the residue of the weighing tray and the bottom plate in time, put the weights back in place and count the quantity, return the mechanical hanging index plate and riding code to zero, close the balance door, cut off the power supply and cover the dust cover to keep the equipment tidy.
Regular maintenance
Check the measurement performance of the balance regularly, if you find problems such as zero point offset and abnormal index value, you need to stop using it and have it repaired by professionals.
The mechanical balance should be regularly checked whether the knife edge is sharp and whether the hanging code is worn, and the electronic balance needs to be calibrated regularly as required (internal calibration is carried out before each use, external calibration is carried out every 3~5 days, and recalibration is required after power off) to ensure measurement accuracy.
For balances that are not used for a long time, the lifting lugs, weighing plates, beams and other components should be removed and stored properly in a special packaging box to prevent damage or loss of parts.
summary
As a precision measuring instrument, the accurate use and proper maintenance of the balance are directly related to the reliability of the measurement results. From environmental control to pre-use preparation, from standardized operation to routine maintenance and regular maintenance, every link is indispensable.Only by strictly following the rules of use and doing a good job in environmental management, equipment inspection and maintenance can we extend the service life of the balance, ensure that it is always in good working condition, and provide accurate quality measurement data for scientific research, experiments, production and other fields. At the same time, the management method of establishing files by a dedicated person can also make the use and maintenance of the balance more systematic and traceable.
