1. Features of the METTLER TOLEDO electronic balance
Compared with mechanical balances, electronic balances have unique advantages and characteristics, mainly in the following aspects:
(1) Unique structural design. The principle of automatic compensation of electromagnetic force is adopted. When the weighing pan is loaded, the electromagnetic force pushes the weighing pan back to the original position, and the accuracy of the balance is not lost due to long-term use. The balance also adopts movable doors on both sides and at the top, which is convenient for weighing and engaging in titration work, which is convenient for testing and analysis.
(2) Excellent display technology. The technology of microcomputer and LCD display is adopted to make the electronic balance display faster and consume less power, and it also eliminates the adverse effects such as eye fatigue and visual error caused by long-term operation of the operator.
(3) The function is rich and the degree of automation is high. The general electronic balance has an overload protection device, that is, there is a signal indication when overloaded; it has a simple self-calibration or external school function, and is convenient to use; it has an automatic fault detection system, and the balance performs automatic fault detection after the balance is turned on, and if there is a fault, it passes The display shows the fault code and instructs the maintenance personnel to perform the repair. In addition, the new generation balance sets the operating procedure. When the environment changes, the weighing conditions and the tasks are not changed, the balance operating procedure can be changed as needed.
(4) Strong anti-interference ability. Due to the multi-stage anti-vibration program, the electronic balance has low requirements on the use environment and strong adaptability. Even if the electronic balance is used in an unstable environment, the accuracy of the weighing result can be ensured by changing the appropriate procedure.
2. Correct use and maintenance of the electronic balance
2.1 Correct use of electronic balances
2.1.1 The environment in which the electronic balance is used
In order to use electronic balances well, there must be a suitable place and environment.
(l) Select a suitable weighing platform. Should be as low as possible to avoid oscillation when oscillating work; to be diamagnetic; to have anti-static protection; placed on the ground or fixed to the wall, but not both ways; if conditions permit, it is best to use the balance-specific workbench.
(2) Choose a suitable location. Avoid direct sunlight, away from heat, air conditioning and undetectable airflow; workbench should be placed in the corner of the room, away from the magnetic field, or choose the strongest and least vibrating place in the building.
(3) Choose a suitable working environment. Although the electronic balance is not very strict with the temperature and humidity of the working environment, it is better to control the temperature at 10 ° C to 30 ° C. Humidity is in the range of 50% - 70% RH.
2.1.2 METTLER TOLEDO electronic balance operation precautions
The electronic balance is a very precise weighing instrument. The correct use of the user not only directly affects the accuracy of the weighing result, but also directly affects the normal performance of the electronic balance.
(1) Select a suitable electronic balance. The choice of electronic balance is mainly based on the weighing and sensitivity of the balance should meet the requirements of weighing, the structure of the balance should adapt to the characteristics of the work. The principle of selection is: not only to ensure that the balance is not overloaded, but also to ensure that the weighing has reached the necessary relative accuracy, to prevent weighing with a balance that is not accurate enough, so as to avoid accuracy that does not meet the requirements; The balance of accuracy causes waste.
(2) Correct installation of electronic antennas. Choose a room that is dust-proof, shock-proof, moisture-proof, and prevents temperature fluctuations. As a balance room, the balance with high accuracy should also be used in a constant temperature room. Secondly, the balance should be placed on a firm and reliable workbench and placed in an appropriate position for easy operation. Before the balance is installed, check whether the components are complete and intact according to the balance list of the balance; carefully clean all parts of the balance. When installing, refer to the balance's instructions, properly assemble the balance, and adjust the level. After installation, check the installation of each part again, then check if the power supply voltage meets the requirements of the balance, and then plug in the power plug.
(3) Preheating. Before starting to use the electronic balance, it is required to pre-heat up for half an hour to one hour. If you want to use it multiple times a day, it is best to let the balance open all day. In this way, the electronic balance can have a constant operating temperature inside, which is conducive to the accuracy of the weighing process.
(4) Calibration. Electronic balances should be calibrated regularly from the first use. If used continuously, it is calibrated approximately once a week. Standard weights must be used for calibration, and some balances contain standard weights that can be used to calibrate the balance. Before calibration, the electronic balance must be warmed up for more than 1 hour and checked for level. Calibration should be carried out in accordance with the prescribed procedures, otherwise it will not function as a calibration.
(5) Correct operation. When the electronic balance is weighed, the control keys and function keys should be used correctly; select the best integration time, and correctly grasp the reading and printing time to get the best weighing result. When weighing continuously with the tare key, you should pay attention to the balance overload. The balance door should be closed during the weighing process. After the electronic balance is used, the balance and door cover should be closed, the power supply should be cut off, and the dust cover should be covered.
2.2 Maintenance of the METTLER TOLEDO electronic balance
The correct maintenance and maintenance of the electronic balance has a great effect on the correct life of the balance and the correctness of the weighing result. Common maintenance items are as follows:
(1) The electronic balance shall be kept and maintained by a special person, and a technical portfolio shall be set up to store the instruction manual, the verification certificate, the test record, and record the maintenance and overhaul regularly.
(2) The electronic balance indoors should be kept clean, tidy and dry. Do not wash, eat, smoke, etc. indoors to prevent dust or other debris from entering the electronic balance housing.
(3) Do not open the cover at will to avoid the de-soldering and short-circuit of the electronic circuit, thus affecting the work of the electronic balance and even damaging the components. The load on the weighing pan shall not exceed the rated limit to avoid overloading the balance pressure sensor.
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