Electronic balances generally use electromagnetic balance sensors. It weighs fast, stable and accurate. The electronic balance also has functions such as automatic calibration, one-button return to zero, one-button tare, and fault indication. These are not available in traditional pallet balances.
The electronic balance is weighed using the principle of electromagnetic force balance. When measuring an object, the principle of balancing the electromagnetic force with the gravity of the measured object is used to achieve the measurement. When the weighing pan is on the machine or the weighed object is removed, the balance will produce an unbalanced state. At this time, the displacement of the coil in the magnetic steel can be detected by the displacement detector, and the current is displayed digitally by the automatic compensation circuit of electromagnetic force Out the weight of the object.
Types of electronic balances
According to the measurement range, it can be divided into:
- Ultra-micro electronic balance: the maximum weighing is 2-5 grams
- Microbalance: Weighing is generally between 3-50 grams
- Semi-micro balance: Weighing is generally 20-100 grams
- Constant electronic balance: the maximum weighing is generally 100-200 grams
- Analytical balance: Electronic analytical balance is the general name of the above balances.
Structure of the balance (pictured)
- Weighing pan: The weighing pan is mounted on the sensor and is generally round or square, and is mostly made of metal materials.
- Sensor: One of the key components is composed of housing, magnetic steel, pole shoe, and coil. Under the weighing pan. Its accuracy is very high and very sensitive. The balance should be kept clean, and the sample should not be spilled to prevent the sensor from working properly.
- Position detector: Its role is to convert the load on the weighing pan into an electrical signal output.
- PID regulator: Ensure fast and stable sensor operation.
- Power amplifier: Its role is to amplify weak signals.
- Digital to Analog Converter: High conversion accuracy, easy to automatically zero, and effectively eliminate interference.
- Feet: Adjust the level by adjusting them.
Electronic balance main performance index
- Stability: It is the ability of the balance to automatically return to its initial equilibrium position after receiving interference. Once interference is applied to the balance, although the value has changed, after the interference is eliminated, the original value can be restored, which indicates that the balance is stable.
- Sensitivity: Sensitivity refers to how quickly the balance reads. The smaller the mass change that the balance can detect, the more sensitive it is.
- Correctness: That is, the accuracy of the reading.
How to operate the balance
- Level adjustment: Before turning on the balance, you should observe whether the blisters in the spirit level are in the center of the ring. The horizontal bubble can be adjusted by the bolts on the feet.
- Warm up: After powering on, a minimum warm-up time of 30 minutes is required. Therefore, do not cut off the power frequently.
- Weighing: Press ON to turn on the display.
- Wait for instrument self-test: According to the display, the self-test is completed before weighing.
- Place the weighing paper and press the Tare key. The display shows zero and put in the weighing object.
- When weighing is finished, turn off the display.
Notes on using the balance
- Each balance has a fixed weight. Do not use other balance weights. Keep the weight dry. The weight must be grasped with tweezers and put back in the weight box when it is used up.
- When weighing volatile or corrosive items, be careful not to spill them on the weighing pan.
- The same experiment should use the same balance for weighing.
- The balance must be placed on a stable workbench.
- Before use, adjust the level bubble to the middle position.
- Warm up before use.
- Regular calibration
- Do not overload