Guangzhou Huayuan Scientific Instruments Co., Ltd.

How to calibrate an analytical balance

Author：Guangzhou Huayuan Scientific Instruments Co., Ltd. Click： Time：2025-10-22 20:36:22

1. Preparation Phase

Environmental Requirements: Ensure the balance is placed on a stable platform free from vibrations, drafts, and heat sources. Room temperature should be stable, and direct sunlight must be avoided.

Leveling: Rotate the leveling feet of the balance and observe the built-in spirit level to precisely adjust the bubble to the center of the circular ring. This is the foundation of all calibration procedures.

Warm-up: Power on the balance and allow it to warm up for at least 30 minutes (or follow the manufacturer's recommendations) to ensure the internal circuitry and sensors reach thermal equilibrium.

Cleaning: Use a soft brush or lint-free cloth lightly moistened with alcohol to gently clean the weighing pan and its surroundings, ensuring no dust or residues remain.

2. Perform Internal Calibration (Built-in Weight Calibration - if supported by the balance)

Press the “CAL” (Calibrate) key lightly.

The balance will automatically lock and activate the internal motor to load the built-in reference weight onto the sensor.

Wait a few seconds until the balance automatically completes the calibration and displays a “0.0000g” or “End” signal.

Note: This function requires periodic external calibration by a qualified service provider to ensure the accuracy of the built-in weight.

3. Perform External Calibration (Using an External Standard Weight - Core Step)

Press the “CAL” key. The balance display will typically prompt the required weight to be loaded (e.g., “100.0000g”).

Wear gloves and use anti-static tweezers to handle a metrologically certified Class E2 (or higher) standard weight.

Place the weight gently and steadily at the center of the weighing pan.

Close the draft shield and wait until the reading stabilizes (usually indicated by a stability symbol).

The balance will automatically record and complete the calibration for that point. Then, remove the weight as prompted.

For high-precision balances, this process may need to be performed at multiple points, such as zero, mid-range, and full capacity (e.g., 0g, 50g, 100g).

4. Post-Calibration Verification

After calibration, it is recommended to use another Class E2 (or equivalent) check weight (never use the weight just used for calibration) to perform a verification measurement.

The measurement result should fall within the balance’s Maximum Permissible Error (MPE) range to confirm the calibration’s effectiveness.

Record: Log the date, time, calibration results, weight identification number, and operator’s name in the 《Balance Use and Calibration Record Sheet》.

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How to calibrate an analytical balance

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