Preparations Before Adjustment
Environmental Check: Ensure the weighbridge installation location is level, free from strong electromagnetic interference, and free from vibration sources (such as heavy machinery). If used in harsh environments (such as humid or high-temperature conditions), confirm in advance that the equipment's protection level meets standards.
Equipment Check: Check that the sensors, junction boxes, display instruments, and other components are intact, and that the connecting wires are not loose or damaged. For electronic weighbridges, pay special attention to checking the stability of the power supply voltage (usually 220V).
Tool Preparation: Prepare standard weights (recommended to cover 20%-100% of the weighing range), a multimeter, a level, wrenches, and other tools.
Detailed Adjustment Steps
1. Basic Adjustment: Sensor and Weighing Platform Calibration
Step 1: Use a level to adjust the height of the four corners of the weighing platform, ensuring a horizontal error ≤2mm. If the weighing platform size is customizable, adjust the support points according to the actual dimensions.
Step 2: Connect the sensor to the junction box. Use a multimeter to check the sensor resistance (usually 350Ω ± 1Ω) to confirm there is no short circuit or open circuit.
Step 3: Under no-load conditions, observe whether the display instrument returns to zero. If there is a deviation, access the "Zero Point Calibration" function through the instrument menu and follow the prompts to complete the operation.
2. Range and Scale Division Settings
Step 1: Set the instrument parameters according to the weighbridge specifications (e.g., 3t range, 1kg scale division). Enter the "Range Setting" menu and input the maximum weighing value (3000kg) and scale division value (1kg).
Step 2: Perform linear calibration. Place standard weights sequentially (e.g., 1t, 2t, 3t), record the instrument display value. If the error exceeds the quantitative error (0.3%), adjust using the instrument's "Linear Correction" function.
3. Angle Error Correction and Off-center Load Test
Step 1: Divide the weighbridge into four quadrants. Place a weight (e.g., 1 t) at the center of each quadrant and record the displayed value.
Step 2: If the difference in displayed values between quadrants exceeds the graduation value (1 kg), adjust the sensor output signal using the instrument's "Angle Error Correction" function to ensure the off-center load error is ≤0.5 graduation value.
4. Dynamic Test and Vehicle Speed Limit
Step 1: Simulate a vehicle weighing scenario. Slowly drive to the center of the weighbridge at a speed ≤5 km/h and observe whether the displayed value is stable.
Step 2: If excessive vehicle speed causes data fluctuations during weighing, set the "Vehicle Speed Limit" parameter in the instrument (supported by some models), or train operators to standardize the weighing procedure.
