Weight Indicator Calibration and Maintenance Guide
Regular calibration and maintenance of weight indicators ensure accurate weight measurements for process control, quality assurance, and trade applications.
I. Calibration Methods
Physical Calibration (Test Weights)
- Clean the scale platform and remove any debris
- Perform zero calibration with the platform empty
- Place certified test weights on the scale centered on the platform
- Enter the known test weight value into the indicator
- Complete the calibration sequence per manufacturer instructions
- Verify calibration by placing additional known weights and confirming readings at multiple points
Electronic Calibration (eCal)
- Used when physical test weights are impractical (for large capacity scales)
- Enter the load cell sensitivity and capacity values
- The indicator calculates the theoretical output and sets calibration accordingly
- Always verify with available test weights after electronic calibration
II. Maintenance Schedule
- Daily: Visual inspection of display, cables, and connections
- Weekly: Check zero balance and verify basic weighing function
- Monthly: Clean indicator and junction box. Check and tighten all connections.
- Quarterly: Corner load test and linearity check with test weights
- Annually: Full calibration, inspection of all cables and load cells, certification for trade applications
III. Regulatory Compliance
- For trade applications, follow local weights and measures regulations for calibration and certification intervals
- Maintain calibration certificates and inspection records
- Apply calibration seals where required to prevent unauthorized adjustments
- Ensure the indicator has the required legal-for-trade certification
