Legal Certification

Testing & Calibration of Weighbridge with Legal Metrology Approval

1. Pre-Inspection & System Readiness

• Physical inspection of weighbridge platform, foundation, and approach roads.
• Checking platform leveling, free movement, and mechanical clearances.
• Inspection of load cells, mounting assemblies, check rods, and stoppers.
• Cleaning of pit / platform area to remove debris affecting accuracy.

---

2. Electrical & Electronic Verification

• Inspection of load cell cables, junction boxes, connectors, and glands.
• Verification of earthing, grounding, and power supply stability.
• Functional check of weighing indicator, display, printer, and peripherals.
• Ensuring sealing arrangements are intact and tamper-proof as per Legal Metrology norms.

---

3. Zero & Stability Testing

• Zero setting with unloaded platform.
• Observation of zero stability over specified time duration.
• Adjustment of zero if required, strictly as per manufacturer and Legal Metrology guidelines.

---

4. Accuracy & Calibration Tests

Calibration shall be carried out using certified standard test weights or approved test methods in the presence of Legal Metrology authorities.

• Corner (Eccentric Load) Test
  

  • Placement of test weights at all corners.
  • Verification of uniform response and correction of imbalance.

• Span / Linearity Test
  

  • Incremental loading at multiple points (e.g., 25%, 50%, 75%, 100% of capacity).
  • Verification of permissible error limits as per Legal Metrology Rules.

• Repeatability Test
  

  • Repeated loading and unloading of same test weight.
  • Confirmation of consistent readings within allowable tolerance.

---

5. Calibration Adjustment & Sealing

• Adjustment of calibration parameters (zero, span, linearity) where required.
• Locking of calibration settings after completion.
• Sealing of indicator, junction box, and other required points as per Legal Metrology procedure.

---

6. Legal Metrology Inspection & Approval

• Full cooperation and technical assistance during inspection by Legal Metrology Department.
• Demonstration of weighbridge performance as per statutory test procedures.
• Compliance verification with applicable Legal Metrology Act & Rules.
• Obtaining Legal Metrology Stamping / Approval Certificate upon successful verification.

---

7. Documentation & Records

• Preparation and submission of calibration and testing report.
• Recording of test results, seal numbers, and inspection observations.
• Display of valid stamping sticker / seal on weighbridge as required.

---

8. Exclusions (Unless Specifically Included)

Civil modifications, structural repairs, or major component replacement unless covered under contract.

Government stamping fees, penalties, or statutory charges