Quick Answer
Prism Calibration Centre (NABL CC-2480) calibrates crane scales, hook scales, and shackle dynamometers from 1 kg to 50,000 kg capacity in Ahmedabad. Calibration uses NABL-certified reference masses (F1/F2 class weights) with traceable certificate per OIML R 76 and ISO 8398.
Key Takeaways
- Crane scale calibration range at Prism: 1 kg to 50,000 kg (50 tonnes).
- Reference standard: OIML Class F1/F2 calibrated masses; deadweight method for large capacity.
- Calibration per OIML R 76, IS 1435, and manufacturer specifications.
- NABL certificate required for statutory weighment, customs, and legal-for-trade applications.
- On-site calibration available at steel mills, port facilities, and fabrication yards in Gujarat.
Types of Overhead Weighing Instruments Calibrated
- Wireless crane scales (load cell type, remote display)
- Shackle dynamometers (U-type, D-shackle)
- Hook scales / hanging scales (mechanical dial type)
- Bale scales (jute, cotton, textile)
- Force gauges and tension meters (cable tension measurement)
- Bi-directional load cells for structural monitoring
Crane Scale Calibration Method
Crane scale calibration uses the deadweight comparison method. NABL-calibrated reference masses are applied to the crane scale in increments from zero to maximum capacity. The scale reading is compared with the applied mass at each point. For large-capacity crane scales (>5 tonnes), certified vehicle weights or precision reference load cells are used as references. The calibration is performed with the scale suspended from its normal hook attachment point.
Legal-for-Trade Crane Scale Requirements
Weights & Measures Act
Crane scales used for commercial transactions (buying/selling goods by weight) must be verified by the Weights & Measures Inspector AND calibrated by NABL-accredited labs for maximum accuracy assurance. Prism provides NABL calibration which complements the statutory verification.
Frequently Asked Questions
Can Prism calibrate crane scales on-site at our steel mill?
Yes. Prism offers on-site crane scale calibration at steel mills, fabrication yards, and port facilities. We carry certified reference masses and calibration equipment to your facility.
What is the largest crane scale Prism can calibrate?
Prism calibrates crane scales up to 50,000 kg (50 tonnes) capacity. For larger crane scales (above 50 tonnes), Prism coordinates with specialised high-capacity calibration facilities.
Is NABL crane scale calibration required for export cargo weighment?
Yes. Export cargo weighment using crane scales is subject to customs verification, and NABL-calibrated scales are accepted as evidence of accurate weighment for customs purposes.
How often should crane scales be calibrated?
Annual NABL calibration is standard. Crane scales used for legal-for-trade commercial weighment are also subject to annual verification by State Weights & Measures authorities.
Does Prism calibrate cable tension dynamometers for overhead crane inspections?
Yes. Prism calibrates cable tension dynamometers (shackle dynamometers) used in overhead crane statutory inspections and wire rope tension testing.
Written by
Er. Parthiv Kinariwala
Managing Director · Prism Calibration Centre · NABL CC-2480 · Ahmedabad
Er. Parthiv Kinariwala founded Prism Calibration Centre in 2004 and has over 20 years of hands-on experience in calibration engineering, NABL accreditation, and industrial compliance. His team performs 10,000+ calibrations annually from the Vatva GIDC laboratory, serving 5000+ industries across Gujarat.
Prism Calibration Centre — Vatva GIDC, Ahmedabad
Prism Calibration Centre
F-101, Rudraksh Complex 2, Phase 3, GIDC Vatva, Near Jasoda Nagar Cross Road, Ahmedabad — 382445, Gujarat, India
Phone: +91 98245 26444
Email: info@prismcalibration.com
NABL: CC-2480 · ISO/IEC 17025:2017
Hours: Mon–Sat, 9:00 AM – 7:00 PM