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Force Calibration Service

Proving Ring Calibration

Analog dial gauge & digital LVDT proving rings. IS 1828 & ASTM E74 compliant. CTMs, CBR machines & geotechnical labs.

Overview

Proving Ring Calibration

Proving rings are critical reference instruments used in concrete compression testing machines (CTMs), CBR testing equipment, and geotechnical laboratories. SRUNIQ calibrates both analog dial gauge and digital LVDT proving rings across all standard capacities, compliant with IS 1828 and ASTM E74, using dead weight force machines for maximum accuracy.

IS 1828
Indian Standard Compliant
NABL
Traceable Certificates
ASTM E74
International Compliance
✓ IS 1828
✓ ASTM E74
✓ ISO 376:2011
✓ NABL 129
Request Calibration Customer Portal
Proving Ring Calibration
Instrument Types

What We Calibrate

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Analog Dial Gauge Rings

Traditional proving rings with mechanical dial gauge readout for CTMs and geotechnical labs using older protocols.

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Digital LVDT Proving Rings

Modern linear variable differential transformer rings offering higher resolution and digital output.

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CTM Proving Rings

Calibration of proving rings used in concrete compression testing machines for civil construction QC.

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CBR Test Proving Rings

California Bearing Ratio proving rings for soil and subgrade testing in road and foundation engineering.

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Geotechnical Proving Rings

Triaxial, consolidation, and shear strength test rings for soil mechanics laboratories and research.

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Custom Capacity Rings

Non-standard capacity proving rings calibrated with tailored IS and international standard procedures.

FAQ

Frequently Asked Questions

Why do proving rings need regular calibration?
Proving rings experience fatigue and deflection changes over time with frequent CTM use. Regular calibration ensures the ring constant remains accurate — essential for valid compressive strength test results.
Can you calibrate proving rings from any manufacturer?
Yes. SRUNIQ calibrates proving rings regardless of manufacturer. We only require the instrument's rated capacity and applicable standard.
How do I receive my certificate?
Certificates are uploaded to the customer portal within 24–48 hours of completion. Log in at cert.sruniq.com to view and download.

Ready to Get Your Instrument Calibrated?

NABL-traceable certificates. 70% faster than industry average. Expert team. Contact SRUNIQ today.

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