Quick Answer
Torque transducer calibration applies known reference torques using NABL-calibrated dead-weight torque standard (moment arm + calibrated weights) or reference torque transducer in series. Calibration covers 5 points from 0–100% rated torque in clockwise and counterclockwise directions per ISO 6789-2 and VDI/VDE 2645.
Key Takeaways
- Torque transducer calibration uses dead-weight moment arm or reference torque calibration machine.
- Calibration covers: sensitivity (mV/V), non-linearity, hysteresis, zero balance, and temperature coefficient.
- Rotary (dynamic) torque transducers require a spin-test calibration at rated speed in addition to static calibration.
- Prism calibrates static and rotary torque transducers from 0.1 N·m to 100 kN·m.
- Used in engine test cells, gearbox test rigs, motor test benches, and pump test facilities in Gujarat.
Applications of Torque Transducers in Gujarat
- Engine test cells (IC engines, electric motors, turbines)
- Gearbox and transmission test rigs (automotive, wind turbine)
- Pump and compressor efficiency testing (BPCL, GSFC, chemical plants)
- Tightening systems and servo press torque control
- Bearing friction torque measurement (precision bearings, SEW, SKF)
- Windmill nacelle and blade torque measurement
Static vs Rotary Torque Transducer Calibration
Static Torque Transducer
Measures torque in a stationary (non-rotating) configuration. Calibrated by applying known torque using moment arm and weights. Simpler and higher accuracy.
Rotary (Dynamic) Torque Transducer
Measures torque in a rotating shaft. Requires spin calibration at rated speed in addition to static calibration. Used in engine test cells and power measurement.
Frequently Asked Questions
How is torque transducer calibration different from torque wrench calibration?
Torque wrench calibration (ISO 6789-2) tests a hand-operated tool at specific set torque values. Torque transducer calibration characterises a sensing element's output across its full range for use in a test rig or measurement system. Both use similar deadweight or reference transducer methods.
Can Prism calibrate high-capacity torque transducers above 10 kN·m?
Yes. Prism calibrates torque transducers up to 100 kN·m using precision loading arms and NABL-calibrated reference masses, or comparison with a reference class torque transducer.
How often should torque transducers be calibrated?
Annual calibration is standard. High-cycle transducers in production test rigs (millions of cycles per year) should be calibrated every 6 months.
Does Prism calibrate engine test cell torque measurement systems?
Yes. Prism provides system calibration for complete engine dynamometer torque measurement chains including transducer, signal conditioner, and display/DAQ system.
What is the NABL uncertainty for torque transducer calibration?
Prism achieves expanded uncertainty of ±0.1% of rated output (k=2) for static torque transducers and ±0.3% for rotary (dynamic) torque transducers, well within the ISO 376 Class 0.5 requirement.
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