Accurate torque measurement can be a matter of life or death. A wrongly tightened fastener or an actuator that can't deliver the torque needed can cause cascading failures and catastrophic breakdown. Torque measurement protects against these risks, but only if performed with sufficient accuracy. When standard torquemeters don't deliver the performance-needed precision, it's time for an ultra-precise torque transducer.
When you buy an ultra-precise torquemeter from S. Himmelstein and Company, you're getting an instrument on which you can rely. NIST-traceable calibration in both CW and CCW directions, coupled with precise temperature compensation and rigorous shunt calibration, ensure exceptional accuracy and reliability.
Building an Accurate Torque Transducer
Rotary torque is measured by embedding four strain gages in a shaft. At rest, two will be in compression and two in tension. Strain gages respond to changing torque with subtle shifts in resistance. When in a Wheatstone bridge arrangement, sophisticated signal-conditioning electronics convert these resistance changes to torque values.
Strain gage performance depends on excitation voltage and is affected by temperature. Shunt calibration ensures that resistance changes correspond to known torque values while a signal conditioner delivers high-stability excitation. Applying precisely controlled temperature compensation removes the effect of hot environments and motor-generated heat. Last, hardening against EMI protects against interference from adjustable speed drives.
No Peak Clipping
When a torquemeter is used for testing and measurement, values can change quickly and swing widely. If the transducer can't handle these fluctuations, there's a risk of peak clipping, which leads to measurement inaccuracy. An ultra-precise torque sensor from S. Himmelstein and Company won't have this problem because ours incorporate the highest-overrange capability of any torque measurement instrument.
Exceptional Design, Construction and Performance
No corners were cut when we set out to engineer our most-accurate digital torque transducer family. The 48800V, 49800V, 59800V and dual-range 79800V ultra-precise torque transducers incorporate all the features you'd expect in a precision measurement instrument.
Temperature compensation over a range of 75-175°F delivers 0.0006% performance. EMI hardening and sophisticated signal-conditioning electronics ensure stability in readings. Rigorous — and NIST-traceable — shunt and CW and CCW calibration keep combined nonlinearity and hysteresis below 0.02% and 48-hour drift is below 0.02%.
The result of all this attention to detail? The standard-grade Code N ultra-precise torque sensor achieves a combined error of less than 0.04% of full scale. At under 0.02% combined error, the enhanced Code C grade performs to an even higher standard.
Additional Features of Our Ultra-Precise Torquemeters
The keyed shaft simplifies in-line installation. Digital and analog torque-value outputs are provided, with speed and power optionally available in Code Z grade. Link to a PC or other data-acquisition device through RS232 or RS422/485. Models are available with up to 1,000% overload capacity and handling up to 375,000 lbf-in.
Torque Measurement Specialists
Precision is essential when measuring torque to verify equipment performance and only the most-accurate digital torque transducer is suitable for safety-critical laboratory or bench testing.
S. Himmelstein and Company has six decades of torque measurement experience. At our facility in Hoffman Estates, Illinois we build carefully engineered instruments and calibrate them in our ISO 17025-accredited laboratory. Once they’re in the field, we continue to stand behind our products, delivering exceptional after-sales and calibration services.
We believe our torque measurement instruments provide an unmatched combination of price and performance, but don't take our word for it. Contact us with questions and we'll be happy to discuss what makes our transducers special.