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Industrial Analytical Instrumentation

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Precision sensors, systems and instrumentation

Micro-Measurements' bondable resistors for
transducers now built on advanced sensors technology

To meet the growing demand for precise and reliable compensation resistors used in building transducers such as load cells, Micro-Measurements®, a Vishay Precision Group, Inc. (VPG) brand, recently announced that its bondable resistors for transducers are now being built on Advanced Sensors Technology and feature high-purity nickel. The LT02 and LT10 series of fixed-value nickel resistors offer tight resistance tolerance and repeatable performance for use in transducer bridge completion circuits.

"A transducer is the generic name given to devices that convert an input stimulus into a measurable signal," said Ron Zukerman, Micro-Measurements Advanced Sensors manager of marketing and sales. "Precision weighing or force transducers based on strain gage sensors convert the mechanical input of an object, typically the object's mass or the reaction force caused by a weight applied to the transducer, into a measurable resistance change."

As the foundation of consistently reliable and precise transducers, Micro-Measurements' Advanced Sensors bondable nickel resistors are built on a new manufacturing process using state-of-the-art equipment and tooling. This results in a tighter tolerance, better stability, and shorter lead times when compared to conventional manufacturing techniques. Customers who have tested the resistors in transducer products have reported more repeatable test data when compared with previous-generation conventional resistor types.

For the highest accuracy, precision strain-gage-based transducers require compensation for several undesirable influences, most notably the influence of temperature change. These compensations are typically effected using precision resistors of various values and temperature sensitivities. Micro-Measurements offers a complete line of bondable precision resistors for use as transducer compensation elements, including fixed-value and adjustable resistors manufactured using either high- or low-TCR materials.

Micro-Measurements fixed-value resistors, such as the LT02 and LT10 patterns, are typically used for adjusting the full-scale span output with temperature changes, and they are therefore normally produced in high-TCR resistive alloys such as Balco or nickel. Adjustable resistors such as Micro-Measurements' D01 pattern are ideal for adjusting the room temperature span of a transducer, while dual-sided E01 and H21 patterns can be used to set the initial zero reading. The devices are manufactured using low-TCR alloys such as copper-nickel and nickel-chrome. Dual-sided E01 and H22 patterns are used for compensating the zero reading of the transducer with temperature. Because active temperature compensation is required, these patterns feature high-TCR alloys such as Balco and copper.

Although they are less convenient, but equally effective, low-TCR alloys are also available in small-gage wire, which is cut to the required length and soldered into the transducer Wheatstone bridge circuit with the strain gages.

Vishay Precision Group, Inc. (NYSE: VPG) in profile
VPG is an internationally recognized designer, manufacturer and marketer of: components based on its resistive foil technology; sensors; and sensor-based systems specializing in the growing markets of stress, force, weight, pressure, and current measurements. VPG is a market leader of foil technology products, providing ongoing technology innovations in precision foil resistors and foil strain gages, which are the foundation of the company's force sensors products and its weighing and control systems. The product portfolio consists of a variety of well-established brand names recognized for precision and quality in the marketplace.

For further information, view website: www.vpgsensors.com

Micro-Measurements in profile
Micro-Measurements, a Vishay Precision Group, Inc. (VPG) brand, is dedicated to the development, manufacture, and marketing of resistive-foil sensors for high-precision strain measurement. Micro-Measurements offers a full complement of strain gages, PhotoStress® equipment and coatings, data acquisition systems, and supplies necessary to obtain accurate, reliable stress data. Our products are used throughout the industrialized world -- both in the practice of stress measurements analysis and as the sensing elements in a wide variety of transducers for measuring physical variables (weight, force, torque, pressure, etc.).

For further information, view website: www.micro-measurements.com Follow Micro-Measurements at: www.strainblog.com or twitter.com/strain_gage

Micro-Measurement and PhotoStress are registered trademarks of VPG.

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