MALVERN, Pa.--(BUSINESS WIRE)--
Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay
Foil Resistors brand (VFR) Bulk Metal® Foil commercial
off-the-shelf (COTS) resistors are increasingly in demand to meet the
needs for high reliability and long-term stability in control and
monitoring applications. Including the surface-mount VSMP Series
(0603-2512), hermetically sealed oil-filled VHP100, and leaded Z Series,
VFR’s comprehensive portfolio offers a variety of resistor
configurations, case sizes, and ultra-high-precision specifications for
optimized performance. All are based on proven foil resistor
technologies with a 50-year track record of delivering ultra-precision
performance while continuing to evolve and improve to serve the needs of
the market.
“Many monitoring and control applications utilize a 4 mA to 20 mA
closed-loop circuit, consisting of a DC power supply to power the loop,
a sensor/transducer/transmitter that inserts the sensor-related current,
and a meter or control device at the other end of the loop. Generally,
analog sensors with just microvolt-level outputs continuously detect
changes in any significant stage in the process,” said Yuval Hernik,
senior director of application engineering for VFR.
“The sense resistors used in these circuits, typically 250 Ω, are
critical for system operation and must offer high stability and
reliability. Since voltage across the resistor is fed directly to the
meter, any error could indicate that the sensor is reading a
non-existent condition. The process control correction made on this
reading would then cause the system to operate at less than optimal
conditions and reduce its efficiency, which could result in increased
operating costs, environmental pollution, hazardous spills, associated
fines, and poor product quality. Prudent designers consider all of the
possible problems that could affect the performance and reliability of
their monitoring and control circuits, and select the sense resistor
that best protects the performance of their equipment. And with the
menaces of early obsolescence and counterfeiting ever more evident in
the electronics industry, buyers are more closely than ever scrutinizing
not just devices but their manufacturers as well to avoid problems down
the road.”
VFR’s Bulk Metal Foil resistors for control and monitoring applications
provide the high reliability and long-term stability required for 4 mA
to 20 mA circuits. The surface-mount VSMP Series and through-hole Z
Series devices offer ultra-low TCR of ±0.05 ppm/°C typical (0°C to
+60°C) and ±0.2 ppm/°C typical (-55°C to +125°C, +25°C ref.), while the
secondary standard VHP100 resistor offers an essentially zero TCR and is
available with tight tolerances down to ±0.005% (50 ppm). The devices
feature exceptional load-life stability of ±0.005% at 70°C for 2,000
hours at rated power and ±0.01% at 70°C for 10,000 hours. The resistors
are virtually immune to extraordinary incidents such as radiation
exposure and withstand ESD spikes to at least 25 kV.
Featuring a non-inductive (<0.08 μH), non-capacitive design, Bulk Metal
Foil devices offer a rise time of 1.0 ns, with effectively no ringing, a
thermal stabilization time of <1 s (nominal value achieved within 10 ppm
of steady state value), current noise below 0.010 µVrms per volt of
applied voltage (<-40 dB), voltage coefficient of <0.1 ppm/V, and
thermal EMF of 0.05 μV/°C typical. The devices provide wide resistance
ranges, with any resistance value within their given range available at
any tolerance with no additional cost or lead-time effect.
An often overlooked reliability concern in 4 mA to 20 mA DC current
loops is moisture, which can open thin film resistors in just a few
hours of operation or cause a more gradual increase in resistance over a
longer period of time. In addition to the thicker resistance grid of
Bulk Metal Foil resistors, devices such as the VHP100 feature a
hermetically sealed metal and glass enclosure to protect the resistive
element against humidity, and are oil filled to improve the thermal
dissipation path to the outside. In industrial control and monitoring
applications, environmental pollution is also a constant concern,
including high concentrations of sulfur vapor, which can penetrate
conformal coatings and cause damage to resistors. Surface-mount Bulk
Metal Foil chip resistors like the VSMP Series feature a special coating
and construction that is reliable in these extreme environments.
Samples and production quantities of the foil resistors are available
now, with lead times of five days for prototype samples and from two
days to five weeks for standard orders at the catalog houses, depending
on their shelf availability.
Further information about Vishay Foil Resistors products is available at www.vishayfoilresistors.com.
Follow Vishay Foil Resistors at http://twitter.com/foilresistor.
About Vishay Precision Group
Vishay Precision Group (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. To learn more,
visit VPG at www.vishaypg.com.
About VPG Foil Resistors
VPG Foil Resistors, a part of Vishay Precision Group (VPG), produces the
most precise and stable resistors available. Distinguished by the
premier brands Vishay Foil Resistors, Powertron, and Alpha Electronics,
the VPG Foil Resistors portfolio includes discrete resistors and
resistor networks in surface mount and through-hole (fixed-lead)
configurations; customized chip resistor networks; precision trimming
potentiometers; and discrete chips for use in hybrid circuits. These
devices are used in applications requiring a high degree of precision
and stability, such as in medical testing equipment, semiconductor
equipment, precision measuring instruments, aerospace, and military
applications. To learn more, visit www.vishayfoilresistors.com.
Bulk Metal is a registered trademark of Vishay Precision Group, Inc.
Link to detailed application info:
http://www.vishaypg.com/docs/49676/aaag106.pdf
Link to application photo:
http://www.flickr.com/photos/[email protected]/8726322851
Vishay Precision Group
Marti Spalding, +1 919-374-5515
Director,
Global MarCom
[email protected]
Source: Vishay Precision Group, Inc.