- Weighing and Control Systems
- Force Sensors
- Foil Technology Products
weighing and control systems
The Weighing and Control Systems segment designs and manufactures complete systems comprised of load cells and instrumentation for weighing and force control/measurement for a variety of uses, include on-board weighing and overload monitoring systems. Typical applications for our Weighing and Control Systems products are process weighing of chemicals, food and pharmaceuticals; aircraft and truck weighing and overload protection; weight force and process optimization in steel and paper mills; and force measurement for offshore oil and gas exploration.
We manufacture high-performance solutions for weighing and batching in the process industry. Our systems perform with high accuracy over a wide temperature range — and despite vibration and other harsh conditions — whether they are used in quality reactor vessels, ingredient storage bins, clean-in-place batching processes, or anywhere else in the process industry. These systems control process weighing in food, chemical, and pharmaceutical plants. Learn More
Our products are the most reliable part of any mill stand. They have to be to perform without failure under the harshest of environments imaginable. Incorporating strain gages as sensing elements and constructed from solid, high strength stainless steel forgings, our products outperform and outlive competitive products when used as original equipment and as replacement in mills – which accounts for our high percentage of retrofit business in the steel industry. With our recent acquisition, we have added certain optical gages for control systems and enhanced our other product offerings for process control in the steel mill industry. Learn More
Web tension sensors and controllers are used on continuous processing machinery for applications such as paper and roofing material production, printing, metal rolling, cutting, embossing, punching and forming. Typically, force sensors are placed at each end of an idler roll that is part of a machine frame and over which the web travels in the process. Thereby, the idler roll equipped with sensors measures the force placed upon the roller from the web. The output signal from the sensor can be used to control such parameters as the magnitude of the web tension, the speed of the web, the alignment of the web, or to detect breakage in the processing of the web. Learn More
An onboard weighing system is used to weigh a load carried by a vehicle with the system being wholly contained within the vehicle. The system is used not only for measuring the weight of a load as it is being placed on a vehicle; it is also used to weigh portions of a load being removed from a vehicle. Typically this occurs where a vehicle is used to transport a load of material to various locations and at each location some of the load is removed. There are onboard weighing models available for tractor-trailers and vocational trucks in a variety of applications, including trash collection, dump trucks, and concrete mixers. The biggest benefits to truck operators are reduced loading and adjustment times, since onboard scales allow for loading the vehicle to the maximum legal limit on-site. In addition, they allow for maximized payloads on every trip and the elimination of overweight fines. Learn More
The Force Sensors segment includes a broad line of load cells and force measurement transducers that are offered as precision sensors for industrial and commercial use. Typical applications for force sensors are in medical devices (such as hospital beds and medication dosing), agricultural equipment (for precision force measurement), and construction machinery (for tipping and overload protection). These sensors use our foil technology products, which serve as sensing elements and components within each unit. Further integration of our load cells technology is also offered as part of our weighing module products, which provide customers with a complete sensor assembly that may be used within a wide variety of digital transducers.
Load cells are mechanical components which act as force sensors by employing strain gages to provide an electrical output proportional to the applied force. Typically the electrical output is either analog (voltage or current) or digital. Load cells have specific mechanical packaging and sensing orientation to fit into electronic scales, and testing and monitoring systems. Load cells can be used for tension, compression, and/or shear measurement. Tension load cells are used for measuring forces that are in-line and "pull apart". Compression load cells are used to measure forces that are in-line and "push together". Shear load cells are used to measure tension or compression forces that are offset (not in-line). When selecting load cells, there are many form factors or packages to choose from to insure their physical size is compatible with space available for the application, such as inside an electronic weighing scale. Learn More
Weigh modules are subassemblies designed to be mounted to tanks, trucks, bins, silos and other applications requiring an integrated weighing system. There are two basic types of weigh modules: compression and tension. Compression weigh modules are used to convert static loading applications such as tanks, or dynamic applications such as conveyors, into a scale. In tanks and other static structures, the weigh modules mount under the legs or supporting structure. Tension weigh modules convert a suspended tank or hopper into a scale. Mounting hardware ensures that only vertical load is measured, providing reliable weighing. Learn More
Weighing indicators and controllers are electronic instruments used for a range of applications from simple weight displays and data collection to control of an entire automated process including adding multiple ingredients to a batch recipe formulation, turning on a motor, or starting a conveyor. Weighing indicators and controllers are also used for inventory management and traceability. Typically controllers are supplied with programmable software. Learn More
VPG Transducers’ comprehensive R&D and Production facilities offer a full range of services to customers who require specialized weighing and force measurement solutions. With emphasis on high flexibility and adaptation to customer time-to-design, for sensors in any shape or capacity, we provide design support to each customer’s engineering team and tailor products to meet unique requirements. Our custom sensor solutions can be found in applications ranging from vehicle stability systems in construction equipment, to tractor load pins and sensors in agricultural equipment, to load cells and specialized force sensors for integrated weighing systems and medical equipment. Learn More
Our bonding service is aimed at strain gage users who do not have their own in-house bonding capabilities, or those who require extra capacity. Because we provide this service to many companies worldwide, we can offer fast response to sample requests, while also supplying large-scale projects.
Our use of Micro-Measurements (MM) strain gages and installation accessories ensures that the customer gets the best materials available, and fast turnover in our production ensures that we always use only the newest materials. Learn More
Foil Technology Products
The Foil Technology Products segment includes our foil resistor and strain gages operating segments. Typical applications for foil resistors include high end test equipment for the aviation, military and space, semiconductor, process control, oil and gas and medical markets. Typical applications for high strain gages are stress analysis for structural testing in the aviation, military and space, infrastructure and construction markets. The products in these segments are based on our resistive foil technology, which continues to evolve and enables both products to be suited for new and varied applications.
Strain gages are resistive sensors whose resistance is a function of applied strain (unit deformation). Stress is calculated from the strain information. Typically a strain gage is attached to a structure and when such a structure is deformed (tension, compression, shear), the resistive strands in the strain gage follow the structure deformation which causes an electrical resistance change. The resistance change is then expressed in units of strain or stress. Strain gages are used in transducers that convert force, pressure, tension, etc., into an electrical signal. They are also used for measuring strain in structures (stress analysis) such as airplanes, cars, machines, bridges and other structures. Performance specifications to consider when searching for strain gages include operating temperature, the state of the strain (including gradient, direction, magnitude, and time dependence), and the stability required by the application. Learn More
Resistors are electrical components that oppose the flow of current. They are used to protect, operate, or control circuits. In addition to being supplied as individual components of a single resistance value, resistors can also be supplied as pre-configured resistor networks with multiple resistors inside a common package. Voltages can be reduced with individual resistors or divided into separate voltages with the use of resistor networks. Performance specifications to consider when searching for resistors include resistance range, tolerance, power rating, continuous operating voltage, temperature coefficient, (TCR), Resistance change due to power (PCR), and operating temperature. Learn More
Data acquisition instrumentation is used to sample real world physical conditions and conversion of the resulting samples into digital numeric values that can be manipulated by a computer. The components of data acquisition systems include sensors that convert physical parameters to electrical signals, signal conditioning circuitry to convert analog waveforms into digital values for processing, and software programs using various general purpose programming languages. Learn More
Current sensing resistors convert the current flowing through them to a voltage drop. Monitoring or measuring this voltage drop allows the current through the resistor to be measured. Typical uses for current sensing resistors include electric motor control, surge protection circuits for electronic products, energy optimization in battery powered portable products, high precision weight measurements, control of X-Y displacement, and many other applications. Learn More
PhotoStress® is a popular and widely used technique for measuring surface strains to determine the stresses on a part or structure during static or dynamic testing. A special strain-sensitive plastic coating is first bonded to the test part. Then, as test or service loads are applied to the part, the coating is illuminated by polarized light from a reflection polariscope. When viewed through the polariscope, the coating displays the strains in a colorful, informative pattern which immediately reveals the overall strain distribution and pinpoints highly strain areas. With an optical transducer (compensator) attached to the polariscope, quantitative stress analysis can be quickly and easily performed. Learn More