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medical, University

PS309 Used to Test CPAP Mask

Sleep apnea is common sleep disorder in which breathing repeatedly stops and starts. This is most commonly caused by the relaxing of throat muscles or, more rarely, when the brain fails to send the right signals to the muscles that control breathing. This can be a serious condition leading to increased risk of strokes, high… Read More

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Aerospace, Military

Pressure Measurements in Skydrol Hydraulic Systems

Skydrol is a phosphate ester hydraulic fluid used in aircraft.  Hydraulic systems in aircraft are most often used to position control surfaces and actuate the landing gear.  Broken hydraulic lines in and around hot engine parts were causing fires in the early years of air travel, so in the 1940s Douglas Aircraft  and Monsanto jointly… Read More

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Aerospace, Automotive, Flight Testing, Military, Oil & Gas

Fluid Isolation in Pressure Transducers for Corrosion Protection

When the chemicals present in a fluid are very aggressive, and the pressure transducer is not available in materials sufficiently resistant to corrosion, it is often possible to mitigate these conditions with a fluid isolation system. This system can be created from easily available parts and help to achieve a useful service life where rapid… Read More

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medical

Anesthesia Delivery Systems

One method of administering anesthesia to surgical patients on the operating table is via a vapor delivery system. In this method the anesthesia is poured into a vaporizer as a liquid and medical grade oxygen piped to the vaporizer as well. A heater turns the liquid anesthesia to a vapor so that it can be… Read More

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Aerospace, Automotive, Military, Oil & Gas, University, Utility

Tips on Storing Validyne Pressure Sensor Diaphragms

The diaphragm or sensor membrane is the heart of a Validyne pressure sensor. To increase the lifespan of replacement diaphragms follow these best practices to store and maintain your units. Diaphragm discoloration may occur overtime due to the relative humidity while in storage. The discoloration does not have any negative effect on the diaphragms performance… Read More

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Oil & Gas, Utility

New pressure sensor material – Hastelloy

Validyne Engineering now offers an optional pressure sensor body construction in Hastelloy C276.  This greatly improves the corrosion resistance of pressure transducers used in applications where highly oxidizing chemicals are present in the process media.  Along with a teflon-coated sensing diaphragm and wide selection of O-ring materials, the Hastelloy C276 transducer is the most corrosion-resistant… Read More

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Aerospace, Military

Testing Blade Flex

Helicopters are a common sight in the sky and are used for many important tasks.  Rotors are used to provide lift and the large blades on these rotor assemblies often rotate at a rate of 300 RPM or higher, depending on the helicopter type.  The rotor blades must be strong, yet flexible – the attack… Read More

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Precision Viscometry

Precision Viscometry Using Hydraulic Bridge

  If you are making complex molecules, how do you know your process is on target? Many petrochemical products contain long polymer chains that can change character quickly with only small deviations in the manufacturing process. Modern pharmaceuticals now include complex proteins and other molecules that are difficult to characterize by conventional methods. How can… Read More

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Automotive, Military, Pressure Measurement

Engine Air Filter Pressure Drop

Diesel and gasoline engines require a lot of air as part of the internal combustion process.  Anyone who has lifted the hood on their automobile knows that the air coming into a vehicle engine is filtered to keep out road dust and grit from entering the engine cylinders.  All vehicles have an air filter for… Read More

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Oil & Gas, Pressure Measurement, Utility

Pressure Transmitter to Detect Burner Flame Instability

Large-scale industrial installations such as refineries and chemical plants often have large heaters that are used in the processing of fluids and gases.  Such heaters must now be designed to minimize NOX emissions to meet Federal clean air requirements and much research has gone into finding ways to make the burning process more efficient. The… Read More