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Pressure Measurement

Measuring the Vertical Hydraulic Gradient in River Beds

Where does the water in a river come from?  The obvious answer is that it comes from upstream, the sum of the waters added by many tributaries.  This is certainly correct – and the largest factor in river flow.  But this is not the only source of water in a river.  Depending on geography and… Read More

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Aerospace, Flight Testing, Oil & Gas, Pressure Measurement, Utility

Tank Level Measurement

Introduction: Measuring the fluid level in tanks is a common requirement for almost every industrial process.  The automatic control of fluids depends on knowing how much liquid is stored in a tank at any given time.  This is used to monitor inventory and control pumps.  This application describes how to use high line differential pressure… Read More

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Aerospace, Flight Testing, Military, Pressure Measurement

Absolute Pressure Sensor or Gage Pressure Sensor?

An absolute pressure sensor measures the pressure relative to zero absolute pressure or a perfect vacuum. A gage pressure sensor measures the pressure relative to the normal atmospheric pressure. This can sometimes lead to some confusion when ordering an absolute pressure sensor for pressures that can be easily measured by a gage pressure sensors. Because… Read More

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Pressure Measurement

Estimating the Frequency Response of Variable Reluctance Pressure Sensors in Gas

Summary – Frequency response is defined as the ability of a measurement system to accurately reflect dynamic pressure changes. The measurement system consists of a pressure sensor and its associated electronics and plumbing. Each component of the system affects the dynamic frequency response. This blog post will describe the factors affecting the frequency response of variable reluctance transducers, and… Read More

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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