Absolute Pressure Transmitters for Vacuum Referenced Ranges with 4-20mA Output

Absolute pressure transmitters with 4-20mA output, designed for precise measurements against a perfect vacuum. Ideal for leak testing, vacuum processes, and barometric-independent applications.

Absolute pressure transmitters provide a critical pressure measurement solution by utilizing a perfect vacuum as their reference point, ensuring that readings are completely independent of ambient atmospheric pressure fluctuations. These instruments typically output a standard 4-20mA signal, where 4mA corresponds to a perfect vacuum, making them indispensable for applications such as monitoring sealed vessels for minute leaks over time, controlling precise vacuum levels in manufacturing processes and conducting research in altitude simulation chambers. Their design is particularly beneficial for design engineers, process engineers, and instrument technicians who require high accuracy and long-term stability in environments where barometric changes could otherwise skew critical process data.

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Find out more about Absolute Pressure Transmitters to determine which product options and capabilities will best meet your application requirements.

Absolute pressure transmitters featuring a 4-20mA current loop output are specifically engineered to provide precise pressure measurements relative to a perfect vacuum. This means the sensor’s reference point is a permanently sealed chamber containing no air or gas, ensuring that the output signal is unaffected by fluctuations in local atmospheric pressure. The critical 4mA signal is generated when the process pressure is at 0 PSIA (pounds per square inch absolute), or a complete vacuum, scaling linearly up to 20mA at the transmitter’s full-scale pressure range. This type of transmitter is indispensable in applications where the accurate determination of pressure, independent of barometric changes, is paramount.

The core of an absolute pressure transmitter’s utility lies in its absolute reference. Unlike gauge or differential pressure transmitters that reference ambient atmospheric pressure or another process pressure respectively, the absolute transmitter provides a stable and unchanging baseline. This is often achieved through a meticulously sealed diaphragm sensor where one side is exposed to the process media and the other to the internal vacuum. This design is crucial for process engineers and instrument technicians working on applications such as vacuum packaging lines, where maintaining a specific sub-atmospheric pressure is key to product quality and shelf life, or in pharmaceutical freeze-drying processes where precise vacuum levels control the sublimation rate.

Another significant application where absolute pressure transmitters excel is in long-term leak detection for sealed systems. Consider a hermetically sealed container, such as a fuel tank for a satellite, a high-voltage switchgear enclosure filled with SF6 gas, or specialized scientific apparatus operating under controlled atmospheres. Over extended periods, even minor changes in barometric pressure could be misinterpreted as a leak or pressure build-up if a gauge pressure transmitter were used. The absolute pressure transmitter, by referencing a true vacuum, eliminates this variable, allowing for the detection of minute, actual pressure changes within the sealed vessel, which is invaluable for preventative maintenance and system integrity validation by reliability and maintenance engineers.