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.
DMK457 Marine Approved Pressure Transmitter - Marine approved pressure transmitter with 4-20mA current loop output for shipbuilding with optional CuNiFe housing for sea-water compatibility
DS200P Sanitary Low Range Pressure Gauge, Switch and Sensor - All in one electronic switch, gauge and sensor designed specifically for use in the food, drink and biomedical industry for measuring process pressures.
DMP331P Hygienic Flush Pressure Transmitter - Sanitary pressure sensor wth exposed diaphragm with no crevices for high temperatures up to 300 Degrees Celsius in ranges from 100mb up to 40 bar gauge or absolute
DMP331 Precision Pressure Transmitter - Stainless steel pressure transmitter with ranges from 100mbar up to 40 bar gauge or absolute. Special options for ATEX , SIL2 and compound ranges.
IMP Low Cost Pressure Sensor - Versatile low price pressure sensor with a wide selection of electrical and mechanical options for customisation.
DMP320 0.5 msec Fast Response Pressure Sensor - High frequency response pressure sensor with a better than 0.5 millisecond response time and internal digital signal conditioning that samples readings at a rate of 10 kilohertz.
LEO3 Current or Digital Output Pressure Gauge - LCD digital pressure gauge powered externally by a 2 wire series 4-20mA current loop or a digital interface.
SSPT Subsea Wet-Mateable Electrical Connector Pressure Sensor - This stainless steel ceramic sensing diaphragm based subsea connector pressure sensor provides a unamplified ratiometric millivolt output or an amplified analogue output signal corresponding to ranges from 0…1 bar (14.50 psi) up to 400 bar ( 5800 psi).
DMP331i High Accuracy Pressure Transmitter - High precision pressure transmitter with an accuracy of 0.1%FS BSL NLHR and digitally adjustable pressure ranges from 400mb up to 40 bar gauge & absolute.
DMP333 High Range Precision Pressure Transmitter - The DMP 333 is a stainless steel 316L wetted parts pressure sensor for high pressure ranges on applications such as hydraulic test benches, presses, and hydraulic actuation.
DMK331P Flush Diaphragm Pressure Sensor - Screw-in pressure transmitter with flush stainless steel 316L diaphragm for measuring pressures of fluids with very high viscosity from 900 up to 6000 psi
DS200 Combined Pressure Switch, Gauge and Sensor - Three in one electronic pressure switch, digital pressure gauge and pressure sensor with pressure ranges from 100 mbar up to 600 bar (1.5 to 9000 psi).
- 5 to 20 psi absolute ambient 4 to 20 ma pressure transmitter
- Barometric 550 to 1150 hPa abs high resolution pressure transmitter
- Air flow normalising calculation barometric pressure transmitter
- 300°C max temperature, 0 to 300 bar, high range pressure sensor
- Detecting water intake blockage on submerged reservoir intake screen using two sensors
- Barometric pressure sensor for hurricane tracking on uncrewed surface vessel
- Near-atmospheric pressure transmitter for hazardous gas test chambers
- Marine approved atmospheric pressure sensor
- 800 to 1200 mbar atmospheric pressure transmitter
- 700 to 1100 millibar scaled 4 to 20mA output pressure sensor for barometric pressure measurement
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.