Absolute Pressure

Absolute pressure (AP) transmitters measure relative to perfect (full) vacuum pressure (absolute zero pressure); therefore, AP transmitters are not affected by fluctuations in the local atmospheric pressure. All absolute pressure measurements are positive. The letter ‘a’ or the abbreviation ‘abs’ in the unit of measure (i.e., inH₂O(abs) or psia) indicates an absolute pressure measurement.

Yokogawa absolute pressure transmitters use digital DPharp sensor technology to get accurate, reliable readings to you quickly.

Which Series is Right for You?

View the comparison chart.

  • EJX310A

    • EJX310A Traditional-mount Absolute Pressure Transmitter
    • ± 0.075% Accuracy
    • ± 0.2% per 15 years Stability
    • 90 ms Response Time
    • Exida and TUV SIL 2/3 Certification
    • LPS
    See More
  • EJX610A

    High Performance In-Line Mount Absolute Pressure Transmitter based on the EJX-A Series.

    See More


What is Absolute Pressure?

Measured in PSIA, (pounds per square inch absolute) absolute pressure refers to pressure detected in relation to a vacuum, a.k.a. absolute zero pressure. That's how absolute pressure transmitters relate to vacuum transmitters.

Industrial Applications of Absolute Pressure Devices

Pipe, tank, and substance pressure measurement and regulation:

  • Food and beverage
  • Lab
  • Industrial

Benefits of Absolute Pressure Devices

Process and loop monitoring for open tanks and vessels

Example Industrial Application: Any critical storage and delivery application (i.e., toxic gases) Because atmospheric conditions can fluctuate, it is imperative that these systems be accurate and use a reference that is static.

Which Series is Right for You?

  Absolute Pressure Absolute Pressure
EJA-E Series EJX-A Series
± 0.04%
± 0.055%  
± 0.075%  
± 0.10%  
± 0.2% of URL per 10 years  
± 0.2% of URL per 7 years  
± 0.1% of URL per 1 year  
Response Time
90 msec
In-line Mount
FMEDA Report
IEC 61508 Certified (SIL 2)
Specification Conformance



Yokogawa DPharp EJA/EJX Pressure transmitters do not need frequent re-zeroing due to superior long term stability, it contributes to reduce maintenance time.


Download this eBook and learn:

  • The basic physics of pressure
  • Different types of pressure sensors
  • Features of pressure transmitters
  • Pressure transmitters communications standards
  • Key characteristics of pressure
  • Common types of diaphragm seals
584 KB


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