Absolute Pressure

What Is an Absolute Pressure Transmitter?

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.


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, which is how absolute pressure transmitters relate to vacuum transmitters.

What Applications Use Absolute Pressure Devices?

  • Food and beverage
  • Lab
  • Industrial

What Are the 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



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

Smart devices, like Yokogawa’s line of Total Insight transmitters and flowmeters contribute to Digital Transformation during operations and throughout the lifecycle of the instrument.




Is it true that 4-20 mA HART will be phased out in the near future? Is a transducer equal to a transmitter? Tune in to hear the debunking of these myths.

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