Do fluctuating atmospheric conditions compromise the integrity of your critical pressure measurements? For applications involving toxic gas storage, vacuum distillation, or any process where a stable, non-varying reference point is mandatory, you need a device that ignores the weather. Yokogawa's absolute pressure transmitters measure pressure relative to a perfect (full) vacuum (absolute zero pressure). By using this static reference, they are completely unaffected by changes in local barometric pressure, ensuring data integrity for your most demanding and safety-critical operations.

Why Choose Yokogawa Absolute Pressure Transmitters? Solving Atmospheric Interference & Stability Challenges

Achieve unwavering confidence in your pressure monitoring with intelligent features that directly address common industrial pain points.

• Eliminate Atmospheric Pressure Errors: Standard gauge pressure readings shift with every passing weather front or facility HVAC change. A Yokogawa absolute pressure transmitter uses a sealed vacuum reference, so its measurements are true thermodynamic pressures. This is imperative for applications like toxic gas storage, where an inaccurate reading due to a drop in atmospheric pressure could lead to a leak or process upset. All measurements are positive and indicated by an 'a' or 'abs' (e.g., psia).

• Unmatched Long-Term Stability for Critical Processes: Stop questioning your data's integrity over years of operation. The core of these instruments is the digital DPharp sensor, renowned for its exceptional long-term stability. Depending on the series, you can expect ±0.2% of URL stability for up to 15 years, drastically reducing the need for recalibration and providing unwavering confidence in long-term data trends for regulatory compliance and process safety.

• High Accuracy for Demanding Applications: When every millibar matters, trust the industry leader. With high accuracy options reaching ±0.04% of span, these AP transmitters capture minute pressure changes with exceptional precision. This level of performance is critical for applications like vacuum research, vapor pressure monitoring, and precise material science experiments where atmospheric interference cannot be tolerated.

Key Features for Demanding Industrial Applications

Engineered for longevity, precision, and safety:

• Proven Sensor Technology: The DPharp digital sensor is the industry standard for reliability, using advanced silicon resonant sensor technology to provide exceptional accuracy and repeatability over a wide range of absolute pressures.

• Flexible Mounting Options: Choose the configuration that fits your installation. Available in both traditional-mount and in-line mount styles to simplify installation and reduce hardware costs across various piping configurations.

• Inherent Safety & Reliability: Designed for critical applications, these transmitters are backed by FMEDA reports and IEC 61508 certification for SIL 2 applications, ensuring they meet the highest functional safety standards for processes involving hazardous materials.

• Superior Quality Control: Manufactured to a ±3σ specification conformance, guaranteeing that the performance you specify is the performance you get, unit after unit, ensuring consistency across your facility.

Technical Specifications at a Glance

Measurement Principle & Performance

• Measurement Type: Absolute Pressure (referenced to perfect vacuum / absolute zero pressure)

• Sensor Technology: Digital DPharp (Silicon Resonant Sensor)

• Typical Applications: Toxic gas storage, vacuum distillation, vapor pressure monitoring, material science, high-altitude simulation

• Atmospheric Influence: None – readings are unaffected by local barometric pressure fluctuations

• Accuracy (Available Options):

• ±0.04% of Span (High Performance EJX-A Series)

• ±0.055% of Span

• ±0.075% of Span (Standard EJA-E Series)

• ±0.10% of Span

• Long-Term Stability:

• Up to ±0.2% of URL per 15 years (EJX-A Series High Performance)

• ±0.2% of URL per 10 years (EJA-E Series Standard)

• Response Time: 90 msec (standard)

Model Series & Mounting Styles

Yokogawa offers a comprehensive range to match any requirement:

Functional Safety & Compliance

• Safety Certification: IEC 61508 certified for use in SIL 2 safety instrumented functions

• Documentation: FMEDA reports available for safety lifecycle calculations

• Quality Conformance: Manufactured to ±3σ (three-sigma) specifications

Outputs & Communication

• Analog Output: 4-20 mA HART (standard on most models)

• Digital Protocols: FOUNDATION Fieldbus, PROFIBUS PA (available options)

• Local Indication: Optional digital indicator for on-site reading

Ready to Achieve True Pressure Measurement Independent of the Atmosphere?

Whether you are safeguarding a toxic gas storage facility or conducting precise vacuum research, Yokogawa's absolute pressure transmitters deliver the precision and reliability you need.