Key Benefits and Advantages
True Draft Range Optimization: Unlike standard transmitters that are simply “turned down” to reach low ranges, the EJA120E is built with a dedicated draft range capsule. This allows it to maintain high resolution and accuracy in the inches-of-water-column range, making it ideal for monitoring boiler air-to-fuel ratios and cleanroom pressurization.
Enhanced Accuracy with HAC Option: For critical processes where every fraction of a Pascal counts, the /HAC (High Accuracy) option improves the reference accuracy to ± 0.09% of span. This enables tighter process control, leading to improved combustion efficiency and reduced energy waste in industrial heating systems.
Certified for Safety-Critical Environments: Reliability in hazardous areas is guaranteed by Exida and TUV SIL 2/3 certification. The EJA120E is designed to integrate seamlessly into Safety Instrumented Systems (SIS), providing the dependable low-pressure monitoring required to prevent furnace back-pressure or ventilation failure.
Multi-Protocol Communication Flexibility: The EJA120E supports a wide array of industrial communication protocols, including HART 5/7, 1 to 5 VDC HART 7 (Low Power), FOUNDATION Fieldbus, PROFIBUS PA, and BRAIN. This ensures compatibility with both legacy control systems and modern, low-power remote monitoring sites.
Direct Field Adjustment via LPS: The Local Parameter Setting (LPS) feature allows technicians to perform range adjustments and basic configuration directly at the device using the external indicator. This reduces the need for specialized handheld communicators during routine field maintenance.
Stable Long-Term Performance: With a stability rating of ± 0.3% per year, the EJA120E minimizes the “drift” often associated with low-pressure sensors. This stability ensures that furnace draft control remains consistent over time, reducing the frequency of manual recalibration.
Technical Properties
Operation: Low-pressure differential sensing using DPharp silicon resonant technology.
Standard Accuracy: ± 0.2% of Span (± 0.09% with /HAC option).
Stability: ± 0.3% per 1 year.
Response Time: 150 ms.
Safety Rating: Exida and TUV SIL 2 / SIL 3 Certified.
Pressure Range: Designed for very low-pressure (draft) measurements (e.g., 0.1 to 1 kPa).
Mounting: Traditional-mount (54mm center-to-center) for easy manifold integration.
Field of Application
The EJA120E is the preferred choice for applications where extremely low differential pressure must be measured with high stability.
Primary Industries and Uses:
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Power Generation: Measuring furnace draft and secondary air flow to optimize combustion and prevent “puffing.”
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HVAC and Cleanrooms: Monitoring minute pressure differences between rooms to maintain sterile environments or laboratory safety.
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Glass and Ceramics: Controlling the draft in melting furnaces where pressure must be held at an extremely precise, near-neutral point.
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Environmental Monitoring: Tracking the low-velocity flow of flue gases in stacks for emissions compliance.
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Industrial Ovens and Dryers: Maintaining the correct balance of exhaust and makeup air for consistent product drying.
