Yokogawa EJA120E differential pressure transmitter

Yokogawa EJA120E General Description

The EJA120E is part of Yokogawa's DPharp family of pressure transmitters. It combines the ruggedness of the EJA series with the advanced performance characteristics of the EJX-A series. This model is particularly suited for applications requiring precise draft range measurements.

Technical Specifications

l Measurement Type: Differential Pressure (Draft Range)

l Accuracy: ±0.2% of Span (±0.09% available with /HAC option)

l Response Time: 150 ms

l Stability: ±0.3% per year

l Output Signal: 4 to 20 mA DC

l Communication Protocols: HART 5/7, 1 to 5 VDC HART (Low Power), FOUNDATION Fieldbus, PROFIBUS PA, BRAIN

l Temperature Range: -55 to 60 °C

l SIL Certification: Exida and TUV SIL 2/3 Certified

Yokogawa EJA120E Features

1. Local Parameter Setting (LPS): Simplifies configuration and adjustments.

2. Signal Characterization: Allows compensation for non-linear applications.

3. Self-Diagnostics: Monitors for CPU failure, hardware issues, and over-range errors.

4. Integral Indicator (Optional): LCD for real-time monitoring.

Applications

The EJA120E is widely used in industries such as:

Ø Oil and Gas

Ø Water Treatment

Ø Chemical Processing

Ø HVAC Systems

Installation Procedure Step by Step

1. Preparation:

Review the installation manual and safety precautions.

Gather necessary tools and materials.

2. Mounting Location:

Select an appropriate location considering environmental factors.

Ensure accessibility for maintenance.

3. Pressure Connection:

Connect impulse piping to the transmitter, ensuring no leaks.

Use appropriate fittings based on application requirements.

4. Electrical Connections:

Follow the wiring diagrams provided in the manual.

Connect the power supply to ensure proper voltage and load resistance.

5. Zero Adjustment:

Perform zero-point adjustment as per guidelines.

Verify settings using the integral indicator if applicable.

6. Testing:

Conduct a loop test to confirm proper operation.

Monitor output signals to ensure accuracy.

7. Final Checks:

Secure all connections and ensure no loose parts.

Document installation details for future reference.

Yokogawa EJA120E Related Part Numbers

l EJA120E-HAC (High Accuracy)

l EJA120E-FB (Foundation Fieldbus)

l EJA120E-PB (PROFIBUS PA)

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