Yokogawa EJA130A differential pressure transmitter

1.General Description

The Yokogawa EJA130A Differential Pressure Transmitter is a member of Yokogawa’s DPharp series, renowned for its innovative design, rugged construction, and superior performance. Engineers designed this DP Harp High Static Differential Pressure Transmitter for high-pressure use. It gives accurate and stable measurements of liquid, gas, or steam flow in many industrial settings.

The EJA130A has a Yokogawa DPharp active sensor. It provides great long-term stability and accuracy, even in tough conditions. The silicon resonant sensor design allows for accurate detection of differential pressure.

This is great for controlling processes. Also, it is useful for measuring flow. Additionally, it helps with monitoring in the oil and gas, chemical, and power generation industries.

Models like the EJA130A-EMS4A-92DA/NF1 from Yokogawa offer strong performance. They have advanced communication features and diaphragm-sealed wetted parts. This design ensures safety and reliability in high-static environments.

2.Technical Specifications

l Model: EJA130A

l Type: High Static Differential Pressure Transmitter

l Measurement Type: Differential Pressure (DP)

l Static Pressure Range: Up to 200 bar

l Accuracy: ±0.2% of span

l Output Signal: 4 to 20 mA DC with digital communication (HART or BRAIN)

l Power Supply: 12 to 42 VDC

l Operating Temperature Range: -40°C to +85°C

l Process Connection: Flanged or threaded options (diaphragm sealed optional)

l Material: Stainless steel housing with corrosion-resistant wetted parts

l Measured Differential Pressure: Suitable for liquid, gas, or steam flow applications

l Communication Options: Supports integration with DCS and field communication systems

3.Yokogawa EJA130A Features

l DPharp Active Sensor Technology:

Utilizes Yokogawa’s DPharp active sensor for superior precision, temperature stability, and long-term reliability.

l High Static Pressure Design:

This is a High Static Differential Pressure Transmitter. It can handle process pressures up to 200 bar without losing performance.

l Rugged Construction:

Built to withstand harsh environments; stainless steel housing and diaphragm-sealed wetted parts ensure durability and corrosion resistance.

l Digital Communication:

Compatible with HART and BRAIN protocols, allowing easy calibration, diagnostics, and data integration with modern control systems.

l Self-Diagnostics and Integral Indicator (Optional):

Real-time performance monitoring and on-site pressure display enhance operational efficiency and maintenance planning.

l Reliable Output Signal:

Provides a stable 4–20 mA DC output signal, ensuring accurate data transmission to control systems.

4. Yokogawa EJA130A Applications

The EJA130A Differential Pressure Transmitter is suitable for a wide range of applications, including:

A. Oil and Gas Industry: High-pressure flow and differential pressure monitoring.

 B. Chemical and Petrochemical Processing: Accurate liquid and gas flow measurement.

 C. Water Treatment Facilities: Pressure and level control.

 D. HVAC Systems: Differential air pressure and flow monitoring.

 E. Power Generation: Boiler drum pressure and steam measurement.

5.Installation Procedure Step by Step

l Preparation

Review the installation manual thoroughly and ensure all safety protocols are followed.

Gather necessary tools, electrical fittings, and calibration equipment.

l Mounting Location

Select a location that allows easy access for maintenance.

Ensure minimal vibration and protection from extreme temperatures.

l Pressure Connection

Connect impulse lines to the high and low-pressure ports securely.

For diaphragm sealed models, check that you properly fill and install the seals.

Use correct flanged or threaded connections to prevent leaks.

l Electrical Connections

Ensure the power supply is off before wiring.

Connect power and signal lines according to the wiring diagram.

Verify proper grounding and polarity for safe operation.

l Zero Adjustment

Perform a zero trim using the integral indicator or HART communicator.

Confirm output returns to 4 mA DC under zero differential pressure.

l Testing

Conduct a loop test to verify proper output signal (4–20 mA DC) response.

Apply known pressure values and compare readings for accuracy verification.

l Final Checks

Inspect all mechanical and electrical connections for tightness.

Confirm that you have correctly sealed and securely mounted the transmitter.

Record installation parameters for maintenance documentation.

6.Yokogawa EJA130A Related Part Numbers

l EJA130A-HAC: High Accuracy version

l EJA130A-FB: FOUNDATION Fieldbus communication model

l EJA130A-PB: PROFIBUS PA communication model

l EJA130E Yokogawa / eja130e Yokogawa: Enhanced digital version with improved diagnostics

l Yokogawa EJA440A / Yokogawa EJA440E / Yokogawa EJX430A: Alternative high-performance differential pressure transmitters for higher pressure ranges

       Yokogawa EJA510A Absolute Pressure Transmitter

       Yokogawa EJA118E Diaphragm-Pressure Transmitter