YOKOGAWA EJA438W DIAPHRAGM PRESSURE TRANSMITTER EJA438N

Description:

The Yokogawa EJA438W / EJA438N is a DPharp gauge pressure transmitter equipped with a remote diaphragm seal system. The diaphragm seal isolates the process fluid from the sensor using a capillary filled system, making it ideal for corrosive, viscous, high-temperature, or sanitary applications. The EJA438W is a flush-type seal, while the EJA438N is an extended-type seal. These transmitters provide stable pressure measurement with digital accuracy and long-term reliability. 

Applications:

The Yokogawa EJA438W / EJA438N transmitter is used in process control systems for measuring pressure in liquids, gases, and steam where direct contact with the sensor is not suitable. The Yokogawa transmitter is commonly installed on tanks, reactors, pipelines, and vessels for pressure and level measurement in industries such as chemical processing, oil & gas, food processing, and pharmaceuticals.

Technical Specifications:

• Manufacturer: Yokogawa
• Model / Series: EJA438W (flush diaphragm) / EJA438N (extended diaphragm)
• Product Type: Gauge Pressure Transmitter with Remote Diaphragm Seal
• Technology: DPharp resonant silicon sensor
• Output Signal: 4–20 mA DC with digital communication
• Accuracy: approx. ±0.2% of span
• Response Time: ~700 ms
• Measurement Type: Gauge pressure (liquid, gas, steam)
• Seal Type: Remote diaphragm seal with capillary fill fluid
• Function: Prevents process media from entering sensor
• Mounting: Remote seal (flanged, flush, or extended)
• Communication: BRAIN / HART / Fieldbus (config dependent

Common Replacements:

• Yokogawa EJA438E (newer generation)
• Yokogawa EJX438A (higher performance upgrade)
• Emerson Rosemount 3051 with remote seal