Yokogawa EJX438A Remote Diaphragm Pressure Transmitter 4-20mA

Yokogawa EJX438A Remote Diaphragm Pressure Transmitter 4-20mA
The EJX438A diaphragm-sealed pressure transmitter adopts monocrystalline silicon resonant sensor technology. It is suitable for measuring the pressure and liquid level of media with high and low temperatures, high vacuum, high viscosity and easy crystallization, and features fast response, remote setting, self-diagnosis and other functions.
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Product Description

Product Description

The  EJX438A  diaphragm-sealed pressure transmitter adopts monocrystalline silicon resonant sensor technology. It is suitable for  measuring the pressure and liquid level of media with high and low temperatures, high vacuum, high viscosity and easy  crystallization, and features fast response, remote setting, self-diagnosis and other functions.


Core Technology

  • Ultra-high Accuracy: ±0.15% FS with excellent long-term stability.

  • Fast Response: 200ms response time, suitable for dynamic working conditions.

  • Safety Certification: SIL2 (Single Unit) / SIL3 (Redundancy), Exida & TUV Certified, Compliant with IEC 61508,  Yokogawa Electric Corporation.

  • Digital Sensing: DPharp Silicon Resonant Technology, direct digital output, anti-interference and zero drift.

  • Remote Seal: Isolates high-temperature / corrosive / viscous media, anti-clogging and maintenance-free.

  • Intelligent Compensation: Automatic density compensation for capillary filling liquid, minimizing the impact of  temperature/static pressure Yokogawa Electric Corporation.

  • Multi-protocol Communication: Supports HART 5/7, BRAIN, FF and PROFIBUS PA, compatible with mainstream systems.

  • Local Parameter Setting (LPS): Parameter configuration can be completed via local buttons without a handheld  communicator.


Application Scenarios

  • Petrochemical Industry: Pressure and liquid level measurement for reactors, distillation towers, and   high-temperature/corrosive media.

  • Oil and Gas Industry: Gauge pressure and liquid level monitoring of wellheads, pipelines and storage tanks.

  • Electric Power Energy: Pressure measurement for boilers, steam turbines, and high-temperature steam.

  • Pharmaceutical / Food Industry: Level / pressure measurement for aseptic processes and high-viscosity media  (syrup, fermentation broth).

  • Water Treatment / Environmental Protection: Pressure and liquid level monitoring of sewage, sludge and corrosive      liquids.



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Products Recommended

Pressure Transmitters for Industrial Pressure Measurement

Xinyi Instrument supplies pressure transmitters for process control, hydraulic systems, petrochemical plants, water treatment, HVAC, power generation and general industrial pressure monitoring. Our pressure transmitter range covers gauge pressure, absolute pressure, differential pressure, high temperature media and digital communication applications.

Choose from compact pressure transmitters, smart 3051 differential pressure transmitters, diaphragm seal models, RS485 digital pressure transmitters and high frequency dynamic pressure sensors. Standard outputs include 4-20 mA, voltage output, HART and RS485 Modbus options, with stainless steel wetted parts and custom process connections available on request.

Pressure Transmitter Parameters

Pressure Types Gauge, absolute, negative pressure, differential pressure
Measuring Range From low differential pressure to high pressure ranges up to 100 MPa, depending on model
Output Signals 4-20 mA, 0-5 V, 1-5 V, 0-10 V, RS485 Modbus, HART options
Accuracy Typical options include 0.1%, 0.2%, 0.25% and 0.5% FS
Process Connection M20 x 1.5, G1/4, G1/2, NPT and customized thread connections
Wetted Materials Stainless steel, 316L diaphragm and corrosion-resistant sealing options
Media Water, oil, gas, air, steam and compatible liquid or gas media
Applications Pipeline pressure, tank level, flow differential pressure, hydraulic pressure and automation systems

Recommended Pressure Transmitter Series

  • Xinyi YW-150 - differential pressure transmitter for stable industrial measurement.
  • Xinyi YW-3051DP - smart differential pressure transmitter for process control.
  • Xinyi YW-130 / YW-140 - compact pressure transmitters for general pressure monitoring.
  • RS485 Digital Pressure Transmitter - Modbus communication for remote monitoring systems.
  • High Temperature Pressure Transmitter - designed for hot media and demanding process conditions.
  • Siemens, Yokogawa and ABB Options - international brand transmitters available for project matching.

Pressure Transmitter FAQ

What is a pressure transmitter used for?

A pressure transmitter converts the pressure of liquid, gas or steam into a standard electrical signal for PLC, DCS, recorder or control instrument input. It is widely used for pipeline pressure, tank level, flow measurement and process safety monitoring.

How do I choose the right pressure transmitter?

Confirm the pressure range, pressure type, medium, temperature, output signal, accuracy, installation thread, electrical connection and environmental requirements. For corrosive media, high temperature or sanitary applications, diaphragm material and sealing structure are especially important.

What is the difference between gauge, absolute and differential pressure transmitters?

Gauge pressure transmitters measure pressure relative to atmospheric pressure. Absolute pressure transmitters measure pressure relative to vacuum. Differential pressure transmitters measure the pressure difference between two points and are commonly used for flow, filter and level measurement.

Can Xinyi Instrument provide customized pressure transmitters?

Yes. Xinyi Instrument can support customized pressure ranges, process connections, output signals, cable length, display options and model selection for different industrial applications.