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Home > Electrical & Electronics > Transmitter > Pressure Transmitter > YOKOGAWA EJX438A Gauge Pressure Transmitter With Remote Diaphragm Seal

YOKOGAWA EJX438A Gauge Pressure Transmitter With Remote Diaphragm Seal

Product Spotlights

The YOKOGAWA EJX438A Transmitter features a remote diaphragm seal for measuring high-temperature, corrosive, or viscous media safely. It uses a stable silicon resonant sensor for ±0.04% accuracy, offers wide turndown, and supports HART/Fieldbus protocols. This design reduces maintenance, enhances safety, and ensures reliable performance in demanding applications like chemical and power plants.

Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

Key Specifications

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Model:

YOKOGAWA EJX438A

Measurement Type:

Gauge Pressure

Seal Type:

Remote Diaphragm Seal

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Rossonix Co.,limited

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
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Model YOKOGAWA EJX438A

Measurement Type Gauge Pressure

Seal Type Remote Diaphragm Seal

Output Signal 4-20 mA HART, BRAIN, FOUNDATION Fieldbus

Process Connection Flanged or threaded, customizable

Accuracy ±0.04% of calibrated span

Operating Temperature -40 to 85°C (-40 to 185°F)

Material (Wetted Parts) Hastelloy C-276, 316L SS, optional

Application High-temperature, viscous, or corrosive media

Communication Protocol HART, BRAIN, FOUNDATION Fieldbus

As a trusted supplier in the industrial automation field, Rossonix Co., Limited leverages over a decade of experience since 2011 to provide reliable measurement solutions to a global clientele. We are pleased to offer the YOKOGAWA EJX438A Gauge Pressure Transmitter with Remote Diaphragm Seal, a precision instrument engineered for challenging process conditions where direct sensor contact is impractical or damaging. This transmitter delivers exceptional stability and accuracy, enabling precise control and monitoring in critical applications from chemical processing to power generation.

The core innovation of the EJX438A lies in its remote diaphragm seal system. This design physically separates the sensitive electronics of the transmitter from the process media by using a capillary tube filled with a stable fill fluid connected to a diaphragm seal. This configuration is essential for measuring:

High-Temperature Media: Protects the sensor from temperatures that exceed its normal operating range.
Viscous or Slurries: Prevents clogging of the impulse line or sensor cavity.
Corrosive or Hazardous Chemicals: The seal's wetted parts can be specified in corrosion-resistant alloys, isolating the transmitter body.
Crystallizing or Polymerizing Fluids: Eliminates points where media can solidify and block measurement.

The transmitter itself is built on YOKOGAWA's proven single-crystal silicon resonant sensor technology. This technology provides outstanding long-term stability, high accuracy, and robustness against vibration and shock, which are common in industrial environments.

Key Technical Specifications & Advantages:

Feature	Specification / Benefit
Measurement Accuracy	Up to ±0.04% of calibrated span, ensuring reliable data for process control.
Sensor Technology	Single-crystal silicon resonant sensor for minimal drift and high stability.
Turndown Ratio	Wide turndown (up to 100:1), offering great flexibility across varying range requirements.
Diagnostics	Advanced self-diagnostics and condition monitoring via HART/Fieldbus protocols.
Diaphragm Seal Options	Available in flat, flush, extended, and tank-mounted designs with various materials (Hastelloy, Tantalum, 316L SS).
Fill Fluid Options	Silicone oil, fluorocarbon, glycerin, etc., selected based on process temperature and compatibility.

Benefits for Your Operation:

Reduced Maintenance: By isolating the transmitter from harsh media, you significantly lower the risk of sensor damage, corrosion, or clogging, leading to less downtime and lower maintenance costs.
Enhanced Safety: Safely measure hazardous, toxic, or sterile processes without risk of leakage at the transmitter housing.
Improved Process Accuracy: Eliminate errors caused by ambient temperature effects on long impulse lines or by media solidification in traditional setups.
Configuration Flexibility: With multiple communication protocols (HART, BRAIN, FOUNDATION Fieldbus), the transmitter integrates seamlessly into both new and legacy control systems.
Long Service Life: The rugged construction and isolated design contribute to a longer operational lifespan, providing a strong return on investment.

Backed by Rossonix's commitment to quality, reflected in our adherence to ISO9001 standards, and supported by an annual export value in the multi-million dollar range, we ensure reliable supply and professional support. Our presence across major global markets, from North America and Western Europe to Asia and the Middle East, coupled with flexible shipment options from Shenzhen, Hong Kong, or Europe, allows us to serve your needs efficiently. Choose the YOKOGAWA EJX438A with Remote Diaphragm Seal for a robust, accurate, and maintenance-friendly pressure measurement solution that protects your process and your bottom line. Contact us today to discuss your specific application requirements and receive a detailed quotation.

Frequently Asked Questions (FAQ):

Q: When should I use a remote diaphragm seal instead of a direct-mount transmitter?
A: Remote seals are recommended for processes involving high temperatures (beyond the transmitter's rating), viscous slurries, corrosive chemicals, crystallizing fluids, or when hygiene is critical (e.g., food & pharmaceutical). They prevent sensor damage and clogging.
Q: How does the capillary length affect the measurement?
A: The length and diameter of the capillary tube, along with the fill fluid's properties, create a thermal effect that can introduce a zero shift with ambient temperature changes. The EJX438A's electronics can compensate for this effect, but it's important to specify the required capillary length during ordering for optimal performance.
Q: What factors determine the choice of diaphragm seal material and fill fluid?
A: The seal material (e.g., Hastelloy C-276, 316L SS) must be compatible with the process media to resist corrosion. The fill fluid (e.g., silicone oil, fluorocarbon) is chosen based on its temperature range, viscosity, and chemical compatibility with the process media in case of diaphragm rupture.
Q: Can this transmitter be integrated with my existing DCS or PLC system?
A: Yes. The EJX438A is available with standard 4-20 mA HART, YOKOGAWA's BRAIN, or FOUNDATION Fieldbus digital protocols. The 4-20 mA HART version is widely compatible with most control systems.
Q: What is the typical delivery time for a configured unit?
A: Delivery time depends on the specific configuration of the transmitter, seal, and capillary. Standard configurations may have shorter lead times, while custom material or flange specifications may require additional manufacturing. We provide estimated timelines upon quotation.
Q: How is the calibration performed, and is it traceable?
A: The transmitter is calibrated at the factory. We can provide calibration certificates upon request. For critical applications, discuss your traceability requirements with our team.
Q: What maintenance does the remote seal system require?
A: The system is generally maintenance-free. Primary checks involve inspecting the capillary tube for kinks or damage and verifying there are no leaks. The fill fluid is sealed for life under normal conditions.
Q: Do you provide technical support for installation and configuration?
A: Yes, Rossonix provides technical documentation and support for installation and basic configuration. For complex system integration, we can guide you to appropriate resources or documentation from the manufacturer.