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Home > Electrical & Electronics > Transmitter > Pressure Transmitter > YOKOGAWA EJA438 Diaphragm Sealed Gauge Pressure Transmitters

YOKOGAWA EJA438 Diaphragm Sealed Gauge Pressure Transmitters

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Product Spotlights

The YOKOGAWA EJA438 Diaphragm Sealed Gauge Pressure Transmitter provides reliable and accurate pressure measurement for harsh process environments. Its key diaphragm seal isolates the sensor from corrosive, viscous, or high-temperature media, ensuring long-term stability and reducing maintenance. Featuring high accuracy, flexible configuration with various seal materials and fill fluids, and standard 4-20mA/HART output, it enhances process safety and control reliability in industries like chemical, oil & gas, and power generation.

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

Key Specifications

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Type:

Other, Diaphragm Sealed Gauge Pressure Transmitter

Certification:

Other, ISO9001, ISO9000 (Manufacturer)

Brand:

YOKOGAWA

Contact Supplier Request Quote Chat Now

Rossonix Co.,limited

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
Company Profile
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Type Other, Diaphragm Sealed Gauge Pressure Transmitter

Certification Other, ISO9001, ISO9000 (Manufacturer)

Brand YOKOGAWA

Model EJA438

Application Process control in harsh environments

Output Signal 4-20 mA, HART protocol

Process Connection Flanged diaphragm seal

Mounting Direct or remote mounting

Accuracy High accuracy, customizable

Material (Seal/Diaphragm) 316L stainless steel or other alloys

As a trusted supplier with over a decade of experience in industrial instrumentation, Rossonix Co., Limited proudly offers the YOKOGAWA EJA438 Diaphragm Sealed Gauge Pressure Transmitter. This transmitter represents a reliable solution for demanding process control applications where direct sensor contact with the process media is undesirable or impossible. We understand the critical need for accurate and stable pressure measurement in industries like chemical processing, oil & gas, and power generation. The EJA438, with its robust diaphragm seal design, provides that essential isolation, protecting the sensitive sensor from corrosive, viscous, crystallizing, or high-temperature media, thereby ensuring long-term measurement integrity and reducing maintenance costs.

The core value of the EJA438 lies in its ability to deliver precise gauge pressure readings in challenging conditions. By utilizing a diaphragm seal system, it acts as a barrier, transmitting the process pressure to the transmitter's sensor through a fill fluid. This design is crucial for applications involving:

Corrosive Liquids or Gases: Acids, alkalis, and other aggressive chemicals.
Viscous or Slurry Media: Paints, adhesives, food products, and wastewater.
Media that Crystallize or Solidify: Certain polymers or sugars that can clog standard ports.
High-Temperature Processes: Where direct sensor exposure would damage the electronics.
Sanitary or Hygienic Requirements: Where cleanability and prevention of contamination are paramount.

Let's delve into the specific features and technical specifications that make the YOKOGAWA EJA438 a preferred choice.

Key Features and Advantages:

Robust Diaphragm Seal Construction: The seal is typically made from durable materials like 316L stainless steel, Hastelloy, or other alloys suitable for the application, ensuring resistance to corrosion and mechanical stress.
High Accuracy and Stability: Leveraging YOKOGAWA's advanced sensor technology, the transmitter maintains high accuracy over a wide range of pressures and temperatures, providing dependable data for process control.
Flexible Configuration: The EJA438 series offers various options for diaphragm seal types (flanged, threaded, sanitary), fill fluids (silicone oil, glycerin, etc.), and process connections to match specific installation needs.
Easy Integration and Communication: It outputs a standard 4-20 mA analog signal and often supports digital communication protocols like HART, facilitating easy integration into existing control systems (DCS, PLC).
Reduced Maintenance & Downtime: By isolating the sensor, the diaphragm seal prevents fouling and damage, significantly extending the transmitter's service life and reducing the frequency of calibration or replacement.
Safety Enhancement: In processes with hazardous media, the seal provides an additional layer of containment, improving overall plant safety.

Technical Specifications Overview:

Parameter	Typical Specification / Options
Measurement Type	Gauge Pressure (Relative Pressure)
Pressure Range	Available in multiple ranges (e.g., 0~100 kPa, 0~1 MPa, 0~10 MPa, etc.)
Accuracy	High accuracy class (specific value depends on model configuration)
Output Signal	4-20 mA DC, two-wire system; HART protocol support
Process Connection (Seal)	Flanged connection (e.g., ANSI, DIN, JIS), threaded, or sanitary fitting
Diaphragm Material	316L Stainless Steel, Hastelloy C276, Monel, Tantalum (customizable)
Fill Fluid	Silicone Oil, Glycerin, Fluorocarbon Oil (selectable based on temperature & media)
Operating Temperature	Limited by fill fluid and seal material; options for high-temperature applications
Electrical Connection	M20 x 1.5 conduit connection or other standard fittings
Mounting	Direct mounting on the seal or remote mounting via capillary tube

Benefits for Your Operation:

Process Reliability: Consistent and accurate pressure data ensures stable process control, improving product quality and yield.
Cost-Effectiveness: Lower lifetime cost due to reduced sensor failures, less frequent maintenance, and longer calibration intervals.
Operational Flexibility: Ability to monitor pressure in processes previously difficult or impossible to measure with standard transmitters.
System Compatibility: Standard industrial signals and protocols mean easy installation and integration without major system modifications.
Risk Mitigation: Enhanced safety and containment for handling dangerous process fluids.

Rossonix Co., Limited, established in 2011 and with an annual export value between US$5 Million and US$10 Million, serves a global clientele across North America, South America, Europe, Asia, and other key markets. Our experience and network allow us to reliably supply high-quality instrumentation like the YOKOGAWA EJA438. We operate from strategic ports like Shenzhen and Hong Kong, ensuring efficient logistics. The manufacturer's adherence to ISO9001 and ISO9000 quality management standards underpins the product's consistency and reliability. Choosing the EJA438 through Rossonix means selecting a pressure measurement solution backed by a reputable brand, proven technology, and a supplier with extensive international trade expertise. This combination delivers not just a product, but a partnership aimed at enhancing your process efficiency and reliability.

Frequently Asked Questions (FAQ):

Q: What is the primary purpose of the diaphragm seal in the EJA438 transmitter?
A: The diaphragm seal acts as a protective barrier. It isolates the transmitter's sensitive pressure sensor from direct contact with the process media, which is essential when the media is corrosive, viscous, prone to clogging, or at high temperatures. The seal transfers pressure via a fill fluid, protecting the sensor and ensuring accurate, long-term measurement.
Q: Can the EJA438 be used for absolute pressure measurement?
A: The "Gauge Pressure" designation in the title indicates it measures pressure relative to atmospheric pressure. For absolute pressure measurement (relative to a perfect vacuum), a different model from the YOKOGAWA EJA series would typically be required. Please inquire for absolute pressure transmitter options.
Q: How do I select the appropriate diaphragm material and fill fluid?
A: Selection depends entirely on your process conditions. The diaphragm material must be compatible with (resist corrosion from) the process media. The fill fluid must have suitable viscosity and temperature characteristics for the operating range. We can assist you based on your specific media type, temperature, pressure, and other requirements.
Q: Is remote mounting possible with this transmitter?
A: Yes. The EJA438 can be configured with a capillary tube connecting the diaphragm seal to the transmitter body. This allows for remote mounting, which is useful when the process point is in a hazardous location, at extreme temperatures, or where space at the connection point is limited.
Q: What communication protocols does it support?
A: The transmitter provides a standard 4-20 mA analog output. Many configurations also support the HART digital communication protocol, which allows for remote configuration, calibration, and diagnostics using a HART communicator without interrupting the analog signal.
Q: What is the typical accuracy achievable with the EJA438?
A: Accuracy is a key specification that varies with the specific model and pressure range selected. YOKOGAWA transmitters are known for high accuracy. Please provide your required pressure range, and we can specify the available accuracy class for that model.
Q: Does Rossonix provide calibration services or support for these transmitters?
A: As a trading company, we primarily supply the products. Calibration is typically performed by the end-user or specialized service providers according to their quality procedures. However, we can facilitate sourcing transmitters that are pre-calibrated by the manufacturer to specific requirements if needed.
Q: What are the main industries that use this type of transmitter?
A: The EJA438 is widely used in industries with challenging process media, including Chemical & Petrochemical, Oil & Gas (upstream and downstream), Pharmaceutical, Food & Beverage, Power Generation (including nuclear), Water & Wastewater Treatment, and Pulp & Paper.