Wireless Gauge Pressure Measurement for Industrial Applications
The Yokogawa EJX430B is a high-performance wireless gauge pressure transmitter in the EJX-B series.
Unlike an absolute pressure transmitter, the EJX430B measures pressure relative to atmospheric pressure. This makes it suitable for a wide range of industrial pressure monitoring applications involving liquids, gases, and steam.
The transmitter combines Yokogawa's single-crystal silicon resonant sensing technology with ISA100.11a wireless communication, allowing measured process values and device setting parameters to be transmitted without conventional signal wiring.
Why Choose Wireless Gauge Pressure Measurement?
In many industrial facilities, adding a new pressure measurement point is not simply a matter of installing a transmitter. New cable routes, conduit, cable trays, and shutdown-related installation work can significantly increase project complexity.
The EJX430B is designed to reduce this infrastructure requirement by using battery-powered wireless communication.
It is particularly useful when:
- Measurement points are far from existing control infrastructure
- New signal cabling would be expensive or difficult to install
- Additional monitoring points are needed in an existing plant
- Pressure points are distributed across a large facility
- A retrofit project needs to minimize installation work
- Remote or difficult-to-access equipment requires pressure monitoring
Yokogawa positions the EJX-B wireless series for liquid, gas, and steam applications as well as broader level, density, and pressure measurement requirements.
Key Features
- Wireless gauge pressure transmitter
- Single-crystal silicon resonant sensor
- ISA100.11a industrial wireless communication
- Internal battery-powered operation
- Wireless transmission of process variables
- Wireless transmission of setting parameters
- Long-life battery design
- Two high-capacity lithium-thionyl chloride batteries
- Selectable wireless update interval from 0.5 second to 60 minutes
- Infrared communication for wireless network configuration and parameter setting
- Available measurement capsules for low, medium, and high pressure ranges
- Suitable for liquid, gas, and steam applications
- Designed to reduce conventional hard-wiring requirements
Gauge Pressure Measurement Range Options
The EJX430B is available with multiple pressure capsules, allowing the transmitter to cover a broad range of gauge pressure applications:
- H Capsule: 2.5 to 500 kPa
- A Capsule: 0.0175 to 3.5 MPa
- B Capsule: 0.08 to 16 MPa
The appropriate capsule should be selected according to the actual operating pressure, required measurement span, and process conditions.
ISA100.11a Wireless Communication
The EJX430B uses ISA100.11a, an industrial wireless communication protocol designed for process automation applications.
Yokogawa's EJX-B wireless platform operates in the 2.4 GHz license-free ISM band and supports AES-128 wireless security. The wireless update interval can be configured from 0.5 second to 60 minutes, allowing users to balance measurement responsiveness and battery consumption according to application requirements.
Long-Life Battery Operation
The EJX430B uses an ultra-low-current design with two high-capacity lithium-thionyl chloride batteries.
This allows the transmitter to operate wirelessly for extended periods without requiring conventional wired power for normal battery-powered configurations. Actual battery performance depends on factors such as the configured update interval, network conditions, and operating environment.
Secure Wireless Network Configuration
The EJX430B supports secure wireless network joining and uses infrared communication between devices for wireless network configuration and parameter setting.
This helps support device commissioning without relying on conventional wired communication at the measurement point.
Typical Applications
Remote Pressure Monitoring
The EJX430B is suitable for monitoring pressure at equipment located far from existing control-system wiring.
Gas and Steam Pressure
Its gauge pressure measurement capability makes it suitable for gas and steam pressure monitoring applications where the process reference is atmospheric pressure.
Liquid Process Pressure
The transmitter can be used to monitor pressure in pipelines, vessels, pumps, and other liquid process equipment.
Plant Expansion
Wireless communication can simplify the installation of additional pressure measurement points when extending an existing facility.
Retrofit Projects
For existing plants, reducing the need for new signal cables can help minimize installation work when additional instrumentation is required.
Distributed Monitoring
The EJX430B is suitable for facilities with measurement points distributed across large areas, where conventional cabling would increase installation complexity.
Frequently Asked Questions
What is the Yokogawa EJX430B used for?
The EJX430B is a wireless gauge pressure transmitter used for industrial pressure measurement. It is suitable for liquid, gas, and steam applications and can transmit process values and device setting parameters through an ISA100.11a wireless network.
What is the difference between gauge pressure and absolute pressure?
Gauge pressure is measured relative to atmospheric pressure.
Absolute pressure is measured relative to a vacuum reference.
For example, when atmospheric pressure changes, a gauge pressure measurement references that atmosphere, while an absolute pressure measurement does not.
What is the difference between EJX430B and EJX310B?
The main difference is the pressure reference.
EJX430B measures gauge pressure, while EJX310B measures absolute pressure.
Both models belong to Yokogawa's EJX-B wireless transmitter series and use ISA100.11a wireless communication, but the correct choice depends on whether the application requires an atmospheric or vacuum reference.
Is the EJX430B completely wireless?
The transmitter communicates wirelessly using ISA100.11a and can operate using its internal battery system.
However, the complete measurement system still requires compatible wireless infrastructure and appropriate network configuration.
How fast can the EJX430B update its measurement?
The measured process value can be published wirelessly at selectable intervals from 0.5 second to 60 minutes.
Does the EJX430B require signal cables?
The EJX430B does not require conventional hard-wired signal communication between the transmitter and the wireless network infrastructure.
This can help reduce installation costs and simplify projects involving remote or difficult-to-wire measurement points.
What is ISA100.11a?
ISA100.11a is an industrial wireless communication standard used in process automation.
The EJX430B uses this protocol to transmit process information and device parameters through a wireless network.
What pressure ranges are available?
The EJX430B offers multiple measurement capsules, covering gauge pressure spans from 2.5–500 kPa up to 0.08–16 MPa, depending on the selected capsule.
Can the EJX430B be used for plant retrofit projects?
Yes. The wireless architecture is particularly useful when new measurement points need to be added without installing long runs of conventional signal cable.
This can make the EJX430B a practical option for plant expansion, retrofit, and distributed monitoring projects.
Can the EJX430B measure gas or steam pressure?
Yes. Yokogawa specifies the EJX430B for applications involving liquids, gases, and steam. The final transmitter configuration should be selected according to the required pressure range, process connection, wetted materials, and site requirements.
What is the difference between EJX430B and EJX530B?
Both are wireless gauge pressure transmitters, but their mounting configurations differ.
The EJX430B is the traditional-mount configuration, while the EJX530B is the in-line mount configuration. The appropriate model depends primarily on the required process connection and installation arrangement.
Why choose the EJX430B instead of a conventional wired pressure transmitter?
The main advantage is installation flexibility.
By combining battery-powered operation with ISA100.11a wireless communication, the EJX430B can reduce the need for conventional signal wiring, making it useful for remote locations, retrofit projects, and additional measurement points where cable installation would increase project cost and complexity.
