Yokogawa EJA118W, EJA118N, and EJA118Y diaphragm-sealed differential pressure transmitters
The sealed diaphragm is used to prevent the medium in the pipeline from directly entering the pressure sensor component of the differential pressure transmitter. It is connected to the transmitter via a capillary tube filled with fluid. The Yokogawa EJA118W/118N/118Y diaphragm-sealed differential pressure transmitters are used to measure the flow, level, density, and pressure of gases, liquids, and steam, and then convert these measurements into a 4-20mADC current signal output. The EJA118W, EJA118N, and EJA118Y can also communicate with each other through the BRAIN handheld operator or CENTUM CS/μXL or HART275 handheld operator for settings and monitoring.
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Pressure transmitter
Yokogawa EJA Transmitter
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Detailed introduction
1. Product Overview:The sealed diaphragm is used to prevent the medium in the pipeline from directly entering the pressure sensor component of the differential pressure transmitter. It is connected to the transmitter via a capillary tube filled with fluid. The Yokogawa EJA118W/118N/118Y diaphragm-sealed differential pressure transmitter is used to measure the flow, liquid level, density, and pressure of gases, liquids, and steam, and then converts these measurements into a 4-20mADC current signal output. EJA118W, EJA118N, and EJA118Y can also communicate with each other through the BRAIN handheld device or CENTUM CS/μXL or HART275 handheld device for settings and monitoring.
Here are the key features of the Yokogawa EJA118 series diaphragm-sealed differential pressure transmitters, particularly the EJA118E model:
🌟 Core Performance
±0.2% Accuracy (±0.04% for EJA118E)
200 ms Response Time
Dynamic Compensation for temperature and static pressure effects
10-segment Signal Characterizer for custom output curves
🧠 Smart Capabilities
DPharp Digital Sensor: Delivers superior stability and diagnostics compared to analog sensors
Local Parameter Setting (LPS): Configure without a handheld communicator
HART Protocol: Standard digital communication for integration
🛡️ Robust Design
SIL2/SIL3 Certified (Exida and TÜV) for safety-critical applications
IP66/IP67 Protection: Dust-tight and water-resistant
Wide Operating Range: -40°C to 85°C (amplifier), up to 120°C (capsule)
Corrosion-resistant Wetted Parts: Typically stainless steel or Hastelloy
🧪 Application Flexibility
Flush, Extended, or Mixed Diaphragm Seals: W, N, and Y variants for different process needs
Rangeability: Up to 40:1 (M capsule)
Capillary Fill Fluid Density Compensation: Enhances accuracy in remote seal setups
2. Product Specifications:
| Parameter | Specification |
|---|---|
| Model Variants | EJA118W (Flush/Flush), EJA118N (Extended/Extended), EJA118Y (Extended/Flush) |
| Measurement Type | Differential Pressure with Remote Diaphragm Seals |
| Sensor Type | DPharp Digital Resonant Sensor |
| Accuracy | ±0.04% of span (standard), ±0.2% for older models |
| Response Time | 200 ms (EJA118E), 700 ms (legacy models) |
| Rangeability (Turndown) | Up to 40:1 (M capsule) |
| Output Signal | 4–20 mA DC with HART (standard) |
| Power Supply | 10.5–42 V DC (HART) |
| Process Temperature Range | Up to 120°C (with remote seal) |
| Ambient Temperature Range | -40°C to +85°C |
| Ingress Protection | IP66/IP67 |
| Safety Certifications | SIL2/SIL3 (via Exida and TÜV) |
| Mounting | 2-inch pipe or direct wall mount |
| Diaphragm Seal Types | Flush, Extended, or Mixed |
| Capillary Fill Fluid | Silicone oil, Fluorinated oil (for high-temp or chemical resistance) |
| Communication Protocols | HART (standard), BRAIN (optional on legacy units) |
| Zero Adjustment | External pushbutton or via communicator |
3. FAQ for the Yokogawa EJA118 series diaphragm-sealed differential pressure transmitters, tailored for technical users and specifiers:
🔧 General
Q: What is the EJA118 series used for?
A: It’s designed for differential pressure measurement in processes where direct connection isn’t feasible—typically involving high temperature, corrosive, or viscous media. Remote diaphragm seals isolate the transmitter from the process.
Q: What are the differences between EJA118W, EJA118N, and EJA118Y?
A:
EJA118W: Flush-type seals on both sides
EJA118N: Extended-type seals on both sides
EJA118Y: Extended on high-pressure side, flush on low-pressure side
⚙️ Technical
Q: What is the accuracy of the EJA118E model?
A: ±0.04% of span (standard). Older models like EJA118W/N/Y offer ±0.2%.
Q: What is the response time?
A: 200 ms for EJA118E; 700 ms for legacy models.
Q: What communication protocols are supported?
A: HART is standard. BRAIN protocol is available on older models.
Q: What is the maximum process temperature?
A: Up to 120°C with remote seal configurations.
🛡️ Installation & Safety
Q: Is the EJA118 SIL certified?
A: Yes, SIL2/SIL3 certified by Exida and TÜV for safety instrumented systems.
Q: Can I adjust zero externally?
A: Yes, via an external pushbutton or handheld communicator.
Q: What are the mounting options?
A: 2-inch pipe or direct wall mounting.
📘 Documentation & Support
Q: Where can I find the user manual?
A: You can download it from .
Q: Is the EJA118 still available?
A: No, it was discontinued in 2016. Recommended replacements include the EJA118E, EJXC80A, and EJAC80E series.
Friendly reminder:Due to the complex selection parameters of the Yokogawa EJA118W/118N/118Y diaphragm-sealed differential pressure transmitter, if you would like specific product selection and model pricing, please feel free to consult online.
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