Nguồn gốc:
Trung Quốc
Hàng hiệu:
Yokogawa
Số mô hình:
EJX438A
EJX438A Gauge Pressure Transmitter with Remote Diaphragm Seal – Introduction
The Yokogawa EJX438A is a high-performance gauge pressure transmitter designed for industrial applications that require the use of a remote diaphragm seal. It belongs to Yokogawa’s premium EJX-A series, which uses the company’s advanced DPharp digital sensor technology for superior accuracy, long-term stability, and reliability.
By using a remote diaphragm seal, the transmitter isolates the process fluid from the pressure sensor through a diaphragm and fill fluid system. This makes the EJX438A ideal for processes involving corrosive, abrasive, high-temperature, viscous, or sanitary fluids, or wherever direct contact between the sensor and the medium is not acceptable.
Key Features
High Measurement Performance
Advanced DPharp Digital Sensor
Remote Diaphragm Seal System
Output and Communication Options
Industrial Robustness and Safety
Typical Applications
The EJX438A is widely used in industries such as:
Typical use cases include:
Product Status
The EJX438A has been discontinued by Yokogawa (effective late 2024).
Recommended successor models include:
These new models provide improved performance and updated diaphragm-seal configurations.
|
Parameter / Feature |
EJX438A (Gauge + Remote Diaphragm Seal) |
|
Measurement type |
Gauge pressure (relative pressure) |
|
Accuracy (Reference) |
± 0.15 % of span |
|
Response time |
≈ 200 ms |
|
Rangeability (Turndown) |
Up to 100:1 |
|
Pressure (Span) Ranges |
Example spans: 0.035–3.5 MPa and 0.16–16 MPa (depending on seal / configuration) |
|
Output Signal / Communication Options |
4–20 mA DC + optional digital communication (e.g. HART, BRAIN, FOUNDATION Fieldbus, PROFIBUS PA) |
|
Remote Diaphragm Seal + Capillary System |
Yes — isolates process fluid; pressure is transmitted via fill fluid in capillary/seal to sensor. Useful for corrosive, abrasive, high-temperature or contaminant-sensitive fluids. |
|
Diagnostics & Advanced Sensor |
Uses “DPharp” digital active sensor with self-check/diagnostic capabilities; can detect issues such as impulse-line blockage. |
|
Safety / Functional Safety |
Certified by TÜV / Exida; suitable for SIL 2 (single transmitter) and SIL 3 (redundant configuration) per IEC 61508 / IEC 61511. |
|
Process fluid compatibility |
Liquids, gases, or steam — enabled by remote diaphragm seal. |
|
Status |
Discontinued (since 30 September 2024) — manufacturer recommends replacing with newer models (e.g. EJXC80A, EJAC80E) for new projects. |
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