1. Product Overview:The Yokogawa EJA440A high static pressure transmitter uses a world-first single crystal silicon dual-resonance sensor, which operates using electromagnetic excitation and electromagnetic vibration pickup. The output is a frequency signal, with strong anti-interference capability and good stability, eliminating the need for A/D conversion. It can measure both absolute pressure and differential pressure, with an accuracy of ±0.075%. The Yokogawa EJA440A series intelligent transmitters are suitable for pressure measurement in special environments such as aviation, aerospace, meteorology, geology, navigation, oil wells, and industrial automation. 
The Yokogawa EJA440A high static pressure transmitter can also be zeroed at any point within the upper and lower limits of the diaphragm. The output is a 2-wire system, with the option to select linear or square root output mode, and BRAIN or HART FSK protocol loaded on the 4~20mA DC signal. The output mode and display mode are set to 'Linear' by default unless otherwise specified. 

Here are the key features of the Yokogawa EJA440A High Gauge Pressure Transmitter:

🛠️ Core Performance

Gauge Pressure Measurement: Measures high-pressure gases and liquids with exceptional stability.

Span Limit: 0.2 to 10,000 psi, depending on the capsule

Maximum Working Pressure: Up to 8,500 psi, ideal for heavy-duty industrial environments

Accuracy: ±0.12% of span (optional ±0.04% available with advanced options)

Stability: ±0.1% of URL for 5 years

💡 Technology

DPharp Sensor: Digital resonant sensor improves signal fidelity and self-diagnostics

Output Signal: 4–20 mA DC with HART® communication

Response Time: 90 ms (typical), ensuring quick system feedback

Power Supply: 10.5 to 42 V DC (Terminal Voltage)

⚙️ Construction & Reliability

Mounting Type: Traditional flange-mount design

Process Connections: 1/2" NPT female, with optional flanges and manifolds

Material Options: Stainless steel, Hastelloy C, or other high-grade corrosion-resistant alloys

Ingress Protection: IP66/IP67 and NEMA 4X certified

🧠 Diagnostics & Certifications

Self-Diagnostics: Detects sensor abnormalities, overpressure, temperature drift

Certifications: Explosion-proof, flameproof, and intrinsically safe for global markets

2. Product Parameters and Specifications: 
 

Selection table and basic specification code for EJA440A high static pressure transmitter: EJA440A-DCS5A-92NN

Frequently Asked Questions – Yokogawa EJA440A

Q1: What type of pressure does the EJA440A measure? 

A: It measures gauge pressure, suitable for high-pressure gas and liquid applications.

Q2: What is the maximum working pressure? 

A: The transmitter can handle up to 8,500 psi, depending on the capsule configuration.

Q3: What is the accuracy of the EJA440A? 

A: Standard accuracy is ±0.12% of span, with an optional upgrade to ±0.04%.

Q4: Is the EJA440A still available? 

A: No, it was discontinued on December 29, 2016. The recommended replacement is the EJA440E.

Q5: What communication protocol does it support? 

A: It uses 4–20 mA DC with HART® protocol for digital communication and diagnostics.

Q6: What sensor technology does it use? 

A: It features Yokogawa’s DPharp digital resonant sensor, known for stability and self-diagnostics.

Q7: What certifications are available? 

A: It supports explosion-proof, intrinsically safe, and flameproof certifications for global use.

Q8: Can it be used in harsh environments? 

A: Yes, with IP66/IP67 and NEMA 4X ingress protection and corrosion-resistant materials like Hastelloy C.

Note 1: Material of body chamber flange and process joint: 
C membrane box: The chamber flange is SU5316, and the process connection head is SCS14A. 
D membrane box: The chamber flange is made of SUS316, and the process connection head is made of SUS316. 
Note 2: The material of the diaphragm is Hastelloy C-276 or ASTM N10276, and the material of the remaining liquid receiving parts is SUS316L. 
Note 3: If necessary, installation brackets C, D, or K can be specified. Note 4: If necessary, installation brackets A, B or] can be specified. 
Note 5: Not applicable to D film box. Note 6: The lower limit of the liquid contact temperature for the ambient temperature of the C membrane box is -15 ° C. 
Note 7: Not applicable to output signal codes F and G. 
Inappropriate village quality may lead to unexpected leakage of corrosive media, which can cause serious damage to the human body and factory equipment. Note 8: Users must consider the characteristics of the village quality and the corrosiveness of the media in the liquid receiving part, resulting in serious damage to the document. When selecting, attention must be paid to the presence of strong corrosion media such as hydrochloric acid and sulfuric acid H25、 Please contact the marketing department when dealing with high temperature steam such as sodium hypochlorite or 150 ° C or above.