For the Sanmen Nuclear Power Plant Unit 3, containment pressure monitoring is classified as 1E (nuclear safety grade), requiring precise pressure measurement under accident conditions. This has long relied on imported equipment.

• High temperature, high pressure, and high radiation levels (up to 10⁵ Gy);
• Numerous containment penetrations with long capillary tubing, making filling difficult;
• Imported equipment is expensive, has long lead times, and limited maintenance support.

CGN Auto Instrumentation JE52 1E-Class Pressure/Differential Pressure Transmitter (first domestically produced set), featuring a split design, capillary tube filling, and radiation-resistant construction.

• Successful one-time field filling achieved, with accuracy of ±0.1%, meeting 1E-class requirements;
• Broke foreign monopoly, reducing equipment cost by 50% and shortening delivery time by 70%;
• Provided critical validation for future localization efforts in projects such as "Hualong One."