The Masoneilan 12400 is a torque-tube displacer level transmitter with integrated smart electronics. It measures level, interface or density in process vessels using the classic displacer principle. Many refineries and chemical plants still rely on it for high-pressure, high-temperature services because the torque tube keeps the electronics out of the process and the sensor handles dirty, viscous or corrosive media reliably.

• Torque-tube design – no seals in the process
• Smart HART electronics for configuration and diagnostics
• Local indicator and push-button calibration
• Wide range of displacer materials (316L, Hastelloy, Monel)
• Interface and density measurement capability
• Robust construction for demanding services

• Measurement Range: 356 mm to 3048 mm (14" to 120")
• Process Pressure: Up to ANSI Class 2500 / PN 400
• Process Temperature: -196 °C to +400 °C
• Accuracy: ±0.5% of span typical
• Output: 4–20 mA HART
• Materials: Carbon steel, 316L stainless steel, Hastelloy C, Monel
• Approvals: ATEX, IECEx, FM, CSA

• Crude column boot level
• Vacuum column level
• Interface in separators
• Density measurement
• High-pressure/temperature vessels

Q: Is the 12400 still supported?

A: Yes, new units and spare parts are available.

Q: Can it replace older 12200/12300 models?

A: Yes – direct replacement with same mounting pattern.

• 12410 – external cage version
• 12800 – pneumatic controller
• LevelWave guided wave radar