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Masoneilan 12400 is a torque-tube displacer type level transmitter with integrated smart electronics and HART communication. It has been a workhorse in refineries and petrochemical plants for decades, especially for measuring level in crude columns, vacuum towers, and high-pressure separators. The torque-tube design keeps the electronics isolated from the process, making it very reliable in dirty, viscous, or corrosive services.
Features
Torque-tube transmission – no moving seals on process side
Smart HART electronics with local display and push-button calibration
Capable of level, interface, and density measurement (multi-displacer setups)
Wide selection of displacer materials (316L, Hastelloy C, Monel)
Broad temperature and pressure range for severe service
Simple local zero/span adjustment
Strong resistance to fouling and corrosion
Technical Specifications
Measuring 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
Body Materials: Carbon steel, 316L stainless steel, Hastelloy C, Monel
Displacer Materials: 316L, Hastelloy C, Monel
Approvals: ATEX, IECEx, FM, CSA (hazardous area certifications)
Applications
Crude column boot level
Vacuum tower level
High-pressure separator interface
Density measurement
Severe service vessels (high temp/high pressure)
FAQ
Q: Is the 12400 still in production?
A: Yes – new units and spare parts are still available.
Q: Can it replace older 12200 or 12300 models?
A: Yes – mounting dimensions and interfaces are compatible for direct replacement.