Masoneilan 12400 Series Digital Level Transmitter Displacer Industrial Level Measurement
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.
- 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
- 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)
- Crude column boot level
- Vacuum tower level
- High-pressure separator interface
- Density measurement
- Severe service vessels (high temp/high pressure)
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.
- 12410 – external cage mounted version
- 12800 – pneumatic level controller
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