Masoneilan 12400 Series Digital Level Transmitter/Controller
Overview
The Masoneilan 12400 Series is a digital level transmitter and controller from Baker Hughes that measures liquid level or interface level in a vessel or chamber with the proven displacer and torque tube principle. Baker Hughes calls it the first torque tube level instrument to integrate level transmitter, controller and switch functions in a single device. It is a two-wire, loop-powered instrument with HART communication and an optional 4-20 mA analogue output, and it is available in a SIL2-capable version for the transmitter function. For plants that already rely on displacer level instruments, it brings digital calibration, diagnostics and integrated alarms without changing the measuring principle.
Seven Star LLC is a trusted supplier for Masoneilan and supplies the Masoneilan 12400 Series to refineries, gas plants and petrochemical complexes across the Sultanate of Oman and the GCC. Because the model code defines the mounting, connections, hazardous area approval and housing material, our instrumentation team in Muscat reviews each vessel connection and process condition with the customer, and provides the Baker Hughes brochure so that engineers can check performance and approvals before ordering.
Measurement Principle of the Masoneilan 12400 Series
The Masoneilan 12400 Series applies buoyancy. A displacer is suspended in a chamber, or inside the vessel, and a change in liquid level changes the net weight of the displacer, which changes the load on the torque tube in proportion to the level. The resulting rotation of the torque rod moves a magnet assembly and alters the magnetic field around a non-contact sensor, producing an analogue signal proportional to level. This signal is converted into an error-free digital signal, processed by the on-board micro-controller and converted to a 4-20 mA output.
Because the sensor is non-contacting and frictionless, there is total isolation between the sensed motion and the sensor output, and Baker Hughes quotes a measurement resolution of 0.1 percent. Smart filtering reduces unwanted oscillations without slowing the response, and inside a chamber surface turbulence and foam do not impede the displacer. The same principle supports interface measurement between two liquids, and the instrument can calculate specific gravity when the displacer is fully immersed.
Engineering Design of the Masoneilan 12400 Series
The instrument head of the Masoneilan 12400 is an aluminium housing with epoxy paint, or stainless steel, with a window for an LCD that shows the level in seven languages, three explosion-proof pushbuttons for local configuration and a bargraph for self-diagnostics. It connects to the torque tube through a coupling, and a patented sensor bias sub-assembly forces the sensor into a repeatable failsafe position when a loose or incorrect coupling is detected. This diagnostic covers the whole measurement chain from displacer to analogue output, which is the reason the SIL2 analysis can include the complete transmitter and reach a safe failure fraction above 90 percent.
The mechanical arrangement is chosen by the model code. Chamber versions can be connected top and bottom, side and side, top and side or side and bottom, with screwed, butt-weld, socket-weld or flanged connections of 1 1/2 or 2 inch (DN 40 and DN 50), while internal versions bolt the mechanism chamber flange directly to the vessel flange. Standard ranges run from 356 mm (14 inches) to 3,048 mm (120 inches), pressure ratings run from ANSI class 150 to 2500 and PN 10 to PN 420, and body, displacer and torque tube materials include carbon steel, stainless steel, chrome-moly and Inconel. Process temperature limits are -210 to +450 degrees Celsius with an extension above 150 degrees Celsius or below -100 degrees Celsius.
Key Features
The following capabilities distinguish the Masoneilan 12400 Series from conventional pneumatic or analogue displacer instruments:
- Transmitter, PID controller and level switch functions in one device, with two built-in solid-state switches rated 1 A at 30 V DC.
- HART communication with an optional second 4-20 mA output, and a low 10 V DC compliance for legacy and wireless HART loops.
- SIL2 capability for the transmitter function, certified to IEC 61508 by exida, with a safe failure fraction above 90 percent.
- Calibration with or without fluid, including liquids of unknown specific gravity, using pushbuttons or HART.
- Level, interface and specific gravity measurement, with specific gravity range 0.15 to 1.4 for a standard displacer.
- Accuracy of 0.1 percent for the instrument head alone and 0.5 percent with the torque tube assembly.
- Continuous data recording of fillings, high and low level time and working time, stored in non-volatile memory.
- Field-upgradeable flash firmware, and integration through ValVue, DTM, eDDL and AMS or PRM plug-ins.
Industrial Applications
Baker Hughes lists the Masoneilan 12400 Series for refining and petrochemicals, with typical applications in distillation, hydroprocessing, reforming, cracking, secondary processes, blending, quenching, fractionation, charge gas compression and separation. The torque tube principle handles high temperature, high pressure and NACE service, which suits it to demanding vessel level duties. In Oman, such duties are found in the refinery and gas processing units around Sohar and Duqm and in the oil and gas fields inland.
In Oman and the GCC, Seven Star LLC supplies the Masoneilan 12400 Series together with the control valves and positioners that close the level loop. A level controller that sets the valve directly is often paired with a valve such as the Masoneilan 41005 cage-guided control valve or the Masoneilan 10000 double-port control valve, driven by a positioner such as the Masoneilan SVI3 digital valve positioner. We review the vessel connection, specific gravity, temperature and area classification before quoting the Masoneilan 12400 Series.
Technical Specifications
The table summarises the published data for the Masoneilan 12400 Series from the Baker Hughes brochure. Performance figures apply at room temperature with a standard displacer and specific gravity between 0.15 and 1.4.
| Parameter | Specification |
|---|---|
| Model | Masoneilan 12400 Series digital level transmitter/controller (models 12400 to 12409) |
| Function | Level or interface transmitter; level controller with PID; level switches |
| Output | 4-20 mA, two-wire, loop powered, NAMUR NE 43; optional second 4-20 mA output |
| Communication | HART version 5; ValVue, DTM, eDDL, handheld communicators |
| Supply voltage | 10 to 30 V DC (intrinsically safe) |
| Accuracy | 0.1 percent of full span (head alone); 0.5 percent with torque tube assembly |
| Hysteresis and dead zone | 0.1 percent (head alone); 0.3 percent with torque tube assembly |
| Repeatability | 0.1 percent (head alone); 0.2 percent with torque tube assembly |
| Measuring ranges | 356, 610, 813, 1,219, 1,524, 1,829, 2,134, 2,438 and 3,048 mm; others on request |
| Pressure rating | ANSI class 150 to 2500; PN 10 to PN 420 |
| Process temperature | -210 to +450 degC with extension above 150 degC and below -100 degC |
| Ambient temperature | -40 to +80 degC standard; -50 to +85 degC extended |
| Safety | SIL2 capable (transmitter function only), IEC 61508 |
| Approvals | ATEX and IECEx Ex db and Ex ia; FM and FMc; CU TR, JIS, Inmetro and others |
| Enclosure | IP66/IP67, NEMA 4X-6P; aluminium with epoxy paint or stainless steel |
Related Masoneilan level instruments and valves include the Masoneilan 12800 Series pneumatic level controller, Masoneilan 21000 Series top-guided globe valve and Masoneilan 75000 Series tank drain valve.
Request a Quote for Masoneilan 12400
To request pricing or technical support for the Masoneilan 12400 Series, send a formal RFQ to the Seven Star LLC instrumentation division with the vessel connection, measuring range, specific gravity or interface data, process temperature and pressure, and the hazardous area approval you require. We can confirm the correct model code, advise on availability and lead time and provide the Baker Hughes brochure from this page. In Oman and the GCC, Seven Star LLC delivers genuine products with manufacturer documentation and local engineering support.
- Brochure Masoneilan 12400 Series Digital Level Transmitter Brochure Download
Masoneilan control valves and actuator series
The globe valve listing centers on the 21000 series, including the cryogenic version with extension bonnet, and the 41005 cage-guided series in high pressure, API 6A and VRT anti-cavitation executions. The 80385 and 80386 are three-way combining and diverting valves. Rotary products include the 35002 Camflex II and the 37002 MiniTork II butterfly control valve. Actuators cover spring-diaphragm, cylinder and rack-and-pinion designs, among them the 5A cylinder actuator for Camflex II. Masoneilan also makes pressure regulators, SVI digital valve positioners and displacer-type level instruments, and offers Lo-dB trim for noise control.Where Masoneilan valves are used
Throttling duty on steam, hydrocarbons, gas and water is the daily work of these valves: feedwater and steam conditioning in power plants, separator and compressor loops in gas processing, high pressure drop letdown, cryogenic service in LNG and air separation, and general flow, pressure and level control in refineries and chemical plants.Ordering Masoneilan valves and spare parts: what we need
For spare parts the serial number is decisive, since the factory record behind it lists trim, materials and actuator. Send a clear nameplate photo with serial number, model number, size and pressure class. For a new valve add the process data: fluid, inlet and outlet pressure, temperature, minimum, normal and maximum flow, required leakage class, fail position, air supply and control signal.Browse Masoneilan products by category: Control Valves, Valve Actuator, Regulators, Valve Positioner, Level Transmitter.
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