Rosemount 2051 Pressure Transmitter
Overview
The Rosemount 2051 is Emerson’s coplanar pressure transmitter platform for differential, gage and absolute pressure measurement. The official product data sheet describes it as the foundation of reliable measurement, with an extensive offering of integrated differential pressure flow meters, liquid level assemblies, instrument manifolds and flanges built on the same transmitter. Accuracy reaches 0.05 percent of span with the high accuracy option, and the platform is available in 4 to 20 mA HART, FOUNDATION Fieldbus, PROFIBUS PA and WirelessHART protocols, with SIL 2/3 certification available on the full 4 to 20 mA HART offering.
As a supplier of Rosemount products in Oman and the GCC, Seven Star LLC supplies the Rosemount 2051 Pressure Transmitter with the Rosemount 2051 datasheet and regional technical backing. Plants in Muscat, Sohar and Salalah can specify the transmitter alone or combined with a manifold, a 1199 diaphragm seal or a primary flow element and receive a correctly assembled unit.
Measurement Principle
The Rosemount 2051 senses pressure through isolating diaphragms that transmit process pressure to a fill-fluid-filled sensor. In the coplanar design, the high and low side process connections lie in the same plane, which allows direct mounting to manifolds, seals and primary elements. Differential versions compare two pressures and are used for flow and level inference, while gage and absolute versions compare the process to atmosphere or to a vacuum reference. The sensor signal is digitized and corrected in the electronics, which then drive the analog output or the digital protocol and update the reading 22 times per second.
The range structure of the Rosemount 2051C runs from range 1, covering –25 to 25 inH2O (–62.2 to 62.2 mbar), to range 5 at –2000 to 2000 psi (–137.9 to 137.9 bar). In-line 2051T and 2051G versions cover ranges up to 10,000 psi (689.5 bar) on the 2051T. Total response time is 100 ms on the in-line models and 115 to 270 ms on the coplanar models for HART, and users can add damping from 0 to 60 seconds for one time constant on the analog output.
Engineering Design of the Rosemount 2051
Transmitter flanges are available in plated carbon steel, stainless steel and alloy C-276, with 316L stainless steel, alloy C-276, tantalum or gold-plated 316L diaphragms and glass-filled or graphite-filled PTFE O-rings. Silicone or inert sensor fill fluids are offered. Housings come in aluminum, ultra low copper aluminum and stainless steel with ½-14 NPT, M20 or G½ conduit entries, and the wireless version uses an engineered polymer housing. The stated ambient limits are –40 to 85 °C, or –40 to 80 °C with an LCD display, and the unit requires 10.5 to 42.4 Vdc on the wired versions.
The design also supports factory assembly. Option codes allow the Rosemount 2051 to be delivered assembled to a Rosemount 305 integral manifold, a 304 manifold, a 405 compact orifice plate, an Annubar averaging pitot tube, a 1195 integral orifice or one or two 1199 seals. Newly shipped devices carry a QR code asset tag that opens serialized drawings, diagrams and troubleshooting information in a MyEmerson account, which shortens repair time and removes the need to transcribe nameplates.
Key Features
The Rosemount 2051 packs several capabilities into one transmitter family. The points below are taken from the official data sheet.
- Delivers reference accuracy up to 0.05 percent of span on 2051C ranges 2 to 4 with the P8 high accuracy option.
- Offers selectable HART Revision 5 and 7, FOUNDATION Fieldbus, PROFIBUS PA and 2.4 GHz WirelessHART output options.
- Includes a local operator interface with menus and built-in buttons to speed up configuration at the transmitter.
- Provides SIL 2/3 certification to IEC 61508 with the full 4 to 20 mA HART offering and prior-use FMEDA data.
- Withstands overpressure up to 3,626 psig (250 bar) on coplanar ranges 2 to 5, or 4,500 psig (310.3 bar) with option P9.
- Supports integrated flow meters that reach up to 2 percent of flow rate at 5:1 turndown with the Annubar version.
- Uses an intrinsically safe lithium power module on the wireless version, with a stated life of ten years at a one minute update rate.
- Meets EN 61326 and NAMUR NE-21 and offers optional transient protection with option code T1.
Industrial Applications
The Rosemount 2051 is a general-purpose workhorse for liquid, gas and vapor service. Typical applications include tank and vessel pressure, filter and strainer differential pressure, orifice-based flow measurement, hydrostatic level in open and closed tanks, and pump and compressor monitoring. The 2051CF integrated flow meters arrive fully assembled and leak tested, reducing straight pipe requirements and permanent pressure loss in small line sizes, while the 2051L level transmitter connects to virtually any process through flanged diaphragms and capillary systems. In Oman these jobs occur across oil and gas production, desalination, power and water utilities and the process industries near Sohar and Salalah.
In Oman and the GCC, Seven Star LLC supplies the Rosemount 2051 to operators, EPC contractors and instrumentation maintenance teams across Oman and the wider GCC. For higher-end pressure and level options, review the Rosemount 3051 Coplanar pressure transmitter, the Rosemount 2088 gauge and absolute pressure transmitter and the Rosemount 3051SAL liquid level transmitter.
Technical Specifications
The table summarizes published Rosemount 2051 specifications from the Emerson product data sheet dated March 2026.
| Parameter | Specification |
|---|---|
| Model | Rosemount 2051 (2051C coplanar, 2051T and 2051G in-line, 2051CF flow, 2051L level) |
| Measurement type | Differential, gage and absolute pressure |
| 2051C ranges | Range 1: –25 to 25 inH2O; range 5: –2000 to 2000 psi (differential) |
| 2051T ranges | Range 0: 5 psi upper limit; range 5: 10,000 psi upper limit |
| Reference accuracy | Up to ±0.05% of span (P8 option); standard ±0.065% of span on ranges 2 to 4 |
| Output protocols | 4–20 mA HART (Rev 5/7), FOUNDATION Fieldbus, PROFIBUS PA, WirelessHART |
| Power supply (wired) | 10.5 to 42.4 Vdc |
| Update rate | 22 times per second (wired) |
| Overpressure (2051C) | 3,626 psig; 4,500 psig with option P9 |
| Ambient temperature | –40 to 85 °C (–40 to 80 °C with LCD) |
| Process temperature (coplanar, silicone) | –40 to 121 °C |
| Electrical connections | ½-14 NPT, G½ and M20 × 1.5 |
| Safety | SIL 2/3 per IEC 61508 (HART output) |
Request a Quote for Rosemount 2051
Request a formal quotation for the Rosemount 2051 Pressure Transmitter from Seven Star LLC. Send us the pressure range, measurement type, output protocol, flange and diaphragm material, hazardous area approval and any manifold, seal or flow element you need, and our instrumentation division will return a valid model code with lead time. We can share the Rosemount 2051 datasheet and confirm availability and lead time. In Oman and the GCC, Seven Star LLC supplies transmitters on request with the local support that critical pressure, flow and level points require.
- Datasheet Emerson Rosemount 2051 Pressure Transmitter Product Data Sheet 00813-0100-4101, Rev RG, March 2026 Download
Rosemount product families on this page
Pressure includes the 3051 in its variants (3051T in-line, 3051L for liquid level, 3051CF DP flowmeter and the 3051SMV MultiVariable transmitter), the 2051 and 1199 diaphragm seal systems. Level instruments are the 3300 guided wave radar, the 5408 non-contacting radar and the 2120 vibrating fork switch. Temperature is covered by the 248 and 644 head mount transmitters and the 848T high density transmitter for multiple sensor inputs. The 8800D vortex flowmeter and the 702 wireless discrete transmitter are also listed, along with liquid analysis sensors.Where Rosemount instruments are used
These are standard instruments in oil and gas production, refining, petrochemical, power and water plants. Typical duties are line and vessel pressure, differential pressure flow across orifice plates, tank and separator level and interface, and temperature measurement on pipes, reactors and rotating equipment.Ordering Rosemount transmitters: what we need
Send the complete model string and the serial number from the nameplate; a photo is ideal. Every character of the string selects something: range, output, materials of the isolating diaphragm and flange, process connection, housing, approval and options. If you are specifying a new point, give the measured variable and span, process fluid, pressure and temperature, connection, output (4-20 mA HART, FOUNDATION Fieldbus or wireless), display and hazardous area approval. For remote seals add flange size, rating and capillary length.Browse Rosemount products by category: Pressure Instrumentation, Temperature Instrumentation, Level Transmitter, Liquid Analysis Sensors, Flowmeters.
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