Rosemount 1151 Fully Discontinued, Upgrade to Original 3051 Pressure Transmitter

Rosemount 1151 is a legendary legacy transmitter with over 8 million units installed worldwide, trusted by petrochemical, power and chemical plants for decades due to solid Rosemount original quality.

However, Emerson has officially discontinued the entire 1151 product line permanently. No brand-new original factory units are available any longer. Only refurbished used stock, leftover inventory and third-party copies are circulating on the market, bringing hidden risks:

1. No official factory warranty, spare parts supply shrinking year by year;

2. Outdated circuit design without intelligent sensor diagnostic functions;

3. Limited accuracy & turndown ratio, high long-term maintenance cost.

As the official upgraded successor, Rosemount 3051 series inherits all premium production standards of Rosemount, with fully upgraded performance, sufficient original stock and complete factory warranty.

1. Original factory precision, quality consistently inherited

Both the 1151 and 3051 are originally designed by Rosemount in the United States and manufactured on standardized precision production lines, undergoing uniform, rigorous factory calibration, explosion-proof testing, and EMC electromagnetic compatibility testing, maintaining the brand's decades-long reputation for reliability and durability. The 3051 features a new-generation coplanar platform packaging technology, with IP67 waterproof and dustproof protection, offering superior resistance to vibration and corrosion compared to the older 1151 model.

2. Performance significantly exceeds that of 1151, reducing operational and maintenance costs

• Accuracy: 1151 standard at 0.075% FS, 3051 up to 0.025% FS, significantly reducing measurement error;

• Long-term stability: 1151 offers only a 2-year stability guarantee, while 3051 supports 10 years of factory stability, reducing the frequency of annual calibration.

• Range ratio: 1151 up to 50:1, 3051 up to 150:1, allowing a single transmitter to cover multiple range segments and reducing spare parts inventory;

• Sensor technology: Next-generation silicon capacitive sensing with reduced temperature drift, enabling more stable measurements under high and low temperature conditions.

3. Intelligent diagnostic function, completely absent in the older 1151 model

The 3051 is equipped with an original intelligent monitoring system that can detect in real time blockages in the pressure lead lines, loop faults, and sensor drift, providing early warnings of potential issues to prevent unplanned shutdowns. It supports HART 7 and Bluetooth local configuration, enabling easier commissioning with a TREX handheld operator. In contrast, the older 1151 analog circuit lacks any self-diagnostic capability for faults.

4. Complete safety certifications, suitable for explosion-proof SIL environments

All models come standard with SIL2/SIL3 functional safety certification, and are fully equipped with ATEX, IECEx, and national explosion-proof (intrinsically safe/explosion-proof) certifications. Some older 1151 model types lack complete SIL certification; therefore, upgrading outdated safety circuits requires replacing them with the 3051 to meet current safety standards.

5. Compatible installation, low-cost replacement for existing 1151 devices

The standard three-valve assembly, flanges, and mounting brackets are compatible with existing 1151 installation points, providing adapter components that eliminate the need for extensive pipeline cutting or hot work modifications. It supports multiple applications including differential pressure, gauge pressure, absolute pressure, and level measurement, offering a complete replacement for the entire 1151DP/GP/AP/HP series.

Q1: Why can 1151 still be found on the market, yet you only recommend 3051?

A: The Rosemount 1151 has been completely discontinued by the original manufacturer. Currently available on the market are only refurbished, disassembled units or leftover inventory-there are no new factory-built models, nor any official long-term after-sales service. The 3051 is the officially designated successor model by Emerson, fully inheriting Rosemount's rigorous quality standards while offering upgraded performance, longevity, and safety. With stable supply and comprehensive warranty, it is the optimal choice for ensuring long-term, reliable operation of your equipment.

Q2: The on-site drawing is labeled 1151. Will replacing it with 3051 require extensive modifications?

Ar: The 3051 comes with a compatible adapter valve assembly and mounting bracket, allowing direct in-place replacement of the existing 1151 without modifying the pressure lead lines. We can provide a selection guide matching 1151 models to 3051 equivalents, along with a corresponding retrofit technical solution to streamline the equipment change approval process.

Q3: Is the product quality of 3051 more reliable compared to the older 1151?

Ar: Both models are originally designed and manufactured by Rosemount, under a unified quality control system. The 3051 is an upgraded version that builds on the brand's precision manufacturing advantages, with optimized sensor, circuitry, and protective structures, offering significantly better stability and service life compared to the older 1151 model-proven by millions of units deployed worldwide.

Eliminate the risks associated with discontinued and outdated 1151 spare parts by choosing the original Rosemount 3051 transmitter. Built on the brand's consistent commitment to rigorous manufacturing standards, it offers higher accuracy, reduced maintenance, and extended service life. Suitable for petrochemical, power, chemical, new energy retrofitting, and new construction projects, we provide full model in-stock availability along with one-on-one support for selection, installation, and modification.