You have come to the right place if you need to choose between two of Emerson's most reliable pressure sensors. Both the Rosemount 3051CD differential pressure transmitter and the 3051S work well, but they are designed to do different things. This guide breaks down exactly what makes them different, so you can make an informed purchase choice without any doubts.
The 3051CD can measure flow, level, and pressure drop with an accuracy of up to ±0.025% of span when the high-accuracy option is turned on. Up to 137.89 bar (2000 psi) of pressure difference won't hurt it. The 3051S is made for tasks that need even tighter performance limits. It shows an accuracy of ±0.025%, stays stable for five years, and can have a wider top range limit in some setups.
As standard, both transmitters can wet parts made of 316L stainless steel. For corrosive media, you can choose from Alloy C-276, Alloy 400, or Tantalum. Four-20 mA HART, WirelessHART, FOUNDATION Fieldbus, and PROFIBUS PA can be sent out by the 3051CD. The 3051S has similar output choices, but it is also made for better OEM integration, with more modular electronics that can be used in different or unique ways.
The Rosemount 3051CD differential pressure transmitter keeps ±0.1% of URL stability for a year, which makes it much less often that you need to re-calibrate. The 3051S can work in temperatures ranging from -40°F to +185°F (-40°C to +85°C). It also has a cold-temperature start-up mode for use in temperatures as low as -58°F (-50°C). Both models do a good job of compensating for temperature differences, but the 3051S has a few more temperature options for use in harsh environments.
The 3051CD's patented Coplanar technology positions all connections on a single plane, removing the measurement delays and error sources tied to traditional impulse line routing. This design reduces installation leak points by up to 70% compared to conventional setups. The 3051S uses a different sensing architecture with a modular platform that supports multi-variable measurement, which adds value where simultaneous pressure, temperature, and flow data collection matters.
Here are the core durability features that define both models in harsh-environment applications:
These material and certification options allow facilities in oil and gas, chemical processing, and water treatment to deploy either transmitter with confidence that long-term reliability will not be compromised by environmental exposure.
One of the most common problems in measuring differential pressure is an impulse line that gets blocked. There are built-in impulse line blockage detection and loop integrity tracking in the 3051CD that let you know about possible faults before they cause the process to shut down. The 3051S has similar diagnostics built into its modular platform, but it's especially useful when safety architecture calls for redundancy or logging of multiple variables of data.
The Rosemount 3051CD differential pressure transmitter works great when you need to put it in quickly, have a lot of rangedown options, and mount it directly on a flat surface. Because it has a 150:1 range-down ratio, you can use the same tool for a lot of different processes. In the oil and gas business, measuring pipeline flow is common. In HVAC systems, measuring filter differential pressure is common, and in chemical plants, measuring tank level is common.
In harsh environments, the 3051S is the best choice for OEM integration, multivariable sensing, or being able to start up from a cold state. Because it is made up of separate parts, setup changes can be made without having to buy a whole new instrument. This keeps extra parts from having to be bought and stored, which saves big facilities money. You can also use it with safety-instrumented systems that need FMEDA data and SIL approval forms that have already been checked and approved.
If you need to measure standard flow or level in petrochemicals, water treatment, or power generation, the 3051CD is a great choice. Its base has been used before and will stay stable for 12 years. If you need output that can change, OEM integration that is specific, or stability in cold temperatures below -40°F, the 3051S is the better pick. Emerson backs both types and makes sure they follow all the rules for approval, so there is no technical risk if either choice is made properly.
You can get both transmitters from authorized distributors and Emerson sales offices in your area. Prices change depending on the type of process link, the material chosen, and the communication mode. There are bulk purchasing agreements for big projects, and lead times for stock items are usually a few days to a few weeks. Lead times for custom-configured units are longer.
Through approved outlets, the Rosemount 3051CD differential pressure transmitter comes with a limited warranty that lasts for five years. You can get calibration, repair, and firmware changes through service plans from Emerson or its approved partners. Because the 3051 platform is used in over one hundred thousand units around the world in a wide range of industries, spare parts are easy to find for both models.
When you buy from a certified distributor like Shaanxi Honglixing Electronic Technology Co., Ltd., you can be sure that the product is real and get expert help in your own language. The company handles the selection, pricing, delivery, installation, commissioning, and ongoing technical support. This means that procurement teams only need to talk to one person from the time of the order until it is put into use.
In terms of measuring pressure, Emerson Rosemount has been the top choice for decades. The 3051 platform has over 12 years of stability data from sites around the world, and it is backed by third-party SIL approval and IEC 61508 compliance. Emerson's testing and verification programs are based on ISO 9001 standards. This gives purchasing teams proof that quality control is carried out at every stage of production.
For both the 3051CD and 3051S, you can get official datasheets, installation manuals, and FMEDA reports directly from Emerson. These papers help with technical review, managing safety throughout the product lifetime, and making sure that regulations are followed. Emerson has a professional support network that covers the whole world, and in most big industrial markets, you can find qualified installers.
When 3051 series receivers are used in petrochemical processing, power production, and local water systems, repair times are shortened, and the total cost of ownership goes down. This platform is one of the most popular differential pressure tools in industrial process control because it is stable over time, has smart monitoring, and works with a lot of different communication protocols.
Which one you choose between the Rosemount 3051CD differential pressure transmitter and 3051S depends on the needs of your process. For most flow, level, and pressure measurement needs, the 3051CD is the best choice. It works best when installed flat, has a large range-down ratio, and has been shown to be stable over time. The 3051S is good for uses that need data with multiple variables, start-up in cold environments, or deeper OEM interaction. No matter which model you choose, you'll have a solid base thanks to Emerson's global support network and full safety certifications.
The 3051CD has a 150:1 range-down ratio and is stable for 12 years thanks to its unique Coplanar technology for straight mounting. The 3051S has a modular, multi-variable platform that lets more OEMs integrate it and can start up in temperatures as low as -58°F (-50°C).
Yes. From -40°F to 250°F (-40°C to 121°C), the 3051CD works reliably. Extra-long diaphragm seal kits can be bought as an add-on for very high process temperatures.
Because the URL stays stable within 0.1% over 12 months and is guaranteed to stay stable for 12 years, calibration intervals can be much longer than with regular transmitters. This cuts down on downtime for upkeep and lowers the cost of running the device over its lifetime.
Yes. The 3051S has SIL 2/3 certification according to IEC 61508 and comes with pre-validated FMEDA data. This makes it a well-documented choice for safety-instrumented system applications that need lifecycle documentation.
As an official Emerson supplier, HLX sells real Rosemount 3051CD differential pressure transmitters and 3051S differential pressure transmitters. Our expert team helps you choose the right setup for your needs, handles pricing for large orders, and offers support after the sale for as long as the product is in service. Please email us at sales01@hlx8.com to get a price or product information.
1. Emerson Process Management. Rosemount 3051 Pressure Transmitter Product Data Sheet. Emerson Electric Co., 2023.
2. Emerson Process Management. Rosemount 3051S Series of Instrumentation: Reference Manual. Emerson Electric Co., 2022.
3. International Electrotechnical Commission. IEC 61508: Functional Safety of Electrical/Electronic/Programmable Electronic Safety-Related Systems. IEC, 2010.
4. Lipták, Béla G. Instrument Engineers' Handbook: Process Measurement and Analysis, Volume 1. CRC Press, 2003.
5. Battikha, Naguib E. The Condensed Handbook of Measurement and Control. ISA Press, 2004.
6. NACE International. NACE MR0175/ISO 15156: Petroleum and Natural Gas Industries — Materials for Use in H2S-Containing Environments. NACE International, 2015.
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