Rosemount 3051GP vs. 3051CG: What’s the Difference ?
Meta Description: Confused about Rosemount 3051GP vs. 3051CG? Learn the key differences in applications, specs, and how to pick the right pressure transmitter.
What’s the Real Difference Between Rosemount 3051GP and 3051CG?
If you’re shopping for a Rosemount 3051 pressure transmitter, you’ve likely stumbled into the “GP vs. CG” debate. Both models are industry favorites, but their differences matter for performance and cost. Let’s cut through the jargon and break down what sets the 3051GP and 3051CG apart—and how to pick the right one for your needs.
1. The Basics: What Do GP and CG Even Stand For?
- Rosemount 3051GP: The “GP” stands for Gauge Pressure. This model measures pressure relative to atmospheric pressure. Think tanks, pipes, or systems where you need to monitor pressure changes in “open” environments.
- Rosemount 3051CG: The “CG” stands for Closed, Gauge. It’s designed for sealed systems where the reference pressure is fixed (not influenced by atmospheric changes). Perfect for applications like steam lines or processes with fluctuating ambient conditions.
2. Key Differences at a Glance
Here’s the TL;DR version:
| Feature | 3051GP | 3051CG |
|---|---|---|
| Pressure Reference | Atmospheric (vented) | Sealed, fixed reference |
| Best For | General-purpose gauge pressure | Stable measurements in sealed systems |
| Durability | Good | Better for humid/corrosive environments |
| Price | Typically lower | Slightly higher (specialized design) |
3. Where Each Model Shines
Choose the 3051GP if…
- You’re measuring liquid levels in open tanks.
- Your process isn’t exposed to extreme temperature swings or humidity.
- Budget is a priority, but you still need Emerson’s reliability.
Go with the 3051CG if…
- Your system is sealed (e.g., steam, HVAC, or chemical processing).
- Ambient conditions vary wildly (moisture, temperature).
- Long-term stability is non-negotiable.
4. Pro Tip: Don’t Overcomplicate It
Both transmitters share the same core DNA (accuracy, diagnostics, etc.). The big question is: Does your application need a vented or sealed reference? If atmospheric pressure won’t mess with your readings, the 3051GP saves cash. If you’re battling environmental variables, the 3051CG’s sealed design is worth the extra spend.
Still Stuck?
Drop your use case in the comments! We’ll help you decide whether the GP or CG is your match.