What’s the Difference Between Rosemount 3051GP and 3051CG?
Let’s Break It Down!
Hey there! If you’ve ever found yourself staring at a Rosemount 3051 pressure transmitter and wondering what exactly sets the 3051GP and 3051CG apart—you’re not alone. It’s a common question, especially since both are super reliable and widely used in industrial applications. But guess what? They’re designed for completely different jobs.
In simple terms:
The Rosemount 3051GP is a gauge pressure transmitter, which means it measures pressure relative to atmospheric pressure.
The Rosemount 3051CG, on the other hand, is a capillary remote mount transmitter used for measuring pressure in hard-to-reach or extreme conditions—with the help of a remote diaphragm seal and a capillary tube.
Still with me? Don’t worry—we’re going to unpack this in plain English. No confusing engineer-speak, I promise!
Let’s Start with the Rosemount 3051GP
The “GP” stands for Gauge Pressure. This little workhorse is your go-to for measuring pressure in pipes, tanks, or vessels where you need to know the pressure compared to the air around us.
Think of it like checking the tire pressure in your car. You’re measuring how much air is in the tire compared to the outside atmosphere. That’s exactly what the 3051GP does—but for industrial processes like water treatment, HVAC, or even food and beverage production.
It’s straightforward, accurate, and perfect when your process isn’t dealing with crazy temperatures or clog-prone materials.
Now, Meet the Rosemount 3051CG
The “CG” stands for Capillary Remote Gauge—and yes, that sounds a bit more complicated. But here’s the simple version:
This guy is built for the tough jobs.
If your process involves super high temperatures, super cold fluids, super viscous stuff (like slurry or honey), or corrosive materials, the 3051CG is your best friend.
Why? Because it uses a remote diaphragm seal connected to the transmitter by a capillary tube. The seal gets installed right where the pressure needs to be measured, even if that spot is super hot or corrosive. The capillary tube carries the pressure signal back to the transmitter, which can be mounted somewhere safe and accessible.
So, while the 3051GP is installed directly into the process, the 3051CG keeps its distance—literally.
Key Differences at a Glance
| Feature | Rosemount 3051GP | Rosemount 3051CG |
|---|---|---|
| Measurement | Gauge pressure | Gauge pressure (via remote seal) |
| Installation | Direct mount | Remote mount with capillary tube and seal |
| Use Cases | General purpose, low-risk environments | Extreme temps, viscous fluids, corrosive media |
| Flexibility | Simple and compact | Adaptable to challenging conditions |
| Maintenance | Easier access | Requires care with capillary length and sealing |
Which One Should You Choose?
So, which one is right for you?
Go with the 3051GP if you’re dealing with “normal” conditions—like air, water, steam, or gases at reasonable temperatures.
Choose the 3051CG if your process involves super hot fluids, super cold liquids, sticky goo, or aggressive chemicals that could damage a directly mounted sensor.
It all comes down to where and what you’re measuring.
Wrapping Up
And there you have it! The Rosemount 3051GP and 3051CG might look similar at first glance, but they’re designed for very different challenges. One is your everyday pressure measurer, and the other is your specialty problem-solver.
If you still aren’t sure which model fits your application, don’t guess—reach out to a certified Rosemount supplier. Getting the right tool matters for safety, accuracy, and efficiency!
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