Rosemount 3051CG3A02A1AH2B2 Pressure Transmitter – Coplanar Gage HART 4-20mA

Brand ABB

Model Rosemount 3051CG3A02A1AH2B2

Product Overview

The Rosemount 3051CG3A02A1AH2B2 is a coplanar gage pressure transmitter from Emerson’s Rosemount 3051C series, engineered for precise pressure measurement in industrial process control applications. As a member of the 3051C platform, the 3051CG3A02A1AH2B2 combines the proven capacitive sensor technology of the Rosemount 3051 family with a flexible Coplanar™ architecture that supports differential, gage, and absolute pressure measurement configurations. The “CG” designation identifies this specific model as a gage pressure transmitter, while the “3” range code specifies a measurement span of -393 to 1000 inH₂O, making the 3051CG3A02A1AH2B2 suitable for a broad spectrum of low-to-medium pressure monitoring tasks in liquid, gas, and steam service .

The 3051CG3A02A1AH2B2 incorporates a 4-20 mA output with HART digital communication protocol, enabling both traditional analog loop signaling and digital configuration, diagnostics, and calibration via a HART communicator or asset management system. The transmitter operates on a 10.5 to 42.4 VDC external power supply, drawing power directly from the current loop. This two-wire design simplifies field wiring and eliminates the need for separate power conductors in most installations . The “A1” housing code denotes an aluminum housing with 1/2-14 NPT conduit entry, providing a lightweight yet durable enclosure suitable for general-purpose and hazardous area installations.

The 3051CG3A02A1AH2B2 features Rosemount’s industry-leading capacitive sensor element with a 316L stainless steel isolating diaphragm as standard. The Coplanar platform allows direct mounting of manifolds, primary elements, and remote seal systems without additional adapters, reducing installation complexity and potential leak paths. The transmitter’s modular design permits field replacement of the sensor module and electronics board, extending service life and simplifying maintenance .

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	3051CG3A02A1AH2B2
Manufacturer	Rosemount / Emerson
Product Series	3051C Coplanar
Product Type	Gage Pressure Transmitter
Measurement Type	Gage Pressure (CG)
Range Code	3 (-393 to 1000 inH₂O / -0.97 to 2.48 bar)
Output Signal	4-20 mA with HART Protocol
Power Supply	10.5-42.4 VDC (External, Loop-Powered)
Accuracy	±0.075% of Span (Standard)
Stability	±0.1% of Span per Year
Process Connection	ISO 2856-DIN Flange / Coplanar
Diaphragm Material	316L Stainless Steel
Housing Material	Aluminum, 1/2-14 NPT Conduit Entry
Communication Protocol	HART 7
Operating Temperature	-40°C to +85°C
Process Temperature	-40°C to +121°C
Enclosure Rating	NEMA 4X, IP66/IP67
Safety Certification	SIL 2/3, Ex ia IIC T6 Gb
Weight	Approx. 2.5 kg

Main Features and Advantages

Proven Capacitive Sensor Technology: The 3051CG3A02A1AH2B2 employs Rosemount’s field-proven capacitive sensing element, which measures pressure by detecting the minute deflection of a tensioned diaphragm. The diaphragm’s maximum displacement is only 0.004 inches, ensuring linear response and minimal hysteresis across the measurement range. This sensor design provides the 3051CG3A02A1AH2B2 with exceptional repeatability and long-term stability, with a published stability specification of ±0.1% of span per year .

Flexible Coplanar Platform: The Coplanar architecture of the 3051CG3A02A1AH2B2 allows direct mounting of 3-valve and 5-valve manifolds, primary flow elements, and remote seal systems without intermediate adapters. This integrated design reduces potential leak points, simplifies installation, and saves up to 20% in installation labor compared to conventional transmitter configurations requiring separate mounting hardware.

HART Digital Communication: The 3051CG3A02A1AH2B2 supports full HART 7 communication, enabling remote configuration, range adjustment, and diagnostic interrogation without breaking the current loop. Technicians can use a Rosemount 475 Field Communicator or asset management software to access the 3051CG3A02A1AH2B2‘s configuration parameters, sensor trim values, and diagnostic status, streamlining commissioning and maintenance activities.

Robust Safety and Compliance: The 3051CG3A02A1AH2B2 carries SIL 2/3 certification for safety instrumented system applications, making it suitable for critical process monitoring where failure could result in hazardous conditions. The transmitter’s intrinsic safety approval (Ex ia IIC T6 Gb) permits installation in Zone 0 hazardous areas when used with appropriate barriers or galvanic isolators. The integral Dual Seal design complies with ANSI/NFPA 70-202 and ANSI/ISA 12.27.0 requirements for secondary containment .