Product Overview
The Rosemount 2051CD2A02A1AH2B1E1Q4 is a Coplanar differential pressure transmitter engineered by Emerson Process Management as part of the widely adopted Rosemount 2051 pressure family, delivering dependable measurement of differential pressure, gage pressure, and DP-derived flow and level across process industries. Configured on the proven 2051C Coplanar platform, this transmitter combines the sensor module, electronics housing, and process flange into a single integrated assembly that mounts directly toRosemount 304 and 305 manifolds, integral primary elements, or the traditional flange specified in this configuration. The model designation 2051CD2A02A1AH2B1E1Q4 encodes its full build specification: 2051C Coplanar design, D for differential measurement, range 2 spanning −250 to 250 inH₂O (−623 to 623 mbar), A for 4–20 mA output superimposed with a HART digital signal, alternate process connection with 316L stainless steel isolating diaphragm, glass-filled PTFE O-ring, silicone fill fluid, and aluminum housing with 1/2–14 NPT conduit entry.
Included option codes further define the mechanical and compliance profile of the Rosemount 2051CD2A02A1AH2B1E1Q4: the H2 traditional flange provides a 316 SST process flange with SST drain/vent ports for clean liquid or gas service, the B1 bracket enables direct mounting on a 2-inch pipe stand, the E1 code carries ATEX Flameproof certification for hazardous-area installations, and the Q4 calibration certificate documents factory calibration for audit and loop-check records. Positioned as the value tier of the Rosemount Coplanar portfolio beneath the 3051 series, this transmitter shares the same sensor module design, HART revision 5 digital protocol, and engineering conventions as its premium sibling while delivering best-in-class reference accuracy of ±0.065% of span for range 2 and long-term stability of ±0.125% of URL over five years.
For process manufacturers sustaining existing Rosemount installations or building new measurement points where Coplanar mounting geometry, HART interoperability, and ATEX-compliant hazardous-area service are required, the Rosemount 2051CD2A02A1AH2B1E1Q4 represents a mature, field-proven choice backed by an installed base spanning refining, chemical processing, power generation, water treatment, and industrial gas production worldwide.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Rosemount 2051CD2A02A1AH2B1E1Q4 |
| Manufacturer | Emerson Process Management (Rosemount) |
| Product Type | Coplanar Differential Pressure Transmitter |
| Measurement Type | Differential pressure (D) |
| Calibrated Range | −250 to 250 inH₂O (−623 to 623 mbar), Range 2 |
| URL / LRL | 250 inH₂O (0.62 bar) / −250 inH₂O (−0.62 bar) |
| Minimum Span | 2.5 inH₂O (6.2 mbar) |
| Output Signal | 4–20 mA with superimposed HART digital signal (Revision 5) |
| Reference Accuracy | ±0.065% of span (Ranges 2–4 standard); P8 high-accuracy option ±0.05% |
| Long-Term Stability | ±0.125% of URL for 5 years (Ranges 2–5) |
| Turndown | Up to 100:1 |
| Isolating Diaphragm | 316L stainless steel |
| O-Ring | Glass-filled PTFE |
| Fill Fluid | Silicone |
| Process Flange (H2) | Traditional flange, 316 SST, SST drain/vent |
| Housing / Conduit | Aluminum housing, 1/2–14 NPT conduit entry |
| Mounting Bracket (B1) | Traditional flange bracket, 2-in. pipe mounting, CS bolts |
| Power Supply | 10.5 to 42.4 V DC with no load |
| Overpressure Limit | 3,626 psig (250 bar) without damage |
| Static Pressure Limit | −14.2 psig to 3,626 psig |
| Burst Pressure | 10,000 psig (689.5 bar) |
| Ambient Temperature Effect | ±(0.025% URL + 0.125% span) from 1:1 to 5:1 turndown |
| Enclosure Rating | NEMA 4X / IP66, IP67, IP68 |
| Hazardous-Area Certification | ATEX Flameproof (E1) |
| Calibration Certificate | Q4 factory calibration certificate |
| Shipping Weight | Approx. 9.8 lb (4.4 kg) with H2 flange and B1 bracket |
