3051CD marked with serial number 6465636 is a coplanar differential pressure transmitter from Emerson Rosemount. Relying on patented coplanar modular design, this product is mainly used for differential pressure measurement across petrochemical, thermal power and oil & gas industries. It matches orifice plates and annubar flow elements for flow computation, and also realizes closed tank liquid level measurement and pipeline differential pressure supervision.

Equipped with high-precision capacitive sensor, it converts differential pressure into standard electrical signal with digital communication. The coplanar structure can be directly connected with three-valve or five-valve manifolds without extra adapters, simplifying field impulse piping and lowering medium leakage risk. Built-in intelligent diagnosis continuously checks blocked impulse lines and circuit faults to cut unplanned maintenance and production halt. All units complete factory calibration and pressure inspection for direct field put-in-service after installation.

Reference accuracy reaches up to ±0.04% of full calibrated span, and overall installed performance stays within ±0.15% full scale. The maximum turndown ratio is 150:1 to support flexible onsite range setting without hardware replacement, while five-year long-term stability is controlled within ±0.125% of calibrated span during continuous operation.

Standard output is 4–20mA analog signal with superimposed HART7 digital protocol, allowing remote parameter setup via handheld communicator or DeltaV DCS system. Optional communication types include FOUNDATION Fieldbus H1, PROFIBUS PA and WirelessHART based on order requirements. The conventional loop-powered HART transmitter requires supply voltage from 10.5VDC to 42.4VDC.

Standard wetted components such as isolation diaphragms and coplanar flanges adopt 316L stainless steel. Optional corrosion-resistant alternatives including Hastelloy C-276, Monel alloy and tantalum are available for corrosive fluid and NACE sour service. The transmitter housing is die-cast aluminum with anti-corrosion epoxy coating, and silicone oil serves as standard sensor fill fluid for general process conditions.

Ambient operating and storage temperature range from -40℃ to +85℃; applicable relative humidity is between 5% and 95% under non-condensing environment. With standard silicone filling fluid, allowable process medium temperature covers -40℃ to +120℃.

Optional backlit local LCD enables on-site real-time data reading and zero-span trimming. Body-mounted push buttons support field calibration without additional tools. Advanced onboard diagnostics include blocked impulse line detection, loop health monitoring and abnormal process warning.

This differential pressure transmitter has SIL2/SIL3 certification per IEC61508 standard, plus ATEX and FM explosion-proof approvals for hazardous area installation, and it is covered under Emerson’s five-year limited factory warranty.

It is widely used for differential flow measurement on industrial pipelines, hydrostatic level measurement of sealed storage tanks, differential pressure monitoring for boiler and chemical reactor auxiliary piping in power and chemical facilities.