3051CD with unique serial number 6811733 is Emerson Rosemount coplanar differential pressure transmitter adopting proprietary coplanar modular structure, specially designed for differential pressure measurement. Widely used in thermal power, petrochemical and oil & gas industries, it works with orifice plates and annubar primary elements to calculate flow rate, and performs hydrostatic level measurement for closed tanks as well as pipeline differential pressure monitoring.

A high-precision capacitive sensing element converts differential pressure into standard electrical signal with built-in digital communication function. Its coplanar body allows direct mounting with three-valve or five-valve manifolds without transition adapters, simplifying impulse piping layout and reducing medium leakage points effectively. Embedded intelligent diagnostic circuitry continuously monitors impulse line clogging and electrical loop faults to minimize unplanned maintenance and unexpected production shutdown. Each unit completes factory calibration and pressure reliability test for direct commissioning after field installation.

Reference accuracy reaches up to ±0.04% of full calibrated span, and overall installed performance is controlled within ±0.15% full scale. The maximum adjustable turndown ratio is 150:1 to support flexible on-site span modification without hardware replacement. Long-term stability is kept within ±0.125% of calibrated span over five years of continuous operation.

Standard output is 4–20mA analog signal superimposed with HART7 digital communication, enabling remote parameter configuration via handheld communicator or DeltaV DCS system. Optional communication protocols include FOUNDATION Fieldbus H1, PROFIBUS PA and WirelessHART according to customized order. The conventional loop-powered HART transmitter requires supply voltage ranging from 10.5VDC to 42.4VDC.

Default wetted parts including isolation diaphragms and coplanar flanges adopt 316L stainless steel. Optional corrosion-resistant grades such as Hastelloy C-276, Monel alloy and tantalum are available for corrosive medium and NACE sour service conditions. The outer enclosure is die-cast aluminum with anti-corrosion epoxy coating, and silicone oil is standard internal sensor fill fluid for regular process media.

Operating and storage ambient temperature both range from -40℃ to +85℃; applicable relative humidity is 5%~95% under non-condensing environment. Equipped with standard silicone fill fluid, permissible process medium temperature covers -40℃ ~ +120℃.

Optional backlit local LCD supports on-site real-time data display and zero-span trimming. Integrated body push buttons allow field calibration without extra auxiliary tools. Advanced onboard diagnostics cover blocked impulse line detection, power loop status monitoring and abnormal process early warning.

This transmitter obtains SIL2/SIL3 functional safety certification complying with IEC61508 standard, as well as ATEX and FM explosion-proof approvals for installation in classified hazardous locations, protected by Emerson five-year limited factory warranty.

Main applications include differential flow measurement of industrial process pipelines, sealed tank hydrostatic liquid level detection, differential pressure monitoring on power plant boiler piping and auxiliary loops of chemical reactors.