This unit marked 3051C with unique factory serial number 6968087 is Emerson Rosemount Coplanar smart pressure transmitter for industrial process measurement. Designed on proprietary Coplanar modular construction, it supports differential pressure, gauge pressure and absolute pressure measurement, widely deployed in petrochemical, oil & gas, thermal power and fine chemical industries for pipeline pressure, tank liquid level and differential flow monitoring with orifice and annubar flow elements.

Adopting high-precision capacitive sensing core, the transmitter realizes conversion from process pressure signal to standard industry electrical signal with digital communication overlay. It comes factory pre-calibrated and pressure tested for direct field installation, compatible with standard coplanar 3-valve or 5-valve manifold without extra transition adapter, greatly simplifying site piping layout and reducing leakage risk of impulse piping. Multiple intelligent diagnostic functions are embedded inside circuit board to monitor process abnormal status and circuit fault, lowering unplanned maintenance and shutdown loss for production unit.

Reference precision reaches up to ±0.04% of calibrated full span; total installed performance under actual working condition is controlled within ±0.15% full scale. Long-term stability is ±0.125% of span within five-year operation cycle, maintaining stable measuring performance in continuous industrial running environment. The adjustable turndown ratio can reach maximum 150:1 to satisfy wide range span modification on site without replacing hardware.

Differential pressure measuring scope ranges from 0.5 inH₂O up to 2000 psi; gauge pressure spans from 2.5 inH₂O to 2000 psig; absolute pressure available from 0.167 psia to 4000 psia according to factory configuration of this serial unit.

Standard mainstream output is 4–20 mA DC analog signal superimposed with HART digital protocol (default HART7 version), supporting remote parameter configuration via handheld communicator or DeltaV DCS system; optional communication types include FOUNDATION Fieldbus H1, PROFIBUS PA and WirelessHART upon customized order. For 4–20mA/HART loop-powered model, operating supply voltage ranges from 10.5 VDC to 42.4 VDC; low-power optional 1–5VDC HART version needs separate auxiliary power source.

Standard process isolating diaphragm and coplanar flange adopt 316L stainless steel as wetted material; alternative corrosion-resistant options include Hastelloy C-276, Monel Alloy 400 and tantalum for strong acid or alkali corrosive medium working condition, complying with NACE MR0175 standard for sour service application. Transmitter housing is made of die-cast aluminum alloy with anti-corrosion epoxy coating for field harsh ambient protection, silicone is default sensor filling fluid for regular medium working scenario.

Ambient operating temperature scope is from -40 degrees Celsius to +85 degrees Celsius; storage temperature covers -40℃ to +85℃, applicable relative humidity from 5% to 95% non-condensing environment. Allowable process medium temperature is decided by internal filling fluid configuration, standard silicone fill fluid matches medium temperature range -40℃ ~ +120℃.

Optional local backlit LCD digital display module provides on-site real-time process value reading, zero and span trim operation; built-in local push-button option enables field calibration without external calibration tool. Embedded advanced diagnostics include plugged impulse line detection, loop circuit integrity monitoring and process fluctuation early warning alert.

The transmitter gains SIL2/SIL3 functional safety certification compliant with IEC61508 standard, as well as ATEX, FM explosion-proof approvals for installation in Class I Div hazardous location areas; NSF certification is available for food and hygienic production industry application on customized configuration. Emerson provides five-year limited factory warranty for standard configured 3051C transmitter series.

Primary application includes differential flow measurement matching orifice plate and annubar primary elements, closed tank hydrostatic liquid level detection via differential pressure method, boiler and reactor pipeline pressure real-time monitoring for power and chemical plant, natural gas pipeline gauge pressure and absolute pressure supervision in upstream oil & gas field.