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Rosemount™ 770XA Natural Gas Chromatograph
The Rosemount 770XA GC provides accurate analysis of natural gas in an explosion-proof, transmitter-style design.
With its parallel chromatography and ATEX/IECEX safety rating, the Rosemount 700XA is ideal for natural gas custody transfer and applications requiring advanced gas composition analysis such as C9+ with hydrocarbon dew point (HCDP) calculations, C6+ and Total Sulfur measurement. The field-mountable design of the Rosemount 770XA GC reduces the need for elaborate analyzer shelters or temperature control requirements.

Natural Gas Quality Analysis Using Rosemount 700XA Gas Chromatograph

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Rosemount™ 770XA Natural Gas Chromatograph


Analog inputs: Two standard isolated inputs filtered with transient protection, 4–20 mA (user scalable and assignable)
Digital inputs: Five inputs, user assignable, optically isolated, rated to 30V DC @ 0.5 A
Analog outputs: Six self-powered isolated outputs (4–20 mA)
Digital outputs: Five user-assignable outputs, Form C and electromechanically isolated, 24V DC
Communication Protocol
Ethernet: Two ports – one RJ-45 and one four-wire – with 10/100 mbps
Serial: Three termination blocks, configurable as RS-232, RS-422 or RS-485 and one RS-232 D-sub (9-pin) Modbus/PC Connection
Power Supply
Standard: 24V DC (21–30 VDC)
Optional: 90–264V AC, 47–63 Hz
CSA for USA: Class I, Zone 1, AEx d IIC, Enclosure Type 4. Class I, Division 1, Groups B, C, and D, IP66
CSA for CANADA: Class I, Zone 1, Ex d IIC, Enclosure Type 4. Class I, Division 1, Groups B, C, and D, IP66.
ATEX / IECEx. Ex II 2G. Ex d IIC Gb T6. (Ta = -20 °C to 60 °C)
Wall-mount: 711 mm H x 445 mm W x 498 mm D (28 " H x 17.5 " W x 19.6 " D)
Pipe-mount: 711 mm H x 445 mm W x 671 mm D (28 " H x 17.5 " W x 26.4 " D)
Floor-mount: 1532 mm H x 445 mm W x 612 mm D (60.3 " H x 17.5 " W x 24.1 " D)
Floor-standing (standard), wall- or pipe-mount (optional)
50 kg (110 lbs.)


  • Industry's first transmitter-style chromatograph capable of combining the measurement of natural gas energy content, hydrogen sulfide, speciation of total sulfur compounds to trace levels, and hydrocarbon dew point (HCDP) calculations in a single-analyzer solution
  • Explosion-proof and ATEX/IECEX safety rating enables field installation without enclosure even in Class 1, Division 1 areas
  • No instrument air for purge or oven required, reducing power consumption over traditional air purged GC units
  • Secure, remote operation capabilities enable audit checks and reduce the need to attend remote locations
  • Wide dynamic measurement ranges from percent to trace-level components
  • Micro flame photometric detector (µFPD) and micro flame ionization detector (µFID) sensitive to parts-per-billion levels
  • Thermal conductivity detector (TCD) sensitive down to low parts-per-million levels
  • Reliable performance over broad ambient temperatures -20 °C to 60 °C / -4 °F to 140 °F (application-dependent)
  • Fully compatible with modern Ethernet networks and DCS communication
  • Storage of up to 2,500 chromatograms, including sample calibration and validation streams