Emerson Rosemount 770XA Data Sheet
Rosemount™ 770XA Natural Gas
Chromatograph
Product Data Sheet
00813-0200-3770, Rev AA
September 2020
Rosemount 770XA Gas Chromatographs provide the most accurate analysis of natural gas available in a field mounted gas
chromatograph (GC). This GC features a design that increases analytical capability, maximizes ease of use, and widens the range of
analysis options in a GC with an ambient temperature rating of -4 to 140 °F (-20 to 60 °C). These advanced features make this GC
ideal for natural gas custody transfer and applications requiring advanced analyis, such as C9+ (with hydrocarbon dew point and
cricondentherm calculations), total sulfur, and C6+ with hydrogen sulfide (H2S).
Rosemount 770XA September 2020
Features and benefits
Easy to use
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Single bolt analytical valve design for easy overhaul in the field
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Large column canister for both micro-packed and capillary columns of long lengths
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Internal stream selection and valve actuation soleniods that can be replaced easily in under five minutes
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Easy to use MON2020™ software for diagnostics
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Four conduit entry points in the electronics housing for easy wiring access
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One package for fiscal metering or gas quality
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Custody transfer analysis from C6+ to C9+
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Contaminant monitoring - trace hydrogen sulfide, carbon dioxide, oxygen, etc.
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Combine measurements and reduce analysis cost
— C9+ with hydrocarbon dew point
— C6+ with H2S (3 to 30 ppm H2S)
— C6+ with oxygen
— C6+ with helium and hydrogen
— C9+ with methanol and water
— Total sulfur
— C6+ with total sulfur
— C9+ with total sulfur
Reduced installation costs
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Flexible power with both 120/240 Vac and 24 Vdc options
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Integrated controller electronics
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Pipe-mount, wall-mount, or floor-mount
Contents
Features and benefits........................................................................................................................................................................ 2
Applications...................................................................................................................................................................................... 3
Superior performance....................................................................................................................................................................... 6
Controller electronics and communications...................................................................................................................................... 8
Data archiving and reports.................................................................................................................................................................9
MON2020™........................................................................................................................................................................................9
Integration with third-party networks..............................................................................................................................................11
Analytical systems and integration services..................................................................................................................................... 12
Specifications.................................................................................................................................................................................. 13
Recommended installation..............................................................................................................................................................17
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Lower operational costs
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No shelter or instrument air required
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Low carrier and power consumption
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Longest gas chromatograph valve and column warranties available
Applications
Standard natural gas applications
Emerson has made popular end-user energy and gas quality applications standard on all Rosemount gas chromatographs.
Applications may vary by components of interest, analysis time, reduced hardware, or improved precision. For non-standard
natural gas applications, Emerson can custom-engineer the Rosemount 770XA Gas Chromatograph to fit most requirements.
Energy measurement (to C6+, C7+, and C9+)
The Rosemount 770XA Gas Chromatograph standard applications for energy measurement include C6+ (three minutes), C7+ (ten
minutes), and C9+ (five minutes). The latest GPA 2145/2172, AGA-8, and ISO 6976 calculations are available and can be configured
to be calculated together.
Table 1: Standard Measurement Ranges
Gas component Range C6+ C7+ C9+
Methane 65 to 100 mole % Yes Yes Yes
Ethane 0 to 20 mole % Yes Yes Yes
Propane 0 to 10 mole % Yes Yes Yes
n-Butane 0 to 5 mole % Yes Yes Yes
Iso-Butane 0 to 5 mole % Yes Yes Yes
n-Pentane 0 to 1 mole % Yes Yes Yes
Iso-Pentane 0 to 1 mole % Yes Yes Yes
Neo-Pentane 0 to 1 mole % Yes Yes Yes
Heptane
Nitrogen 0 to 20 mole % Yes Yes Yes
Carbon dioxide 0 to 20 mole % Yes Yes Yes
Hexanes
Heptanes
Octanes
Nonane
(1)
(2)
(3)
(1)
(2)
(2)
(3)
(3)
C7+ analysis results
C7+ and C9+ analysis results
C9+ analysis results
0 to 1 mole % Yes Yes Yes
0 to 1 mole % Yes Yes Yes
0 to 1 mole % No Yes Yes
0 to 0.5 mole % No No Yes
0 to 0.5 mole % No No Yes
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Gas quality analysis
Natural gas contaminants, such as hydrogen sulfide and oxygen, reduce pipeline integrity over time. The Rosemount 770XA Gas
Chromatograph (GC) can easily measure most contaminants for online quality assurance.
The GC can combine contaminant monitoring with energy measurements for complete custody transfer analysis. To the extent
possible, these combined applications use independent gas chromatograph valves, detectors, and columns for each primary
measurement. This technique offers greater reliability, increased speed, and easier troubleshooting. This application approach also
simplifies field upgrades and re-applications in the analyzer by minimizing internal piping changes.
Hydrocarbon dew point monitoring
The Rosemount 770XA Gas Chromatograph offers accurate and reliable hydrocarbon dew point calculations from the extended
C9+ analysis by combining two detectors and a controller within a single housing, reducing complexity, minimizing maintenance
and spare parts requirements, simplifying the scope of analyzers at the pipeline, and reducing the overall cost of the analytical
solution.
This GC integrates hydrocarbon dew point software into the gas chromatograph to provide dew point temperatures for up to four
user-entered pressures and the cricondentherm using the Peng-Robinson or the Redlich-Kwong-Suave equations of state. Use
analog or Modbus® inputs from another device for the calculation pressures to get real-time dew point results.
The measured C6/C7/C8 and C9+ components allow for an accurate determination of the hydrocarbon dew point for pipelinequality natural gas using reliable and low-maintenance thermal conductivity detectors (TCDs), avoiding standalone dew point
analyzers or flame ionization detectors (FIDs), which require additional utility gas requirements. For heavier gas applications where
significant amounts of components above C10 are expected, an FID can be combined with a TCD to provide further extended
analysis.
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Rosemount 770XA
Custom applications
If the standard applications do not fit your needs, Emerson can customize the Rosemount 770XA Gas Chromatograph to meet
many measurement requirements. Submit a completed application data sheet with your request or ask our application engineers
for assistance.
A typical phase curve showing the cricondentherm and the hydrocarbon dew point calculated at three pressures for practical
operational use.
A. Pipeline pressure
B. Regulated pressure
C. Sample handling pressure
D. Cricondentherm
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Superior performance
Modular analytical oven
Building off of the proven valves, columns, and detectors of the Rosemount 500 and Rosemount 700 gas chromatographs (GCs),
the Rosemount 770XA gas chromatograph analytical oven has been designed for maximum serviceability and expandability. It
features a clean architecture with few cables, making the analyzer simple to maintain. In addition, the oven features a unique,
pivot-top base that provides maximum accessibility to all of the components below.
Multiple temperature control zones and up to four 6-port or 10-port valves and two independent detectors provide extreme
application flexibility and range. All components in the oven are completely accessible and serviceable in the field to reduce the
total cost of ownership over the life of the analyzer.
Unique analytical assembly design pivots to allow instant access to all components.
Gas chromatograph valves
The GC has the capacity to support up to six 6-port or 10-port diaphragm/piston gas chromatograph valves. These pneumatic
valves are guaranteed for the life of the gas chromatograph and are specified to operate over five million cycles. The unique,
double-diaphragm design removes the need for springs, O-rings, and lubrication. To service the valve, the operator just needs to
replace a cost-effective diaphragm set, which can normally be done in less than ten minutes.
Thermal conductivity detectors (TCDs)
The TCD is the detector of choice for most applications due to its universal response to components of interest in natural gas and
light refinery and hydrocarbon processing gas analysis. The TCD in the Rosemount 770XA GC is able to measure well beyond the
normal ranges seen in other designs by performing many applications with low parts-per-million measurement requirements. This
greatly simplifies the GC design and lowers the cost to the end user when a simple and rugged TCD can be used.
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