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 770XASeptember 2020
Features and benefits
Easy to use
■
Single bolt analytical valve design for easy overhaul in the field
■
Large column canister for both micro-packed and capillary columns of long lengths
■
Internal stream selection and valve actuation soleniods that can be replaced easily in under five minutes
■
Easy to use MON2020™ software for diagnostics
■
Four conduit entry points in the electronics housing for easy wiring access
■
One package for fiscal metering or gas quality
■
Custody transfer analysis from C6+ to C9+
■
Contaminant monitoring - trace hydrogen sulfide, carbon dioxide, oxygen, etc.
■
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
■
Flexible power with both 120/240 Vac and 24 Vdc options
■
Integrated controller electronics
■
Pipe-mount, wall-mount, or floor-mount
Contents
Features and benefits........................................................................................................................................................................ 2
Superior performance....................................................................................................................................................................... 6
Controller electronics and communications...................................................................................................................................... 8
Data archiving and reports.................................................................................................................................................................9
Integration with third-party networks..............................................................................................................................................11
Analytical systems and integration services..................................................................................................................................... 12
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.
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.
4Emerson.com/Rosemount
September 2020
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
Rosemount 770XA5
Rosemount 770XA
September 2020
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.
6Emerson.com/Rosemount
September 2020
Rosemount 770XA
Micro flame photometric detector (µFPD)
The µFPD photo multiplier tube (PMT) module enables the measurements of trace sulfur compounds when integrated with
Rosemount 770XA GCs.
A. µFPD PMT Module
A. µFPD burner
The µFPD is installed in the analyzer oven. The associated electronics are mounted underneath. The design eliminates the need for
instrument air, greatly reducing installation cost of the GC. The µFPD module comes fully integrated with the GC.
Micro-packed columns
The GC offers micro-packed columns with a superior combination of features found in both capillary and conventional packed
columns: speed, sharp peak resolution, and low carrier gas consumption. In addition, the unique design provides for greatly
extended column life and the longest warranty available on the market. You can also use standard capillary columns in GC
applications if required.
Stream switching module
The internal sample stream switching module is available in four-stream or eight-stream versions. This saves end users the
additional hardware and assembly costs associated with externally mounted stream selection assemblies. The module uses inert
gas for solenoid actuation, with easy access for tubing changes and maintenance. For applications with varying stream
composition, a double-block-and-bleed configuration is optionally available.
Rosemount 770XA7
Rosemount 770XA
September 2020
Controller electronics and communications
Modular electronics
The controller electronics, option cards, and field termination boards are all packaged conveniently in the lower section of the gas
chromatograph (GC). Customer-terminated power and output connections are also made in this lower section of the GC.
Touch key local operator interface (optional)
The local operator interface (LOI) permits maintenance and operation of a GC without a laptop or personal computer (PC). The LOI
is a high-resolution color display that is touch key infrared activated and supports all core GC operations.
Features include:
■
Color LCD display with full VGA (640 x 840 pixels) resolution
■
User-adjustable auto-backlighting for easy viewing
■
Eight infrared-activated touch keys and screen saver
In addition, the LOI:
■
Eliminates external magnetic pen requirements and tactile buttons.
■
Maintains the Rosemount 770XA's hazardous area classifications.
■
Includes complete GC status, control, and diagnostics, including full chromatogram display and alarm messages.
Local indication and operation panel
You can view analyzer health and valve status through the GC's front cover. The panel displays green (healthy), yellow (warning),
and red (failure) light emitting diodes (LEDs), along with LEDs indicating gas chromatograph valve on/off actuations, power, and
central processing unit (CPU) health. Each valve can be actuated manually for simplified troubleshooting and fast system purging
after maintenance.
Flexible inputs and outputs (I/O)
The GC is built with enough I/O to handle most applications, including:
■
Five discrete digital outputs
■
Five discrete digital inputs
■
Two analog inputs
■
Six analog outputs
■
Three Modbus® serial ports (RS-232/RS-485/RS-422)
■
Two Modbus-enabled Ethernet ports (one with DHCP server for local access)
If you need more I/O, the GC includes two expansion slots that use the I/O cards from the ROC-800 family of flow computers.
8Emerson.com/Rosemount
September 2020
Rosemount 770XA
Data archiving and reports
The gas chromatograph (GC) includes expanded reports and data archiving that conforms to the latest API 21.1 requirements for
metering audit purposes and backup of the primary systems, such as flow computers or SCADA systems. Every analysis is time and
date stamped and archived for retrieval via the MON2020™ software.
Security
Event logs
Alarm logs
Maintenance log
Archiving
Chromatograms
Drawings and
documents
Four levels of password-protected security, configurable to read/write or read-only for third party
access.
A continuous record of all operator changes, with time, date, and user identification name records.
A continuous record of all historical alarms, time and date stamped with alarm state and description.
A scratch pad for tracking maintenace or testing performed on the GC system.
Over 31,700 analysis records (which is over 65 days for a C6+ three-minute application), 370 final
calibration records, and 370 validation records are archived automatically with time and date stamps.
Over 1,700 worth of analysis chromatograms and 370 chromatograms and user-selected protected
chromatograms that are permanently stored, including the factory testing chromatograms.
User manuals and drawings in several file formats are stored in the controller memory for convenient
retrieval using the MON2020 software, eliminating the risk of manuals and drawings being misplaced.
You can also upload user-generated documents (such as maintenance checksheets or installation
drawings) to the controller for later retrieval.
Standard reports include
Average reports
Analysis reports
Raw data report
Calibration report
Final calibration report
Molecular weight vs. response
factor graph
Hourly, 24-hour, weekly, monthly, and variable averages
Physical property calculations for component and group analysis and alarms
Retention times, peak areas, detector number, method, integration start/stop, and peak width
for analysis
Raw component data, new response factors, retention times, and deviation from last
calibration
Results from the calibration response factors and retention time adjustments
The response factors plotted on a log/log graph as outlined in the GPA2198-03 Appendix B to
confirm the fidelity of the detector response across components
MON2020
™
Emerson has designed the Rosemount 770XA gas chromatograph (GC) to operate unattended. If adjustments are needed,
Emerson's proprietary gas chromatograph software, called MON2020, allows complete control of the GC either locally or remotely.
From MON2020, you can:
■
Start or stop analysis, calibration, or validation cycles
■
Configure, ignite, and check the status of the micro flame photometric detector (µFPD) or the flame ionization detector (FID)
flames
■
Generate and save current and historical analysis and calibration reports
■
Review and modify analytical settings
■
Upload and display multiple chromatograms for comparison
■
Upload and trend any of the measured results
■
Export data to text, HTML, or Microsoft® Excel™ for use in third party applications
Rosemount 770XA9
Rosemount 770XA
■
Check on original calibration against the last calibration
■
Perform GC operation checks and modifications simultaneously
■
Upload and view manuals and drawings stored in the gas chromatograph
MON2020 is a Windows® based software program that makes analyzer configuration, maintenance, and data collection easy. With
intuitive drop-down menus and fill-in-the-blank tables, even new users can quickly navigate through the software.
Figure 1: MON2020 Interface
September 2020
A. Simple drop-down menus
B. Connect to any GC with a mouse click
C. Full featured chromatogram display
D. Response Factor Fidelity chart
E. Fully detailed Timed Events table
F. Automatic listing of measured components
G. Quickly add chromatograms to overlay
H. Save chromatograms to hard drive
With its abilities to communicate with your enterprise network and export to numerous file types, MON2020 is a powerful tool that
ensures operators, engineers, maintenance personnel, and management have access to critical data, such as current and archived
chromatograms, alarm history, event logs, and maintenance logs.
MON2020's chromatogram viewer allows you to view and compare both live and archived chromatograms simultaneously. Despite
its small size, the chromatogram file includes analysis and calculation results, integration and valve time settings, retention time
settings, and raw peak data.
MON2020's trend viewer makes it easy to trend multiple variables on a single chart. To help diagnose process or analysis issues, you
can select single or multiple points on the trend viewer; the chromatograms associated with these points will open in the
chromatogram viewer. You can save the trend files or export them as text, CSV, or Microsoft Excel files.
10Emerson.com/Rosemount
September 2020
MON2020 can connect to a Rosemount GC via Ethernet directly or over your local or wide area network. The software is equipped
with multi-level username and password security settings to limit and control access to the GC and provide levels of access
authority ranging from read-only access to full control of the GC and its data.
Rosemount 770XA
Integration with third-party networks
Whether you want to network gas chromatographs (GCs) throughout your network or simply link a single GC to a flow computer,
you can configure the Rosemount 770XA to handle almost any scenario.
■
Choice of Ethernet, Modbus® Serial, or 4–20 mA analog outputs
■
Use MON2020™ for diagnostics, configuration, and data retrieval over Ethernet, serial, or modem connections
■
Use multi-dropped serial or Ethernet networks to connect multiple XA series gas chromatographs
■
Able to connect to multiple personal computer (PC) workstations using MON2020
The GC supports three types of communication interfaces:
■
10/100 Mbps Ethernet connectivity
■
RS-232, RS-422, and RS-485 serial communication links
■
4–20 mA analog outputs
Ethernet connectivity
Two Ethernet interfaces are available on the GC. You can configure each interface with a static Internet protocol (IP) address,
subnet mask, and gateway.
You can configure the RJ45 connector Ethernet port to operate as a DHCP host to simplify local PC access.
The Ethernet interfaces on the GC serve MON2020 connections and Modbus TCP requests. The dual Ethernet interfaces can be
used in many ways. Examples:
■
Connect to a plant network for GC maintenance personnel and the other to a control network using Modbus TCP.
■
Connect to a broadband cellular wireless gateway for remote GC access, for data collection and maintenance, and the other for
a local connection.
OPC
With the optional GC-OPC server, the GC can connect via OPC with fully configurable definition files sand remote operation control
capabilities.
Modbus serial
The Modbus protocol is widely used today, because it is simple and effective. You can configure the GC to use the flow computer
industry standard SIM-2251 Modbus map and make it compatible with communication links from Danalyzer legacy GC
installations. You can also configure fully customized Modbus maps using either single register per floating point (ENRON format)
or two registers per floating point format, used in DCS and PLC systems.
You can configure three hard-wired serial ports as RS-232, RS-485, or RS-422 links to communicate to host systems using the
Modbus protocol. In addition, you can configure a fourth serial port for RS-232 with a nine-pin D-type connector that you can use
for direct connection to a Daniel® ultrasonic flow meter or local MON2020 access. The ultrasonic flow meter link enables the online
calculation of the speed of sound for continuous validation of the custody measurement. If more serial links are required, you can
add up to two additional serial ports using the two expansion ports using ROC800 series in/out (I/O) cards.
4-20 mA analog outputs
The GC supports six isolated 4-20 mA analog outputs that you can expand to fourteen analog outputs with optional expansion
cards.
Rosemount 770XA11
Rosemount 770XA
September 2020
Analytical systems and integration services
Emerson offers a comprehensive range of analytical system solutions and third party integration services. From stand-alone panels
and cabinets to three-sided shelters and environmentally controlled walk-in enclosures, our complete range of capabilities is
backed by over 60 years of analytical expertise across thousands of process installations throughout the world.
From front end engineering design (FEED) and consulting services to manufacturing, integration, and testing to commissioning
services and on-going lifecycle support, Emerson provides complete turnkey analytical solutions.
With full scope analytical systems integration centers and regional support facilities strategically located across the world, Emerson
has the global resources and analytical expertise to provide localized support.
Engineered sample systems
Any gas chromatograph (GC) is only as good as the quality of the sample it measures.
The standard sample system includes a particulate filter and liquid filter/shut-off for each sample stream. If required, Emerson can
also custom engineer the sample system for the specific requirements of the application.
Common features include:
■
Heated and open-panel designs
■
All components rated for the area classification
■
Variety of sample probes to extract a reliable and stable sample from the process
Environmental chamber testing
Every Rosemount GC that leaves an Emerson facility undergoes rigorous testing throughout assembly. Emerson puts the majority
of its systems systems into an 18-hour environmental chamber test, where the systems must operate to specification in an
environment where the temperatures cycle between 0 and 130 °F (-18 and 50 °C).
Figure 2: Environmental Testing Chamber
12Emerson.com/Rosemount
September 2020Rosemount 770XA
Specifications
Consult Emerson if your requirements are outside the specifications listed in this section. Improved performance, other products,
and material offerings may be available depending on the application.
Construction
Hazardous area certified for:
Environmental
temperature
Enclosure
protection rating
Dimensions
Corrosion
protection
Mounting
Approximate
weight (without
sample system)
-4 to 140 °F (-20 to 60 °C)
IP66
Wall mount: Height x width x depth = 28 x 17.5 x 19.6 in. (711 x 445 x 498 mm)
Pipe mount: Height x width x depth = 28 x 17.5 x 26.4 in. (711 x 445 x 671 mm)
Floor mount: Height x width x depth = 60.3 x 17.5 x 24.1 in. (1532 x 445 x 612 mm)
Gas chromatograph (GC) enclosure material: Copper free aluminum coated with industrial grade powder
coat suitable for high humidity and salt-laden environments
Process wetted materials: Stainless steel. Where the function of an item excludes the use of stainless steel
(e.g. glass rotameter tubes), materials that are resistant to corrosion are used.
Electronics: All electronic circuit boards are tropicalized with a clear conformal coating.
Floor-standing (standard), wall, or pipe-mount (optional)
110 lb. (50 kg)
Certifications and approvals
The Rosemount 770XA has the following certifications and approvals.
Refer to the Rosemount 770XA product page for product certificates and approvals.
Follow all safety markings on the analyzer.
Type
EnvironmentOperating temperature
Specifications
■
Thermal conductivity detector (TCD): 0 to 130 °F (-18 to 55 °C)
■
Flame ionization detector (FID): 32 to 140 °F (0 to 60 °C)
■
Micro flame photometric detector (µFPD): 32 to 122 °F (0 to 50 °C)
■
Hazardous area certified: -4 to 140 °F (-20 to 60 °C)
■
0 to 95% relative humidity (non-condensing)
■
Indoor/outdoor
■
Pollution - degree 2 (The gas chromatograph can withstand some non conductive
environmental pollutants, e.g., humidity.)
■
Vibration: Conforms to ASTM D4169
Rosemount 770XA13
Rosemount 770XASeptember 2020
TypeSpecifications
Hazardous area certifications (hardware
dependent)
USA and Canada
■
Class I, Zone 1, Ex/AEx db IIC, Gb T6/T4/T3
■
Class I, Division 1, Groups B, C, and D, IP66
EU ATEX and IECEx
■
Ex db IIC Gb T6/T4/T3
■
Ta = -20 °C to 60 °C
■
SIRA 08ATEX 1328X
■
IECEx SIR 08.0093X
Consult factory for additional product certifications available.
Table 2: Approval Temperature Ratings
T6Basic system no alternative options included
T4Liquid sample injection valve (LSIV) option included
T4Heat trace option with a maximum 176 °F (80 ⁰C) temperature switch setpoint
T3Heat trace option with a maximum 230 °F (110 ⁰C) temperature switch setpoint
14Emerson.com/Rosemount
September 2020
Performance capabilities
Rosemount 770XA
Oven
Valves
Carrier gas
Sample and
calibration gas input
pressure range
Gas input pressures
(maximums)
Detectors
Streams
Gating options
Chromatograms
stored/archived
internally
Airless, maximum 248 °F (120 °C)
Six-port and ten-port diaphragm chromatograph valves. Other types of valves, such as liquid injection or
rotary valves, may be used depending on the application.
Application-dependent. Typically zero-grade helium, nitrogen, or hydrogen.
3 to 30 psig (0.2 to 2.1 bar)
15 psig (1 bar) recommended
Thermal conductivity detector (TCD)
Flame ionization detector (FID)
Micro flame photometric detector (µFPD)
Available in mulitple configurations
Up to 20 externally controlled streams or up to 8 internal (includes calibration stream)
Fixed-time, slope sensing gating of peaks
Stores over 80 days of analysis report data and up to 2,500 individual chromatograms
Electronics
Power
Standard
Optional
Typical power
consumption at
72 °F (22 °C)
Note
Add 15.5 Watts DC (18 Watts AC) for local operator interface (LOI).
24 Vdc at the unit (21 - 30 Vdc)
90 to 264 Vac, 47 to 63 Hz
Start-up: 105 Watts DC (125 Watts AC)
Steady state: 35 Watts DC (40 Watts AC)
Rosemount 770XA15
Rosemount 770XASeptember 2020
Communications (standard)
■
Ethernet: Two available connections - one RJ-45 port and one four-wire terminal with 10/100 Mbps
■
Analog inputs: Two standard input filtered with transient protection, 4-20 mA (user scalable and assignable)
■
Analog outputs: Six self-powered isolated outputs, 4-20 mA
■
Digital inputs: Five inputs, user assignable, optically isolated, rated to 30 Vdc at 0.5 A
■
Digital outputs: Five user-assignable outputs, Form C and electro-mechanically isolated, 24 Vdc
■
Serial: Three termination blocks, configurable as RS-232, RS-422, or RS-485 and one RS-232 D-sub (9-pin) Modbus®/personal
computer (PC) connection
Communications (optional)
Two expansion slots available for additional communications.
Each slot has the capacity to add one of the following:
■
Four analog inputs (isolated) card
■
Four analog outputs (isolated) card
■
Eight digital inputs (isolated) card
■
Five digital outputs (isolated) card
■
One RS-232, RS-422, or RS-485 serial connection card
16Emerson.com/Rosemount
September 2020Rosemount 770XA
Recommended installation
The drawings below represent the minimum recommended installation guidelines for the Rosemount 770XA gas chromatograph.
Please consult Emerson for detailed installation recommendation of your application.
Dimensions are in inches (mm).
Floor mount details
Figure 3: Floor Mount Side and Front Views
Rosemount 770XA17
Rosemount 770XA
Pole and wall mount details
Figure 4: Pole Mount Side View and Wall Mount Side and Front Views
September 2020
A. Pole mount option
B. Wall mounting kit
C. Mounting holes
D. Liquid sample injection valve (LSIV)
18Emerson.com/Rosemount
September 2020Rosemount 770XA
Rosemount 770XA19
00813-0200-3770
Rev. AA
September 2020
AMERICAS
Emerson Automation Solutions
10241 West Little York, Suite 200
Houston, TX 77040 USA
The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount is a
mark of one of the Emerson family of companies. All other marks are the property of their
respective owners.
ASIA-PACIFIC
Emerson
1 Pandan Crescent
Singapore 128461
Republic of Singapore
+65 6 777 8211
+65 6 777 0947
gc.csc@emerson.com
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