Chromatographic Performance*

• Retention time repeatability        < 0.008% or < 0.0008 min
• Area repeatability            < 1%RSD
The Agilent 6890N is a state-of-theart gas chromatograph that provides superior performance for all applications. Key to its performance is the use of advanced electronic pneumatic control (EPC) modules and high performance temperature control. Each EPC unit is optimized for its intended use with a specific inlet and detector option. Temperature control of the 6890N oven allows for fast and precise temperature ramping. Overall thermal performance provides optimal chromatography including peak symmetry, retention time repeatability, and retention index accuracy. The combination of precise pneumatic control and accurate temperature control leads to outstanding retention time repeatability, the basis for all chromatographic measurement.

A full array of traditional gas sampling and column switching valves are available. A new highperformance inert pneumatic switching manifold is available for a number of advanced chromatographic applications (2-D heart cutting, detector splitting, etc). Agilent GC systems are known for their reliability, ruggedness, and long life. The Agilent 10-year use guarantee provides greater assurance for a low-cost of ownership throughout its life.

System Capabilities
• Dual channel design supports two inlets and two detectors.
• Full range digital data output enables the smallest and largest peaks to be quantitated in a single run.
• Full EPC is available for all inlets and detectors. Control range and resolution are optimized for the specific inlet or detector module.

• EPC with capillary columns provides four column flow control modes: constant pressure, ramped pressure (3 ramps), constant flow, or ramped flow (3 ramps). Column average linear velocity is calculated.
• Atmospheric pressure and temperature compensation is standard, so results do not change, even when the laboratory environment does.
• Automatic Liquid Sampling is fully integrated into mainframe control.
• Set point and automation control can be done from the local keyboard or via a networked data system. Clock-time programming can be initiated from the front panel to initiate events (on/off, method start, etc) at a future date and time.
• A run time deviation log is created for each analysis to ensure that all method parameters were achieved and maintained.
• Display of all GC and automatic liquid sampler (ALS) set points at the GC or data system. Agilent supports open connectivity by providing communication
protocols to other vendors.

Column Oven
• Dimensions: 28 × 31 × 16 cm. Accommodates up to two 105 m × 0.530 mm id capillary columns or two 10-ft glass packed columns (9 in coil diameter, 1/4 in od), or two 20-ft stainless steel packed columns (1/8 in od).
• Operating temperature range suitable for all columns and chromatographic separations. Ambient temperature +4 °C to 450 °C. - With LN2 cryo cooling:
80 to 450 °C. - With CO2 cryo cooling: 40 to 450°C.
• Temperature set point resolution: 1 °C.
• Supports 6 oven ramps with 7 plateaus. Negative ramps are allowed.
• Maximum achievable temperature ramp rate: 120 °C/min (120 V units are limited to 75 °C/min, see Table 1).
• Maximum run time: 999.99 min (16.7 h).
• Oven cool down (22 °C ambient) 300 °C to 50 °C in 4.5 min).
• Ambient temperature rejection: < 0.01 °C per 1 °C.
•Support for up to 8 valves. - Valves 1-4, 12 V DC 13 watt in a heated valve box - Valves 5-6, 24 V DC 100 mA unheated, for low power valve appliations - Valves 78, externally powered as a remote event from separate contact closure
• Independent heated zones, not including oven: six (two inlets, two detectors, and two auxiliary).
• Maximum operating temperatures for auxiliary zones: 400 °C. Electronic Pneumatics Control (EPC)
• Atmospheric pressure compensation sensor to compensate for altitude and ambient temperature variation is standard.
• Pressure may be adjusted by increments of 0.01 psi.
• Pressure/Flow ramps: Three maximum.
• Carrier and makeup gas settings selectable for He, H2, N2, and argon/methane.
• Flow or pressure setpoints for each inlet or detector parameter with both Agilent 6890N and Agilent ChemStations.
• Automated carrier has constant flow, when capillary column dimensions are entered into the 6890.
• Split/Splitless, PTV inlets have flow sensors for the control of split ratio.
• Inlet modules Pressure sensors: Accuracy: