*   突破性的微板流路控制技术实现了柱箱内可靠的无泄漏连接，提高了工作效率和数据完整性，为复杂的GC分析提供了通用、可靠的解决方案 
*   安捷伦仪器监测和智能诊断软件可跟踪配件的使用情况，监测拖尾峰(tailing peak)。前者少见。>色谱峰形变化，在问题发生之前提醒您进行处理 
*   每个分流/不分流 （SSL进样口）都采用了新的方便的扳转式顶盖设计，使您能在30秒内更换进样口衬管 - 无需特殊的工具或培训 
*   品种齐全的选件和附件使您能够配置恰好满足您实验室目前需求的系统, 并能方便地进行升级，以满足不断变化的应用和分析通量的需求 
*   强大的、操作界面友好的GC软件简化了方法设置和系统操作，缩短了培训时间；您可选择正好符合您实验室需求的软件包 
*   在品质卓越的6890进样口, 检测器和GC柱箱上建立的分析方法, 您可以完全放心地将其转移到7890A GC上 
*   其它功能和详细信息请参看仪器样本和资料库中的技术规格文件

time monitoring of the GC when it is connected with Lab Monitor & Diagnostic Software, even when also connected to a data system.
• One-button access to maintenance and service modes from the keyboard
• Preprogrammed leak tests
• 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.
• A full array of traditional gas sampling and column switching valves are available
• 550 timed events
• Display of all GC and ALS set points at the GC or data system.
• Context-sensitive online help 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 cryogenic cooling: –80 to 450 °C.
- With CO2 cryogenic cooling: –40 to 450 °C.
• Temperature set point resolution: 1 °C.
• Supports 20 oven ramps with 21 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) 450 to 50 °C in 4.0 min (3.5 min with oven insert accessory).
• Ambient rejection: < 0.01 °C per 1 °C.
Electronic Pneumatics Control (EPC)
• Compensation for barometric pressure and ambient temperature changes is standard.
• Pressure set points may be adjusted by increments of 0.001 psi, with typical control ± 0.001 for the range 0.000 to 99.999 psi; 0.01 psi for the range 100.00 psi to 150.00 psi
• User may select pressure units as psi, kPa, or bar.
• 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 7890A and Agilent ChemStations.
• Constant flow mode is available when capillary column dimensions are entered into the 7890A.
• Split/splitless, and PTV inlets have flow sensors for the control of split ratio.
• Inlet modules Pressure sensors: Accuracy: <± 2% full scale, Repeatability: <± 0.05 psi, Temperature coefficient : <± 0.01 psi/°C, Drift: <± 0.1 psi/6 months.
• Flow sensors: Accuracy: <± 5% depending on carrier gas, Repeatability: <± 0.35% of setpoint, normalized temperature and pressure (NTP)* per °C for He or H2; <± 0.05 mL/min NTP per °C for N2 or Ar/CH4.
• Detector modules: Accuracy: <± 3 mL/min NTP or 7% of setpoint, Repeatability:
<± 0.35% of setpoint *NTP = 25 °C and 1 atmosphere
Inlets
• Maximum of two inlets installed
• EPC compensated for atmospheric pressure and temperature variation
• Inlets available:
- Packed purged injection port (PPIP)
- Split/splitless capillary inlet (S/SL)
- Temperature-programmable cool on-column (PCOC)
- Programmable temperature vaporizer (PTV)
- Volatiles inlet (VI)
S/SL
• Suitable for all capil