Page 7 - Shimadzu GC-2010 Pro
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Constant linear velocity mode quickly determines separation conditions



             The constant linear velocity mode related to the separation performance is recommended for the carrier gas control and
             can obtain the optimum separation conditions in the shortest time compared with the previous control method by setting
             the column inlet pressure and flow.
             Constant column inlet pressure
                                                                             [Conditions of Analysis]
 Rapid oven heating / cooling  1.Pencycuron                                  Column: SH-Rtx column 30m X 0.32mm i.d.df=0.25  m
              2.Benfluralin
                                                                             Column temperature: 60℃(1 min)-7℃/min-230℃
              3.Propyzamide                                                  Injection port temperature: 240℃
              4.Diazinon                                                     Detector temperature: 270℃ (FID)
              5.Fenitrothion（MEP）                                            Carrier gas: He
                                                                             Carrier gas linear velocity: 40cm/sec, column inlet pressure 44.0kPa
 GC-2010 Pro incorporates a double-jet cooling system, which enables the reduction of cooling time from 450℃ to 50℃   6.Chlorpyrifos  Injection volume: 1  L (splitless analysis)
 in 3.4min, realizing more efficient and rapid cooling. In addition, with the ability of rapid heating, GC-2010 Pro can
 significantly reduce the analysis time.
 Column oven temperature (℃)  Constant linear velocity
 450
 Large fan rapidly   1.Pencycuron
 discharges hot air  400  2.Benfluralin
 350  GC-2010  3.Propyzamide
 GC-2010 Pro
 Pro
 300          4.Diazinon
              5.Fenitrothion（MEP）
 250
 Small fan added to   Significant reduction   6.Chlorpyrifos
 enhance efficiency of   200  of cooling time
 cooling air intake  150
 100
 3.4 min
 50
            Comparison of chromatograms with constant linear velocity and constant column inlet pressure
 0
 0  1  2  3  4  5  6               (Pesticides analysis)
 Time (minutes)
 Double-jet cooling system
             Gas saver function reduces helium consumption
            Reducing running cost by gas saving is an important issue in GC operation. GC-2010 Pro reduces gas consumption by
            decreasing of split ratio after injection as well as automatic shutdown functions after finishing all analysis.
 24 min  Approx. 4.7 min  3 min

 Cooling  Equilibrium  To next analysis  Split flow (mL/min)                         2500
 time        200                                                                    2000

 Analysis case: organic compound analysis with GC-2010  Carrier gas  Carrier gas    1500          Reduced by about
                   savings  Carrier gas savings  savings  Carrier gas savings
 Total analysis time: 31.7min                                                      Helium consumption [mL]  1000  83%
              20
                0  Analysis  Analysis       Analysis  Analysis      Time             500
               Start            Finish  Start    Maintain the carrier gas saving mode   0
 Approx.                                         after analysis and during stand-by       Unused  Use the carrier gas
                                                                                                    saver function
 12.5 min  2.7min  3 min
                               Carrier gas saver function example             Analysis time: 30min  split ratio: 100
 Cooling  Equilibrium  To next analysis                                       Carrier gas saver function: split ratio 10 one minute later
 time  time                                                                   Column temperature: 170℃
            In this example, the split flow is set to 200mL/min only upon injection and in the remaining time,   Chromatographic column: inner diameter 0.25mm
                                                                              length 30m film thickness 0.25 m
            the split ratio is reduced to 20mL/min to save carrier gas consumption. The carrier gas saving
 Analysis case: organic compound analysis with GC-2010 Pro
 Analysis cycle time reduced by about 13.5  min  mode is maintained after the end of batch processing analysis until the beginning of the next   Comparison of helium consumption for one analysis
 Total analysis time: 18.2min  batch processing analysis.                     using and not using carrier gas saver function

                                                                                               GC-2010 Pro
 6                                                                                                 Capillary Gas Chromatograph  7
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