Operation 4
Installation and Operation Guide 45
Calculate MSD restrictor flow
The flow through the MSD restrictor (Figure 22) at 280 °C is:
The flow to the MSD at 280 °C is 2.65 mL/min. This flow is higher than the
minimum 0.72 mL/min suggested for helium in 0.18-mm id tubing. The
calculated makeup flow is then [0.88 + 2.65] – 1.38 = 2.15 mL/min. This should
work well.
The configuration can now be installed and used.
Figure 22 MSD restrictor flow calculation
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