6 Operating in CI Mode
Operating the CI MS
7000/7010 Series TQ GC/MS Operating Manual 131
Operating the CI MS
Operating your GC/MS in the CI mode is slightly more complicated than
operating in the EI mode. After tuning, gas flow, source temperature, and electron
energy may need to be optimized for your specific analyte. (See Table 9.)
Start the system in CI mode
When starting up the system, you may begin in either PCI or NCI mode.
Depending upon the application, use the following reagent gas flowrates during
system startup:
• PCI mode set reagent gas flow to 20 (1 mL/min)
• NCI mode set reagent gas flow to 40 (2 mL/min)
Table 9 Temperatures for CI operation
Ion source Front analyzer Rear analyzer GC/MS interface
PCI 300 °C 150 °C 150 °C 280 °C
NCI 150 °C 150 °C 150 °C 280 °C
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