94 5977 Series MSD Operation Manual
4 Operating in Chemical Ionization (CI) Mode
N/A Not available
Table 15 Reagent gas settings
Reagent gas Methane Isobutane Ammonia EI
Ion polarity Positive Negative Positive Negative Positive Negative N/A
Emission 150 A 50 A 150 A 50 A 150 A 50 A 35 A
Electron
energy
150 eV 150 eV 150 eV 150 eV 150 eV 150 eV 70 eV
Filament 1
11111 1 or 2
Repeller 3 V 3 V 3 V 3 V 3 V 3 V 30 V
Ion focus 130 V 130 V 130 V 130 V 130 V 130 V 90 V
Entrance
lens offset
20 V 20 V 20 V 20 V 20 V 20 V 25 V
EM volts 1200
1400 1200 1400 1200 1400 1300
Shutoff valve Open Open Open Open Open Open Closed
Gas select A ABBBB None
Suggested
flow
20% 40% 20% 40% 20% 40% N/A
Source temp 250 °C
150 °C 250 °C 150 °C 250 °C 150 °C 230 °C
Quad temp 150 °C 150 °C 150 °C 150 °C 150 °C 150 °C 150 °C
Interface
temp
280 °C 280 °C 280 °C 280 °C 280 °C 280 °C 280 °C
Autotune Yes
Yes N o Yes N o Yes Ye s
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