Agilent Technologies 7010 Series User Manual

6 Operating in CI Mode
CI Autotune
7000/7010 Series TQ GC/MS Operating Manual 135
CI Autotune
After the reagent gas flow is set, the lenses and electronics of the MS should be
tuned. (See Table 11.) Perfluoro-5,8-dimethyl-3,6,9-trioxidodecane (PFDTD) is
used as the calibrant. Instead of flooding the entire vacuum chamber, the PFDTD
is introduced directly into the ionization chamber through the GC/MS interface
by means of the gas flow control module.
There are no tune performance criteria. If CI autotune completes, it passes.
EMV at or above 2600 V, however, indicates a problem. If your method requires
EMV set at +400, you may not have adequate sensitivity in your data acquisition.
CAUTION
After the source is changed from EI to CI or vented for any other reason, the MS
must be purged and baked out for at least 2 hours before tuning. Longer
bakeout is recommended before running samples requiring optimal sensitivity.
CAUTION
Always verify MS performance in EI before switching to CI operation.
Table 11 CI tune default settings
Parameter Methane Isobutane Ammonia
Ion polarity Positive Negative Positive Negative Positive Negative
Emission 150 µA 50 µA 150 µA 50 µA 150 µA 50 µA
Electron energy 150 eV 150 eV 150 eV 150 eV 150 eV 150 eV
Filament 111111
Repeller 3 V3 V3 V3 V3 V3 V
Ion focus 130 V 130 V 130 V 130 V 130 V 130 V
Entrance lens offset 20 V 20 V 20 V 20 V 20 V 20 V
EM volts 1200 1400 1200 1400 1200 1400
Shutoff valve Open Open Open Open Open Open
Gas select A A B B B B
Suggested flow 20% 40% 20% 40% 20% 40%
Source temp 250 °C 150 °C 250 °C 150 °C 250 °C 150 °C

Agilent Technologies 7010 Series Specifications

General

Brand	Agilent Technologies
Model	7010 Series
Category	Laboratory Equipment
Language	English