Air
A compressed air gas supply that is capable of providing up to 2L/min regulated to 80 psi is
required for negative ESI as a nebulizing gas. It is the customer's responsibility to conform to all
regulations regarding the installation and operation of the gas system. The air should be clean
and dry, with less than 0.1 ppm total hydrocarbons, including methane, and a –40 degree dew
point.
CI Reagent Gases
The CI mode for the 1200L MS typically uses methane, isobutane, or ammonia. The amount of
gas consumed during CI operation is approximately 1 to 2 mL/min. The CI reagent gas should
contain less than 1 ppm water. The methane, isobutane, or ammonia gas supply line connects
directly to the CI gas inlet using 1/8” Swagelok fittings.
Before evacuation, new gas lines typically contain significant amounts of adsorbed water vapor.
The longer the gas line, the greater the pumping time required to evacuate the water from the
line. To minimize pumping time, we recommend that the line be as short as possible.
Methane 5.0 Research Grade (99.999% purity)
A two-stage, 0
−
15 psi (0
−
1 bar) pressure regulator that has a stainless steel diaphragm is
recommended. The output pressure to the 1200 MS should be set to 3
−
5 psi (0.2
−
0.3 bar). Gas
lines for methane should be made of stainless steel. All gas lines should be free of oil and
preferably flame treated or solvent washed.
Isobutane 5.0 Research Grade (99.999% purity)
A two-stage, 0
−
15 psi (0
−
1 bar) pressure regulator that has a stainless steel diaphragm is
recommended. The output pressure to the 1200 MS should be set to 3
−
5 psi (0.2
−
0.3 bar). Gas
lines for isobutane should be made of stainless steel. All gas lines should be free of oil and
preferably flame treated or solvent washed.
Ammonia 5.0 Research Grade (99.999% purity)
A two-stage, 0
−
15 psi (0
−
1 bar) pressure regulator that has a stainless steel diaphragm is
recommended. The output pressure to the 1200 MS should be set to 3
−
5 psi (0.2
−
0.3 bar). Gas
lines for ammonia should be made of stainless steel. All gas lines should be free of oil and
preferably flame treated or solvent washed.
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1200/1200L MS Pre-installation Instructions
