Agilent Technologies 5973N, Hardware Installation

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44 Hardware Installation
Installation
Familiarizing the Customer
Follow the “Customer Familiarization Checklist" on page 53.
Important points about the CI MSD to cover include:
• Cleanliness is the most important factor for success in CI,
especially negative mode. This includes air leaks, water, and
residual PFDTD calibrant.
•
NCI reagent gas setup:
There are no negative reagent ions formed. To set up for NCI
mode, tune in PCI mode, then load NCI tune file to switch
parameters, set gas flow to 40%; adjust if necessary for
specific analyte.
• NCI operation:
Reagent gas flow, source temperature, and emission current
are the three most important parameters for optimizing NCI.
• No PFDTD calibrant ions are formed in PCI with isobutane or
ammonia. Tune with methane, and copy parameters to new
file: e.g., PCINH3.U.
• The gas purifier can not be used with ammonia.
• Must ballast foreline pump daily if running ammonia. Refer
to the maintenance chapter of the 5973 inert MSD Hardware
Manual.
• For updated information, see the Agilent Technologies web
site at http://www.agilent.com/chem.