HP 5973, Hardware Installation Manual

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Installation
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Familiarizing the customer
Follow the Customer Familiarization checklist.
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:
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 MSD CI manual.