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7
•
Maintenance and Service
7.4
Routine and Preventive Maintenance
7.4.1
Maintenance Plan
7.4.2
Flushing the Detector Between Analyses
Page 124
Optimum device performance, maximum uptime of the device, and
accurate results can be obtained only if the device is in good condition
and properly maintained.
Perform the maintenance procedures in the table on a regular basis. The
frequency given in the table is a suggestion. The optimum frequency for
maintenance depends on several factors, such as the types and amounts
of samples and solvents used with the device.
Frequency
Daily
Regularly
Annually
TIP The Chromeleon software supports functions for estimating the
lifetime of consumables (see
Observe the following guidelines to prevent build-up or accumulation of
residue from the mobile phase, sample matrix and analytes within the
detector between the analyses. This helps maintain consistent response,
optimum performance and reduced detector downtime:
•
Periodically flush the detector with the detector gas flow being
turned on. When using buffer solutions and other additives, it is
recommended to flush the detector daily using compatible solvents
that do not contain additives.
•
Use the solvent with the best solubility characteristics for the sample
matrix and analyte(s) of the analytical method in question.
What you should do...
•
Inspect the flow connections for signs of leakage or
blockage.
•
When you use buffers or salt solutions, flush the device
thoroughly after use with an appropriate solvent that
does not contain buffers or salts.
•
Water or highly aqueous (< 5% organic modifier) mobile
phases are highly susceptible to microbial growth.
Prepare such mobile phases freshly on a daily basis.
•
Inspect the flow connections for damage, such as cracks,
nicks, cuts, or blockage.
•
Check that all warning labels are still present on the
device and clearly legible. If they are not, contact Thermo
Fisher Scientific for replacement.
•
Have Thermo Fisher Scientific service personnel perform
preventive maintenance once a year.
Predictive Performance
Charged Aerosol Detectors (VH-D20, VF-D20)
(} page 127)).
Operating Manual
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