Thermo Scientific Vanquish VF-D20, Operating Manual, Page: 53 / 182

5 • Installation
Vanquish Charged Aerosol Detectors Operating Manual Page 53
NOTICE—Gas Specifications
The requirements and specifications for the gas supplied to the detector
have major impact on the detector performance. Observe the following
notes:
• If the gas supply pressure is varying or dropping below the specified
pressure range, it can impair the performance of the detector or
even damage the detector.
•
Non-volatile hydrocarbons, such as compressor oils, in the gas
supplied to the detector can cause permanent damage to the
detector.
•
If the supply gas is contaminated with particles (size ≥ 0.1 µm), water
vapor or other non-volatile substances, it can impair the
performance or even damage the detector.
• Observe all requirements and specifications for the supply gas in this
manual to avoid damage to the detector.
• The gas supply and the gas supply pressure for the detector must
meet the gas specifications in
section 9.1 Performance
Specifications, page 164 .
•
Make sure that the gas supply is regulated to a stable gas pressure
that is within the specified gas pressure range.
•
The gas supplied to the detector must be either air or nitrogen. Do
not use helium or other supply gases.
• Nitrogen gas (typically ≥ 95% nitrogen purity) is recommended for
most applications. Air may be used when working with mobile
phases of low combustibility.
• With highly combustible mobile phases, such as tetrahydrofuran
(THF) and other ethers and ketones, use nitrogen as supply gas.