Evaporation Temperature - Thermo Scientific VH-D20 Operating Manual

6 • Operation

6.10.5 Evaporation Temperature

How to optimize the evaporation temperature
Page 110
The temperature-controlled evaporation tube dries the aerosol droplets
that come from the spray chamber. The evaporation tube evaporates
the more volatile components in the mobile phase to produce dried
particles composed of non-volatile analyte and background residue.
The efficiency of the drying procedure depends on the set temperature.
Additional factors, such as the mobile phase composition, the pump flow
rate and the sample composition, also play an important role.
Note the following when selecting an evaporation temperature:
• As a standard, the Evaporator Temperature Nominal is set to 35 °C.
• When selecting a different evaporation temperature, observe the
evaporation temperature specification for the detector. See
Performance Specifications
• Changes in the evaporation temperature affect the response of the
detector.
• When the temperature was changed, the evaporation tube requires
time to equilibrate. The Wait For Temp Ready parameter makes
sure that the detector is only ready for analysis when the
evaporation tube is equilibrated.
If the parameter is disabled, it is recommended to wait
approximately 30 minutes before you start sample analysis.
• Perform three or more injections of a reference standard for the
analytical method for which you want to optimize the evaporation
temperature.
• Use a different evaporation temperature setting for each reference
injection, ranging from low to high temperature. Select the most
appropriate setting as starting point. See the Guidelines for selecting
the evaporation temperature below.
TIP Using performance metrics such as the precision and sensitivity of
the detector can help to receive the optimal evaporation temperature.
(} page 170).
Charged Aerosol Detectors (VH-D20, VF-D20)
Operating Manual