WATERS CORPORATION 2424, Operator'S Manual, Page: 83 / 196

Setting up a run 3-19
2. To toggle between Heating %, Cool, and Off, press CE when the “set”
field is active:
a. If you selected Heating %, you must specify the nebulizer heater
power level setting in the set field. You can now view any nebulizer
temperature changes in the “cur. temp” field.
b. If you selected Cool, thereby turning on the nebulizer cooler, you
cannot enter any values in the “set” field. However, you can view
any nebulizer temperature changes in the “cur. temp” field.
Tip:
The Cool setting is the default.
c. If you selected Off, both the nebulizer heater and cooler are turned
off.
3. Specify the drift tube heater temperature in the “set” field.
Setting the gain and gas pressure
The gain setting controls the full-scale sensitivity of the detector by defining
the gain factor from 1 to 1000. Each gain setting relates linearly with the
actual light-scattering signal. The gas pressure setting monitors the condition
of gas flow through the nebulizer. For the high-flow and low-flow nebulizers,
the maximum gas pressure to 410 kPa (4.1 bar, 60 psi).
Warning:
The flash point is the lowest temperature at which a
flame can propagate through the vapor of a combustible material
to its liquid surface. A chemical’s flash point is determined by the
vapor pressure of the liquid. Only when a sufficiently high
concentration is reached, can a solvent vapor support combustion
(see page 6-4 for the flash points of common solvents).
Caution:
To avoid flooding the nebulizer and detector, Waters
recommends leaving the nebulizer gas flowing, at full or reduced rate,
when the mobile phase pump is shut down or the solvent flow is set to
zero.