WATERS CORPORATION 2424, Руководство оператора, Страница: 82 / 196

3-18 Operating the Detector
Setting the nebulizer and drift tube temperature
The nebulizer cooler cools the nebulizer tube wall providing a cold surface for
mobile phase eluent droplets to condense and flow to waste. This reduces the
amount of solvent that is sprayed into the drift tube in the vaporization
process and allows the drift tube temperature to run lower, therefore
increasing the sensitivity of semi-volatile samples.
The nebulizer heater, which is regulated by a heater power level setting, is
located in the same oven as the drift tube heater. The nebulizer heater allows
preheating of the sample solution to the set heater power level via a resistive
heat wrap that surrounds the nebulizer tube.
From the Nebulizer and Drift Tube Temperature Control Home screen, you
control the nebulizer heater, nebulizer cooler, and drift tube heater
temperature independently.
Tips:
• The drift tube temperature must be sufficiently high to remove all
solvent; otherwise, detector noise occurs.
• Too high a drift tube temperature can vaporize the sample and cause
loss of sensitivity.
• The nebulizer temperature must be at least 5
°
C below the drift tube
temperature.
To set the nebulizer and drift tube temperature
1. Press Temp
°
C.
Result:
The Nebulizer Heater/Cooler and Drift Tube Heater
Temperature Control Home screen appears.
Nebulizer and Drift Tube Temperature Control Home screen