Adjust the Position of the Corona Discharge Needle
WARNING! Electrical Shock Hazard. Follow this procedure to avoid contact
with the high voltages applied to the corona discharge needle, curtain plate,
and turbo heaters.
Required Materials
• Insulated flat-bladed screwdriver
When using the APCI probe, make sure that the corona discharge needle is pointing toward the
aperture. When using the TurboIonSpray probe, make sure that the corona discharge needle is
pointed away from the aperture.
1. Use an insulated flat-bladed screwdriver to rotate the corona discharge needle adjustment
screw on the top of the needle.
2. Look through the glass window to make sure that the needle is aligned with the tip facing
the aperture.
Optimize the APCI Probe Position
WARNING! Ionizing Radiation Hazard, Biohazard, or Toxic Chemical
Hazard. Make sure that the electrode protrudes beyond the tip of the
probe, to prevent hazardous vapors from escaping from the source.
The electrode must not be recessed within the probe.
WARNING! Puncture Hazard. Be careful when handling the electrode. The tip of the
electrode is extremely sharp.
Make sure that the curtain plate aperture remains clear of solvent or solvent droplets at all times.
The position of the sprayer nozzle affects sensitivity and signal stability. Adjust the probe
position in small increments only. At lower flow rates, move the probe closer to the aperture. For
higher flow rates, move the probe farther away from the aperture. After the probe is optimized,
it needs only minor adjustment. If the probe is removed, or if the analyte, flow rate, or solvent
composition changes, then repeat the optimization procedure.
Ion Source Optimization
SCIEX 3200 Systems
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System User Guide
RUO-IDV-05-6475-C
