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Corrective Action
Possible Cause
Symptom
a. Loosen the union thumbscrew and then
move the union until the silica protrudes
1.0 mm to 2.0 mm beyond the nut.
b. Adjust in increments of 100 V. IonSpray
voltage optimizes over a wide range-from
2200 V to 2400 V.
c. Adjust the value in steps of 5 while
monitoring sensitivity. In general, for
negative mode or high aqueous solvent
composition, set GS1 to 25.
d. Replace the emitter tip. Refer to
®
spray is still unstable, set GS1 to 0. If the
spray is present, but punctuated by air
bubbles, the problem is probably a poor
cut at the spray tip.
e. In general, for peptide work, use a
temperature of 50 °C to 100 °C.
f. Inspect for leaks. Refer to
.
g. Inspect the gas connections on the ion
source interface.
h. Make sure that the rail is in position and
that the thumbscrew is finger-tight.
Check for tiny O-ring inside the rail,
replace if it is damaged.
i. Replace the liquid junction union.
a. The emitter tip is not protruding the
correct length.
b. The IonSpray voltage (IS or ISVF) value
is incorrect.
c. The Ion Source Gas 1 (GS1) value is too
low or too high.
d. The emitter tip is faulty, dirty, or poorly
cut.
e. The Interface Heater Temperature (IHT)
parameter is incorrect.
f. There is a leak in the tubing or
connections.
g. The Gas 1 connection is loose.
h. The high-voltage rail is not in position,
or it is loose.
i. The liquid junction union is patially
clogged, oxidized, or otherwise
suboptimal.
Unstable spray
NanoSpray
®
Ion Source
Operator Guide
71 / 92
RUO-IDV-05-0811-F
Troubleshooting