Probe Shaft; Probe Tip; Sample Cups - Thermo Scientific DSQ Series User Manual

Probe Shaft

Probe Tip

Sample Cups

Thermo Scientific
In the temperature-programmed mode, the DIP is programmed to heat at a specified rate (or
gradient). The probe ramps at this rate until the final temperature is reached. The DIP can be
programmed to heat in 10 °C/min increments up to a maximum rate of 100 °C/min.
Use the temperature-programmed mode for:
• Observing the evaporation of different components of the sample as a function of
temperature
• Creating a longer lasting signal from the sample to allow more complete characterization
The probe shaft is a long metal rod attached to a cylindrical handle. It measures approximately
17-in. long and 0.531-in. in diameter. Electrical cabling and coolant gas lines pass through the
probe shaft from the cable connection in the handle to the probe tip.
At the end of the probe shaft is the probe tip, which has a spring-loaded holder into which the
sample cup is inserted. The probe tip seals against the outer surface of the ion volume holder.
This positions the sample cup in front of the ion volume. As the probe tip is heated by a
coiled heater, its temperature is measured by an RTD (resistive temperature device). The DIP
temperature is controlled through circuitry located in the DPC, which precisely regulates the
probe tip temperature during the heating cycle. After a heating cycle, a solenoid is
automatically activated, and compressed air or nitrogen flows through the probe tip. This
rapidly cools the probe tip. The coolant is not designed for subambient operations or for use
with condensable cooling gases. The operating range of the DIP is from ambient to 450 °C.
However, once inserted into the ion source, the DIP tip begins heating from the radiant heat
of the ion source. For volatile samples, it may be necessary to start the mass spectral analysis
with the DIP inserted just slightly away from the ion source, then gently insert into the ion
source and begin temperature programming.
Sample cups are small glass vials. A sample is introduced into a sample cup. Then, the sample
cup is inserted into a spring-loaded holder in the probe tip. The DIP is inserted through the
inlet valve and into the ion source. The DIP uses 9-mm (0.35-in.) one-piece Pyrex sample
cups for standard DIP operations.
1
Using a Direct Insertion Probe (DIP)
Ion Trap and DSQ Series Direct Probe System User's Guide
Top Terms To Know
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