System Description
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4.10 Changing a Probe
If the probe is to be changed, the procedure below should be followed. Probes are fragile and
expensive, so you should check with the system manager before attempting to change the
probe. The magnet, and in particular eddy currents, greatly affect the mechanical motion of
the probe. As you remove the probe from the magnet expect it to accelerate suddenly as it
reaches the lower end of the magnet bore. Also be prepared for some resistance when you
place the probe into the magnet.
Procedure for Changing a Probe:
1. Ensure that no acquisition is running by clicking the STOP button in the upper toolbar of
the TopSpin window or entering stop in the command line.
2. Turn off any heating or cooling from the system. Use the ’edte’ command to switch off
the heater. Allow the probe to settle to room temperature. Do not shut off the system itself!
3. Remove the air/N
2
connection which is attached to the base of the probe.
4. After making sure that the magnet bore is not plugged, remove any sample that may be
present in the magnet by activating the LIFT button in the BSMS window.
5. Turn off the LIFT.
6. Disconnect all BNC cables from the probe base.
7. Disconnect the thermocouple, heater and any other gradient or PICS connection.
8. Using the attached screwdriver, loosen the two screws which secure the probe in the
magnet.
9. Lower the probe straight down and out of the magnet.
10. Insert the new probe and secure using the two screws.
11. Reconnect the coaxial cables, thermocouple, heater, cooling lines and any other
connections as appropriate.
12. Turn the heater back on.
A movie showing this procedure is available on the Bruker website.
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