Nor-Cal MLR-MLRC Series - Manual (Page 4)

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Bakeout Procedure:
********** WARNING *********
HIGH MAGNETIC FIELDS. DO NOT PUT YOUR FINGERS BETWEEN THE MAGNET ASSEMBLY AND MAGNETIC MATERIALS.
ALWAYS WEAR SAFETY GLASSES WHEN AROUND EXPOSED RARE EARTH MAGNETS
Magnet assembly removal will expose the rare earth magnets. If a magnet chips, such as during handling, the chip particle may be expelled
at high speed by the field. Although the particle may be small, it does pose a danger of eye damage. DO NOT DROP THE MAGNET
ASSEMBLY.
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DANGER
HIGH MECHANICAL FORCES
Remember these magnets are strong, and generate significant force. De-coupling and re-coupling can cause forceful movement of the mag-
net assembly and/or the probe. Take appropriate precautions.
Enclose the magnet assembly in an appropriate container (cardboard box, etc) or wrap in suitable foam packaging. This will safeguard
against magnet damage and the possible resultant chip expulsion.
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The external magnet assembly must be removed for bakeout. Remove the outer travel stop and slide the assembly off the end of the
feedthrough.
********** WARNING *********
Removal of the magnet assembly will release the inner bearing carrier and probe assembly. The probe assembly is mounted with ball bearings and has a low
coefficient of friction. If the assembly is tilted probe down, the probe assembly will extend without control, making contact with whatever is in its path. DO NOT
ALLOW THIS SITUATION TO OCCUR. Equipment damage may occur depending upon the situation.
Magnet keepers are not required for the rare earth magnets. Do re-assemble whenever not baking. After re-coupling, 80% of the maximum force will be
exhibited by the assembly. A “soak” time of 24 hours will return maximum coupling force.
NOTE:
These rare earth magnets will loose approximately 1.5% of their strength per year at room temperature when not coupled with the probe assembly.
With magnets removed, we recommend continuous bakeout temperatures up to 200 degrees C for maximum service life. If necessary, the feedthrough can
withstand higher temperatures (up to 300oC), but we do not recommend it. Higher temperatures over extended periods of time may cause/accelerate “creep”
or warpage of the ground tubing, especially on longer stroke and cantilever mounted units. This in turn can cause drag, rough operation, and perhaps eventual
failure of operation.
The auxiliary support must be in place during bakeout (see “installation” section).
Automatic temperature control with the sensor(s) correctly located in the top of the area being heated is highly recommended.
We at Nor-Cal Products have a large stake in your new equipment operating up to your expectations. If you experience difficulty with this unit, or
any other aspect of your endeavor where our experience might be of value, we want to hear from you. We want to be part of your success.