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4.3 Insulation (against extreme heat/cold)
Magtech strongly recommends that an experienced
Magtech Technician do insulation of the magnetic
level gages at the factory with externally mounted
transmitters.
If Cryogenic “Hard Skin” cold service type
insulation is required, it must be done at the
factory due to the custom “TUBE in TUBE”
design necessary for removal of the
transmitter if needed.
If insulation is going to be done in the field, then the
following guidelines MUST be followed:
1. Flexible type insulation jackets (NOT HARD
SKIN) are required and must be installed around
the mag-gage chamber only. DO NOT cover the
LTM sensor tube, as this may burn up the
sensor and possibly the electronics.
2. After the insulation jacket is installed, the LTM
sensor tube must be remounted at its factory-
preset distance from the mag-gage chamber
and must be parallel to the chamber as well
(small cut-outs in the jacket are required to re-
attach the transmitter properly).
3. Make sure that the 0% and 100% (4/20mA)
marking on the sensor tube are re-aligned at
the centers of the process connections.
(When insulating gages):
Magtech level transmitters have a maximum
operating temperature of 300 F. When insulating a
mag-gage and transmitter assembly in HOT service,
keep the transmitter OUTSIDE the insulating
material. Special blankets for this type of insulation
are available from Magtech, and recommended to
guarantee proper insulation. For further
information consult the factory.
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