Emerson Transmitter 350 Mode D’Emploi

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.