L-770HP--E
5.7 Heat Insulation Work
In applications where the process fluid is of low or high temperatures, only the sensor unit should be heat
insulated. Do not insulate the adapter and terminal box. We recommend simple sensor lagging to facilitate
inspection and maintenance. Exclude the transmitter electronics.
() Careful attention should be paid to the maximum permissible temperature when steam trace is applied.
Maintain the tracing temperature around that of the process fluid (see General Specifications).
() If steam, warm water or oil is used, secure by spot welding the copper tubing, or of other material, to the
sensor unit when you spirally wrap the tubing around the sensor unit (Fig. .).
NOTE: To minimize transmission of oscillation to the sensor, the spirally wrapped copper tubing should
start and end at locations as close to the connector as possible (see Fig. .).
CAUTION:
Do not use electric heaters which can be a source of noise.
Fig. . Heat Retention Work
Copper
Tubing
Sensor Unit
Tubing
Spot Weld
Tube Retainer
(Material: SUS sheet)
Terminal Box
