4

L E V E L

S W I T C H

Level or Interface can be detected due to differences in

thermal conductivity. High or low level alarm applica-

tions may be installed either vertically or horizontally.

In the absence of media, the self-heated sensor tip cre-

ates a temperature difference between the two sensors.

As media contacts the sensor tip, heat is absorbed by the

fluid, decreasing the temperature difference.

F L O W

S W I T C H

Flow is detected by an increase in heat transfer that

occurs as the flow rate increases. Exceptional low flow

sensitivity is obtained with no moving parts. The same

unit can be used for both liquid and gas flow detection.

In a low flow condition, the self-heated sensor tip cre-

ates a temperature differential between the two sensors.

As flow increases, heat is dissipated and temperature

difference decreases.

No Flow

Flow

Low Level

High Level

A P P L I C A T I O N S

THERMATEL has demonstrated reliable performance as a flow or level switch. For use as a flow switch,

THERMATEL can be used to detect either a high flow or a low flow condition for both gases and liquids.

As a level switch, THERMATEL can be used to detect difference in thermal conductivity of various media.

This includes interface detection between media such as liquid/foam, and oil/water.