Kenco Engineering Products
Kenco Thermal Differential Level & Flow Switches
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Thermal Differential Level & Flow Switches
KENCO's Thermal Differential Switches are designed for a wide range of flow and level applications. These switches can be used to direct either the overall liguid level or a liquid-liquid interface. They can also be used to detect a specific flow rate or flow/no flow condition in liquids and gasses.
Principle Of Operation:
The sensor consists of (2) Resistance Temperature Detectors (RTD's). One RTD measures the temperature of the fluid around the sensor. The other RTD is self-heated. This provides a temperature differential between the the two RTD's.
In a level application, the thermal conductivity of the liquid level is higher than the gaseous layer above the liquid. When the RTD's make contact with the liquid, there is a cooling effect with the liquid absorbing the heat from the heated RTD. This reduces the temperature differential increases, causing the relay to reset. This will also work in a liquid-liquid interface when the two liquids have different thermal conductivity (ex. oil and water).
In a flow application, there is a temperature differential during a no-flow or low-flow condition (the actual setpoint is adjusted during the calibration procedure). As the flow rate increases, the temperature between the RTD's decreases, causing the relay to change state. When the flow rate decreases, the temperature differential increases, causing the relay to reset.
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