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Kenco - 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.
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.
- Level And Interface Detection
- Flow Detection For Liquids and Gasses
- Fast Response Time
- No Moving Parts
- Temperature Compensation
- Application Flexibility
- Better Process Control
- Reliability
- Stability And Repeatability
Applications:
- Level Detection
- Nitrogen Flow Detection
- Low Flow Monitoring
- Liquid-Liquid Interface Detection
- Foam-Liquid Interface Detection
- Pump Protection
- Flare Systems
Industries:
- Chemical
- Petroleum
- Water/Wastewater
- Pharmaceutical
- Pulp & Paper
- Power
- Aerospace