FineTek SP Series Thermal Dispersion Flow Switch
The FineTek SP Series thermal dispersion flow switch keeps watch over liquid flow and trips a switch output the moment flow drops below a set point — a straightforward way to protect machinery and confirm process flow without any moving parts to maintain. It’s offered in several versions with a choice of insertion lengths, materials, and output types, including an explosion-proof variant for hazardous areas.
How It Works
The SP uses two temperature sensors to detect flow through heat transfer. One sensor floats at the fluid’s ambient temperature as a reference, while the other is heated with a constant amount of power. Flowing liquid carries heat away from the heated sensor, narrowing the temperature gap between the two — and once that gap falls below the adjustable setpoint, the switch confirms flow is present. When flow slows or stops, cooling drops off and the temperature gap widens again.
Key Features
- No moving parts — nothing to wear, stick, or foul
- User-adjustable flow setpoint
- Choice of insertion lengths, materials, and output types
- Explosion-proof version available for hazardous locations
- Dependable at both low-flow and no-flow conditions
Applications
- Confirming positive flow to control downstream processes
- Verifying coolant flow for safe machinery operation
- Pump protection and dry-run prevention
Industries Served
- HVAC and chiller plant
- Petrochemical
- Power generation
- General manufacturing
