A cooling water flow switch is a safety control device used to monitor the flow status of cooling water. It will issue an alarm signal to protect the equipment when the water flow stops or falls below the set value.
The main working principles include:
Mechanical (baffle type): When water flows in the pipe, the water flow pushes a metal plate or baffle to deflect, activating the circuit and sending a water flow signal.
Thermal type: Utilizes the principle of temperature change of the probe, detecting flow rate by measuring the temperature difference between a heating sensor and a thermal sensor.
Differential pressure type: Measures the pressure drop across valves, orifices, etc., and obtains accurate flow rate based on the pressure drop and flow rate curve.
Main functions:
The core functions of the cooling water flow switch include:
Real-time monitoring: Monitors the flow status of cooling water to ensure unit operation. Temperature within a reasonable range
Alarm Protection: Issues an alarm signal when water flow stops or becomes abnormal, notifying the central control room to take action.
Equipment Interlocking: Interlocks with pumps, valves, and other equipment for control, preventing equipment from running dry or overloaded.
Typical Applications
Widely used in:
Industrial Equipment: Water-cooled welding machines, laser equipment cooling systems, vacuum coating machines, electric furnaces, polycrystalline silicon ingot furnaces, etc.
HVAC Systems: Water flow control for air-cooled or water-cooled chillers.
Building Automation: Monitoring of cooling water and chilled water circuits in air conditioning systems.
Technical Parameters
Common Technical Indicators:
Start-up flow rate: Typically triggers at flow rates above 1.0 liters per minute.
Response time: Typically 2 seconds.
Temperature range: -25℃ to 80℃.
Pressure rating: 10MPa6.
Installation points:
Installation precautions:
Should be installed on a straight pipe with at least 5 times the pipe diameter on both sides.
Keep the arrow on the flow switch housing aligned with the direction of fluid flow in the pipe.
Avoid installation at pipe bends or locations with significant water flow disturbance.
Cannot be subjected to water hammer; a flow throttle should be installed for protection.
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