Fuel Chemical Stainless Steel Themal Dispersion Flow Switch
Production Description
Flow Switch Working Principle
A thermal dispersion flow switch is a device that detects the flow rate of liquids or gases by measuring the heat loss from a heated sensor. The switch activates or deactivates based on whether the flow meets a predefined threshold.
How a Thermal Dispersion Flow Switch Works
- When there is flow in the system, the medium (liquid or gas) carries heat away from the heated sensor, causing a temperature difference between the heated and reference sensors.
- The extent of this temperature difference correlates with the flow rate; more flow means more heat is carried away.
- The switch detects this difference and can activate or deactivate circuits depending on whether the flow meets a predefined threshold.
Types of Flow Switches:
- Mechanical Flow Switches: These have a mechanical switch or a microswitch that is directly activated by the movement of the piston.
- Magnetic Flow Switches: These switches use a magnet attached to the piston, which interacts with a magnetic reed switch located outside the flow chamber.
- Adjustable Piston Flow Switches: These switches allow the user to adjust the flow rate at which the piston activates the switch.
Product Specifications Configuration
Measure range | Water:3~300cm/s ; Air:200~300cm/s ; Oil:3~300cm/s |
Accuracy | ±1~±10cm/s |
Settling time | 3 minutes |
Pressure | 100Bar |
Media temperature | -20 to 80℃ |
Thread | G1/2 ,G1/4 ,G1,M18*1.5 |
Output signal | PNP / NPN / Relay /4-20mA |
Power | 24VDC , 110VAC , 220VAC |
Sensor length | 15mm , 20mm , 30mm , 40mm , 60mm |
Consumption current | <80mA |
Setting | Button |
Response time | 2(2-10)s |
Max.temperature gradient of medium | 300K/min |
Protect | Reverse / Short / Overload |
Protection grade | Ip67 |
Power connector | M12 with 1m cable |
Material | Sensor : ANSI316L Body :ANSI316L |
Load | Current : 250mA Relay : 30VDC/5A ,110VAC/5A, 220VAC/5A |
Product Installation Drawing
Thermal Flow Switch Wiring:
Applications:
1. Pump Protection
- Purpose: To prevent pumps from running dry or operating under low flow conditions, which can cause damage.
- Industry: Water treatment, chemical processing, HVAC.
- Example: Monitoring flow in a cooling system to ensure adequate water circulation, automatically shutting down the pump if the flow falls below a safe level.
2. HVAC Systems
- Purpose: To ensure proper air or liquid flow through heating, ventilation, and air conditioning systems.
- Industry: Building management, industrial heating systems.
- Example: Detecting airflow in ducts or monitoring cooling water flow to chillers to maintain system efficiency.
3. Water and Wastewater Treatment
- Purpose: To monitor fluid flow in pipelines and treatment processes, ensuring system stability and safety.
- Industry: Municipal water treatment, industrial wastewater plants.
- Example: Detecting the flow of treated water or wastewater to ensure pumps and valves are operating efficiently.
4. Chemical Processing
- Purpose: To monitor the flow of chemicals, gases, and liquids to avoid dangerous conditions like low flow or no flow in critical processes.
- Industry: Petrochemical, pharmaceutical, and manufacturing industries.
- Example: Monitoring flow in pipes carrying hazardous chemicals to ensure that valves close in case of a flow interruption.
5. Oil and Gas Industry
- Purpose: To detect and monitor the flow of gases and liquids, ensuring safe operation in potentially hazardous environments.
- Industry: Offshore and onshore oil rigs, refineries, gas distribution systems.
- Example: Monitoring the flow of gases in pipelines or flow rates in oil production processes to prevent equipment damage.
6. Cooling and Refrigeration Systems
- Purpose: To ensure constant fluid flow in cooling circuits and refrigeration systems to prevent overheating or freezing.
- Industry: Power plants, industrial refrigeration, and data centers.
- Example: Detecting coolant flow to protect sensitive equipment from damage due to excessive heat.
7. Food and Beverage Processing
- Purpose: To ensure proper flow of liquids and gases, such as in pasteurization or carbonation processes.
- Industry: Food and beverage production, dairy, brewing.
- Example: Monitoring the flow of liquids in a pasteurization system to ensure consistent heating and cooling.
8. Pharmaceutical Manufacturing
- Purpose: To ensure accurate flow rates in processes that require precise control of liquid or gas transfer.
- Industry: Pharmaceutical production, biotechnology.
- Example: Monitoring the flow of sterile liquids in a drug manufacturing process to ensure product quality.
9. Fire Suppression Systems
- Purpose: To monitor water or foam flow in fire suppression systems and detect any blockages or leaks.
- Industry: Industrial facilities, commercial buildings.
- Example: Detecting the flow of water in sprinkler systems and sending alerts if the flow drops below required levels.
10. Compressed Air Systems
- Purpose: To ensure the correct flow of compressed air for industrial applications, preventing system failures due to low airflow.
- Industry: Manufacturing, automotive.
- Example: Monitoring airflow in pneumatic tools or control systems to avoid production downtime.
11. Marine Applications
- Purpose: To monitor the flow of cooling water, fuel, or lubrication fluids in marine engines and systems.
- Industry: Shipping, offshore oil platforms.
- Example: Ensuring proper water flow in the engine cooling system of a ship to prevent overheating.
12. Gas Detection in Pipelines
- Purpose: To monitor the flow of gases in pipelines, especially in hazardous environments, to prevent leaks or blockages.
- Industry: Natural gas distribution, chemical manufacturing.
- Example: Detecting gas flow interruptions in pipelines to prevent potential accidents in industrial facilities.
These applications show the versatility of thermal dispersion flow switches, especially in environments where reliability, accuracy, and minimal maintenance are critical.
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