THERMAL FLOW METER

Product Description

A thermal flow meter is a type of flow measurement device that operates based on the principles of heat transfer. It measures the flow rate of a fluid (typically gases or liquids) by detecting the heat carried by the fluid as it passes through the sensor. The meter uses a heated element and temperature sensors to determine the flow rate. As the fluid flows, it carries away heat from the element, and the change in temperature is used to calculate the flow velocity.

Basic Principles:

1. Heated Sensor: The thermal flow meter contains a heating element (such as a resistor) placed in the flow stream. This element is typically heated to a constant temperature.

2. Temperature Differential: As the fluid flows over the heated element, it cools the element based on the fluids flow rate. The faster the flow, the more heat is carried away, which results in a greater temperature drop.

3. Temperature Sensors: Two temperature sensors are often used to detect the temperature of the fluid before and after it passes over the heated element. The difference in these temperatures allows the flow rate to be calculated.

4. Flow Rate Calculation: The temperature difference is used to determine the mass flow rate or volumetric flow rate, depending on the design.

Types of Thermal Flow Meters:

1. Insertion Type: The sensor is inserted into the flow pipe to measure the flow rate. These are generally used in larger pipes or ducts.

2. Inline Type: The flow meter is installed directly in the flow path of the pipe, providing more direct and continuous flow measurements.

3. Clamp-on Type: This type measures the temperature difference across the outside of a pipe, typically using ultrasonic technology in conjunction with thermal sensors.

Advantages:

• No Moving Parts: Unlike mechanical flow meters, thermal flow meters have no moving parts, which reduces wear and tear, leading to a longer lifespan.

• Accuracy: They offer accurate measurements for low to moderate flow rates.

• Versatility: Suitable for a wide range of gases and liquids, especially for low flow or mass flow applications.

• Compact Design: Can be compact and easy to install in various settings.

Applications:

• Industrial Processes: Used in HVAC systems, chemical processes, and gas flow measurement.

• Environmental Monitoring: For measuring emissions and gas flow rates.

• Energy Management: Used in monitoring and optimizing heating systems and boilers.