Flow Sensors

1. What are Flow Sensors?

Flow sensors measure flow rate, pressure, or temperature changes in fluids (gas/liquid). Key types include:

Thermal: Utilizes heat conduction (e.g., constant temperature differential method);

Electromagnetic: Based on Faraday’s law of electromagnetic induction;

Ultrasonic: Calculates flow rate by using the difference in sound wave transit time.

Measurement Range: 0.1 mL/min to 100 m³/h;

Accuracy: ±0.5% FS (high-end models can reach ±0.1%);

Response Time: <50 ms (high-speed industrial grade).

Field	Typical Applications	Technical Requirements
Smart Manufacturing	Semiconductor Etching Gas Flow Control	Corrosion Resistance/Nanoscale Precision
Medical Equipment	Ventilator Oxygen Flow Monitoring	Biocompatibility/Low Power Consumption
New Energy	Hydrogen Fuel Station Metering	High-Pressure Compatibility/Explosion-Proof Design

MEMS Integration: Chip-scale flow sensors enable miniaturization (e.g., Boson’s BME688).

AI Algorithm Fusion: Compensating for environmental interference errors through machine learning.

Wireless Sensor Network: LoRa Technology enables distributed flow monitoring.

Corrosive Media: Hastelloy probes are preferred.

High-Pressure Environments: Burst pressure must be verified to be ≥ 1.5 times the operating pressure.

Calibration Cycle: Traceable calibration is recommended every 6 months.