This is the most common and widely used type. Its core principle is based on heat being carried away by the gas flow. Two operating modes are typically used: “constant temperature difference” or “constant power”.
Based on sensor structure, this type can be further subdivided:
| Sensor Structure | Working Principle | Characteristics |
|---|---|---|
| Capillary / Bypass type | The main flow path is split; most gas goes through the main pipe; a small portion flows through a capillary tube, and the total flow is calculated proportionally. |
Advantage: Sensor does not contact gas directly – can measure corrosive gases. Disadvantage: Pressure loss exists; not suitable for low‑pressure gases. |
| In‑line / Invasive type | Heating and sensing elements are placed directly in the main flow path. |
Advantage: Can measure very small flows, very fast response. Disadvantage: Sensor directly contacts gas – affected by gas impurities and humidity. |
| MEMS type | Uses Micro‑Electro‑Mechanical Systems (MEMS) technology to fabricate a tiny sensor chip on a silicon wafer. |
Advantage: High integration, ultra‑low power, small size, bi‑directional flow measurement. Disadvantage: High technical barrier, relatively expensive. |
Contact: James
Phone: +86-15684187478
Tel: +86-15684187478
Email: james.shi@teleclear.cn
Add: Room 1116, Yeda Zhigu Building A, No. 300 Changjiang Road, Yantai ETDZ, Shandong, China
