The AWM43300VH is a high-performance gas mass flow sensor launched by Honeywell. Based on advanced MEMS microbridge sensing technology and the thermal measurement principle, it achieves accurate gas flow detection by monitoring heat transfer. The sensor integrates a complete signal conditioning circuit internally, including a differential amplifier, heater control circuit, and sensor bridge supply circuit, enabling direct output of a standard analog voltage signal from 1V to 5V, greatly simplifying the user's external circuit design.

1. Measuring Range: 0 to ±1000 SCCM (Standard Cubic Centimeters per Minute). This range is suitable for precise measurement of small to medium gas flows.

2. Output Signal: Analog voltage output, ranging from 1V to 5V, directly proportional to the flow rate.

3. Power Requirement: Requires a DC supply voltage of 8V to 15V.

4. Operating Temperature: Can operate stably within an ambient temperature range of -25°C to +85°C.

5. Physical Interface: Equipped with a 0.246-inch (approximately 6.25 mm) male dual-port for gas path connection.

6. Accuracy: High precision, up to ±0.5%.

7. Package: Utilizes a ceramic flow tube, capable of withstanding high common-mode pressure, robust and durable.

【Technical Features】

1. Integrated Amplification Circuit:

The AWM43300VH is an amplified device, which is one of its key advantages. Unlike non-amplified models requiring external circuitry, it integrates a complete signal conditioning system internally:

• Differential instrumentation amplifier circuit
  
• lHeater control circuit
  
• Sensor bridge supply circuit
  

This means the sensor can directly output an amplified, easy-to-acquire analog voltage signal (e.g., 1-5V), greatly simplifying the user's external circuit design.

2. Microbridge Sensing Technology: Its core is based on a 'microbridge' structure fabricated on a silicon chip. This technology measures flow via a thermal principle, offering fast response and high sensitivity.

Additionally, to ensure long-term stable operation in various environments, the sensor incorporates several special designs:

a. Resistance to Particulate Contamination: Its microstructure design allows dust particles in the airflow to pass parallel to the chip surface. Simultaneously, the thermophoretic effect generated by the chip repels micron-sized particles away from the bridge structure. The manufacturer recommends using an upstream 5-micron disposable filter for adequate protection.

b. Robust Package: The ceramic flow tube can withstand high line pressures (common-mode pressure).

c. IMPORTANT WARNING: This sensor is for gas measurement only and must never be used for liquid measurement, as this will damage the sensor.

In summary, the technical features of the AWM43300VH can be described as: employing a thermally isolated microbridge structure to achieve highly sensitive directional mass flow detection, providing a stable and easy-to-use voltage output through fully integrated amplification and temperature compensation circuits, while also possessing good resistance to particulate contamination.

Application Areas

Due to its high accuracy and reliability, it is commonly used in medical equipment (such as ventilators, anesthesia machines), industrial process control, laboratory analytical instruments, and for gas flow monitoring in HVAC systems.