Low Air Flow Sensor for Oxygen/Nitrogen, 0~200 sccm

High-precision micro gas flow sensors for sale. Utilizing the thermal transfer principle to measure gas flow, capable of measuring Oxygen/Nitrogen within a 0~200 sccm range. The air flow sensor incorporates a thermal flow chip and a high-performance CMOS microprocessor with integrated 24-bit AD conversion. Equipped with I2C digital communication, operating at 5V, and featuring a compact size, it is suitable for various scenarios requiring gas flow measurement.

Feature

• The SUCH micro-flow sensor undergoes rigorous factory calibration, enabling flow detection via simple read commands to reduce user operating costs and minimize secondary development complexity.
• The low-flow air sensor features bidirectional measurement capability, operates at 5V, functions within -10°C to 50°C, and employs I2C digital communication for high precision and repeatability.
• Applications include gas flow monitoring in medical therapy devices, smoke gas ratio monitoring for special effects technology, fragrance gas ratio monitoring, industrial gas flow monitoring, and precision dispensing volume monitoring for industrial filling processes.

Dimension (unit: mm)

Detail

Typical Circuit

Note: If the SCL and SDA signal lines are parallel and very close to each other, it may cause signal crosstalk and communication failure. The solution is to place the VDD signal or GND between the two signal lines to separate them.

Additionally, reducing the SCL frequency can enhance signal transmission integrity. In complex communication environments, a 100nF decoupling capacitor should be placed as close as possible to the flow sensor between the positive and negative power supply pins for filtering.

Connection

To ensure more stable measurement conditions, careful attention must be paid to the installation location of the air flow sensor. Avoid excessive bends (greater than 45°) in the inlet and outlet air pipes, as this may compromise sensor accuracy. The diagram above illustrates the product's pipeline installation. The inlet and outlet air pipes should be fixed in a straight line, with lengths L1 and L2 maintained at over 10cm. The flow sensor supports bidirectional gas input. C1 is the forward gas input port, where readings are positive; C2 is the reverse gas input port, where readings are negative.