What should be considered when using a micro air pump for particle counting applications?

Q: What should be considered when using a micro air pump for particle counting applications?

A: Particle detection differs from gas analysis as it involves measuring the mass and number of particles. The common method used is the laser scattering method. The gas to be tested is passed through a laser beam, and the scattering of the beam is observed for detection and counting. This application requires a pump that can control the flow rate and demands stable airflow with minimal pulsation.

Both micro diaphragm pumps and rotary vane pumps are commonly used as sampling pumps. Diaphragm pumps generally have slightly higher pulsation compared to rotary vane pumps. However, diaphragm pumps with multi-chamber structures or those equipped with flow stabilization devices can achieve flow stability comparable to rotary vane pumps.

Importantly, diaphragm pumps can utilize various corrosion-resistant rubber materials, offering far superior media compatibility and a significantly longer operational lifespan than rotary vane pumps, effectively reducing the total life cycle cost. Hilead Technology can integrate various flow stabilization components based on customer requirements to effectively eliminate gas pulsation while meeting the flow rate requirement of 2.83 L/min.

Additionally, it is recommended to place the sampling pump at the very end of the gas path, operating in suction mode. Installing a filter between the detection chamber outlet and the pump inlet prevents impurities from entering the pump and affecting the media entering the chamber, thereby extending the pump’s service life.