VFC PM2.5 Hi-Vol Air Sampler Controller, 220V Brushless SKU: TE-10557PM2.5BLX

The TE-10557PM2.5BLX volumetric flow controller (VFC) provides precise flow rate control for PM2.5 high volume air samplers operating at 220 volts with brushless motor systems. This critical orifice-based controller uses a predetermined orifice hole diameter to maintain constant volumetric flow, allowing the motor to operate wide open while the critical orifice maintains steady flow rate through the PM2.5 filter.

Technical Operation

VFC systems maintain constant volumetric flow rate through the use of a choked-flow venturi operated at sonic velocity in the throat, making flow rate unaffected by downstream conditions such as motor speed or exit pressure. This design controls volumetric flow without any moving parts or electronic components. The critical orifice is calibrated in a NIST traceable laboratory to determine the precise volumetric flow rate.

Key Specifications

• Voltage: 220V AC
• Motor compatibility: Brushless style systems
• Application: PM2.5 particulate sampling
• Flow control method: Critical orifice (VFC)
• Includes: VFC orifice and calibration look-up table

System Compatibility

This VFC controller is specifically designed for PM2.5 high volume air samplers operating with brushless motor assemblies. Brushless motors do not use motor brushes, require no routine maintenance, and produce no emissions, though they are higher in cost than brush-style alternatives. The controller maintains the precise flow rate control required for EPA-compliant PM2.5 sampling applications.

PM2.5 Sampling Applications

This controller supports PM2.5 particulate sampling where quartz filters are weighed before and after sampling to determine the mass of particulates smaller than 2.5 microns. The system enables compliance with 40 CFR Part 50, Appendix L PM2.5 reference method requirements for ambient air quality monitoring networks and research applications.