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    Volumetric Flow Controller (VFC) for PM2.5 Hi-Vol Air Samplers, 220V Brush Systems

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      Purchase Volumetric Flow Controller (VFC) for PM2.5 Hi-Vol Air Samplers, 220V Brush Systems

      Volumetric Flow Controller (VFC) for PM2.5 Hi-Vol Air Samplers, 220V Brush Systems SKU: TE-10557PM2.5X

      $1,296.00
       

      The TE-10557PM2.5X Volumetric Flow Controller (VFC) delivers precise flow control for PM2.5 high volume air samplers operating at 220 volts with brush-style motor systems. This VFC system uses a critical orifice with a predetermined orifice hole diameter to control the flow rate. The critical orifice is drilled and calibrated to let only the predetermined flow rate to pass through the filter. The motor on these systems operate wide open while the critical orifice maintains a constant flow rate.

      The volumetric flow control method provides reliable 16.67 liters/minute flow rate required for EPA-compliant PM2.5 ambient air monitoring under 40 CFR Part 50, Appendix L. The VFC controller is a critical orifice with a predetermined hole diameter. The critical orifice is calibrated in a NIST traceable lab to determine the volumetric flow rate. The motor runs wide open and as air passes through the critical orifice, the sampler runs at a predetermined flow rate.

      Key Specifications

      • Voltage: 220 volts, 50/60 Hz
      • Flow Rate: 16.67 L/min (EPA PM2.5 standard)
      • Motor Type: Brush-style systems
      • Includes: VFC orifice and look-up table
      • Calibration: NIST-traceable lab certified

      Compatibility

      This controller is designed specifically for 220-volt brush-style PM2.5 high volume air samplers. Compatible with Tisch Environmental PM2.5 samplers that utilize brush motor assemblies requiring periodic motor brush maintenance. For 110-volt systems, use the corresponding 110V VFC model instead.

      Flow Control Technology

      Volumetric flow controlled (VFC) PM2.5 particulate samplers use a critical orifice with a predetermined orifice hole diameter to control the flow rate. The motor on these systems operate wide open while the critical orifice maintains a constant flow rate. This approach ensures consistent sampling volume regardless of filter loading conditions, making it ideal for regulatory compliance, source assessment studies, and long-term environmental monitoring programs where filter loading varies significantly during sampling periods.

      The included look-up table provides flow rate corrections based on temperature and barometric pressure conditions at the sampling site. The particle size discrimination characteristics of both the inlet and the impactor are critically dependent on specific internal air velocities – a change in velocity will result in a change in the nominal particle size collected. The sampler's actual volumetric flow rate determines the aerodynamic particle size cutpoint, making it critically important to ensure the accurate collection and measurement of PM2.5 concentrations.

      Applications

      Essential for PM2.5 ambient air quality monitoring programs complying with National Ambient Air Quality Standards (NAAQS). Suitable for state and local air quality monitoring networks, environmental compliance monitoring, and research applications requiring precise PM2.5 particulate collection at the EPA-specified flow rate.