VFC PM10 Hi-Vol Air Sampler, 110V Brush Style Systems SKU: TE-10557PM10

The TE-10557PM10 Volumetric Flow Controller (VFC) delivers precise flow control for PM10 high volume air samplers designed according to 40 CFR appendix J to part 50 and designated as a federal reference method sampler. This complete VFC assembly includes the critical orifice and flow look-up table, providing reliable volumetric flow control for brush-style motor systems operating at 110 volts.

How Volumetric Flow Control Works

Volumetric flow controlled (VFC) PM10 particulate samplers use 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 pass through the filter. The volumetric flow controller (VFC) uses a vacuum motor that operates at maximum speed. The vacuum motor draws air through a fixed area in the VFC, and a critical flow is established through the PM10 sampling head at 40 CFM. The critical orifice provides essentially constant volumetric flow rate independent of ambient pressure changes and only varies slightly with the square root of ambient temperature.

Key Specifications

• Voltage: 110V systems only
• Compatible with: Brush-style motor assemblies
• Flow rate: 36-60 ft³/min during 24 hour sampling period
• Calibration: Critical orifice calibrated in a NIST traceable lab to determine the volumetric flow rate

System Compatibility

The TE-10557PM10 is specifically designed for brush-style PM10 high volume air samplers. The high-volume sampler employs two basic types of flow control systems. One is a mass-flow-control (MFC) system; the other is a volumetric-flow-control (VFC) system. Because the calibration and standard operating procedures differ considerably between these two types of flow-control systems, ensure you select the correct VFC version for your system configuration. This controller is compatible with:

• TE-6000 series PM10 high volume air samplers
• 110V brush-style blower motor assemblies
• 8" x 10" filter holders with stagnation pressure taps
• Both mechanical and digital timer systems

Calibration and Maintenance

The PM10 VFC Sampler is calibrated using an orifice transfer standard that has been standardized against a primary standard. The included flow look-up table provides the calibration data necessary for accurate flow calculations. Each PM10 VFC Sampler when properly configured is a United States Environmental Protection Agency (U.S. EPA) Designated Reference Method.

EPA Compliance

This VFC system ensures compliance with 40 CFR Part 50, Appendix J for PM10 reference method sampling. A volumetric flow control system maintains a constant volumetric flow rate (given a fixed temperature) through the PM10 inlet. A choked-flow venturi is operated such that the air attains sonic velocity in the throat of the device, ensuring accurate particle size fractionation and reliable ambient air monitoring data.