VFC TSP Hi-Vol Air Sampler, 110V Brush Style Systems w/ Critical Orifice & Look-Up Table

Thumbnail Filmstrip of VFC TSP Hi-Vol Air Sampler, 110V Brush Style Systems w/ Critical Orifice & Look-Up Table Images

The TE-10557TSP Volumetric Flow Controller (VFC) is a precision-calibrated critical orifice assembly designed for Total Suspended Particulate (TSP) high volume air samplers using brush style motors operating at 110 volts. This flow control system uses a critical orifice with a predetermined orifice hole diameter to control the flow rate, with the critical orifice drilled and calibrated to let only the predetermined flow rate pass through the filter.

Operating Principle

The VFC controller operates as a critical orifice with a predetermined hole diameter, calibrated in a NIST traceable laboratory to determine the volumetric flow rate. The motor on these systems operates wide open while the critical orifice maintains a constant flow rate. This design ensures consistent sampling performance throughout the collection period by maintaining flow control through the restrictive orifice rather than varying motor speed.

Key Specifications

Voltage: 110V AC
Motor compatibility: Brush style systems only
Includes: VFC orifice and calibration look-up table
NIST traceable calibration
Flow rate range: 39-60 ft³/min (1.1-1.7 m³/min) actual conditions

EPA Compliance & Applications

This VFC system supports EPA-compliant TSP monitoring for determining compliance with primary and secondary National Ambient Air Quality Standards (NAAQS) for particulate matter as specified in 40 CFR Part 50. TSP samplers draw measured quantities of ambient air through filters during 24-hour nominal sampling periods, making this controller essential for 40 CFR Part 50, Appendix B reference method compliance.

System Compatibility

The TE-10557TSP is specifically engineered for 110V brush style TSP high volume air sampler systems. This controller is not compatible with brushless motor systems, PM10, or PM2.5 configurations. For 220V brush style TSP systems, use TE-10557TSPX. The VFC assembly integrates with standard TSP filter holders, pressure recorders, and timing systems to complete the sampling train.

Installation & Calibration

Each VFC orifice ships with a NIST traceable calibration certificate and look-up table containing the specific flow rate characteristics for that individual orifice. The look-up table provides the relationship between differential pressure across the orifice and the actual volumetric flow rate, enabling accurate flow calculations under varying atmospheric conditions. Installation requires integration into the sampler's flow path between the filter holder and blower motor assembly.