Founded 1949. Proudly Made in USA by Americans!  We build them!


TSP* & PM10 Environmental Air Sampler Systems

Staplex® Critical Flow (Volumetric) High Volume Air Sampler System for Total Suspended Particulates and PM10

Models TSP-CF (110 V), TSP-CF-2 (220 V)


  • Constant Volumetric Flow Rate without anymoving parts or electronic components
  • Complies with U.S. EPA Reference
  • Method (40 CFR Part 50 Appendix B)
  • Durable design for outdoor use
  • Most complete system available
  • Made in U.S.A.


  • Special High Volume Air Sampler
  • Critical Flow Device
  • 8" x 10" Filter Folder with Filter Paper Cartridge
  • Aluminum Outdoor Shelter

Recommended accessories:

  • Mechanical or Digital Timer (specify preference when ordering)
  • Elapsed Time Indicator

Staplex® Model TSP-CF and TSP-CF-2 Critical Flow High Volume Air Sampler Systems are designed for Total Suspended Particulate (TSP) ambient air sampling for compliance with U.S. EPA Reference Method.

The Critical Flow Device is a dimensional venture used to control gas flow, When applied to a high volume air sampler, this flow control principle incorporates a smooth-wall venture orifice that gradually opens to a recovery section. Vacuum is provided by a motor downstream of the venture. Over 95% of the energy lost in differential pressures across the restricting orifice is recovered by this design,

Flow control is accomplished by occluding (restricting) and thus accelerating the air flow through the venture. At some point in the flow stream, the air velocity will equal the acoustic velocity or speed of sound in the throat (smallest diameter portion), and "critical flow " will be achieved. At the critical flow point, the critical flow device will not allow more air through under existing temperature and pressure conditions. As long as downstream changes are small, all conditions at the venturi (including the flow rate) are determined by upstream conditions. This condition is referred to as “choking" and is a distinctive characteristic of all volumetric critical flow devices.

The Staplex® Critical Flow High Volume Air Sampling Systems use this principle of choke to maintain a constant actual flow rate of 40 cubic feet per minute (1.13 cubic meters per minute) over a sample period. Since critical flow through the venturi is not greatly affected by changes in filter loading, ambient temperture or barometric pressure, a stable volumetric flow rate is maintained as long as power is provided to the sampler. The critical flow device regulates flow at a constant but unadjustable rate without any moving parts or electronic components.

Ordering Information: (specify components when ordering)

Staplex® Model TSP-CF Critical Flow High Volume Air Sampler System (110 Volts)

Staplex® Model TSP-CF-2 Critical Flow High Volume Air Sampler System (220 Volts)

[Shipping Weight: 75-lbs. (34 kg)]


Staplex® Type TFAGF810 Glass Fiber Filters, 8" x 10" (100/box)

Optional Accessories:

Flow Recorder - Models FR-1 and FR-2 - Provides a permanent record of High Volume Air Sampler performance during a 24-hour period. Specify Model FR-1 for 115 VAC; Model FR-2 for 230 VAC. (see additional data sheet).

Timers -

DTM-1 and DTM-2 Digital 7-Day Timer - Turns Air Sampler "ON" and "OFF" at set times, 24 hours a day, 7 days a week. All functions are digital and quartz crystal controlled; digital clock with 1/4-in. LED display and 7.2 VDC re-chargeable stand-by battery; intuitive programming format. Specify Model DTM-1 for 120 VAC, 60 Hz; Model DTM-2 for 230 VAC (specify 50 or 60 Hz when ordering). (Click to open pdf literature file)

MT-1 and MT-2 Mechanical 7 Day Timer Turns Air Sampler "ON" and "OFF" at set times ± 15 minutes, 24 hours a day, 7 days a week. Specify Model MLT-1 for 120 VAC, 60 Hz; Model MLT-2 for 230 VAC, 50 Hz

ETI-1 (120 VAC) /ETI-2 (220 VAC) Elapsed Time Indicator - (without Flow Controller) Shows sampler run time in hours and hundreths (99,999.99 hours, mechanical non-resettable). (Re-settable model ETI-1R is also available for 120 VAC.)

Calibration Kit - Models CKHV810 - U.S. EPA prescribed method for accurate calibration of High Volume Air Samplers. U.S. EPA recommends that High Volume Air Samplers be re-calibrated at least once per year (or when major components such as the motor or flowmeter are changed). Model CKHV810 can be used with 4" or 8" x 10" filter holder assemblies. (see additional data sheet)

PM10 Size Selective Inlets - for U.S. EPA PM10 environmental air sampling. Staplex® PM10 Size Selective Inlet is available separately as Part No. PM10-SSI for conversion of existing TSP (Total Suspend Particulate) High Volume Air Sampling Systems to PM10 System. (see additional data sheet)

4, 5 & 6 Stage High Volume Cascade Impactors - for particle size separation (see additional data sheet)

Made in U.S.A.