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TSP High Volume Air Samplers

Product SKU: 20

Quick Overview

High Volume Air Samplers

Availability: In stock

$2,500.00

Details

 

The high volume air sampler is U.S. EPAs Federal Reference Method for sampling total suspended particulates (TSP) in ambient air.

Meets U.S. EPA 40 CFR Part 50, Appendix B - Reference Method for the Determination of Suspended Particulate Matter in the Atmosphere (High-Volume Method)

All TSP hi-vols feature accurate collection of total suspended particulates according to U.S. EPA specifications. Hi-vols have been used extensively in Federal, state and industrial monitoring networks for the measurement of ambient air quality standards for TSP and are used widely for occupational health monitoring and particulate research studies. 

PRINCIPLE OF OPERATION
The high volume air sampler collects suspended particulates on large 8 x 10-inch (20.3 x 25.4cm) filter media. The name high volume is appropriate because the sampling flow rate has a high level of 20 to 60 standard cubic feet per minute (SCFM), or 0.57 to 1.71 standard cubic meters per minute (SCMM). Because of the high flow rate, large quantities of particles ranging from 0.1 to 1 gram are collected over a typical 24-hour sampling period. This facilitates gravimetric and chemical analysis and is the advantage hi vol samplers have over other air sampling methods. 

FLOW CONTROL SYSTEMS
Two types of flow control systems are available. One is mass flow control (MFC), while the other is volumetric flow control (VFC).

  • The flow rate in a MFC system is actively sensed and controlled at some pre-determined set point. Air is pulled through the filter into the intake of a blower and subsequently exits the sampler through an exit orifice, which facilitates measurement of the flow with a manometer or pressure recorder. The flow rate is controlled by an electronic mass-flow controller, which uses a flow sensor installed below the filter holder to monitor the mass flow rate and to control the speed of the motor accordingly. The controlled flow rate can be changed by an adjustment knob on the flow controller.
 
  • A VFC system maintains a constant volumetric flow rate (given a fixed temperature) through the inlet, rather than a constant mass flow rate as in the MFC system. A choked-flow venturi is operated such that the air attains sonic velocity in the throat of the device. In this "choked" mode, the flow rate is unaffected by downstream conditions such as motor speed or exit pressure, and is a predictable function of upstream conditions, such as stagnation pressure ratio and temperature. Thus, the volumetric flow is controlled without any moving parts or electronic components. With this type of flow control system, no means is provided for adjusting the controlled flow rate.

 

Specifications: 

Flow Rate 39 to 60 cfm (1.1 to 1.7 cmm) for MFC;typically 42 to 45 cfm (1.2 to 1.3 cmm) for VFC
Mass Flow Control Accuracy ±2.5% deviation over 24-hr period
Volumetric Flow Control Accuracy ±1% deviation over 24-hr period
Flow Indicator(when supplied) Flow/pressure recorder with circular charts, 4" (10 cm) dia.; range 10 to 65 cfm (0 to 10" water

 

Product Specs

Purity of Hydrogen    99.999%  
Flow Amount    300 ml/minute  
Output Pressure of Hydrogen Gas   0 to 0.4 MPa  
Precision of Pressure Stabilization   0.05 MPa  
Over-Pressure Protection   0.45 MPa  
Power Requirements   110/220 ± 10V, 100W  
Dimensions   16 x 18 x 9-inches (400 x 450 x 220 mm)  
Color   Blue  

Additional Information

Technical Specifications

Specifications: 

Flow Rate 39 to 60 cfm (1.1 to 1.7 cmm) for MFC;typically 42 to 45 cfm (1.2 to 1.3 cmm) for VFC
Mass Flow Control Accuracy ±2.5% deviation over 24-hr period
Volumetric Flow Control Accuracy ±1% deviation over 24-hr period
Flow Indicator(when supplied) Flow/pressure recorder with circular charts, 4" (10 cm) dia.; range 10 to 65 cfm (0 to 10" water

 

Product Specs

Purity of Hydrogen    99.999%  
Flow Amount    300 ml/minute  
Output Pressure of Hydrogen Gas   0 to 0.4 MPa  
Precision of Pressure Stabilization   0.05 MPa  
Over-Pressure Protection   0.45 MPa  
Power Requirements   110/220 ± 10V, 100W  
Dimensions   16 x 18 x 9-inches (400 x 450 x 220 mm)  
Color   Blue