Gurley Permeability Tester Vs Cyclic Compression Porometer: How Do the Two Differ

ByPmiApp

The PMI Advanced Gurley Permeability Tester has been designed to deliver an accurate and fast measurement of gas permeability of cylindrical, concrete, and sheet samples. This incredible machine features non-destructive and quick testing results, and it can also be used for quality control and R&D.

The PMI automatic Gurley Permeability Testing device measures air permeability according to ISO standards 5636-3 and 5, TAPPI-T460 with pneumatic clamping and digital display.

In contrast,

Cyclic Compression Porometer functions differently. This device applies cyclic measures on the pore structure characteristics and puts stress on a sample after an anticipated number of cycles. After any desired number of processes, the testing and stress cycles are automatically continued with the help of this device.

Operational Principles of PMI Testing Equipment

The Gurley Permeability Tester measures the time required for a given air volume (25cc to 300cc) to flow through a usual area of the material tested under low pressure. The air pressure is provided by an inner cylinder of standardized weight and explicit diameter floating spontaneously within an outer cylinder partially filled with oil to perform as an air-seal.

The sample material is detained between clamping plates having a circular orifice area of 1.0 (standard), 0.25, or 0.1 square inches.

Gurley Permeability analyses may be estimated directly or indirectly depending upon the test purpose and material. They are a direct test of materials planned to either permit or resist the passage of air. Indirectly, they are used to degree other physical properties that affect airflow through a porous sheet.

While in Cyclic Compression Porometer, the sample is loaded in the sample chamber and is exposed to stress cycles in the definite stress limits. At the end of the desired number of stress cycles, the pressure of a non-reacting gas on one side of the sample is amplified to initiate gas flow through pores.

The gas pressure and flow rates are measured and identified through the wet sample. The pores in the model are spontaneously filled by a wetting liquid. After data collection, the sample is re-wetted and again subjected to cyclic compression. The test is continued to obtain data as a function of the stress cycle number.

Let’s move forward to find out the differentiating factors of these devices.

Features of Gurley Permeability Tester

  • Completely automatic air permeability tester
  • Windows-based software handles complete manual control, data collection, measurement, and report generation
  • Comes with a computer equipped with a real-time graphical test display that depicts testing status and results throughout the operation.
  • Length of test around one minute
  • A wide array of acceptable sample sizes and types
  • Various sample chambers available
  • Minimal maintenance required
  • Non-destructive testing

Additional Features

  • The high flow rate of samples permeability measurement
  • under compressive stress-permeability
  • an inclusive range of gases and use of elevated test temperatures

Specifications of Gurley Permeability Tester

Air Permeance Range 
0.35µm/(Pa•s)
                                        
                                         
                                         
15µm/(Pa•s)
0.1 µm/(Pa•s)
100 µm/(Pa•s)
Sample Size                    
100mm x 100mm
Reservoir Volume         
10 liters
Range of Pressure          
up to (127 ± 0.02) kPa
Pressurizing Gas           
dry, clean, and compressed air any other
                                          
nonflammable and noncorrosive gas
Pressure Transducer Range    
 
0 – 150 kPa
Pneumatic Clamping      
(180±30)N
Pressure Controller       
1.47 ± 0.02 kPa
Accuracy                        
0.15% of reading
Mass Flow Transducer Range 
5-150 ± 2 ml/min
                                          
                                          
50-500 ± 5 ml/min
300-3000 ± 20 ml/min
Power Requirements  
220-230V, 50Hz

Features of Cyclic Compression Porometer

  • After the desired number of stress cycles
  • Automatically interrupts analysis
  • executes tests
  • obtains data
  • continues to cyclically stress the sample
  • very little operator participation
  • operator adjustable
  • stress limits in a cycle
  • number of cycles after which information is to be acquired
  • stress-free duration for data acquisition
  • total number of cycles

Specifications of Cyclic Compression Porometer

Pore Size Range
0.013 – 500 microns
Permeability Range
1 x 10-³ – 50 darcies
Sample Size 
1.75” – 2.5” diameter
Pressure Range
100 lbs
Pressurizing Gas
Clean, dry, and compressed air or nonflammable and noncorrosive gas
Weight 
0 – 500 psi
Resolution
1 in 60,000
Accuracy
0.15% of reading
Mass Flow Transducer Range
10³/min – 500,000 cm ³/min
Power Requirements
110/120 VAC, 50/60 Hz
Dimensions Measured 
30” H x 19” W x 18.5” D
Pressure Transducer Range
0 – 500 psi

All in All,

PMI permeability testers are relatively easy to use and are widely famous in different industries worldwide. The smart features and functions of these devices make them the perfect solution to measure volume, air, or pressure accurately. As stated above, the functions and features of the Gurley Permeability Tester and Cyclic Compression Porometer make them different from each other