Porous Materials, Inc > Products > Permeameters > Gas Permeation Analyzer
Gas Adsorption & Permeation Analyzer
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Description
The unique analyzer can determine the absoption and transport of various gases through a sheet-like material under a wide range of dynamic conditions, which in turn, can be used to simulate real-world applications. The instrument is equipped with sensitive sensors to detect small concentrations. The instrument is ideal for small and even delicate sheet-like materials such as fabrics or films.
Operation
The flow rates of two streams of nitrogen gas are independently controlled using two flow controllers. One of the gas streams is saturated by passing through bubblers containing carbon tetrachloride. The two streams mix, and a sample of the gas mixture is analyzed. The mixed gas passes through the sample from the top chamber to the bottom chamber. The gas exiting from the bottom chamber is analyzed. The gas then passes through a flow meter.
Flow can be controlled within 1-5 L/min. By controlling the amount of saturated gas that mixes with the N2 stream through a feedback loop, it is possible to control the CCL4 contained in the gas stream between 0.1-10 mg/L. Two 3-way valves provided in the gas line permit the operator to bypass the sample chamber in order to acheive the correct concentration of CCL4 in the N2 stream.
Principles
The basic principle is that when a gas stream containing a particular vapor species flows through the sample, the vapor is absorbed by the sample. Any unabsorbed vapor escapes through the outgoing gas. A sensor measures the concentration of the gas species at the inlet and outlet sides of the sample chamber. Using the measured concentration difference between the inlet and outlet, the mass absorption quantity can be calculated.
(i) Cumulative absorption at breakthrough time, t0:
Where:
- F = Flow Rate
- A = area
- Ci = inlet concentration
- Co = outlet concentration
- t = time
(ii) At time 't0' output concentration CO > 0, and an alarm sounds.
For more information about applications please see our technical papers.
Features
- Can detect change of concentration in the gas as a function of time
- Versatile & user friendly software for:
- Fully Automated Tests
- Manual control of all system components
- Data collection, storage, analysis, & reporting
- Customized testing parameters
- Applicable for a wide variety of sheet-like materials
- High measurement speed, stability, & resolution
- Flow ability to create a wide range of testing conditions, including gas flow
- Interchangeability of system components
- Durable stainless steel construction
Specifications
- Gas Concentration Measurement:
- Detectable Concentration Range: 100 - 1000 ppm
- Concentration Resolution: 1ppm
- Volumetric Flow Rate Measurement:
- Maximum Total Flow Rate: 5 L/min (+/- 1% accuracy)
- Test Concentration: 0.1 - 10 mg/L
- Sample Area: 83 cm2
For more information see our Gas Adsorption and Permeation Analyzer brochure , the General Permeameters brochure, and Characterization of Pore Structure Brochure.
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