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ISO 22197-3-2011 pdf free download

ISO 22197-3-2011 pdf free download.Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for air-purification performance of semiconducting photocatalytic materials Part 3:Removal of toluene
Ceramiques techniques — Méth odes d’essai relatives a Ia performance des matérlaux photocatalytiques semi-conducteurs pour Ia purification de Pair— Partie 3: Elimination du toluène.
8.3.1 Adjust the test gas supply beforehand so that it can stably supply the test gas containing
5,0 pIll ± 0,25 pIll of toluene and 1,56 % ± 0,16 % of volume fraction of water vapour at 25.0 °C ± 2.5 °C. This water-vapour volume fraction is equivalent to a relative humidity of 50 % at 25 °C. The measurement of humidity shall be made using the procedure in ISO 4677-1. Adjust the flow regulator in order for the flow rate at the inlet of the reactor to be 0.5 1/mm (0 °C. 101.3 kPa. and dry-gas basis). Measure and record the irradiance from the light source at the surface of the test piece, For the light source that requires warming up. turn the power on well before the measurement of irradiance and irradiation for the toluene removal test. Use the shutter appropriately to avoid unnecessary irradiation to the photoreactor.
8.3.2 Place the test piece in the centre of the photoreactor and attach the glass window after adjusting the air layer between the test piece and window to be 5,0 mm ± 0,5 mm thick. If necessary, height-adjusting plates are used for this purpose, adjusting the height before and after the test piece to be within 1,0 mm difference based on the top of the test piece. Check that the reactor is sealed by visual examination of the sealing material, such as an 0-ring to tightly contact the glass window.
8.3.3 Allow the test gas to flow into the photoreactor, without photoirradiation. The flow rate shall be
0,5 I/mm. Record the change in the concentrations of toluene under dark conditions for 30 mm. Adsorption of toluene onto the test piece can be observed by this procedure. When the concentration at the outlet of the reactor returns to the supply gas concentration within 30 mm. photoirradiation may be started at the time. If the toluene concentration is less than 90 % of the concentration supplied, continue until it exceeds this. If the concentration does not exceed 90 % after 90 mm, stop measurement and report that this test is not applicable to the test piece used.
8.3.4 Maintain the gas to flow and commence irradiation of the test piece, and record the concentration of toluene under photoirradiation for 3 h. The concentration decreases, as shown in Figure 4, if toluene is decomposed by a photocatalyst and then stabilizes. The concentration of toluene at the outlet of the photoreactor should be the average of 3 or more measurements in the last 1 h testing period. If the relative standard deviation of the last 3 measurements exceeds 20 %, report this instability with possible reasons, such as deactivation of the test piece.
8.3.5 Stop photoirradiation and confirm that the concentration of toluene returns to supply gas concentration. Stop the gas supply to the reactor and take the test piece out of the reactor.
9 Calculation
The test results shall be calculated as follows. The calculated values are usually rounded to one decimal place in accordance with ISO 80000-1. The observed concentration of toluene before water-vapour correction shall be used for calculation. The flow rate of the test gasjis 0.5 (1/mm). normalized for 0 °C, 101.3 kPa and dry- gas basis, and is then multiplied by a factor of 1,016 for water-vapour correction.
The removal percentage of toluene (R) is calculated by Equation (1). When R is either below 5 % or more than
95 %, it is expressed as below 5 % or ‘more than 95 %, respectively. Then the quantity of toluene removed
(n) is calculated by Equation (2).ISO 22197-3-2011 pdf free download.

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