bsen12875-1-20xxmechanicaldishwashingresistanceofutensils-part1referencetestmethodfordomestic

bsen12875-1-20xxmechanicaldishwashingresistanceofutensils-part1referencetestmethodfordomestic内容摘要：

of household and similar electrical appliances Part 25: Particular requirements for dishwashers (IEC 6033525: 1992, modified) IEC 60436, Electric dishwashers for household use Methods for measuring the performance ISO 6059, Water quality – Determination of the sum of calcium and magnesium – EDTA titrimetric method ISO 8288, Water quality – Determination of cobalt, nickel, copper, zinc, cadmium and lead – Flame atomic absorption spectrometric methods ISO 9297, Water quality – Determination of chloride – Silver nitrate titration with chromate indicator (Mohr39。 s method) 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. dishwashing resistance ability of the article to withstand a number of test cycles without significant changes test dishwasher special domestic dishwashing machine, which washes, rinses and dries articles, and which simulates the mean stresses of a domestic dishwashing machine test cycle series of operations for the washing, rinsing and drying of the articles basket rack or partitioned container for placing articles in a test dishwasher cleaning agent mixture of chemicals for use in a dishwasher for improvement of its soil removal capability EN 128751:2020 (E) 6 cleaning agent dispenser, automatic device which dispenses a defined portion of cleaning agent at the appropriate time during the test cycle rinse agent mixture containing reagents which lower the surface tension, normally added to improve the drying effect and reduce the precipitation of salts rinse agent dispenser device from which a defined volume of rinse agent is automatically dispensed at the appropriate time during the test cycle water softener device which reduces the hardness of water by a cation exchange system normal corrected vision naked eye corrected to normal vision if necessary NOTE This is usually by the wearing of spectacles. 4 Principle Unused articles are repeatedly exposed to a standardized test cycle in a test dishwasher which simulates usual household dishwashing machines. The test dishwasher is a machine in which a washing cycle consists of several partial steps: prewash, a cleaning step using alkaline cleaner, an intermediate rinse step, and the final rinse during which a rinse aid is added. The washing cycle is followed by a drying step. The test dishwasher is fully loaded. After testing the articles are inspected for deviations from the original according to the conditions specified in the relevant standards for various groups of products. 5 Reagents Water The used water shall be drinking water and shall have a temperature of (15 177。 5) 176。 C. It shall be softened by the cation exchanger as specified in . NOTE 1 Attention is drawn to EU directive 80/778/EEC and any national legislation relating to drinking water. For testing metal articles, the chloride ion content shall not exceed 150 mg l1 when determined in accordance with ISO 9297. For testing plastics articles, the copper content shall not exceed 0,03 mg l1 when determined in accordance with ISO 8288. NOTE 2 A higher copper content results in a noticeable yellowing of plastics. Cleaning and rinse agents For the purpose of this test, cleaning detergent A containing phosphate, and the acidic rinse agent formula II, EN 128751:2020 (E) 7 as given in IEC 60436, shall be used. EN 128751:2020 (E) 8 6 Features of the test dishwasher Water softener (cation exchanger), which shall be controlled to give a water hardness c(Ca2+ + Mg2+) of between 0,3 mmol/l1) and 0,6 mmol/l2) , when tested in accordance with ISO 6059. Heat supply sufficient to provide the heating rate specified in ). Constant water quantity for each washing cycle of (6,0 177。 0,5) l, with a water pressure of between 5 N/cm2 and 100 N/cm2. Automatic proportioning devices to deliver the required amount of cleaning and rinse agents in each test cycle. Automatic fully opening door or means of reducing temperature and humidity at an equivalent rate following pletion of the washing cycle. Thermostat with an accuracy of 177。 1 176。 C. Automation to the effect that the plete washing cycle specified in is performed and repeated automatically. Counter which records the number of washing cycles. For safety the dishwasher shall ply with EN 603351 and EN 6033525. 7 Test specimens For each article a sufficient number of unused specimens of identical shape, size and surface finish shall be tested and further specimens shall be retained for reference. NOTE It is remended that at least three test specimens are tested in order to obtain representative results. The specimens shall be free of surface contamination, . by wash。