BS EN 15220-1:2009 pdf download – Railway applications — Brake indicators Part 1: Pneumatically operated brake indicators The brake indicator shall be able to function: 4.2.1 When the upper pressure limit of the compressed air used is 10 bar. It shall be able to withstand a hydraulic test with a pressure of 15 bar in accordance with 5.3.3. 4.2.2 Where the quality of the compressed air is at least class 4-4-4 according to ISO 8573-1. This requirement is verified when tests are carried out in accordance with 5.3.7.1. 4.2.3 In the temperature range for the environmental conditions to which the railway vehicle is submitted during its operation. The purchaser can specify a higher temperature value if operational constraints demand it. This requirement is tested in accordance with 5.3.7.1 and 5.3.7.2. 4.2.4 To withstand the external ingress of dust and water as specified in EN 60529 (code IP 55). These requirements are tested in accordance with 5.3.4. NOTE It can be necessary to use protection class IP 65 for indicators fitted with electrical components. 4.2.5 To withstand the external corrosion due to normal atmospheric pollutants as specified in EN 50125-1, the brake indicator shall be tested in accordance with the test shown in 5.3.12. 4.2.6 The brake indicator shall be able to function in the vibration environment, as described in EN 61373, of the railway vehicle on which it is mounted. 4.2.7 The brake indicator shall be able to withstand shocks and shall be tested in accordance with 5.3.10. 4.3 Functional characteristics 4.3.1 General The following requirements are defined to ensure that no malfunction of the brake indicator occurs: 4.3.2 Braking/release status The operating conditions of the braking/release flag and its change in status is defined and shall be tested in accordance with 5.3.8. 4.3.3 Lubrication It shall be possible to operate the brake indicator at all pressures without additional lubrication. 4.3.4 Leakage The sealing arrangement within the brake indicator shall prevent any unacceptable loss of air. The allowable loss of air shall be less than the leakage values when tested in accordance with 5.3.7.1 4.4 Constructional characteristics 4.4.1 External appearance The external surfaces of the brake indicator shall be free of sharp edges which could be a danger to those persons handling the brake indicator or to other equipment in the proximity of the brake indicator. This requirement shall be checked while testing the other constructional features in accordance with...

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