AS ISO 8925-2021 pdf free download – Earth-moving machinery — Diagnostic ports.
This International Standard defines the sizes, types and accessibility of diagnostic ports for usein measuring fluid temperature, pressure and flow, and to obtain fluid samples. It also sets out therequirements for accessibility to the port.
lt applies to earth-moving machinery as defined in ISO 6165, and gives general guidelines fordiagnostic port use.
2Normative references
The following standards contain provisions which, through reference in this text, constitute provisionsof this International Standard.At the time of publication,the editions indicated were valid.All standardsare subject to revision, and parties to agreements based on this International Standard are encouragedto investigate the possibility of applying the most recent editions of the standards indicated below.Members of lEC and lS0 maintain registers of currently valid International Standards.
ISO 2860:1983,Earth-moving machinery — Minimum access dimensions.
ISO 4510-1:1987，Earth-moving machinery —Service tools – Part 1 : Common maintenance andadjustment tools.
ISO 6149:1980, Fluid power systems and components —Metric ports — Dimensions and design.ISO 6165:1987,Earth-moving machinery — Basic types —Vocabulary.
3Size and type of port
3.1Temperature, pressure and sampling ports
The port size for measuring temperature and pressure, and to obtain fluid samples shall be anM14× 1,51) port, in accordance with ISO 6149, attached to a tube of 8 mm outside diameter.
3.2Flow measurement ports
Flow measurement ports shall be adequate for the flow to be measured.Generally, sizes below 25 mmtube should be as specified in 3.1 and sizes equal to and above 25 mm should have either threaded orflanged port faces.
4 Application guidelines
4.1 Number and location of diagnostic ports
The number and location of diagnostic port checking points shall be determined by the manufacturerand shall be commensurate with the complexity of the system being checked and cost effectiveness.The preferred location of diagnostic ports is in the component; however, they should be readily andsafely accessible which might often require them to be located in a connecting line.The ports should beso located in the fluid stream as to minimize any conditions which could cause inaccuracies in readings: for fluid sampling, the ports should be located in a turbulent flow section of the system.
The ports shall be fitted with devices to prevent loss of fluid during connecting and disconnecting of diagnostic measuring instruments. The ports shall also be located so that the fluid is not contaminated from the surface of the machine when connecting the measuring instruments or during fluid sampling.
4.2  Accessibility
4.2.1 Test ports shall be accessible with common tools, limited to those specified in ISO 4510-1, without the removal of any component other than sealing caps, access panels and/or plates.
4.2.2 A free access area of 75 mm radius around the centreline of the port and 200 mm from the port surface shall be provided. Access to the port shall be as specified in ISO 2860.AS ISO 8925 pdf download.