This European Standard specifies safety requirements, safety factors, test methods, test pressures and marking of liquid level indicating devices, referred to throughout this standard as "level indicators", for use in refrigerating systems and heat pumps. It applies to devices connected to refrigerant vessels (e. g. on high-pressure liquid receivers, intercoolers and low-pressure receivers) and to devices connected to other parts of a refrigerating system (e. g. oil-level sight glasses on a compressor). This European Standard applies to those types of level indicators that are direct and indirect reading devices (e. g. sight glasses, frosting tubes), and includes electrical and pneumatic indicators. This European Standard describes the procedure to be followed when designing (by calculation or by an experimental design method) level indicator parts subjected to pressure as well as the criteria to be used for the selection of materials. This European Standard applies to the design of level indicators with respect to pressure containment and describes methods by which the reduced impact values at lower temperatures may be taken into account in a safe manner. It also gives guidance on some aspects of application and installation.
EN 12178:2016 Referenced Document
2014/68/EU-2014 DIRECTIVE OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment (recast; Text with EEA relevance)
EN 12284:2003 Refrigerating systems and heat pumps - Valves - Requirements, testing and marking
EN 378-1:2008 Refrigerating systems and heat pumps - Safety and environmental requirements - Part 1: Basic requirements, definitions, classification and selection criteria
EN 378-2:2008 Refrigerating systems and heat pumps - Safety and environmental requirements - Part 2: Design, construction, testing, marking and documentation Incorporates Amendment A1: 2009
EN 60529:1991 Degrees of Protection Provided by Enclosures (IP Code) (Incorporates Amendments A1: 2000 and A2: 2013)
EN 764-4:2014 Pressure equipment - Part 4: Establishment of technical delivery conditions for metallic materials
EN 764-5:2014 Pressure equipment - Part 5: Inspection documentation of metallic materials and compliance with the material specification
EN ISO 6708:1995 Pipework Components - Definition and Selection of DN (Nominal Size) (ISO 6708 : 1995)
ISO 7268:1983 Pipe components; Definition of nominal pressure
EN 12178:2016 history
2016EN 12178:2016 Refrigerating systems and heat pumps - Liquid level indicating devices - Requirements@ testing and marking
2003EN 12178:2003 Refrigerating systems and heat pumps - Liquid level indicating devices - Requirements, testing and marking