BS EN 15848:2010 pdf free.Water conditioning  equipment inside buildings Adjustable chemical dosing systems—Requirements for performance, safety and testing.
BS EN 15848 This European Standard specifies definitions, principles of construction (but not dimensions) and design,requirements on performance and operation as well as methods for testing the performance of adjustable chemical dosing systems for conditioning water intended for human consumption inside buildings (see [1] which are permanently connected to the mains supply.
The concentration in the treated water of the active chemical(s) as well as of any other ingredient or minor component (including possible contaminants) should not exceed the parametric values laid down in the existing legislation in the Member States for the water intended for the human consumption, as implemented by the national authorities.
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 55011, Industrial, scientific and medical (ISM) radio-frequency equipment一Electromagnetic disturbance characteristics一Limits and methods of measurement (CISPR 1 1:2003 + A1:2004, modified)
EN 60204-1，Safety of machinery- Electrical equipment of machines- Part 1: General requirements(IEC 60204-1:2005, modified)
EN 60335-1，Household and similar electrical appliances- Safety 一Part 1: General requirements(IEC 60335 1:2001, modified)
EN 60335-2-41, Household and similar electrical appliances 一Safety 一Part 2-41: Particular requirements for pumps (IEC 60335-2-41:2002)
EN ISO 12100-1，Safety of machinery- Basic concepts, general principles for design- Part 1: Basic terminology, methodology (ISO 12100-1:2003)
EN ISO 12100-2, Safety of machinery一Basic concepts, general principles for design- Part 2: Technical principles (ISO 12100-2:2003)
A dosing system comprises the fllowing elements:
a) storage tank or chemical container which contains the chemical as a liquid that will be dosed into the water pipe;
b) suction device which comprises a suction hose and a foot valve;
c) low level detection avoiding the pump to work when storage is empty;
d) dosing pump that pumps the chemical as a liquid from the storage tank or container and doses it into the main water flow;
e) overpressure valve as safety apparatus to avoid overpressure in the injection device;
f) injection device which comprises the hose between the pump and the mains, the injection valve and the backflow preventer;
g) water meter in the main water flow which transmits a control signal to the dosing pump.BS EN 15848 pdf download.