What is BS EN 16314 – AFD for gas meters about? 
BS EN 16314 is a European Standard that discusses gas meters and their functionalities.
The main objective of BS EN 16314 is to provide best industry requirements and tests for gas meters to demonstrate their performance with respect to additional functionalities.
BS EN 16314 specifies the additional requirements and tests for gas meters with a maximum capacity of 40 m3/h and a maximum operating pressure of not exceeding 500 mbar, conforming to EN 1359, EN 12261, EN 12480, EN 12405 and EN 14236, which have battery powered devices providing additional functionalities that form part of the gas meter (hereafter referred to as meter) or contained in an Additional Functionality Device (AFD).
BS EN 16314 also covers the additional requirements when an electronic index is used rather that a mechanical one, where the option of an integral valve to the meter is specified, this standard only gives requirements for meters having a maximum capacity not exceeding 10 m3/h.
BS EN 16314 is applicable to first, second and third family gases according to EN 437.
BS EN 16314 specifies the construction requirements for electronic components but communication protocols are dealt within other European Standards, e.g. appropriate parts of EN 13757.
BS EN 16314 applies to AFDs that are installed in locations with vibration and shocks of low
significance and in:
- Closed locations (indoor or outdoor with protection as specified by the manufacturer) with condensing or with non-condensing humidity or, if specified by the manufacturer:
- Open locations (outdoor without any covering) with condensing humidity or with non-condensing humidity
- Locations liable to temporary saturation
and in locations with electromagnetic disturbances corresponding to those likely to be found in residential, commercial buildings or similar buildings.
BS EN 16314 only covers valves integral to the meter.
Note: BS EN 16314 does not cover the changing of metrological software within the meter or the upload/download of metrological software.
Who is BS EN 16314 – AFD for gas meters for?  
BS EN 16314 on additional functionalities for gas meters is relevant to:  
- Manufacturers of gas meters 
- Quality control and testing personnel 
- Mechanical engineers 
- Product designers 
- Testing laboratories
Why should you use BS EN 16314 – AFD for gas meters?  
The AFD can be integral to the gas meter, attached to the meter or remote from the meter.
BS EN 16314 utilises the six functionalities agreed by the Smart Meters Coordination Group (SM-CG) as the basis for its additional functionalities.
BS EN 16314 contains requirements for gas valves integral within the meters and controlled by an AFD where the capacity of the gas meter does not exceed 10 m3/h. Such gas valves are intended for interruption of the gas supply but do not replace any valve intended to isolate the gas supply.
A number of methods that can provide the additional functionality for gas meters which are illustrated and described in detail in BS EN 16314.
BS EN 16314 walks you through the requirements and tests for AFD. It covers guidance on the security of AFDs, power system and marking requirements along with requirements for valve type test plans.
The test methods can demonstrate the performance of AFDs when subjected to high temperatures, various climatic conditions, mechanical vibration, amongst other parameters. Ageing tests are also covered.
Thus, if you are a manufacturer of gas meters, by adopting BS EN 16314 guidelines you can determine the additional functionalities that can be incorporated to provide long-term stability of the AFD without loss of data.
