DDZY217(S18-1) Single Phase Multifunction Electronic Energy Meter is used not only for measuring the single phase a.c. active energy,but also for measuring theMaximumDemand,and it can be with Infrared port or RS485 for communication,and it is also with the function of multi-tariff and the anti-tamper,etc. It adopts the high quality long lifetime components and SMT manufacturing craft,and is reliable in performance.It conforms to the standards of IEC62053-21:2003,IEC62052-11:2003and IEC62056.