Smart IC card meter technical indicators and parameters of an advantage, can be recorded on the water and electronic display; 2, can be controlled in accordance with the agreement of the water, and automatically calculate the price ladder to complete the water, while the water can be stored data function ; 3, data transfer and transaction settlement by the IC card, with easy transaction, accurate calculation can be performed using the bank settlement characteristics. 3 Install one, select the correct caliber meter; 2, horizontal mounting surface facing up, and the flow direction arrow on the case in the same direction. Installation location should avoid exposure, flooding, freezing and pollution, easy accessibility, meter reading. Be sure to put the newly installed pipeline pipeline gravel, flax and other debris washed clean and then install the water meter, water meter in order to avoid failure; 3, the meter should be installed downstream of the valve, should be used to ensure that the full open; 4, to be installed downstream of the meter necessary or its equivalent straight pipe rectifier requires upstream straight pipe lengths not less than 10D, downstream straight pipe length is not less than 5D (D for water meter nominal diameter). For vortex phenomenon caused by bending or centrifugal pumps must be installed in front of straight pipe rectifier; 5, when the meter is installed, it should be noted meter downstream pipeline outlet 0.5m higher than the meter to prevent the meter due to lack of water in the pipe caused incorrect measurement; 6, excellent anti-blocking properties of the water meter, but stay within the pipe sediment silt and weeds is sensitive, in the course should be avoided. If there is silt sediment and weeds should be left to clean up, otherwise it will affect the normal water meter pipe. 4 Note 1, proof must cover after replacing the battery cover, tighten the screws, otherwise it does not work and the card table display E - 5. 2, periodically check the operation of the smart meter, winter frost attention. 3, has been installed in the pipeline but not delivered long-term use (more than a week), please do not use water or close the smart meter before and after the valve, the company does not bear the consequences resulting therefrom. 4, if the smart meter display does not appear consistent with the character of electronic wheel or smart meter malfunction, whichever word metering wheel. 5 metrological characteristics 1. Conditions: Water temperature 0.1 ~ 30 ℃ 2 pressure rating:. MAP10 3. climatic and mechanical environmental safety class: Class C 4. EMC rating: E2 5. flow profile sensitivity levels: U10 D5 6. Pressure loss rating: △ P25 7. The maximum permissible error. First, the main technical performance 1, the working environment temperature: 0-60 ℃ 2, relative humidity: ≤85% 3, the measured water temperature: cold water table 0-50 ℃; water table 0-90 ℃; pure water meter 0-35 ℃ 4, working pressure: 0.02MPa ~ 1MPa 5, the technical parameters: accuracy class and flow range (see table below) nominal diameter (DN) mm maximum flow metering rating Nominal flow Qn Qmax transitional flow Qt minimum flow Qmin minimum starting flow Qs≤ Reading the maximum reading m / hm 15 A 3 1.5 0.150 0.045 0.014 0.1 99999.9 B 0.120 0.030 0.010 20 A 5 2.5 0.250 0.075 0.019 B 0.200 0.050 0.014 25 A 7 3.5 0.350 0.105 0.023 B 0.280 0.070 0.017 6 test method is based on the smart meter test technical conditions of the production companies and GB / T778 conducted. Test items: visual inspection (including dimensions, etc.), hydrostatic test, showing error, flow measurement and accelerated wear test. When the number of subjects meter least three, there is a need to increase the number of meters to be tested for up to 10.