| Along with the correlative documents of "heat energy need calculate"and "heat meters must be verified before installed"are put forward,what device to use for verifying heat meters become a hot point concerned by everyone.Currently, the verification device of heat meter is in the stage of development.The caliber scope of the heat meters,which can be verified by The verification device of heat meter set up by some interprovincial metrological service,is generally DN15～DN25 or DN15～DN50.The heat meters above DN50 is verified separately,the flow sensor is still verified in cold water. The temperature dissimilarity of the water influences the accurate degree of the flow sensor directly.In this text,the verification /calibration device of heat meter, simulating heat pipeline,can calibrate the heat meters online;it can also verify flow sensors in hot water. The caliber of heat meters can be calibrated is from DN20 to DN125.Its flow scope is 0.05m~3/h～130m~3/h,and its temperature scope is 4℃～95℃.The hot water flow standard facilities, which combined static weight method with master meter method,can verify master meter on line.It can also improve the accurate degree and the efficiency.The hardware part choses to use the FX2 PLC,which is made by Mitsubishi company,can accept both analog signals and impulse signals.So it increasie the verify scope of heat meter.This device can also test the performance of heat exchanger. Pass to test the influence of heat transfer coefficient ,brought by hot water,a curve of heat transfer coefficient under the different current velocity can be got,which is very important to the design and the research work of heat exchanger.
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