According to EN 1434, the website’s ultrasonic heat meters are of utmost precision. The uncertainty of measurement does not exceed 2%. For flow measurement, dual ultrasonic transducers are utilized. Temperature sensors (Pt1000) calculate the difference of enthalpy for the accurate billing of the system. A microprocessor moderates temperature and/or pressure compensation on real-time basis. Noise is diminished with digital signal processing which also has other functions. Field tests conducted in the Northernmost parts of China illustrate reliability. Other tests show stable results after long periods without use. 200,000 to 300,000 units per year ensure reliability. Reach out for tracerable calibration documents to trace national standards