... straight-through design 304 stainless steel Encrust-preventing Ultrasonic Heat Meter 10years quality assurance Full straight-through ... cover(433MHZ aneennas or infrared optoelectronic interfaces)2,Ultrasonic transducer 10,Locking cover3,Stainless steel cover 11 ... ,related to the principle of heat measurement.temperatue sensors,flowsensors, digital communication technology ststems, and computer ...