Life of heat meter
At present, nearly all of China's enterprises have begun to research and improvement, the production of Ultrasonic heat meter ultrasonic heat meter. From last two years dozens of things reported to the Ministry of housing and connected achievements could be observed, many of the emphasis on the study has focused around the flow meter's mechanical structure design and style in the base table, only some involve sensor output signal processing; usually ignored on properties of ultrasonic devices studies, some even around the key technical parameters must realize.
To begin with: about 60% on the heat meter when enterprise outsourcing ultrasonic transducer, did not submit sufficient and extensive technical performance parameters. Greater than half in the ultrasonic transducer technical parameters provided by the manufacturer has clearly incorrect; or too easy, main parameter isn't supplied or not the measured deviation is large.
By way of example: almost all of the heat meter ultrasonic transducer nominal center frequency is 1MHz. Actual outcome: just 30% 1MHz 5%; maximum deviations of greater than 12%. Possible to argue: For those who can tune on the circuit compensated, paired with center frequency is just not 1MHz feasible; the issue is: 80% per cent in the producers ignored flowmeters ultrasonic transducer pairs of other essential parameters, including, capacitor, electrical conductivity, mechanical high quality aspect, impedance, and so forth. These parameters modify with temperature will have an effect on the ultrasonic wave propagation time difference that is the precision of Ultrasonic Flowmeter in water. Beneath precisely the same conditions, domestic and imported flowmeters ultrasonic transducers for these 5 measurements of static parameters are: Center frequency offset 1%; four other folks parameters matching deviation: 4%; domestic Woltman heat meters flowmeters ultrasonic transducers can reach this level are extremely uncommon. That gap, it can't be ignored.
Even with great base and signal processing circuit style, when you followed the poor and with out aging by ultrasonic transducer, not merely tends to make the heat flow measurement does not meet the technical requirements, may perhaps also be measured in irregular and may compensate for the adjustments within the running to shorten the service life in the heat meter.
