Abstract
Smart water meter, which incorporates IoT (Internet of Things) technology, is receiving high attention due to recent development of information and communication technology. If traditional mechanical water meters are replaced by electronic ultrasonic water meters, micro flow rate can be measured and the measurement uncertainty can be improved due to the age of use. This enables smart metering such as AMR (Automatic Meter Reading) or AMI (Advanced Metering Infrastructure) as well as various water related services. In this paper, a low power ultrasonic water meter will be designed to operate with a battery for a long period of time. A water meter shall be designed to operate for at least 9 years, which is the requirement for type approval. In this paper, a low-power modeling is performed for battery-operated ultrasonic water meter to work for at least 10 years. The proposed low power embedded system model will be verified with actual test circuits.
Highlights
The operating period required by the type approval of a water meter shall be 8 years
The method of obtaining the flow rate using Eq.2 is called differential time of flight method in order to distinguish it from the ultrasonic wave transit time difference method (Lee et al, 2017)
In order to model the power consumption of the ultrasonic water meter, the notations for voltage and current consumption are listed in Table 1 for the microcontroller (MCU, STM32L162) and the front-end chip (FE, MAX35101), respectively
Summary
The operating period required by the type approval of a water meter shall be 8 years. It can measure the flow rate of a small diameter pipe such as a water meter in home. Both a pair of ultrasonic transducers and a pair of ultrasonic reflectors are installed on the upstream and downstream of the pipeline through which water flows. In order to model the power consumption of the ultrasonic water meter, the notations for voltage and current consumption are listed in Table 1 for the microcontroller (MCU, STM32L162) and the front-end chip (FE, MAX35101), respectively.
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