The optical reading prepaid water meter is a high-performance metering instrument that is innovatively integrated with optical sensing technology and intelligent communication modules based on the traditional mechanical multi-flow rotor dry-type water meter. This model adopts advanced integrated photoelectric reading technology, with the sensor completely isolated from the mechanical counting gear, without any physical contact; the counting part undergoes special vacuum treatment, effectively isolating the outside air and the measured water body, thus permanently maintaining a clear reading window and eliminating the common glass fogging phenomenon in ordinary water meters; the dial head adopts multi-layer sealing and waterproof technology, and has reliable anti-magnetic interference capability.
This product is designed with ultra-low power consumption, requiring no external power supply during daily standby, and only obtaining the required power through the system bus when conducting meter reading or driving valve actions. The core of the water meter adopts the classic rotor-type metering structure, featuring high metering accuracy, small starting flow, convenient remote reading, exquisite appearance, hygiene and safety, and long service life. The meter is connected to the data collection device through M-BUS or RS-485 bus, enabling remote intelligent meter reading of water usage data and networking with the background settlement management center to achieve real-time data sharing.
Core parameters of the optical reading prepaid water meter
Electrical characteristics
Working voltage: DC 36V
Meter reading working current: ≤ 9.0 mA
Static working current: ≤ 1.3 mA
Valve action bus current: ≤ 50 mA
Valve drive motor current: ≤ 30 mA
Environmental adaptability
Operating temperature: 0℃ ~ 40℃ (cold water meter); 0℃ ~ 90℃ (hot water meter)
Operating humidity: 0 ~ 95% RH
Storage temperature: -25℃ ~ +65℃
Operating water pressure: ≤ 1 MPa
Pressure loss: ≤ 0.063 MPa
Communication and performance
Communication method: M-Bus fieldbus
Transmission rate: 2400 baud
Communication protocol: Supports DL/T645, CJ/T 188 and custom protocols
Maximum communication distance: 300m (using AVVR 2×0.75 cables)
Valve opening and closing time: Approximately 8 seconds
Bus ESD protection: ≥ 10 kV
Includes bus open circuit, short circuit and idle fault protection functions
Measurement accuracy: Complies with ISO4064 B-level standard
Core product advantages
1. True “direct reading” without error: Directly read the numerical value from the counter’s digit wheel window, without the need to set the meter base, table constant, and not relying on data storage and cumulative conversion. This fundamentally eliminates cumulative errors. The electronic part is completely isolated from the mechanical counter, without affecting the original measurement accuracy.
2. Direct and robust data: Digital readings are directly transmitted instead of pulse signals that are susceptible to interference. It has excellent immunity to mechanical vibrations and electromagnetic interference, ensuring stable, accurate and reliable operation even in complex environments.
3. Low power consumption, maintenance-free: During daily operations, no continuous power supply is required. Only during the instant read/write process is power supplied by the bus. This revolutionary design eliminates the possibility of measurement errors caused by power failures and significantly reduces the maintenance workload and complexity of the system.
4. Consistent reverse reading: By directly identifying the mechanical position of the meter wheel, even if the water meter is reversed, the remotely read data will always remain consistent with the actual reading on the dial, ensuring the uniqueness and authority of the measurement.