Material: Ductile iron and cast copper
Accuracy:
Maximum allowable error @ Q1~Q2: ±5%.
Maximum allowable error @ Q3-Q4: water temperature 0.1~30℃, max permissible error: ± 2%; water temperature >30℃, max permissible error ± 3%.
Sensor type: Photoelectricity direct reading type
Communication type: Mbus
Power Supply: DC21 -42V
Description
Dry-Type Direct Reading Water Meter ( DDR water meter) is Hanwei self-developed DDR water meter. It is convenient for remote meter reading and control for the actual needs of daily water consumption.
It adopts M-BUS"RS485 bus mode communication to realize the remote direct reading of the water qty consumed. It can effectively avoid the door-to-door meter reading by the water company/bureau.
This product also has an optional valve control function, it enable water company/bureau to control the water consumption by DDR water meter, making remote meter reading and control more convenient and reliable. It can greatly save manpower & cost, improve productivity.
Features
Adopts direct reading on the meter dial wheel.
No need to set parameters
No cumulative reading error.
Adopt low power consumption design, only consume power when reading.
Advanced data encoding and verification methods, secured and reliable communication .
Can be integrated into water management platform system, realize automation in water meter reading and water management.
No interference from reading device on the primary water meter.
Each meter has a unique address code, Mbus connection, simple wiring.
The surface of the water meter is permanently clear.
The shell is made of Ductile iron and cast copper.
Application
Residential & Commercial buildings
Old community renovations
Schools, urban and rural water supply
Urban road greening water
Farmland irrigation etc.
Specifications
| Mechanical part | |||
| Parameter | unit | Value | |
| Nominal diameter (DN) | mm | 15 | 20 |
| Minimum flow (Q 1 ) | m3/h | 0.025 | 0.04 |
| Boundary Flow (Q 2 ) | m3/h | 0.04 | 0.06 |
| Common flow (Q 3 ) | m3/h | 2.5 | 4 |
| Overload flow (Q 4 ) | m3/h | 3.125 | 5 |
| Q 3 /Q 1 (R) | 100 | ||
| pressure loss | 0.063MPa | ||
| Pressure Level | MAP10, normal ≤ 1.0MPa, short time ≤ 1.6MPa | ||
| water temperature | Temperature: 0.1～+45℃ ( cold water ) | ||
| Electrical part | |||
| Working Power | DC2 1 -42V (MBUS interface) | ||
| Working Current | Static current: <1.2mA , instantaneous working current for meter reading: <12mA | ||
| Ambient Temperature | Temperature: -20 ℃～+45℃ , Humidity: 0～ 100 %RH | ||
| Degree Of Protection | IP68 | ||
| Valve Function | optional | ||
| Way Of Communication | Wired M-BUS bus communication or wired RS485 communication | ||
| Communication Transmission Rate | 1200/2400/4800/9600bps optional | ||
| Communication Distance | ≤300m | ||
| Letter Of Agreement | " 188 Communication Protocol" or ModBus protocol , and the protocol can be customized | ||
| Protection Mechanism | Bus open circuit protection , short circuit protection , overvoltage protection, overcurrent protection |
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