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DN15/20/25mm LoRaWAN Smart Water Meter for Cold and Hot Water
The wireless smart water meter consists of remote based water meter, wireless communication modules and other components. This product can complete the data collection of point-to-point through the gateway with low power consumption, long life and two-way data transmission. It
provides reliable protection for the accurate collection of real-time data; Wireless water meter uploads data to the gateway everyday automatically, then the gateway uploads data to the network platform automatically; This product is simple in structure, easy to maintain and replace, and connect with no cables. So, it is easy to install.
1. Operating environment:
Water temperature: 0.1℃～30℃
Protection grade: IP68
2. Operation water pressure: 0.03MPa~1.0MPa
3. Pressure loss: ≤0.1MPa
4. Main Parameters:
|Power Consumption||Static current consumption (wireless module doesn’t include counting sensor)||≤10µA|
|Wireless current receiving power consumption||≤18mA|
|Wireless current emission power consumption||About 120mA|
|RF center frequency||433MHz|
|Frequency bandwidth||125KHz,250KHz can be optional|
|RF power||20dbm(100mW) (Typical)|
|Transmission rate||0.25-50kbps (LoRaWAN)|
|Receiver sensitivity||-143dBm @SF12/BW 125KHz|
|Power supply||3.6V lithium battery||More than 10 years|
|Sampling Method||Hall sensor, double pulse||Pointer sampling at 0.01, addend when positive rotation, subtrahend when inverse rotation.|
|Maximum flow rate||Q4||m3/h||3.125||5.0||7.875|
|Permanent l flow rate||Q33||
|Transitional flow rate||Q22||0.05||0.08||0.126|
|Minimum flow rate||Q11||0.031||0.05||0.0787|
Maximum Permission Error (MPE)
Q1≦Q≦,Q2 MPE =+ 5% Q2≦Q≦Q4, MPE= + 2% (For hot water metering, MPE=+ 3%)
Dimensions and diagram
Allowable Maximum Error:
From the minimum flow to the low zone that does not include the demarcation flow: ±5%;
From the demarcation flow to the high zone including the overload flow: ±2%. 2.8 Communication Distance: City transmission distance: About 2km
The number of floors crossed: About 15 floors
Power Supply: The gateway needs an external 220V power supply; All prepaid costs are stored in the meter reading system. Based on the collected data of water consumption, it is determined whether the user owes fees.
LoRaWAN is a set of communication protocols and system architectures designed for LoRa long-distance communication networks. When the module is powered on, it automatically sends a join packet. If no reply from the gateway to the network, the join packet will be sent in intervals. After the module receives the network access permission message by the gateway, it pushes a packet of heartbeat data; Since then, it starts timing. Actively push a pack of heartbeat data at intervals of 6 hours. The data upload mechanism can be timed or quantitative or both, and can also be customized on demand.
Device uploads packets
|Address||A5 A4 A3 A2 A1 A0||Low byte first when sending|
|Data identification||00004200||Low byte first when sending|
|Data (Note 1)||XXXXXXXX||Low byte first when sending|
|Status word (Note 2)||XXXX||Low byte first when sending|
Note1: The data format is defined as follows:
|Data Format||Code System||Unit||Remarks|
|Accumulated Water Meter Reading||XXXXXXXX||BCD||Tons||
Cumulative water consumption
The decimal place defaults to 2 bits of data. The format is: XXXXXX.XX
Note2: Status word is defined as follows:
|Definition||Mandatory state||Strong magnetic interference||Overdraft status||Alarm status||Voltage||Valve status|
1.The water meter should be installed in a position where there is clean and dry and no direct sunshine or pollution or drowning.
2.The water meter should be installed horizontally, and the LCD should be upward.
3.Water flow must go with the same direction as indicated on the body of the water meter.
4.When assemble, the valve in front of water meter should be closed.
5.When assemble, the water meter should be covered to prevent from damage.
6.The water meter should be connected to the couplings first, and not directly to the water pipe. Extra parts include couplings and nuts.
Installation and Attentions:
The installation and use of water meters shall comply with the relevant provisions of Chapter 6 of Standard GB/T778.2-2007 and Article 6.3 of JJG162-2009.
1. The water meter to be purchased should be based on the flow rate often used in the pipeline, and it should be close to the usual flow rate of the water meter.
2. Before installing the water meter, foreign matter and contamination in the pipe should be removed.
3. The installation environment should be suitable, anti- freeze, anti-pollution, waterproof, anti-magnetic and prevent mechanical damage. Water meters should be easy to read, install, maintain, and disassemble.
4. The water meter should be installed horizontally. The arrows on the case should point in the same direction as the water flow in the pipe. The pipes connected to both ends of the water meter should be installed on the same axis to prevent the water meter and accessories from being damaged.
5. A stop cock or valve can be installed upstream of the water meter