Manual for M-BUS Valve Controlled Water Meter

Manual for M-BUS Valve Controlled Water Meter

The M-BUS valve controlled water meter uses reed switches, Hall sensors, and other methods to read character wheel data. Compared with traditional pulse meters, it can reduce reading errors to zero. It is an electronic remote water meter with zero electromechanical conversion errors in automatic meter reading systems and adopts a low-power design. It usually does not require power supply and only needs to be powered during meter reading or valve operation.
The photoelectric direct reading valve controlled water meter adopts a rotor type measuring structure, which has the characteristics of high measurement accuracy, small starting flow rate, convenient meter reading, beautiful appearance, safety and hygiene, and long service life.
M-BUS valve controlled water meter, combined with intelligent meter reading system equipment, completes intelligent reading of residential areas
Provide water, electricity, and gas meter data and achieve data sharing with the settlement center through networking.
1、 Product features
Directly reading character wheel data, compared to traditional pulse meters, it can reduce reading errors to zero;
Adopting low-power design, power supply is only required for reading and valve opening and closing;
Adopting advanced data encoding and verification techniques, with high communication reliability;
Adopting a rotor type measuring structure, it has high measurement accuracy, convenient meter reading, and beautiful appearance;
Compliant with the standard of Electronic Remote Water Meter (CJ/T 224-2012);
The traffic performance meets the GB/T 778.1-3-2018 standards, with an accuracy level of 2;
Compatible with multiple communication protocols; DL/T645, CJ/T188 and internal protocols;
Meet the design requirements for electromagnetic compatibility of electronic products such as EMC, ESD, EMI, etc., and reach the industry's * level;
Combined with the upper computer system, establish a remote automatic meter reading management system to truly achieve meter reading and monitoring automation.
2、 Technical parameters
Product model: LXSY-15/20 FK;
Working voltage: DC 36V;
Working current:
Meter reading working current ≤ 9.0mA
Static working current ≤ 1.3 mA
Valve on/off bus current ≤ 50 mA
Valve open/close motor valve input current ≤ 30 mA
Working environment: Water temperature: 0.1 ℃~+45 ℃ Humidity: 0~95% RH;
Storage temperature: -25 ℃~+65 ℃;
Allowable water pressure: 1 MPa;
Pressure loss: 0.063 Mpa;
Valve type: motor valve;
Communication method with the upper computer: M-bus fieldbus;
Communication transmission rate: 2400 baud;
Communication protocols: DL/T645, CJ/T 188, and internal protocols (or user specified protocols)
Communication transmission distance: 300m; (Communication line specification AVVR2 × 0.75)
Single meter valve opening/closing time: 8S;
Bus pin ESD protection exceeds 10kV;
Short circuit current protection;
Protection against bus open circuit, short circuit, idle and other faults.
3、 Traffic parameters
Model nominal caliber
DN (mm) accuracy
Grade Overload Flow Q4 Common Flow Q3 Boundary Flow Q2 Minimum Flow Q1
m³/h
LXSY-15FK 15 Level 2 3.125 2.5 0.050 0.030
LXSY-20FK 20 Level 2 5.00 4.0 0.080 0.050
LXSY-25FK 25 Level 2 7.875 6.3 0.128 0.080





Overload flow (Q4) - The flow rate that requires the water meter to meet the allowable error requirements in a short period of time and then maintain its metering characteristics under rated working conditions;
Common flow rate (Q3) - * flow rate under rated working conditions. At this flow rate, the water meter should operate normally and meet the allowable error requirements;
Boundary flow rate (Q2) - the flow rate that occurs between the commonly used flow rate Q3 and the minimum flow rate Q1, dividing the flow range into two zones with specific allowable errors: the "high zone" and the "low zone";
Minimum flow rate (Q1) - the flow rate that requires the reading of the water meter to comply with the allowable error.
*Allowable error:
The allowable error in the low zone from including the minimum flow rate (Q1) to excluding the boundary flow rate (Q2) is ± 5%;
The allowable error from the boundary flow rate (Q2) to the high zone including the flow rate (Q4) is ± 2%.
4、 Installation dimension diagram
Caliber length L length L1 width B height H connection thread weight
Copper shell connecting wire
mm d D kg m
DN15 258 165 85 116 R1/2 G3/4 approximately 1.4 0.8
DN20 298 195 85 116 R3/4 G1 approximately 1.7 0.8
DN25 345 225 86 118 R1 G1 1/2 approximately 2.5 0.8


5、 Installation, use and maintenance methods
1. The diameter of the water meter should be selected based on the flow rate at the installation location;
2. The installation location should avoid exposure to sunlight, freezing, pollution, moisture, and flooding, in order to facilitate disassembly and meter reading. During the freezing period, in addition to wrapping the water meter and water pipe, the inlet valve of the water meter should be closed when not in use, and the outlet valve and water * should be opened to prevent the water meter from expanding and being damaged due to freezing. Suggest installing it in a dedicated water meter box;
3. The water meter should be installed horizontally, with the face up and the arrow pointing in the same direction as the water flow;
4. When installing a new pipeline, it is necessary to wash away any debris such as stones, mud, hemp fibers, etc. inside the pipeline before installing the water meter to avoid water meter malfunction.
For accurate measurement, the water level should be higher than the water meter.
If the water meter is installed at the inlet pipe of the boiler, measures should be taken to prevent hot water from flowing back and damaging the water meter.
7. The water meter should not be directly connected to the pipeline. The water meter should be connected to the pipeline through a connecting pipe, sealing gasket, and connecting nut. When disassembling the water meter, do not apply force to the hard plate to avoid twisting the case.
8. The water meter should avoid excessive stress caused by pipes and fittings. When necessary, the water meter should be installed on a base or bracket.
Valves should be installed before and after the water meter for easy maintenance and replacement.
6、 Accessories
Accompanying each water meter are 2 pipe joints, 2 connecting nuts, and 2 sealing rings, 1 certificate of conformity, and 1 product manual per box.