Product use
It is used to measure the total amount of domestic tap water, hot water and direct drinking water, and has the function of intelligent charge and management; the water meter adopts the photoelectric direct reading technology to take the data of the word wheel, the meter and the collection equipment adopt the M-BUS or RS-485 bus connection, the remote intelligent reading, transmission data, opening and closing the valve intelligent instrument, which is suitable for small industrial water and domestic water measurement.
Product features
A zero reading error: photoelectric direct reading technology is used to read the data of the wheel, and the reading data at any time is consistent with the value of the mechanical wheel of the water meter, without accumulated error.
B. strong anti-interference ability: non-magnetic components, non-interference by magnetic substances, anti strong light interference ability of patented technology, self shielding function when encountering strong light interference in reading operation, to ensure accurate reading.
C long service life: adopt photoelectric direct reading technology for sampling, no mechanical contact and mechanical action, no failure due to external factors.
D use security: the data flow directly reaches the platform service terminal through the operator's base station, without any other intermediate network.
E. convenient installation: direct reading water meter + will lose data due to power failure and network failure.
G automatic initialization setting (applicable to M-BUS): the system can automatically complete the full-automatic initialization setting of all the equipment information in the system, including the full-automatic remote input of all the initialization information of the collector and the metering device, reducing the labor intensity of construction and avoiding the input error.
H high integration design: it can embed valve control module, integrated design and simplify wiring.
Design standard
GB / t778-2007 measurement of water flow in closed pipeline full pipe drinking cold water meter and hot water meter
CJ / t224-2012 electronic remote water meter
CJ / t383-2011 electronic direct reading water meter
Jjg162-2009 verification regulation of cold water meter
Rated working conditions
Flow range: q1-q3
Ambient temperature: 5 ° c-55 ° C
Ambient humidity: (0 ~ 100)% RH
Water temperature: cold water T30 ° C hot water T90 ° C
Water pressure: ≤ 1.0MPa
Water quality: tap water, direct drinking water, domestic hot water
Working power supply: M-BUS power supply DC22 ~ 36V
RS-485 bus power supply dc-12v
Product technical parameters
|
Nominal diameter（mm） |
15 |
20 |
25 |
|
Overload dischargeQ4（m3/h） |
3.1 |
5.0 |
7.8 |
|
Common dischargeQ3（m3/h） |
2.5 |
4.0 |
6.3 |
|
R=Q3/Q1 |
80，100，125, 160（Optional） |
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Range ratio |
Q2/Q1=1.6 Q4/Q3=1.25 |
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Pressure loss level |
Δp≦0.063MPa |
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Pressure grade |
MPA10 |
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Temperature class |
T30 |
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Flow characteristics |
accord with GB/T 778.1～3-2007standard，Accuracy level：Level 2 |
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Maximum permissible error |
High area(Q2≤Q≤Q4)by±2%，Low area（Q1≤Q＜Q2）by±5% |
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Water meter type |
Electronic remote cooling water meter with electronic device |
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Design standard |
CJT224-2012Electronic remote water meter |
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communication interface |
M-Bus/RS-485（Optional） |
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communication protocol |
CJT188/DLT645-1997/MODBUS |
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Communication rate |
1200,2400bps,4800bps,9600bps（Optional） |
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Power supply mode |
Bus-Powered |
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operating ambient |
0～+45℃（cold water）、0～+90℃（hot water）、0～95%RH |
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Connection mode |
The communication line of M-BUS water meter is not connected in polarity. Except for connecting the lead wire according to the wiring diagram of large caliber valve control meter, the other water meters with valve control function are the same.
See the following figure for RS-485 water meter wiring mode |
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Flow parameters
Model caliber（mm） Range ratio R Overload discharge Common discharge Boundary flow Minimum flow rate M3/h LXSNB-15E DN15 80 3.100 2.500 0.050 0.03125 LXSNB-20E DN20 5.000 4.000 0.080 0.0500 LXSNB-25E DN25 7.800 6.300 0.126 0.0787
note：Range ratioR=80/100/125/160，For detailed technical parameters, please call。
Maximum permissible error
B.The maximum allowable difference is ± 2% (when the water temperature is ≤ 30 ° C, ± 2%, when the water temperature is > 30 ° C, ± 3%) in the high zone including the boundary flow (Q2) and the overload flow (Q4)
Appearance and installation dimension
|
Model |
Long L |
Long L1 |
Board B |
Height H |
Connecting thread |
weight |
Connecting line |
|
|
㎜ |
d |
D |
㎏ |
m |
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LXSGY-15E |
260 |
165 |
90 |
130 |
R1/2 |
G3/4 |
=1.7 |
1-1.2 |
|
LXSGY-20E |
265 |
195 |
90 |
130 |
R3/4 |
G1 |
=2.6 |
1-1.2 |
|
LXSGY-25E |
345 |
225 |
96 |
140 |
R1 |
G11/4 |
=2.5 |
1-1.2 |
The communication line of M-BUS water meter is connected with the down reading bus of collector or collector, regardless of polarity, so as to avoid short circuit between communication lines or other metals such as meter case and pipeline.
2)RS-485 The wiring of water meter is shown in the figure below
Flow error and loss curve
