1. Introduction to photoelectric direct reading water meter
Photoelectric direct reading water meter is mainly used to measure the total volume of water flowing through the water pipe, suitable for small industrial water and domestic water. The use of photoelectric principle on the table code code to make the reading more direct and more accurate. Management departments can use remote meter reading method directly read the header information, instead of manual meter reading, more convenient and faster.
2. Main features
A. Base table in line with GB / T 778.1 ~ 3-2007 measurement level standard (equivalent to international standards ISO 4064-1 ~ 3: 2005.IDT) requirements;
B. Electronic devices comply with CJ / T 224-2012 "Electronic remote meter" standard;
C. communication protocol in line with CJ / T 188-2004 "household measurement instrument data transmission technology conditions";
D. use of non-contact sensor, does not affect the original performance of mechanical water meter;
E. using a special coding, no dead zone reading, mechanical readings and electronic readings consistent;
F. use low-power design, only when the reading required power supply;
G. using M-BUS bus interface, no polarity, easy installation, easy maintenance;
H. can be combined with the meter reading system, the establishment of remote automatic meter reading management system, the real meter reading automation;
I. Reliable performance and good water resistance.
3. Service conditions
a)Temperature rating:T30
b)Pressure rating:MAP10
c)Pressure loss rating:△P63
d)Upstream flow field sensitivity rating:U10
e)Downstream flow field sensitivity rating:D5
f)Ambient humidity:≤93%RH
g)Climate and mechanical environment rating:Class B
h)Electromagnetic environment rating:E1
i)Non-measurable negative test
4. Indication error
a)Low area(Q1≤Q≤Q2)The maximum allowable error is ±5%
b)High area(Q2≤Q≤Q4)The maximum allowable error is ±2%
5. Main technical parameters
Nominal diameter DN (mm) | Overload flow Q4 (m3/h) | Common flow Q3 (m3/h) | Boundary flow Q2 (m3/h) | Minimum flow rate Q1 (m3/h) | Range ratio R(Q3/Q1) | Accuracy Grade | Minimum reading(m3) | Maximum reading (m3) |
DN15 | 3.125 | 2.5 | 0.05 | 0.03125 | 80 | level 2 | 0.0001 | 9999.9999 |
0.040 | 0.025 | 100 | ||||||
0.032 | 0.020 | 125 | ||||||
DN20 | 5 | 4 | 0.08 | 0.05 | 80 | |||
0.064 | 0.040 | 100 | ||||||
0.0512 | 0.032 | 125 | ||||||
DN25 | 7.875 | 6.3 | 0.126 | 0.07875 | 80 | |||
0.1008 | 0.063 | 100 | ||||||
0.08064 | 0.0504 | 125 |
6.Overall size and weight
Nominal diameter | Length(L) | Width(W) | Height(H) | Height (H1) | Weight | Threaded connection | ||
mm | Kg | d | D | |||||
DN15 | 165 | 90 | 110 | 210 | 1.5 | R1/2 | G3/4B | |
DN20 | 195 | 90 | 110 | 210 | 1.8 | R3/4 | G1B | |
DN25 | 225 | 95 | 120 | 220 | 2.2 | R1 | G1 1/4B |
7.Flow error curve
8.Pressure loss curve