一、Product Summary
Ultrasonic water meter is used to accurately measure the flow rate. The product has the characteristics of beautiful appearance, convenient installation, accurate measurement, stable operation, strong anti-pollution and anti-corrosion capability, long service life, small pressure loss, economy and practicality, etc. It is suitable for flow metering and charging of domestic water, central air conditioning system water, etc.
Implementation standard: GB/T 778 Measurement of water flow in closed full pipeline Drinking cold water meter and hot water meter JJG 162-2009 Cold water meter
二、Working Principle
Ultrasonic water meter adopts the principle of ultrasonic wave. It is a kind of water meter that further calculates the flow rate of water by analyzing and processing the time difference caused by the change of speed when ultrasonic sound beam propagates downstream and countercurrent in water.
三、Function List
|
Serial Number |
Functions |
Comments |
|
1 |
Master control chip |
Low-power MCU HC32L130; |
|
The main frequency is 4MHz; |
||
|
2 |
Ultrasonic metering function |
Calculate the forward and reverse flow rate with an accuracy of 1ml (the reverse current version is not calibrated); |
|
Forward and reverse flow velocity; |
||
|
Installation direction detection; |
||
|
Air traffic control or sensor fault alarm; |
||
|
Leakage alarm (principle: the flow rate lasts for 1.5 days and the time is not 0, and the time can be changed); |
||
|
Water pipe burst alarm (principle: flow rate is greater than a certain value, value to be determined); |
||
|
It is divided into normal operation mode and verification mode; |
||
|
In the verification mode, the last flow rate is automatically cleared every time it is re-verified; |
||
|
The detection time difference is 2 times within 1S (in the main cycle, each low power trigger will be executed); |
||
|
There are 10 times of head removal and tail removal average algorithm for time difference; |
||
|
The flow coefficient is compensated by interpolation algorithm; |
||
|
2s calculate a flow value; |
||
|
3 |
Water Metering Data History Memory Local (Precision 1L) |
For the latest 90 days, the metering data is stored hourly |
|
The latest 180 days, the measurement data is stored every day |
||
|
In the latest year, monthly measurement data are stored |
||
|
4 |
Power supply |
Last applied board power supply (3.6 V) |
|
5 |
Supply voltage detection |
Not supported by current version, not supported by hardware |
|
6 |
Abnormal half interrupt detection |
When the exception half interrupt, the log will be automatically output (mainly used during debugging) |
|
7 |
EEPROM Save |
Log Open Flag |
|
Forward flow (1mL) (keep it if there is a difference in one minute, and consider lengthening it later) |
||
|
Reverse flow rate (1mL) (keep it if there is a difference in one minute, and consider lengthening it later) |
||
|
Pipe section information 15, 20, 25 (use this parameter later and modify the calculation parameters) |
||
|
Number of flow points and calibration information |
||
|
Modbus Address |
||
|
Meter Address |
||
|
Historical data preservation (Ref. 3) |
||
|
8 |
Valve control |
Operating motor on-off valve |
|
9 |
External Interface |
UART interface (supports CJT188 protocol) |
|
10 |
CJT188 protocol |
Refer to CJT188 Protocol Section |
|
11 |
Infrared Configuration (Log Output) |
Use AT instruction infrared to set/read table parameters (refer to AT protocol section below for AT instruction) |
|
Debug Log |
四、Performance characteristics
1. There are no moving parts in the ultrasonic water meter body, mechanical wear can be used stably and reliably for a long time, and measurement accuracy can be maintained for a long time.
2. The ultrasonic water meter has a large range ratio and a small initial flow rate, and the range ratio of the water meter can reach: R250, R400; The initial flow rate of the water meter can be as small as 2-3 liters per hour.
3. The measurement accuracy of ultrasonic water meter is after operation, but factory inspection can be required according to Grade 1 accuracy standard.
4. Ultrasonic water meter has strong adaptability to fluid temperature changes, and can achieve T30/T50/T70 temperature grade.
5. Ultrasonic water meter has strong antistatic and anti-magnetic interference capabilities, and antistatic can reach more than 12000V V.
6. The ultrasonic water meter adopts micro-power consumption design technology to minimize the comprehensive power consumption of the water meter and has a service life of more than 6 +2 years.
7. Ultrasonic water meter can choose a variety of communication modes, such as NB-IOT. LoRa, LoRaWAN, M-Bus. RS485, pulse, etc., and is equipped with infrared communication mechanism, through which instrument parameters can be configured or instrument data can be read.
8. Ultrasonic water meter has the function of long-term data storage, which can realize data storage and recording of year, month and day, which is beneficial for management departments to analyze water consumption big data and make reasonable water consumption decisions.
9. Ultrasonic water meter has a water flow direction identification mechanism, which can measure forward and reverse flow, and can adopt a variety of forward and reverse flow statistics and display methods, so as to use units for data analysis.
10. The ultrasonic water meter has an alarm mechanism for long-term water running (leakage alarm) and an oath reporting mechanism for a single water running exceeding a preset amount, which can timely remind users whether there is water leakage in the household water pipe and whether they forget to turn off the faucet.
11. The ultrasonic water meter has an empty pipe alarm mechanism, which can be used as an abnormal disassembly alarm after running water normally for a long time.
12. The ultrasonic water meter has an error counting (instantaneous excessive flow metering) judgment mechanism. When an error counting occurs, it can give an alarm in time and record the error time. When an error counting occurs, the MCU software in the meter has an error correction mechanism, which can prevent the occurrence of an error counting to the greatest extent.
13. Ultrasonic water meter has the function of measuring fluid water temperature, and can give low temperature or high temperature alarm, so that the management department can deal with it in time.
14. The combination of ultrasonic water meter and management system can have a family water care mechanism. When the family children are not with the elderly, the children or the community where the elderly are located can know the water habits of the elderly through mobile phone APP, which can give early warning in time.
15. The valve-controlled ultrasonic water meter has a valve control function. The control of valve opening and closing can be executed by issuing corresponding commands through wireless communication. In addition, corresponding valve opening and closing conditions can also be set in the water meter to execute corresponding valve actions.
五、Technical Parameters
|
Caliber |
DN15 |
DN20 |
.. |
|
Minimum Flow (Q1) |
0.01 |
0.016 |
.. |
|
Common Flow (Q2) |
2.500 |
4.000 |
.. |
|
Maximum Flow (Q3) |
3.125 |
5 |
.. |
|
Range ratio |
250 |
||
|
Accuracy grade |
Class B |
||
|
Working pressure |
≤ 1. 6MPa |
||
|
Pressure loss |
P40 |
||
|
Level of protection |
IP65 |
||
|
Working water temperature |
5 ~ 55 ℃ |
||
|
Communication mode |
Lorawan/NB/GPRS/RS485 |
||
|
Power supply |
3.6 V |
||
|
Key |
Magnetic induction button |
||
|
Screen |
LCD8 bits |
||
|
Display Range |
0 m ³ ~ +99999.999 m ³ |
||
六、Product structure and size
| cal | DN15~25 |
| Range ratio | R250 |
| Accuracy class | Grade B |
| working pressure | ≤1.6Mpa |
| Pressure loss | Δp40 |
| Level of protection | IP65 |
| Communication mode | Lorawan / NB / GPRS / RS485 |
| Power supply | 3.6V |
| Key | Magnetic induction button |
| Screen | LCD8 bits |
| Display Range | 0m³～＋99999.999m³ |
