Hhsc-i electronic water gauge

  Please read the instructions carefully before installation and use
 
 
 
 
 
 
 
Hhsc-i electronic water gauge
 
an instruction manual
(without conversion box)
 
 
Xuzhou Haihe hydrological Equipment Co
, Ltd
Hhsc-i electronic water gauge is a new generation of digital sensor
It uses the principle of weak conductivity of water to measure the water level of electrode, obtain data, and transmit it after digital coding, indexing, sampling and digital processing by CPU
The unique advantage is that the error is not affected by environmental factors and only depends on the electrode spacing
The measurement accuracy is high, stable and reliable, and easy to use
It avoids the shortcomings of zero *, temperature *, water quality and weeds of the traditional water level sensor
Signals can be transmitted through a variety of transmission modes

This product can be widely used for water level monitoring in water conservancy and hydropower projects such as rivers, lakes, reservoirs, hydropower stations, irrigation areas and water transmission
It can also be used for water level monitoring in municipal projects such as tap water, urban sewage and road ponding
It is especially suitable for occasions where the water level variation is not very large, such as hydrology, urban waterlogging, urban road ponding, irrigation channels and so on

1、 Basic principles
Hhsc-i electronic water gauge is designed for water level measurement in harsh environment with high water level accuracy requirements
The electrode type electronic water gauge is composed of five parts: electrode circuit board, acquisition CPU, electrode and shell, and water level scale plate
Highly optimized and equally divided electrode, electrode circuit board, acquisition CPU and water level scale plate are sealed in the shell; The highly optimized and equally divided electrode contact is connected with the shell circuit board and the acquisition CPU through the circuit board
Enter the low-power mode in the normal standby state and turn off the power supply of the measurement circuit module
On the one hand, it realizes ultra-low power consumption and provides convenience for the power supply of field batteries
On the other hand, it prolongs the service life
When it is necessary to measure, power on each module, and measure after detecting that the operation state of each module is normal
During the measurement of this product, the acquisition CPU starts to send out pulse control signal, and the chip in the switching circuit board generates scanning sequence
It starts to scan downward from the top of the water gauge
When the electrode with a scale equal to the water surface is triggered, it sends out stop scanning signal
The data measured by the water gauge is calculated by the calculation formula and transmitted to the external data acquisition instrument through the data lead
The water gauge is calculated to measure the distance to the person on the water surface, Then convert it into corresponding data
The upper acquisition instrument can carry out remote transmission on the display screen and RTU with microcontroller, computer terminal or voice alarm device

2、 main features
1
  The error is fixed and will not change with the expansion of the measuring range
It can ensure the accuracy of 1cm

2
  There is no zero * shift and temperature * shift

3
  Not affected by atmospheric temperature, pressure, humidity, sand content, freezing and other external factors; It is not affected by pollutants and sediments such as mud paddle, dirty liquid and corrosive liquid; The water level wave is digitally filtered to ensure the true value of the water level

4
  No mechanical moving parts, rust, jamming and other phenomena

5
  The installation is convenient, there is no need to build logging, and the system investment is small

6
  Each water gauge unit is equipped with lightning protection device to avoid accidental damage and reduce later maintenance cost

7
  There is a scale on the outside, which is convenient for measurement, comparison and manual observation
8
  Low power design, DC power supply and battery + solar panel can be used for power supply
9
  Advanced production technology is adopted
The stainless steel shell has high reliability and anti-interference performance
The interior is specially treated with high-performance sealing materials, which has the characteristics of anti-corrosion, anti freezing, heat resistance and aging resistance

10
Communication baud rate 1200 immutable
3、 Technical indicators
1、  Draft gauge specification: 40cm
2、  Draft precision Degree: 1cm (full range equal precision measurement);
3、  Water gauge supply voltage: DC9V - DC24V
4、  Draft output signal: RS485 (Modbus RTU), communication baud rate 1200, immutable
5、  Maximum sampling frequency of single-mode group: 0
35 seconds;
6、  Static current of single-mode group: & le; 20mA（DC12V）；
7、  Operating temperature ,- 20℃～60℃；
8、  Connection mode: U-shaped connector
9、  Installation method: vertical installation, inclined installation, ladder installation, etc
3、 Interface definition (definition of power and signal lines)

function definition	electronic water gauge
DC12V	Red
GND	Black
RS485  A(+)	yellow
RS485  B(-)	White (green)

IV
communication protocol
485 port communication protocol (reading part)
485 port communication protocol Mod_ HH adopts Modbus communication protocol (RTU mode)
Haihe equipment acts as a slave

Data byte format: start bit , Data bits , (no parity bits) Stop bit
1  8  one
Baud rate: 9600 (settable)
Function code 03:
Use the 03 function code of Modbus communication protocol to read the value of sensor or display (1 value)
The command format of the host is slave address, function code, starting address, number of bytes and CRC code
The command format of slave response is slave address, function code, data area and CRC code
The data in the data area is binary code, two bytes, with the high bit first
CRC codes are two bytes, with the low order first

Example of information frame format:
Host call: 01 , 03  00  00  00  01  84  0A
Station number , Function code , Start address , Read points , CRC check code
  Low , high
Slave answer:
  01  03  02  XX  XX  XX  XX
  Station number , Function code , Read unit byte , Data , CRC check code
  High (binary) low
The above 01, 03, 02, XX, etc
are all one byte
The data is two bytes, and the high-order byte comes first
There is an interval of at least 3
5 bytes between the beginning and end of each frame
When the user is programming the host, the characters of other bytes are unchanged except the station number (address) and CRC check code
The number of read points in the host format can be 01 or 02 (02 is for compatibility with some protocols)
The function code (03) and the number of read unit bytes (02) in the slave answer frame remain unchanged
The inspection content of CRC includes everything from the address to the CRC check code

5、 Upper computer setting and acquisition software
1
Unit touch group setting software (factory setting)
 
 
2
Water gauge RTU acquisition and setting
6、 Installation method
Method 1: suspension method
Fix the PVC or steel pipe on the wall and the edge of the reservoir, and hang the water gauge in the fixed pipe with bolts
This method is applicable to situations where the wall is not flat and there is possibility of man-made damage

Method 2: bolt fixation
It is directly fixed on the flat wall with stainless steel expansion bolts
This method is suitable for flat walls where there is no possibility of man-made damage

7、 Dimension drawing
  Module hole size drawing
 
  Dimension drawing of connector ,
 
8、 Construction case
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Xuzhou Haihe hydrological Equipment Co
, Ltd
, Tel: 0516-87939789
Address: Xuzhou Economic Development Zone , http://www
93322
net