Doppler Sensor Specification

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Product introduction

The product principle

In the field of acoustics,when there is relative motion between the sound source and the receiver(ie,the probe and the reflector),the frequency of the echo will change.This change in frequency is called the frequency shift,the Doppler effect.The frequency of the sound becomes higher as it moves toward the observer and becomes lower as it moves away from the observer.The Doppler flow meter calculates the flow rate by calculating the frequency change.

Technical parameters

product appearance structure

(This is the rendering,the sensor structure is subject to the actual object)
Technical parameters Power supply:DC10-15V
Working current:about 10mA standby,measuring 100mA Sound wave frequency:2MHZ
Blind area:10 cm
Flow rate range:0.02-10 m/s Water depth range:0.02-10 meters Temperature:0-50°Measurement period:20 seconds
Sensor material:ABS,stainless steel
Output interface:RS485
Working water depth:0.2 meters-10 meters

The installation instructions

Normal installation is guaranteed to be 20CM below the minimum water level to avoid exposure to water
Sensor installation instructions:

Wiring instructions:

Sensor red line	power supply DC12V+
Sensor black line	power supply DC12V-
Sensor blue line	RS485A
Sensor yellow line	RS485B

The communication instructions

Default:9600,n,8,1(baud rate 9600bps,no parity,8 data bits,1 stop bit)
Write the address to the sensor
Write ADR Address Command:EB90FF00000000XX Explanation:XX is a hexadecimal address code
After writing,judge 20 seconds,re-power on
After writing,you can read the verification address:Read ADR Address Command:EB90FF0000000000
Reading measured values

Register	Number of registers	Variable name	type of data	unit
0001-0002	2	Water depth	REAL 4	m
0011-0012	2	temperature	REAL 4	℃
0013-0014	2	Flow rate	REAL 4	m/s

Read depth command: ADR0300000002 [16-bit CRC] Example: 01 03 00 00 00 02 C4 0B
Code: 01 03 04 3C 3F B1 5B F3 C4
Depth data 3C 3F B1 5B Data type REAL 4 Convert decimal: 0.0116 meters

Reading temperature ADR03000A0002[16-bit CRC] Example: 01 03 00 0A 00 02 E4 09

Code: 01 03 04 41 12 00 00 4E 0A
Temperature data: 41 12 00 00 Data type REAL 4
Convert decimal: 9.125°

Read flow rate ADR03000C0002[16-bit CRC] Example: 01 03 00 0C 00 02 04 08
Code: 01 03 04 3D 5E 31 0B C2 1A
Flow rate data: 3D 5E 31 0B data type REAL 4 Convert decimal: 0.054246

Read all registers ADR030000000E[16-bit CRC] Example 01 03 00 00 00 0E C4 0E
Code: 01 03 1C 3C 3F B1 5B 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 41 12 00 00 3D 5E 31 0B 44 58
Liquid level correction Level output value Y=AX+B
Y=output level, A level calibration coefficient, X correction value, B offset constant
Sensor assignment statement: SetPressureParameter(A,B)
For example, reading the sensor number data multiple times and making a table.

Serial number	Data read value X	Actual water level Y	Error conclusion
1	0.1 meters	0.113	Y=1.1*X+0.003
2	0.5 meters	0.553
3	2.0 meters	0.223

We combined the analysis table to give the sensor a correction value A=1.1 B=0.003
Serial port send write assignment statement:SetPressureParameter(1.1,0.003)
This way the sensor reads and the actual value is always

Note

1.The sensor needs to avoid silt and avoid collisions with objects such as stones.Where there are many plants,it is necessary to install a grille to avoid water and grass entanglement.
2.The sensor installation direction,the sensor launch surface needs to be installed in the direction of flow.
3,the sensor has a sound wave blind zone,try to ensure that the sensor is under water 20 cm(the sensor is half exposed to the water,or blocked by the sludge may have false data,the probability is very low,usually the data will appear large number,such as 2 m/sec or
more It is recommended that the secondary developer of the sensor can shield the large flow rate value by the water level,or the water flow rate in the actual application can be directly shielded from the flow rate greater than 2 meters.
4,cable snorkel is not difficult to break,affecting water level measurement.
5,try to do a good job in signal and power lightning protection.
6.If the sensor cable is long,you need to add 485 relay.The power supply avoids the interference of the inverter.