Winsen ZW03 pH Water Quality Detection Module
Statement
This manual copyright belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without the written permission, any part of this manual shall not be copied, translated, stored in database or retrieval system, also can’t spread through electronic, copying, record ways.
Thanks for purchasing our product. In order to let customers use it better and reduce the faults caused by misuse, please read the manual carefully and operate it correctly in accordance with the instructions. If users disobey the terms or remove, disassemble, change the components inside of the sensor, we shall not be responsible for the loss.
The specific such as color, appearance, sizes &etc, please in kind prevail.
We are devoting ourselves to products development and technical innovation, so we reserve the right to improve the products without notice. Please confirm it is the valid version before using this manual. At the same time, users’ comments on optimized using way are welcome.
Please keep the manual properly, in order to get help if you have questions during the usage in the future.
Profile
The ZW03 pH water quality detection module is a universal module that uses electrochemical principles to detect the H + content in water, with good selectivity and stability.Using the digital signal output, very easy to use.ZW03 is designed and manufactured with mature electrochemical detection technology closely combined with sophisticated circuit design.
Sensor characteristics
Fig1. Sensor image Fig1.Structure
Low power consumption,high accuracy,linear output, easy calibration and excellent stability.
Main application
It is widely used for water quality pH detection in laboratory research, water plant water supply, waste-water treatment, aquaculture, farmland irrigation and other fields.
Technical indicators
| Items | Parameter |
| Working voltage | 12V(DC) |
| Consumption | <25mW |
| Temperature range | 0-50℃ |
| Output mode | RS485（5V） |
| Output linearity | Linear |
| Response time | ≤180S |
| Detection Temperature range | 0-50℃ |
| Items | Parameter |
| Measure range | 0-14 |
| Resolution ratio | 0.02pH |
| Size | 40×25mm |
| Response time | ≤180 s |
| Output linearity | Linear |
| Service life | 3year |
| Working current | <5mA |
Note: The tolerance range is ± 0.25mm
Fig1. Sensor Structure
Stable 2. Pin definition
| PIN1 | VCC |
| PIN2 | GND |
| PIN3 | A |
| PIN4 | B |
| PIN5 | GND |
| PIN6 | RXD（3V TTL level） |
| PIN7 | TXD（3V TTL level) |
| PIN8 | +5V |
| PIN9(BNC) | Sensor negative pole |
| PIN10(BNC) | Sensor positive pole |
Sensor linearity
The sensor be placed in standard pH buffer: pH4.01, pH 6.86 and pH 9.18 to record the output of the module as shown in the figure below.
Communication Protocol
General settings
| Baud rate | 9600 |
| Data byte | 8 |
| Stop byte | 1 |
| Check | Null |
General command
Host-computer software send format
| Type | Instructions | Note | |
| Integer | 16 byte | Indicates that high and low bytes are not reversed | For example :0x 0032 turn into the decimal number is 50 |
| Floating point number | ABCD | Represents analyze in order | For example：41 DB 72 37Z turn into a floating
point number is 27.4 |
Read the current concentration value sending format：
| Module address |
FC | start address | Number of registers | CRC16 | ||||
| High byte | Low byte | High byte | Low byte | Low byte | High byte | |||
| Device 1 | 0X01 | 0X03 | 0X00 | 0X01 | 0X00 | 0X02 | 0X95 | 0XCB |
| Device 2 | 0X02 | 0X03 | 0X00 | 0X01 | 0X00 | 0X02 | 0X95 | 0XF8 |
Write the device address sending format：
| Device ID address | FC | Register initial address | Write Equipment address (The HEX integer) | CRC16 | ||||
| High byte | Low byte | High byte | Low byte | Low byte | High byte | |||
| Device 1 | 0XFE | 0X06 | 0X00 | 0X19 | 0X00 | 0X01 | 0X8D | 0XC2 |
| Device 2 | 0XFE | 0X06 | 0X00 | 0X19 | 0X00 | 0X02 | 0XCD | 0XC3 |
The calibration of the sensor：
| Device ID address | FC | Register address | Write zero point concentration value (The HEX integer) | CRC16 | ||||
| High byte | Low byte | High byte | Low byte | Low byte | High byte | |||
| pH4.01 | 0X01 | 0X03 | 0X00 | 0X66 | 0X01 | 0X91 | 0X65 | 0XE9 |
| pH6.86 | 0X01 | 0X03 | 0X00 | 0X66 | 0X02 | 0XAE | 0X25 | 0X09 |
| pH9.18 | 0X01 | 0X03 | 0X00 | 0X66 | 0X03 | 0X96 | 0X25 | 0X4B |
/******************************************************************************* Name：crc16 verification
Function：crc16 verification
Enter：(byte pointer )*ptr，(data lenth) len
Return：(double byte) crc ********************************************************************************/uint16_t getCRC16_485(volatile unsigned char* ptr, unsigned char len)
{
unsigned char i; uint16_t crc = 0xFFFF; while (len–)
{
crc ^= *ptr;
for (i = 0; i < 8; i++){
if (crc & 1)
{
crc >>= 1;
crc ^= 0xA001;
}
else
{
crc >>= 1;
}
}
ptr++;
}
return(crc);
}
Precautions
- The module shall avoid contact with organic solvents, coatings, agents and oils.
- Do not apply the module to systems involving personal safety
- Do not install the module in a strong air convection environment.
- The module shall not withstand excessive impact or vibration, and can not shake during use, otherwise the value returned will be inaccurate.
- Please supply the module in strict accordance with the power supply voltage of the module. The voltage exceeding 12V will lead to irreversible damage to the module.
- Do not place the module in a strong air convection environment.
- Do not place the module in a high concentration of organic gas for a long time.
Tel: 86-371-67169097/67169670
Fax: 86-371-60932988
Email: [email protected]
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