Winsen Ze40a-tvoc Electrochemical Tvoc Detection Module User Manual

Winsen ZE40A-TVOC Electrochemical TVOC Detection Module User Manual

Statement

This manual copyright belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without thewritten permission, any part of this manual shall not be copied, translated, stored in databaseorretrieval 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 thefaultscaused by misuse, please read the manual carefully and operate it correctly in accordancewiththeinstructions. If users disobey the terms or remove, disassemble, change the components insideofthe 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 reservetheright to improve the products without notice. Please confirm it is the valid version beforeusingthismanual. 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 usageinthefuture.

Electrochemical TVOC Detection Module ZE40B-TVOC

Profile

The ZE40B-TVOC electrochemical alcohol module is a general-purpose, miniaturized module. The electrochemical principle is used to detect the presence of TVOC in the air, which has good selectivity and stability. Builtin temperature sensor for temperature compensation; digital output and analog voltage output for easy use. ZE40A-TVOC is a universal gas module designed and manufactured by combining proven electrochemical detection technology with sophisticated circuit design. Features
High sensitivity, high resolution, low power consumption, long lifespan UART and analog voltage output
Good stability and excellent anti-interference, temperature compensation, good linearity.

Main Application

Portable meters, air quality monitoring equipment, air purifiers, fresh air ventilation systems, air conditioners, smart home equipment and other places.

Technical Parameters

table1.

Fig1. Structure(tolerance ±0.2mm)

Pin Description

table2.

Fig2. Pins construction

Communication Protocol

General Settings

Table 3

Communication Commands

There are two kinds of communication mode: initiative upload mode and question & answer (Q&A) mode. We take initiative upload mode as the default settings.and it sends gas concentration every other one second.
If users want to switch back to initiative upload mode under Q&A mode, send the following command:Table4

(Q &A mode to initiative upload mode)

The module sends the gas concentration value every 1s under initiative upload mode: Table 5

Gas concentration value ppb = High Byte*256+Low Byte, mg/m3=(ug/m3)/1000

Please note that in the above calculation formula, the byte4 and byte5 means the decimalismvalue changedfrom hexadecimal.

Switch to the question & answer (Q&A) mode, please send the following command to close the initiativeuploadmode first :  Table 6

(command to close initiative upload mode )

To read concentration in Q&A mode, the command line format is as follows: Table 7

Return the concentration as follow: Table 8

Gas concentration value = High Byte*256+Low Byte

Please note that in the above calculation formula, the High byte and Low byte means the decimalismvaluechanged from hexadecimal.

Checksum and calculation

unsigned char FucCheckSum(unsigned char *i,unsigned char ln)
{
unsigned char j,tempq=0;
i+=1;
for(j=0;j<(ln-2);j++)
{
tempq+=*i;
i++;
}
tempq=(~tempq)+1;

Cross interference gas

Cautions

1. The module avoids contact with organic solvents (including silica gel and other adhesives), paints, chemicals, oils and high-concentration gases.
2. The module can not be completely encapsulated with resin material, nor can it be immersed in an oxygen-freeenvironment, otherwise it will damage the performance of the sensor;
3. The module can not be used for long time in the environment containing corrosive gases, corrosive gases will damage the sensor;
4. The module cannot withstand excessive impact or vibration.
5. The module needs to be preheated for 24-48 hours when it is first powered on, so that the module canbefullystabilized and then tested normally.
6. Do not apply the module to systems that involve personal safety.
7. Do not install the module in a strong convection air environment.
8. Do not place the module in a high concentration of organic gas for a long time. If it is placed for a long time, thesensor zero point will drift and the recovery will be slow.
9. It is forbidden to use hot melt adhesive or sealant package module with curing temperature higher than80°C;
10. It is forbidden to store and use in high concentration alkaline gas for a long time.

Customer Support

Zhengzhou Winsen Electronics Technology Co., Ltd
Add: No.299, Jinsuo Road, National Hi-Tech
Zone,Zhengzhou 450001 China
Tel: +86-371-67169097/67169670
Fax: +86-371-60932988
Tel: 86-371-67169097/67169670 Fax: 86-371-60932988
Email: [email protected]

References

• Winsen Gas Sensor_CO2 Sensor_Air Quality Sensor_Dust Sensor_CO Sensor-Winsen Electronics