Winsen ZE07-CH2O User manual

Electrochemical CH2O Detection Module
（Model：ZE07-CH2O）
User’s Manual
Version: 1.8
Valid from: 2014-11-10
Zhengzhou Winsen Electronics Technology Co., Ltd
ISO9001 certificated company

Statement
This manual’s 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.
Zhengzhou Winsen Electronics Technology CO., LTD.

Zhengzhou Winsen Electronics Technology Co., Ltd www.winsentech.com
Tel: [phone] Fax: [phone] Email: [e-mail]
Leading gas sensing solutions supplier in China
Electrochemical CH2O Detection Module ZE07-CH2O
Product Description:
ZE07-CH2O is a general-purpose and miniaturization electrochemical Formaldehyde detection module. It utilizes
electrochemical principle to detect CH2O in air which makes the module with high selectivity and stability. It is a
combination of mature electrochemical detection principle and sophisticated circuit design.
Features:
*High sensitivity & resolution& Good stability
*Extremely low power consumption
*UART/Analog Voltage/PWM wave output
* Excellent ability of Anti-interference
*Temperature compensation
*Excellent Linear output
Parameters:
Structural drawing
Model No.
ZE07-CH2O
Target Gas
CH2O
Interference
Gas
Alcohol, CO &etc.
Output Data
DAC(0.4～2V standard voltage
output)
UART Output（3V Electrical Level）
Working
Voltage
3.7V～9V（No voltage reverse
connect protection ）
Warm up time
≤3 minutes
Response
time
≤60s
Resume time
≤60s
Detection
Range
0～5ppm
Resolution
0.01ppm
Operating
Temp.
0℃～50℃
Operating
Hum.
15%RH-90％RH (No condensation)
Storage temp.
0℃～50℃
Working life
2 years（in air）

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Pin Description: Table 2
PIN15
Vin (Voltage input 3.7V-9V)
PIN5、PIN14
GND
PIN1
VOUT(Voltage output 3.0V)
PIN3
Reserved
PIN4
Reserved
PIN7
UART (RXD) 0~3.0V Data input
PIN8
UART(TXD) 0~3.0V Data output
PIN9
Sensor Analog signal
PIN10
DAC 0.4V-2V
(0-full measuring range)
PIN2/PIN6/PIN11/PIN12/PIN13
NC
Picture 2：Pin figure of the Module
Communication Protocol:
1 General Settings
Table 3
Baud Rate
9600
Data Bits
8 bytes
Stop Bits
1 byte
check bits
Null
2 Commands
There are two communication type: active upload type and Q&A type. The default type for this module
is active upload and it sends gas concentration every other one second. Commands as follow:
Table 4
0
1
2
3
4
5
6
7
8
Start
Byte
Gas type
Unit
No decimal
byte
Concentration
(High Byte)
Concentration
(Low Byte)
Full Range
(High Byte)
Full Range
(Low Byte)
Checksum
0XFF
CH2O
=0X17
Ppb=0x04
0x00
0x00
0x25
0x13
0x88
0x25
Gas concentration value= Concentration High Byte *256+ Concentration Low Byte
Switch to Q&A type, commends as follow:
Table 5
0
1
2
3
4
5
6
7
8
Start
Byte
reserved
Switch
command
Q&A
reserved
reserved
reserved
reserved
checksum
0xFF
0x01
0x78
0x41
0x00
0x00
0x00
0x00
0x46

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Switch to active upload type, commends as follow:
Table 6
0
1
2
3
4
5
6
7
8
Start
Byte
reserved
Switch
command
Active
upload
reserved
reserved
reserved
reserved
checksum
0xFF
0x01
0x78
0x40
0x00
0x00
0x00
0x00
0x47
To read the concentration value, commends as follow:
Table 7
0
1
2
3
4
5
6
7
8
Start
Byte
reserved
command
reserved
reserved
reserved
reserved
reserved
checksum
0xFF
0x01
0x86
0x00
0x00
0x00
0x00
0x00
0x79
To return, commends as follow:
Table 8
0
1
2
3
4
5
6
7
8
Start
Byte
command
Concentration
High
byte(ug/m3)
Concentration
Low byte
(ug/m3)
reserv
ed
reserv
ed
Concentration
High byte
(ppb)
Concentration
High byte
(ppb)
Check
sum
0xFF
0x86
0x00
0x2A
0x00
0x00
0x00
0x20
0x30
3 Checksum and calculation
**********************************************************************
* Function Name: ucharFucCheckSum(uchar *i,ucharln)
* Functional description: Sum check【Take Not(Byte1+Byte2+…Byte7) +1】
**********************************************************************/
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;
return(tempq);
}

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Cross interference gas: Table 5
Gas
Concentration
Concentration output
NH3
50ppm
0ppm
C6H6
100ppm
0.1ppm
Cl2
10ppm
0.1ppm
CH3L
5ppm
0.1ppm
C3H6O
100ppm
0.2ppm
C2H4O
10ppm
0.5ppm
SO2
20ppm
0.8ppm
H2S
100ppm
3.7ppm
H2
450ppm
5ppm
C2H5OH
131ppm
5ppm
CH3OH
42ppm
5ppm
CH2O
5ppm
5ppm
Cautions:
1. Sensor shall Avoid organic solvent, coatings, medicine, oil and high concentration gases
2. Excessive impact or vibration should be avoided；
3. Please keep the modules warming up for at least 5 minutes when first using.
4. Please do not use the modules in systems which related to human being’s safety.
5. Please do not use the modules in strong air convection environment.
6. Please do not expose the modules in high concentration organic gas for a long time.
7. Sensor can’t be pulled out.
8. The component can’t be removed or replaced.
Note: To keep continual product development, we reserve the right to change design
features without prior notice.
Zhengzhou Winsen Electronics Technology Co., Ltd
Add: No.299, Jinsuo Road, National Hi-Tech Zone,
Zhengzhou 450001 China
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Website: www.winsentech.com