Winsen ZPS20 Air Quality Detection Module User Manual

Winsen ZPS20 Air Quality Detection Module

Product Information

Specifications

• Model: ZPS20

• Detection Gas: VOC (Volatile Organic Compounds)

• Output: I2C

• Working Voltage: –

• Working Current: –

• Warm-up Time: –
  Response Time: –

• Recovery Time: –

• Detection Range: –

• VOC Index Output: 0-500 (corresponds to ethanol gas 0-5ppm)

• Operating Temperature: –

• Operating Humidity: –

• Storage Temperature: –

• Sensor Size: –

Product Usage Instructions

1. Installation
   Connect the module to the appropriate power source and ensure proper grounding.

2. Communication Setup
   Configure the communication protocol according to the I2C specifications provided in the manual.

3. Reading Measurement Data
   Use the provided commands to read VOC measurements and other relevant data from the module.

Frequently Asked Questions (FAQ)

• Q: How often should the VOC measurements be taken?
  A: It is recommended to periodically send the command to obtain VOC values with a sending interval of at least 1 second.

• Q: What should be done if the sensor performance is affected?
  A: Ensure that the working voltage is within the recommended range to prevent errors in output data.

• Q: How can the serial number of the module be obtained?
  A: Send the specific command within 3 minutes of power-on to retrieve the serial number.

Air-Quality Detection Module

Digital Type VOC Module
（Model：ZPS20）

• Version :1.2
• IssueDate: 2023.7.10
• Zhengzhou Winsen Electronics Technology Co., Ltd

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.

Digital type ZPS20 Module

Profile
Digital type ZPS20 module is a general-purpose air quality sensor module. This module is to detect VOC gas concentration, ambient temperature and humidity, adopting advanced semiconductor VOC gas sensor and MEMS temperature humidity sensor. It has the features of high sensitivity and digital output, which is convenient to use.

Features

• High sensitivity; Excellent long-term stability;
• Low power consumption; Long lifespan; I2C output;

Application
Air cleaner, fresh-air system, intelligent integrated ceiling, air quality detector, ventilation fans, and air-condition etc. air pollution detection and air purification areas.

Technical Index

Table 1

gases; cigarette smoke, carbon monoxide, ammonia, hydrogen etcs harmful and explosive gases
Output| I2C output
Working voltage| 5.0±0.1V DC
Working Current| ≤70mA
Warm-up Time| 3 min
Response Time| ≤30s
Recovery Time| ≤60s
Detection Range| 0~10mg/m3
VOC index output| 0~500
Operating Temperature| 0~50℃
Operating Humidity| 15%RH- 95％RH(no condensation)
Temperature output range| -40~85℃
Humidity output range| 0~100%RH
Storage temperature| -20~60℃
Size| 32mm24mm11mm

Note:

1. It will affect the sensor performance, if the working voltage is too high or too low.
2. VOC index output of 0~500 can correspond to ethanol gas 0~5ppm.
3. It is recommended that the device be used within the recommended operating temperature and humidity range of the module; otherwise, large errors may occur in the output data.

PIN Definition

Sensor Size

Sensor Communication

1. Communication Mode
   The ZPS20 module adopts IIC communication mode, and the IIC address is 89(0x59). All module instructions consist of two bytes (16 bit), and there are no CRC bytes after the command; The data packet returned from the sensor is transmitted as a two-byte (16-bit) measurement and a one-byte (8-bit) CRC.

2. Typical IIC communication timing between the host and VOC modules
   In the IIC bus, the sensor as a slave device supports communication rates up to 70kHz. When the host sends the start signal (low level), the sensor begins to communicate; and when the host sends the stop signal (high level), the communication ends. The start and end signals are only effective when the SCL is low, and the typical communication timing between the host and the VOC module is shown in Figure 4.
   After the module is powered on, the host periodically sends commands and reads data in the following order:

3. The host sends the measurement command.

4. The maximum waiting time or expected duration of the host is about 50ms.

5. The host reads the measurement result. If the communication fails, the host waits for 1s and sends the measurement command again.

Table 3 IIC parameter

IIC communication command

Read the VOC measurement
The host can periodically send this command to obtain the VOC value detected by the VOC module. It is recommended that the sending interval be longer than or equal to 1 second.

Table 4 IIC VOC measurement command

measurement mode

Table 5 The value returned by VOC measurement command

Read the module serial number
Within 3 minutes of power-on, the host can send this command to obtain the serial number of the VOC module as actual demand. Once communicated, the serial number can be obtained, and repeat sending is not required.

Table 6 IIC serial no. reading command

the VOC module by returning 3 x 3 bytes (2 + CRC bytes).

Table 7 The value returned by serial no. reading command

Read the temperature and humidity measurement values
The host can send this command to obtain the temperature and humidity value periodically. It is recommended that the interval for sending this command be no less than 1 second.

Table 8 IIC temperature and humidity measurement command

measurement mode. The returned data contains the temperature value first and the humidity value after.

Table 9 The value returned by T &H measurement command

• T = ( (byte1256 + byte2) / 100)℃, if (byte1256 + byte2 < 32767)
• T = ( ( (byte1256 + byte2) – 65536) / 100)℃, if (byte1256 + byte2 > 32767)

3| CRC| to verify bytes 1, 2
4, 5| Humidity value| H = ( ( byte4 * 256 + byte5 ) / 100 ) %RH
6| CRC| to verify bytes 4, 5

Note: All returned data contains the high byte first and the low byte after.

Example of IIC reading data

Checksum calculation

• The CRC algorithm generates an 8-bit CRC checksum for each digit transmitted from behind. The CRC is the result of the check of two bytes of data that were previously transmitted.
• //CRC verification type: CRC8/MAXIM
• // Polynomial: X8+X5+X4+1
• //Poly: 0011 0001 0x31
• // Data-high would be 1000 1100 0x8c after transferring.
• //C implementation code:
• U8 Calc_CRC8(U8 *message, U8 Num)
• {
• U8 i;
• U8 byte;
• U8 crc = 0xFF;
• for(byte = 0; byte < Num; byte++) {
• crc ^= (message[ byte ] ); for(i = 8; i > 0; –i)
• {
• if(crc & 0x80) crc = ( crc << 1 ) ^ 0x31; else crc = ( crc << 1 );
• }
• }
• return crc;
• }

Recommendations for Installation

It is recommended to install the module in a place that can have good contact with the ambient air, preferably in a parallel direct air flow. The direction of the air flow follows the direction shown by the green arrow in the following figure, and the direct air flow in the opposite direction and perpendicular to the sensor is prohibited. If the PCB is not placed in the air flow, it is recommended that the PCB be placed vertically and the T/H sensor be placed under the gas sensor to prevent heat convection from affecting the T/H sensor.

Cautions

• Please do not put the module in organic solvent (include silica gel and another cementing compound), painting, medicament, oils and fuels, high-concentration gas etc. Avoid alkali, alkali metal salt, and halogen pollution
• Please do not impact or vibrate the module seriously.
• Please warm up for 5~20 min before first using.
• Please do not use the module related with personal safety.
• Please do not install the module in the severe convection environment.
• Please do not put in the module in high-concentration organic gas for long time.
• Power the module strictly according to the request in manual.

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
• E-mail: sales@winsensor.com
• Website: www.winsen-sensor.com

References

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

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