Product Name: Online Outdoor Air Quality Monitoring Device Item No.: OPM-6303M Date: September 12th, 2023

Online Outdoor Air Quality Monitoring DeviceOPM-6303M Applications ■ Outdoor Air Quality Monitoring ■ City Raised Dust Monitoring ■ Mining Field Dust Monitoring OPM-6303M online outdoor air quality monitoring device adopts a pump-suction sampling method and has a solid and reliable metal structure with a new intelligent auto particle identification (API) technology which enable the measurement to be accurate in different dust source scenarios. It can accurately and stably output PM1.0, PM2.5, PM10, TSP mass concentration. At the same time, it has a built-in pretreatment device and a flow monitoring...

® Wuhan Station traceability system as benchmark. If there is measurement discrepancy in other regions, coefficient correction is needed based on the local dust particle distribution. Note: www.gassensor.com.cn

OPM-6303M Structure (Unit: mm; Tolerance: ±2 mm) Power ground input

Product Installation Please make sure that the sensor module’s air inlet is not blocked during installation and operation. To avoid the dust deposits on the surface of the sensitive sensor device which may impact the measurement accuracy, its recommended to install the sensor module in the following way.

Communication Protocol General Statement 1) The data in this protocol are all hexadecimal data. For example, “46” for decimal [70]. 2) [xx] is for single-byte data (unsigned, 0-255); for double data, high byte is in front of low byte. 3) Baud rate: 9600; Data Bits: 8; Stop Bits: 1; Parity: No Format of Serial Communication Protocol The equipment adopts MODBUS RTU communication protocol, and the requirements are as follows: 1. Equipment as slave. 2. MODBUS 03 function code (read holding registers) can be used to read device status and data; MODBUS 06 function code (preset single register) can...

Communication ProtocolRegister Address Table: Restrictions: 1. Read-only register and read-write register are not allowed to overlap; 2. Only the function of writing single register is realized, and writing multiple registers is not supported; 3. The total number of registers is limited. At present, it supports 32 input registers and 32 holding registers; 4. The current version does not support file transfer with large amount of data; 5. See Table 1 and table 2 for register details. All registers are 16-bit words, and the register address is register serial number-1. Table 2: Input registers_

Table 3: Holding Register Function code description The function code of OPM-6303M is as follow: 03: read holding register 04: read input register 06: write single register Application conditions: (1) Assume it is a single sensor. (2) All data are hexadecimal data, DFX must be converted to decimal when calculating data. (3) Symbol description: www.gassensor.com.cn

Communication Protocol IP is the device address. CRC16 is a two-byte check of MODBUS CRC16, high byte is in front of low byte. CS is 0-ADD8 sum check, the minimum byte of result for head +sending data + CS is 0x00. DF1 DF2 DF3 DF4 … DFN represent uncertain data. 1 Read PM1.0, PM2.5, PM10, TSP measurement value Read PM1.0 measurement value: Send: IP 04 00 07 00 02 CRC16 Respond: IP 04 04 DF1 DF2 DF3 DF4 CRC16 PM1.0 measurement value: DF1*256^3+ DF2*256^2+ DF3*256+DF4 (μg/m³) Read PM2.5 measurement value: Send: IP 04 00 09 00 02 CRC16 Respond: IP 04 04 DF1 DF2 DF3 DF4 CRC16 PM2.5 measurement value:...

Communication Protocol Real time gas flow value: (DF41*256+DF42)/100(L/min） 4 Read PM1.0, PM2.5, PM10, TSP measurement value user calibration coefficient Read PM1.0 user calibration coefficient: Send: IP 03 00 08 00 01 CRC16 Respond: IP 03 02 DF1 DF2 CRC16 PM1.0 user calibration coefficient： (DF1*256+DF2)/10000 Read PM2.5 user calibration coefficient: Send: IP 03 00 09 00 01 CRC16 Respond: IP 03 02 DF1 DF2 CRC16 PM2.5 user calibration coefficient： (DF1*256+DF2)/10000 Read PM10 user calibration coefficient: Send: IP 03 00 0B 00 01 CRC16 Respond: IP 03 02 DF1 DF2 CRC16 PM10 user calibration coefficient：...

Communication Protocol 8 Read reading holding register data continuously Device address: DF2 PM1.0 user calibration coefficient: (DF13*256+DF14)/10000 PM2.5 user calibration coefficient: (DF15*256+DF16)/10000 PM10 user calibration coefficient: (DF19*256+DF20)/10000 TSP user calibration coefficient: (DF11*256+DF12)/10000 Device stop running time, running time: DF23*256+DF24(min) The setting flow of the control device：(DF25*256+DF26)/100 (L/min) Send: IP 03 00 02 00 0A CRC16 Respond: IP 03 14 DF1~DF26 CRC16 9 Modify PM1.0, PM2.5, PM10, TSP measurement value user calibration coefficient (The coefficient...

Communication Protocol 11 Modify device stop running time (The time range that can be set is 0 – 10000) Modify device stop running time: stop running time is DF1*256+DF2 min Send: IP 06 00 0D DF1 DF2 CRC16 Respond: IP 06 00 0D DF1 DF2 CRC16 12 Modify the setting flow of the control device (The flow range that can be set is 0.8L/min – 1.2L/min) Modify the setting flow of the control device: the setting flow is (DF1*256+DF2)/100L/min Send: IP 06 00 0E DF1 DF2 CRC16 Respond: IP 06 00 0E DF1 DF2 CRC16 13 Confirm device address Confirm device address in running mode: device address is DF1 Send: 11...

User Attention ※ It is forbidden to use the product in the environment with high concentration dust, containing water vapor, oil and corrosive substances, and in the high temperature environment exceeding the working temperature. ※ Do not block the air inlet and outlet, so as not to damage the air pump. ※ When use the product, it is recommended to add a 50-60 mesh protective filter to the sensor's air inlet to prevent flocs, hair, etc. from affecting the sensor's detection. ※ This product is an integral unit. Users should not disassemble it to avoid irreversible damage. ※ In order to not to affect...