MFrontier-MEMS sensor, infrared thermopile sensor, infrared pyroelectric sensor, infrared thermopile array sensor, temperature sensor, gas sensor, PM sensor, pressure sensor, infrared filter
Instruction Manual for MFrontier models including: NDIR CO2 Sensor Module, NDIR CO2, Sensor Module, Module
26 août 2024 — The working principle of an NDIR sensor for measuring concentration is to detect the infrared energy of the characteristic infrared.
1 day ago — strong stability, long lifespan, low power consumption, and supports two calibration methods: self calibration and manual calibration, with minimal data.
File Info : application/pdf, 8 Pages, 796.22KB
DocumentDocumentNDIR CO2 Sensor M odule MTP80-A MTP80-A is a dual channel carbon dioxide sensor based on t he principle of Non Spect ral Inf rared (NDIR) t echnology. It can det ect t he concent rat ion of carbon dioxide in t he air in real t ime and out put t he concent rat ion value t hrough UART, IIC, and PWM met hods. It has st rong ant i-int erf erence abilit y, high sensit ivit y, st rong st abilit y, long lif espan, low pow er consumpt ion, and support s t w o calibrat ion met hods: self calibrat ion and manual calibrat ion, w it h minimal dat a accuracy error. Suit able f or indust ries such as air monit oring, f resh air syst ems, smart homes, and in car air purif icat ion. Advant age Long term stability advantage - The stability of NDIR sensors mainly depends on the light source, and under the condition of no abnormalities in the light source, the long-term stability of NDIR is extremely excellent compared to other types of gas sensors . The w orking principle of an NDIR sensor for measuring concentration is to detect the infrared energy of the characteristic infrared absorption band of the measured gas. The signal characteristic is that w hen there is no measured gas, the signal strength is maximum, and the higher the concentration, the smaller the signal. The measured concentration can reach 10000PPM. Feat ures NDIR detection principle Short preheating time Temperature compensation and automatic calibration algorithms Applicat ions High sensitivity and precision Anti interference and strong stability Air quality monitoring equipment Fresh air system Car air purification Air purification equipment HAVC system Smart Home 1 Size Unitmm ± ± ± ± ± ± Paramet ers parameters Measure gas type measuring principle Measurement concentration range Measurement interval Measurement accuracy Response time Operating temperature range Operating humidity range Storage temperature range Size Pow er supply requirements Current consumption Life Communication interface PWM Output Alarm Output Self calibration cycle index CO2 NDIR 400ppm~5000ppmThe range can be customized to 10000ppm 2S ±(40ppm + 4% of reading )25 +250%±10%RH enviroment T90 time is 90 seconds 0-50° C 0-90% RH (non-condensing ) -20° C~60° C 32.5x20.8x11.6mmmax dimensions) 4.2V~5.5V 250mA peak current, 5mA valley current, 20mA average w orking current 10+ years Uart /IIC Period1004msPulse2ms~1002ms0~5000ppm Output 1 w ith concentration>1000ppm, output 0 w ith concentration<800ppm, pin in open drain output mode, unable to draw current The default self calibration cycle is 7 days 2 Pin diagram Pin Def init ion Pin number Pin name Pin Function Description 1 VIN Positive end of pow er supply 2 GND Pow er supply negative terminal Alarm function, pin in open drain output mode. When the measured concentration is greater than 1000ppm, the output of this pin is 3 Alarm- OC high. When the concentration is less than 800ppm, the output of this pin is low Pin electrical characteristics Equipped w ith anti reverse connection protection and input voltage range4.2V-5.5V The pin is in open drain output mode, and an external pull-up resistor is required for use. 4 PWM PWM function, used to output CO2 concentration. The pin is in push-pull output mode, and the output PWM cycle is 1004ms. The internal LDO output of the sensor is usually 3V ± 2%. 5 VCC-Out Generally used for serial communication level conversion. Output voltage: 3.3V ± 2%, maximum w ithout overcurrent protection Output current: 6mA The usual communication level is 3.3V. When Host-TX The TX pin of the UART in the main system is usually the TX used for IIC function, the pin configuration is 6 open drain mode, and an external pull-up /IIC-SDA of the customer MCU or the SDA of the IIC function. resistor is required for use. The usual communication level is 3.3V. When Host-RX The RX pin of the UART in the main system is usually the RX of used for IIC function, the pin configuration is 7 open drain mode, and an external pull-up resistor /IIC-SCL the customer MCU or the SCL of the IIC function. is required for use. This pin has tw o functions: 1. As an RS485 directional control pin. This pin is in open drain output mode and can be directly connected to the direction enable pin of the RS485 chip, requiring an external pull-up resistor. At this time, modules Pin6 and Pin7 are UART functions. When the pin is pow ered on, it is in pull- 2. UART/IIC function selection pin. This pin is grounded before pow er on (grounding up input mode and can be suspended or after pow er on is invalid), and Pin6 and Pin7 of the module are IIC functions. When grounded. As an RS485 direction enable 8 R/T the pin is pow ered on, it is in pull-up input mode and can be suspended or grounded pin, it is in open drain output mode and . As an RS485 direction enable pin, it is in open drain output mode and requires an requires an external pull-up resistor. external pull-up resistor. 9 bCAL-in Manual calibration of control pins 3 When the pin is pow ered on, it is in input mode w ith pull-up resistance Calibrat ion f unct ion The MTP80 module is a precision optical module. After leaving the factory, due to various reasons such as transportation, installation, w elding, etc., the measurement of the module may experience certain drift, resulting in a decrease in accuracy. The module is equipped w ith a set of self calibration algorithms that can periodically and automatically correct measurement errors, ensuring that the module maintains good measurement accuracy. The default self calibration cycle of the module is 7 days (168 hours), w hich can be adjusted by command (24 hours to 720 hours). To ensure the measurement accuracy of the calibrated sensor, please ensure that the concentration of CO2 in its w orking environment can approach outdoor atmospheric levels for at least a few hours w ithin 7 days of pow er on. Alarm f unct ion The MTP80 module supports alarm output function and outputs through the Alarm OC pin. When the measured CO2 concentration value is greater than 1000ppm, the Alarm OC pin outputs a high level. When the measured CO2 concentration value is less than 800PPM, the Alarm OC pin outputs a low level. Note that the Alarm OC pin is configured in open drain output mode and requires an external pull-up resistor to be used. If an error occurs in the module, the Alarm OC pin w ill remain high. The reference usage method is show n in the figure on the right. MTP60-A Customer circuit Communicat ion prot ocol serial communicat ion The baud rate for serial communication is 9600bps, and the serial communication packet is defined as follow s: 1. Protocol format Frame format description: Field Frame header Instruction byte Command Bytes Data length data Checksum length 2 1 2 2 n 2 explain Fixed t o 0x42,0x4D Command def init ion or sensor t ype def init ion Specif ic command w ords Big end Big end The sum of all byt es f rom t he f rame header t o t he last byt e of t he dat a 4 The follow ing protocol description applies to the gas sensor series, w ith instruction byte 0xA0. Command Byte Description Command w ord explain 0x0001 0x0002 0x0003 0x0004 0x0005 0x0006 0x0007 0x0008 0x0009 Set air pressure parameters (internal default air pressure is 1013.0hPa) Read the current set air pressure value Reading gas concentration values Single point correction function (w ith reference concentration) Single point correction reading status Prohibit or enable self calibration Read self calibration status Read self calibration cycle (hours) Set self calibration cycle (hours) 2. Basic Control Protocol Function Name Frame header Setting air MCU sends pressure 0x42 0x4d parameters Module returns 0x42 0x4d Instruction byte 0xA0 0xA0 Command Data length Bytes 0x0001 0x00 0x02 Data Checksum The atmospheric pressure value range is 700--1100 (16-bit integer) Checksum 0x0001 0x00 0x00 Checksum Read the current air pressure value MCU sends 0x42 0x4d Module returns 0x42 0x4d Read the current concentrati on value 0x42 0x4d MCU sends Module returns 0x42 0x4d 0xA0 0xA0 0xA0 0xA0 0x0002 0x00 0x00 0x0002 0x00 0x02 0x0003 0x00 0x00 Atmospheric pressure value (16-bit integer) Checksum Checksum Checksum 0x0003 Gas concentration value (32-bit integer) and data validity flag (8-bit) 0x00 0x05 0x00: valid; 0xFF: data unavailable; Checksum Single point MCU sends correction 0x42 0x4d function (w ith Module returns reference 0x42 0x4d concentration) 0xA0 0xA0 0x0004 0x00 0x04 0x0004 0x00 0x01 The reference concentration range is 400~5000 (32-bit integer) Checksum 0x01: indicates calibration start; 0xf: indicates calibration error Checksum Read single point correction status MCU sends 0x42 0x4d Module returns 0x42 0x4d Enable or disable selfcalibration MCU sends 0x42 0x4d Module returns 0x42 0x4d Read selfcalibration status 0x42 0x4d MCU sends Module returns 0x42 0x4d Read Selfcalibration cycle Setting the self- calibration period 0x42 0x4d MCU sends Module returns 0x42 0x4d MCU sends 0x42 0x4d Module returns 0x42 0x4d 0xA0 0xA0 0xA0 0xA0 0xA0 0xA0 0xA0 0xA0 0xA0 0xA0 0x0005 0x00 0x00 0x0005 0x00 0x01 0x0006 0x00 0x01 0x0006 0x00 0x00 0x00: indicates calibration completed; 0x01: indicates calibration still in progress Checksum Checksum 0x00: enables self-calibration; 0xf: disables self-calibration Checksum Checksum 0x0007 0x00 0x00 0x0007 0x00 0x01 0x0008 0x00 0x00 0x00: Enable self-calibration 0xf: Disable selfcalibration Checksum Checksum Checksum 0x0008 0x0009 0x0009 0x00 0x02 Self-calibration cycle range: 24--720h 0x00 0x02 Self-calibration cycle range: 24--720h 0x00 0x01 00: Correct operation; 01: The input data is less than 24 hours and w ill not be accepted; 02: The input data is greater than 720 hours and w ill not be accepted Checksum Checksum Checksum 5 3. Applicat ion Examples Set air pressure parameters Send0x42 0x4D 0xA0 0x00 0x01 0x00 0x02 0x03 0xF5 0x02 0x2A 0x03F5 is the hexadecimal value of 1013; Read the current air pressure Send0x42 0x4D 0xA0 0x00 0x02 0x00 0x00 0x01 0x31 Read gas concentration value Send0x42 0x4D 0xA0 0x00 0x03 0x00 0x00 0x01 0x32 The data valid bit is 0xf, the data is not available IIC inst ruct ion analysis The module w orks in IIC slave mode and can be connected to an external MCU. The module contains a pull-up resistor. The module device slave address is: 0x32 (7-bit address) The module w rite operation address is: 0x64 The module read operation address is: 0x65 Host sending sequence: 1. Send start signal 2. Send address w rite (slave address + R/W = 0x64) and check response 3. Send read command (0x03) and check response 4. Send stop signal 5. Send start signal 6. Send address read (slave address + R/W (1) = 0x65) and check response 7. Read 3 bytes from the module and send response 8. Send stop signal The received 3 bytes data are described as follow s: CO2 concentration Concentration high byte Concentration low byte Note: CO2 concentration = high byte of CO2 concentration * 256 + low concentration byte Data valid byte, 0x00 means valid data, 0xf means invalid data Data valid bytes 0x00/0xFF 6 PWM f unct ion det ailed explanat ion The PWM cycle is 1004ms The high level output is 2ms in the starting stage The middle cycle is 1000ms The low level output is 2ms in the ending stage The calculation formula for obtaining the current CO2 concentration value through PWM is: Cppm = 5000*(TH-2ms)/(TH+TL-4ms) Cppm is the calculated CO2 concentration value, in ppm TH is the time w hen the output is high level in an output cycle TL is the time w hen the output is low level in an output cycle Reliabilit y Test Test items Experimental conditions Acceptance conditions Number of verifications n Number of failures c High temperature storage 60±2, store w ithout pow er on for 48h After 2 hours of recovery in normal temperature environment, the sensor accuracy meets the specification standard Low temperature -20±2, store w ithout pow er on for 48h storage After 2 hours of recovery in normal temperature environment, the sensor accuracy meets the specification standard High temperature and high humidity storage 40 ±285%RH±5%RH48h storage w ithout pow er supply After 2 hours of recovery in normal temperature environment, the sensor accuracy meets the specification standard High temperature operation Low temperature At 50±2, the product will run for 48 hours with power on At 0±2, the product will run for 48 hours with power on After 2 hours of recovery in normal temperature environment, the sensor accuracy meets the specification standard After 2 hours of recovery in normal temperature environment, the sensor operation accuracy meets the specification standard High and low After keeping at - 20 for 60 minutes, sw itch to 60 w ithin 10s and keep for another After 2 hours of recovery in normal 60 minutes as one cycle, a total of 10 cycles, the sample is not pow ered on temperature environment, the sensor temperature shock during the test accuracy meets the specification standard Simulating transport vibration Six-sided vibration, 30 minutes per side, vibration frequency 240rpm After 2 hours of recovery in normal temperature environment, the sensor accuracy meets the specification standard Package falling Drop height: set according to the weight-to-height ratio specified in GB/T4857.18. Test according to GB/T4857.5 drop test method for packaging and transport packages. The drop test sequence is one corner, three edges and six faces (if the customer has special requirements, it can be done according to the customer's requirements). After the package drop test, the sensor appearance should not be obviously defective , no components should fall off, the sensor should be able to w ork normally, and the sensor accuracy should meet the specifications. n=8 c=0 n=8 c=0 n=8 c=0 n=8 c=0 n=8 c=0 n=8 c=0 n=8 c=0 n=1 box c=0 7 Revision Hist ory Date 2022.6.2 Version 1.0 Initial version change Shenzhen MFrontier Electronics Co.,Ltd. Webwww.memsf.com Tel 0755-21386871 Add3&5 Floor B2 Building, Zhaoshangju Technology Park, Guangming District, 518107, Shenzhen, China