The LT-M9500 is air temperature and humidity, infrared CO2, and TVOC sensors are internally configured with MEMS specialized modules for measuring air temperature and humidity. 

They can also accurately measure CO2 sensor data using the NDIR principle. The TVOC uses an imported semiconductor measuring probe, which can measure gas concentrations above 0.01PPM. 

It has higher sensitivity, especially for volatile gases such as formaldehyde, benzene, and toluene, which have a greater impact on human health, and can be used for qualitative measurement of air quality.

Using LoRaWAN wireless communication technology that is compatible with the standard LoRaWAN protocol,it provides flexible and convenient networking, and can be widely used in the field of atmospheric environmental monitoring in the Internet of Things, such as intelligent breeding, smart homes, factories, and shopping malls.

Using 1 section 2# lithium battery powered, with sleep wake up function, long battery life, no wiring, construction convenient.Import CO2 low power probe, unique NDIR dual channel measurement technology immune to outside interference, accurate measurement, long battery life.

Features:

Air temperature and humidity parameters:

Air temperature measurement range: -40~80 degrees 

Air temperature measurement accuracy: ±0.5 degrees 

Air temperature resolution: 0.1 degrees 

Air temperature repeatability: ±0.2 degrees 

Air temperature drift: <±0.1 degrees/year

Air humidity measurement range: 0~100%RH 

Air humidity measurement accuracy: ±3%RH

Air humidity resolution: 0.1%RH  

Air humidity repeatability: ±1%RH

Air humidity drift: <±0.5%RH/year 

Measurement stabilization time: 2 seconds

Response time: <5 seconds

Product free calibration interchange 

TVOC parameters: 

TVOC measurement principle: nano semiconductor measurement technology 

Detection method: probe conductivity and TVOC concentration increase together 

Measurement range: 0-60ppm 

Measurement resolution: 0.01ppm  

Measurement accuracy: ±10%   

Probe life: >3 years

Measurement stabilization time: 15 seconds  

Response time: <5 seconds    

CO2 parameters:  

Measurement method: NDIR infrared measurement

CO2 measurement range: 0~5000PPM  

CO2 measurement accuracy: ±4%  

CO2 resolution: 1 PPM 

CO2 measurement repeatability: ±1% 

Preheating time: 180 seconds  

Response time: 60 seconds

Temperature compensation: available 

Wireless parameters: 

Networking mode: LoRaWAN1.0.3 protocol stack

Working mode: ClassA

Communication mode: data penetration

Data format: default 1,8, 1, SF10 (1 start bit, 8 data bits, 1 stop bit, no parity, SF10 baud rate)

Sampling frequency: rotary switch 2 first 3 bits set. 

Receive sensitivity:-140dBm

Communication distance: open outdoor> 2000 meters (external antenna, 20dBm, SF10); maximum distance up to 6KM, (external antenna, 20dBm, SF12)

Terminal category: slave station

Node address: 0~256, rotary switch hardware settings

Networking mode: star wireless network 

Maximum power consumption: 50mA

Static power consumption: 5uA

Hardware settings for off 

Operating environment: -20~50 degrees, 15~90% RH (no condensation)

Storage environment: -25~60 degrees

Working pressure: 0.9~1.1 atmospheres 

Power supply: The wireless sensor is powered by 1 section 2# lithium battery with ultra-low power consumption. It collects data once every 60 minutes, transmits power 18dBm, and has a battery life of >0.8 years in a normal temperature environment of 25°C. 

Application:

indoor, vehicle, warehouse, factory, environmental protection.

DECODE Example

function Decode(fPort, bytes, variables) {

  var paramLength = bytes[2]/2;

  var params = new Object();

  for(var i=0;i<paramLength;i++)

  {

    params[“param”+i] = bytes[3+i*2]*256+bytes[4+i*2];

  }

  return params;

}

TTN Decoder

function decodeUplink(input) {

var params = new Object();

params[“Temp”] = input.bytes[3]256+input.bytes[4]    

params[“Humi”] = input.bytes[5]256+input.bytes[6]    

params[“PM2.5”] = input.bytes[7]256+input.bytes[8]  

params[“TVOC”] = input.bytes[11]256+input.bytes[12]    

params[“CO2”] = input.bytes[13]256+input.bytes[14]     

params[“O3”] = input.bytes[17]256+input.bytes[18]     

params[“HCHO”] = input.bytes[11]256+input.bytes[22]

return {

data: params

};

}

Useful Link:

LT-M9500 LoRaWAN TVOC and eCO2 Temperature & Humidity Air Quality Sensor Node Connect to Dragino gateway and ChirpStack