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Indoor air quality sensor

Decentlab DL-PM LoRaWAN decoder and payload format

The Decentlab DL-PM is a LoRaWAN indoor air quality sensor that reports particulate matter, temperature, humidity and barometric pressure. It is rated IP43, it runs on a replaceable 2 C alkaline battery and it works from -10 to 50 °C.

Decentlab DL-PM
Official decoderDatasheetPartner page

Payload format

An uplink from the device as it arrives at the network server, and what the official decoder returns for it. Examples come from the decoder's own test cases.

Example 1 · fPort 1

Payload (hex)

02 1B 50 00 0F 0C 25 00 25 00 27 00 27 00 27 01 F5 01 07 01 2C 01 2D 01 2D 01 2D 67 BD 61 8D BD 10

Decoded (JSON)

{
  "air_humidity": {
    "displayName": "Air humidity",
    "unit": "%",
    "value": 41.63221740722656
  },
  "air_temperature": {
    "displayName": "Air temperature",
    "unit": "°C",
    "value": 24.35660461425781
  },
  "barometric_pressure": {
    "displayName": "Barometric pressure",
    "unit": "Pa",
    "value": 96800
  },
  "battery_voltage": {
    "displayName": "Battery voltage",
    "unit": "V",
    "value": 3.109
  },
  "device_id": 6992,
  "pm0_5_number_concentration": {
    "displayName": "PM0.5 number concentration",
    "unit": "1⋅cm⁻³",
    "value": 26.3
  },
  "pm10_mass_concentration": {
    "displayName": "PM10 mass concentration",
    "unit": "µg⋅m⁻³",
    "value": 3.9
  },
  "pm10_number_concentration": {
    "displayName": "PM10 number concentration",
    "unit": "1⋅cm⁻³",
    "value": 30.1
  },
  "pm1_0_mass_concentration": {
    "displayName": "PM1.0 mass concentration",
    "unit": "µg⋅m⁻³",
    "value": 3.7
  },
  "pm1_0_number_concentration": {
    "displayName": "PM1.0 number concentration",
    "unit": "1⋅cm⁻³",
    "value": 30
  },
  "pm2_5_mass_concentration": {
    "displayName": "PM2.5 mass concentration",
    "unit": "µg⋅m⁻³",
    "value": 3.9
  },
  "pm2_5_number_concentration": {
    "displayName": "PM2.5 number concentration",
    "unit": "1⋅cm⁻³",
    "value": 30.1
  },
  "pm4_mass_concentration": {
    "displayName": "PM4 mass concentration",
    "unit": "µg⋅m⁻³",
    "value": 3.9
  },
  "pm4_number_concentration": {
    "displayName": "PM4 number concentration",
    "unit": "1⋅cm⁻³",
    "value": 30.1
  },
  "protocol_version": 2,
  "typical_particle_size": {
    "displayName": "Typical particle size",
    "unit": "nm",
    "value": 501
  }
}
FieldValue
air_humidity41.63221740722656 %
air_temperature24.35660461425781 °C
barometric_pressure96800 Pa
battery_voltage3.109 V
device_id6992
pm0_5_number_concentration26.3 1⋅cm⁻³
pm10_mass_concentration3.9 µg⋅m⁻³
pm10_number_concentration30.1 1⋅cm⁻³
pm1_0_mass_concentration3.7 µg⋅m⁻³
pm1_0_number_concentration30 1⋅cm⁻³
pm2_5_mass_concentration3.9 µg⋅m⁻³
pm2_5_number_concentration30.1 1⋅cm⁻³
pm4_mass_concentration3.9 µg⋅m⁻³
pm4_number_concentration30.1 1⋅cm⁻³
protocol_version2
typical_particle_size501 nm

Example 2 · fPort 1

Payload (hex)

02 1B 50 00 0D 0C 25 67 BD 61 8D BD 10

Decoded (JSON)

{
  "air_humidity": {
    "displayName": "Air humidity",
    "unit": "%",
    "value": 41.63221740722656
  },
  "air_temperature": {
    "displayName": "Air temperature",
    "unit": "°C",
    "value": 24.35660461425781
  },
  "barometric_pressure": {
    "displayName": "Barometric pressure",
    "unit": "Pa",
    "value": 96800
  },
  "battery_voltage": {
    "displayName": "Battery voltage",
    "unit": "V",
    "value": 3.109
  },
  "device_id": 6992,
  "protocol_version": 2
}
FieldValue
air_humidity41.63221740722656 %
air_temperature24.35660461425781 °C
barometric_pressure96800 Pa
battery_voltage3.109 V
device_id6992
protocol_version2

Specifications

Manufacturer
Decentlab
Model
DL-PM
Type
Indoor air quality sensor
Measures
particulate matter, temperature, humidity, barometric pressure
Protection
IP43
Battery
2 C alkaline (replaceable)
Operating temperature
-10 … 50 °C
LoRaWAN regions
EU863-870, AS923, US902-928, AU915-928

Connect it to Cloud Studio IoT

  1. 1

    Register the device in your network server

    Add it to The Things Stack, ChirpStack, Actility ThingPark or LORIOT with its DevEUI, JoinEUI and AppKey and the frequency plan of your region.

  2. 2

    Apply the decoder

    In The Things Stack, pick the model from the device repository and its decoder is applied for you. In ChirpStack v4, paste the official decoder as the device profile's JavaScript codec.

  3. 3

    Connect the network server to Cloud Studio IoT

    Set up the integration once per network server; every device registered there then reaches Cloud Studio IoT with its decoded values.

  4. 4

    Build dashboards and alarms

    The decoded fields become device variables for dashboards, alarms by email or SMS, and scheduled reports.

See your Decentlab DL-PM on a dashboard

Start a free trial, add the device with its DevEUI and get dashboards and alarms from its next uplink.

Talk to us

Frequently asked questions

Device facts and decoder examples: The Things Network Device Repository (Apache-2.0) · commit 7693223, imported 2026-10-05.