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Indoor air quality sensor

MCCI Model 4933 LoRaWAN decoder and payload format

The MCCI Model 4933 is a LoRaWAN indoor air quality sensor that reports temperature, humidity, pressure, CO2 and dust particles. It runs on a replaceable Li-ion cylindrical (ICR18650) battery and it works from -20 to 70 °C.

MCCI Model 4933
Official decoderDatasheetProduct 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)

38 FF 20 00 3B 33 2D CC C3 CC 03 9A 28 98 15 89 E3 78 60 78 60 00 54 C9 D9 00 1D 73 8C 00 00 00 01 CF 5C E9 9A EC CD DE EF 0A CD 07 C3 04 F6 0B 9A 00 1E 00 99 99 64 5F 67 E3 CD 09

Decoded (JSON)

{
  "COppm": 119.9951171875,
  "NO2ppm": 3.00048828125,
  "O3ppm": 12.000732421875,
  "SO2ppm": 7.0001220703125,
  "Vbat": 2,
  "Vbus": 3.699951171875,
  "boot": 45,
  "pc": {
    "10": 1,
    "2.5": 1930124,
    "1.0": 5556697
  },
  "pm": {
    "10": 1.046875,
    "0.1": 51.046875,
    "0.3": 48.046875,
    "0.5": 5.078125,
    "1.0": 4.041015625,
    "2.5": 2.4716796875,
    "5.0": 1.046875
  },
  "vCO": 0.675048828125,
  "vNO2": 0.485107421875,
  "vO3": 0.31005859375,
  "vSO2": 0.72509765625
}
FieldValue
COppm119.9951171875
NO2ppm3.00048828125
O3ppm12.000732421875
SO2ppm7.0001220703125
Vbat2
Vbus3.699951171875
boot45
pc.101
pc.2.51930124
pc.1.05556697
pm.101.046875
pm.0.151.046875
pm.0.348.046875
pm.0.55.078125
pm.1.04.041015625
pm.2.52.4716796875
pm.5.01.046875
vCO0.675048828125
vNO20.485107421875
vO30.31005859375
vSO20.72509765625

Specifications

Manufacturer
MCCI
Model
Model 4933
Type
Indoor air quality sensor
Measures
temperature, humidity, pressure, CO2, dust particles
Battery
Li-ion cylindrical (ICR18650) (replaceable)
Operating temperature
-20 … 70 °C
LoRaWAN regions
EU863-870, US902-928, AU915-928, AS923, KR920-923, IN865-867

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 MCCI Model 4933 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.