COMET U4442G – IoT Wireless Datalogger with 4G Modem, External Temperature and Humidity Probe, Integrated CO₂ and Air Pressure Measurement

COMET U4442G – IoT Wireless Datalogger with 4G Modem, external T+RH probe (Digi/E), integrated CO₂ (0–5000 ppm ±50 ppm +2%) & air pressure (600–1100 hPa ±1.3 hPa) 

The COMET U4442G is a modern IoT wireless datalogger with an integrated 4G modem – a fully autonomous and independent solution for remote monitoring and long-term recording of temperature, relative humidity, dew point, CO₂, and barometric pressure. With an external T+RH probe (Digi/E series) for flexible placement and internal sensors for CO₂ (0–5000 ppm) and air pressure (600–1100 hPa), it is ideal for compressed air systems, compressors, dryers, warehouses, climate chambers, server rooms, greenhouses, pharmaceutical production, or anywhere temperature/humidity/CO₂/air pressure need to be monitored remotely – without local Wi-Fi or LAN.

When limits are exceeded, the logger immediately sends SMS and JSON alarms via 4G. Regular JSON data transfer to COMET Database or COMET Cloud (a complete monitoring, alarm, and analysis tool) is configurable. Local alarms are indicated via LED, LCD, and buzzer. The memory holds up to 1 million values (non-cyclic) or 600,000 values (cyclic) with an interval of 1 s to 24 h. Data download via USB-C to PC is possible. The backlit LCD displays all values simultaneously. The logger operates completely autonomously using an internal battery – no external power supply required. The included traceable calibration certificate (EN ISO/IEC 17025) guarantees maximum accuracy from the factory. COMET Cloud: 3 months included free of charge, then 1 credit/year.

The U4442G is maintenance-free, long-term stable, and comes with a 3-year warranty. Intuitive configuration via LCD or COMET Cloud. Whether used as a mobile remote logger on construction sites, a stationary monitor in remote facilities, or as a central unit in production – the U4442G impresses with precision, autonomy, 4G connectivity, and user-friendly operation. The external probe (sold separately) enables measurements in pipes, ducts, or confined spaces.

Why the COMET U4442G is the best IoT 4G datalogger with CO₂ & pressure:

• Integrated 4G modem – SMS/JSON alarms & data transmission without Wi-Fi/LAN
• External T+RH input (Digi/E) + internal CO₂ (0–5000 ppm) & air pressure (600–1100 hPa)
• 1 million data point memory – non-cyclic or cyclic
• COMET Cloud – complete monitoring, alarm & analysis (3 months free)
• Acoustic/visual alarm + LED – instant on-site warning
• Dew point & all humidity parameters – automatically calculated
• Backlit LCD – all values displayed simultaneously
• Traceable calibration certificate included – EN ISO/IEC 17025
• Battery-powered autonomous operation – no external power supply required
• 3-year warranty – guaranteed COMET quality

Technical data U4442G:

• Temperature & humidity: according to connected Digi/E probe
• CO₂ (internal): 0 to 5000 ppm (±50 ppm + 2% of reading at 25 °C and 1013 hPa)
• Air pressure (internal): 600 to 1100 hPa (±1.3 hPa at 23 °C from 800 to 1100 hPa)
• Dew point: according to connected Digi/E probe (±1.5 °C at T<25 °C and RH>30%)
• Resolution: 0.1 °C / 0.1 %RH / 1 ppm CO₂ / 0.1 hPa
• Alarm: acoustic + visual + SMS/JSON via 4G
• Memory: 1,000,000 values (non-cyclic) / 600,000 values (cyclic)
• Logging interval: 1 s to 24 h
• Measurement interval / display update: 0.7 to 5 s
• Display: backlit LCD
• Communication: 4G modem + USB-C
• Power supply: internal battery (operating time depending on configuration, several months/years)
• Operating temperature: -10 to +60 °C
• Protection class: IP20 (instrument)
• Warranty: 3 years

Perfect for:

• Compressed air systems & compressors (humidity + CO₂)
• Indoor air quality (CO₂ + pressure + T+RH) in offices, schools, hospitals
• Climate chambers and incubators
• Warehouse and cold storage monitoring
• Pharmaceutical and food production
• Server rooms and data centers
• Remote monitoring of isolated sites via 4G
• Quality management & audits

Installation and operation – done in minutes

Connect the external probe, insert the SIM card (if desired), activate the battery – done! Set intervals, limits, and Cloud/SMS options, start logging – read data via COMET Cloud or USB-C. The backlit display and acoustic alarm make use safe and convenient. Calibration certificate included – ideal for audits and quality management.

Summary:

• The 4G datalogger records temperature and humidity via external Digi/E probes, and air pressure and CO₂ via internal sensors
• When preset limits are exceeded, SMS and JSON messages are sent via 4G data connection
• Measurements can be transferred to the online storage COMET Cloud, a comprehensive monitoring, alarm, and analysis system
• Regular transmission of JSON messages to the COMET database can also be configured; the transmission interval is adjustable
• Alarms are indicated locally via LED, LCD, and acoustically via an integrated buzzer
• Recording is stored in non-volatile electronic memory
• Data can be transferred to a PC via the included USB-C cable
• The 4G recorder includes a traceable calibration certificate providing declared metrological traceability of the standards according to EN ISO/IEC 17025
• When purchasing a new IoT wireless datalogger with integrated modem, you receive 3 months of COMET Cloud free of charge; for a full year of use in COMET Cloud, 1 credit is required thereafter.

Scope of delivery:

• U4442G
• User manual
• Traceable calibration certificate
• Battery
• Power adapter
• USB-C cable
• Full version of COMET Vision analysis software
• COMET Cloud for 3 months
• External probes not included
• SIM card not included