COMET U3120 – Data Logger with Internal Temperature and Humidity Sensors

COMET U3120 – robust data logger with internal sensors (-30 to +70 °C ±0.4 °C / 0–100 %RH ±1.8 %), dew point -60 to +70 °C, 500,000 value memory 

The COMET U3120 is a robust and compact data logger with integrated temperature and humidity sensors – the ideal solution for independent long-term monitoring and documentation of indoor climate conditions in warehouses, cold rooms, server rooms, climate chambers, incubators, archives, offices, greenhouses, or anywhere temperature, relative humidity, and dew point must be recorded without external probes. With a large memory capacity of 500,000 values (non-cyclic) or 350,000 values (cyclic), a freely adjustable logging interval (1 s to 24 h), and a traceable calibration certificate (EN ISO/IEC 17025), it is perfect for quality management, audits, ISO compliance, and temperature mapping.

The internal temperature sensor measures -30 to +70 °C (±0.4 °C), and the humidity sensor 0 to 100 %RH (±1.8 %RH). Dew point is calculated automatically (-60 to +70 °C, ±1.5 °C at T<25 °C and RH>30 %). The acoustic and optical alarm (buzzer + LED) immediately warns when freely adjustable limits are exceeded. Min/Max values are recorded. The backlit LCD display is easy to read, and measurement/alarm update intervals are adjustable (1 s, 10 s, 1 min). The logger operates autonomously with a 3.6 V AA lithium battery – lifetime of several years depending on the logging interval. No external power supply required – ideal for fixed or mobile installations. Recording non-cyclic (stops when memory is full) or cyclic (overwrites oldest data). Real-time clock with date and time. Data transfer to PC via USB-C (COMET Vision software).

The data logger is maintenance-free, long-term stable, and comes with a 3-year warranty. The included traceable calibration certificate ensures the highest measurement accuracy from the factory. Intuitive control via buttons and a clear menu. The robust housing with IP67 protection (electronics) and IP30 (sensors) makes it resistant to dust and splashing water. Whether used as a stand-alone logger in production, a portable tester in service, or a fixed part of a monitoring system – the U3120 impresses with precision, durability, and ease of use. No external probe is required – ready to use immediately for indoor applications.

Why the COMET U3120 is the best data logger with internal T+RH sensors:

• Internal sensors – ready to use, no probe required
• 500,000 value memory – non-cyclic or cyclic
• Logging interval freely adjustable – 1 s to 24 h
• Acoustic & optical alarm – instant warning when limits are exceeded
• Min/Max memory – extreme values per channel
• Backlit LCD – temperature, humidity, and status readable
• Traceable calibration certificate included – EN ISO/IEC 17025
• Self-contained battery operation – lithium AA, several years lifespan
• IP67 protection (electronics) – dust and splash resistant
• 3-year warranty – guaranteed COMET quality

Technical data U3120:

• Internal temperature: -30 to +70 °C (±0.4 °C)
• Internal humidity: 0 to 100 %RH (±1.8 %RH)
• Dew point: -60 to +70 °C (±1.5 °C at T<25 °C and RH>30 %)
• Resolution: 0.1 °C / 0.1 %RH / 0.1 °C dew point
• Channels: internal temperature and humidity sensor
• Memory: 500,000 values (non-cyclic) / 350,000 values (cyclic)
• Logging interval: 1 s to 24 h
• Measurement/alarm update: adjustable 1 s, 10 s, 1 min
• Alarm: acoustic (buzzer) + optical (LED) at limit exceedance
• Display: backlit LCD
• Power supply: lithium battery 3.6 V AA
• Operating temperature: -30 to +70 °C
• Protection rating: IP67 electronics / IP30 sensors
• Dimensions: 61 x 93 x 32 mm
• Weight (including battery): approx. 120 g
• Warranty: 3 years

Perfectly suited for:

• Warehouse and cold room monitoring
• Server rooms and data centers
• Pharmaceutical and food production
• Climate chambers and incubators
• Offices, archives & museums
• Greenhouses & agriculture
• Quality management & audits
• Autonomous long-term logging without mains connection

Installation and operation – ready in minutes

Insert the battery – done! Set intervals and limits, start logging – read the data via USB-C. The backlit display and the acoustic/optical alarm ensure safe and convenient operation. Calibration certificate included – perfect for audits and quality management.

Summary:

• The data logger is designed for recording temperature and humidity
• Recorded data are stored in non-volatile electronic memory
• Data can be transferred to a PC via USB-C
• If preset limits are exceeded, alarms are indicated by LED, LCD, and acoustic signal
• The recorder includes a traceable calibration certificate
• The metrological traceability of standards complies with the requirements of EN ISO/IEC 17025.

Scope of delivery:

• U3120
• User manual
• Traceable calibration certificate
• 1× 3.6 V lithium battery
• Free full version of COMET Vision analysis software
• USB communication cable not included