COMET U0121G – IoT Wireless Datalogger with 4G Modem, 2 x External Pt1000 Probes

COMET U0121G – IoT Wireless Datalogger with 4G Modem, 2× External Pt1000 Probes (-200 to +260 °C ±0.2 °C), 500,000 Value Memory, SMS/JSON Alarm 

The COMET U0121G is a powerful IoT wireless datalogger with an integrated 4G modem (LTE Cat 1) – a self-contained and independent solution for remote monitoring and long-term recording of temperature using two external Pt1000 probes. Whether for cold chains, warehouses, climate chambers, cold rooms, transport, pharmaceutical production, the food industry, server rooms, or remote locations – the U0121G immediately sends SMS and JSON alarms over 4G when threshold values are exceeded. Regular JSON data transmission to the COMET Database or COMET Cloud (a complete monitoring, alarm, and analysis tool) can be configured. On-site alarm is indicated by LED, LCD, and buzzer. With 500,000 recorded values (non-cyclic) or 350,000 values (cyclic) and a traceable calibration certificate (EN ISO/IEC 17025), it is ideal for quality management, audits, temperature mapping, and ISO compliance.

The two external Pt1000 inputs measure temperatures from -200 to +260 °C (±0.2 °C from -50 to +100 °C, ±0.2% of the measured value above that). The acoustic and optical alarms immediately warn when freely adjustable limits are exceeded. Min/max values are stored. The illuminated LCD displays both channels simultaneously. The logger operates fully autonomously with its internal battery – no external power supply required. Data can be downloaded to a PC via USB-C. COMET Cloud: 3 months free, then 1 credit per year. The LTE FDD B1/B3/B5/B7/B8/B20 & GSM/GPRS/EDGE 900/1800 MHz modem ensures worldwide coverage and stable data transmission.

The datalogger is maintenance-free, long-term stable, and comes with a 3-year warranty. The included traceable calibration certificate guarantees maximum measurement accuracy from the factory. Intuitive configuration via LCD or COMET Cloud. Whether used as a mobile remote logger in transportation, as a stationary monitoring unit in cold rooms, or as a central device in production – the U0121G impresses with precision, autonomy, 4G connectivity, and ease of use. The two Pt1000 inputs also allow differential measurements (e.g., supply/return or product/ambient).

Why the COMET U0121G is the best IoT 4G datalogger for 2× Pt1000:

• Integrated 4G modem (LTE Cat 1) – SMS/JSON alarm & data transmission without WiFi/LAN
• 2× external Pt1000 inputs – dual temperature measurement for differential or redundant setups
• 500,000 value memory – non-cyclic or cyclic mode
• COMET Cloud – full monitoring, alarm & analysis (3 months free)
• Acoustic/optical alarm + LED – immediate on-site warning
• Wide measuring range – -200 to +260 °C (±0.2 °C core range)
• Illuminated LCD – simultaneous display of both channels
• Traceable calibration certificate included – EN ISO/IEC 17025
• Battery-powered autonomous operation – no external power needed
• 3-year warranty – COMET quality guaranteed

Technical data U0121G:

• External temperature (Pt1000): -200 to +260 °C (±0.2 °C from -50 to +100 °C / ±0.2% above)
• Resolution: 0.1 °C
• Channels: 2× external Pt1000
• Alarm: acoustic + optical + SMS/JSON via 4G
• Memory: 500,000 values (non-cyclic) / 350,000 values (cyclic)
• Internal recording interval: 1 s to 24 h
• COMET Cloud recording interval: from 5 minutes
• Measurement/alarm interval: adjustable to 1 s, 10 s, or 1 min
• Display: illuminated LCD
• Communication: 4G modem (LTE FDD B1/B3/B5/B7/B8/B20 + GSM/GPRS/EDGE 900/1800 MHz) + USB-C
• Power supply: internal battery (operating time several months/years depending on configuration)
• Operating temperature: -20 to +60 °C
• Protection rating: IP67 (device)
• Warranty: 3 years

Perfect for:

• Cold chain & transport monitoring (remote differential measurement)
• Warehouse and cold storage monitoring at remote sites
• Pharmaceutical and food production
• Climate chambers and incubators
• Product vs. ambient temperature (dual-channel)
• Quality management & audits
• Autonomous long-term logging without network connection
• Mobile inspection and service

Installation and operation – done in minutes

Connect the external Pt1000 probes, insert a SIM card (if desired), activate the battery – done! Set intervals, limits, and Cloud/SMS parameters, start logging – read data via COMET Cloud or USB-C. The illuminated display and the acoustic/optical alarm ensure safe and convenient operation. Calibration certificate included – ideal for audits and quality management.

Summary:

• The 4G datalogger is designed for temperature measurement using two external Pt1000 probes.
• If the configured limits are exceeded, SMS and JSON messages are sent via the 4G data connection.
• The measured values can be transmitted to the COMET Cloud, a comprehensive monitoring, alarm, and analysis system.
• Regular transmission of JSON messages to the COMET Database can also be configured; the sending interval is adjustable.
• Alarms are locally indicated via LED, LCD, and an integrated acoustic signal device.
• Data are stored in non-volatile electronic memory.
• Data can be transferred to a PC via the included USB-C cable.
• The device includes a traceable calibration certificate with declared metrological traceability of standards in accordance with EN ISO/IEC 17025.
• When purchasing a new IoT wireless datalogger with integrated modem, you receive 3 months of COMET Cloud access free of charge; after that, one credit is required per year of use.

Scope of supply:

• U0121G
• User manual
• Traceable calibration certificate
• Battery
• Power adapter
• USB-C cable
• Full version of COMET Vision analysis software (free)
• COMET Cloud access for 3 months
• External probes not included
• SIM card not included