COMET U0843G – IoT Wireless Datalogger with 4G Modem, 2 x External Pt1000 Sensors, 2 Binary/Dual-State Inputs

COMET U0843G – IoT Wireless Datalogger with 4G Modem, 2× External Pt1000 (-200 to +260 °C ±0.2 °C), 2 Binary/Two-State Inputs, SMS/JSON Alarm 

The COMET U0843G is a high-performance IoT wireless datalogger featuring an integrated 4G modem (LTE Cat 1) – a fully autonomous and network-independent solution for remote monitoring and long-term recording of temperature using two external Pt1000 probes plus two binary/two-state inputs (e.g., door/window contact, switch, relay state, pulse). Whether for cold chain management, warehouses, climate chambers, cold rooms, transport, pharmaceutical production, food industry, server rooms, machine monitoring, or remote sites – the U0843G immediately sends an SMS and JSON alarm over 4G when limits are exceeded or states change. Regular JSON data transfer to COMET Database or COMET Cloud (a complete monitoring, alarm, and analysis tool) can be configured. Local alarms are indicated by LED, LCD, and buzzer. With 500,000 values of memory (non-cyclic) or 350,000 (cyclic) and a traceable calibration certificate (EN ISO/IEC 17025), it is ideal for quality management, audits, temperature mapping, and condition monitoring.

The two external Pt1000 inputs measure temperature from -200 to +260 °C (±0.2 °C from -50 to +100 °C, ±0.2% of reading above, ±0.4% from -200 to -50 °C). The two binary/two-state inputs detect switching states (<0.4 V = low, >2 V = high, max. 30 V DC) or potential-free contacts (resistance <10 kΩ = on, >300 kΩ = off, minimum duration 1 s). The audible and visual alarms warn instantly when freely adjustable limits are exceeded or when a state-change occurs. Min/max values are stored. The backlit LCD simultaneously displays all channels. The logger operates completely autonomously on an internal battery – no external power source required. Data can be downloaded via USB-C to a PC. COMET Cloud: 3 months free, afterwards 1 credit/year. The LTE FDD B1/B3/B5/B7/B8/B20 & GSM/GPRS/EDGE 900/1800 MHz modem provides global coverage and reliable data transmission.

The datalogger is maintenance-free, long-term stable, and covered by a 3-year warranty. The included traceable calibration certificate ensures maximum measurement accuracy straight from the factory. Configuration is intuitive via LCD or COMET Cloud. Whether used as a mobile remote logger in transport vehicles, as a stationary monitor in cold rooms, or as a central device in production – the U0843G excels with precision, independence, 4G connectivity, binary inputs for state monitoring, and ease of use. The two Pt1000 inputs enable differential measurements (e.g., supply/return or product/ambient), while the binary inputs monitor door/window/switch status.

Why COMET U0843G is the best IoT 4G Datalogger for 2× Pt1000 + 2 Binary Inputs:

• Integrated 4G modem (LTE Cat 1) – SMS/JSON alarm & data transfer without WLAN/LAN
• 2× external Pt1000 inputs – dual temperature measurement for differential or redundant use
• 2× binary/two-state inputs – remotely monitor door/window/switch/relay status
• 500,000 measurement memory – non-cyclic or cyclic mode
• COMET Cloud – full monitoring, alarm & analysis (3 months free)
• Audible/visual alarm + LED – instant local alert
• Wide measurement range – -200 to +260 °C (±0.2 °C core range)
• Backlit LCD – all channels visible simultaneously
• Includes traceable calibration certificate – EN ISO/IEC 17025
• Battery powered – no external power supply required
• 3-year warranty – guaranteed COMET quality

Technical Data U0843G:

• Temperature external (Pt1000): -200 to +260 °C (±0.2 °C from -50 to +100 °C / ±0.2% above / ±0.4% from -200 to -50 °C)
• Resolution: 0.1 °C
• Binary/two-state inputs: <0.4 V = low, >2 V = high (max. 30 V DC), potential-free contacts (<10 kΩ = on, >300 kΩ = off, minimum duration 1 s)
• Alarm: audible + visual + SMS/JSON via 4G
• Memory: 500,000 values (non-cyclic) / 350,000 values (cyclic)
• Internal recording interval: 1 s to 24 h
• COMET Cloud upload interval: from 5 minutes
• Measurement/alarm interval: adjustable 1 s, 10 s, 1 min
• Display: backlit 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 depending on configuration – several months or years)
• 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 room monitoring at remote locations
• Remote door/window/switch monitoring
• Pharmaceutical and food production
• Climate chambers and incubators
• Product vs. ambient temperature (dual channel)
• Quality management & audits
• Autonomous long-term logging without mains connection

Installation and operation – completed in minutes

Connect external Pt1000 probes and binary signals, insert SIM card (if desired), activate the battery – done! Set intervals, limits, and Cloud/SMS options, start logging – view data via COMET Cloud or USB-C. The backlit display and audible/visual alarm ensure safe and convenient use. Calibration certificate included – ideal for audits and quality management.

Summary:

• The 4G datalogger is designed for recording data from two external temperature probes and two two-state inputs
• If preset limits are exceeded, SMS and JSON messages can be sent via the 4G data connection
• Measured values can be transmitted to the online storage COMET Cloud – a comprehensive monitoring, alarm, and analysis system
• Additionally, regular JSON data transmission to the COMET database can be configured; the sending interval is adjustable
• Alarms are locally indicated via LED, LCD, and an integrated acoustic signal
• Data are stored in non-volatile electronic memory
• Data transfer to PC via the supplied USB-C cable
• The 4G recorder comes with a traceable calibration certificate ensuring metrological traceability according to EN ISO/IEC 17025

Scope of delivery:

• U0843G
• User manual
• Traceable calibration certificate
• Battery
• Power adapter
• USB-C cable
• FREE full version of COMET Vision analysis software
• COMET Cloud for 3 months
• SIM CARD NOT INCLUDED
• External sensors NOT included