Comet U4440M – IoT Wireless Temperature, Relative Humidity, CO2 and Atmospheric Pressure Datalogger with built-in GSM Modem

• A solution for every need, every budget – economy and premium dataloggers
• High quality, accurate and stable sensors
• Built-in battery operated
• Built-in printer

GSM datalogger is designed to record temperature, humidity, atmospheric pressure, and CO2. In case of exceeded set limits, SMS and JSON messages can be sent via GPRS data connection. Measured values can be sent to the internet storage COMET Cloud, which is complete monitoring, alarm, and analysis system.

It is also possible to set the regular sending of JSON messages to COMET Database, the sending interval is adjustable. Alarms are also indicated locally by LED, LCD, and acoustically by built-in beeper. The recording is performed in non-volatile electronic memory.

The data can be transferred to a PC via included USB-C cable. GSM recorder includes a Traceable calibration certificate with declared metrological traceability of etalons is based on requirements of EN ISO/IEC 17025 standard.

Compact thermometer – hygrometer – pressure gauge – CO2 concentration meter

This model is designed to measure temperature, relative humidity, dew-point temperature, barometric pressure, and the concentration of CO2 in the air by internal sensors. Barometric pressure can be measured as absolute or recalculated to sea level. No additional probes or sensors can be connected. It is characterized by a simple and compact design and a relatively long response in the measured quantities, compare to the model with external probes.

The sensors are located under the grid on the front and side of the unit The device is suitable for measuring in places where there is no rapid change in temperature or relative humidity, and there is no condensation of water vapors.

The device is placed directly in the measured space, while the installation needs to ensure a sufficient level of GSM signal at the installation location. As the internal battery creates a parasitic heat during the charging period, the measurement accuracy may be affected by up to 1 ºC. In battery mode, this model has a significantly shorter battery life than models without CO2 concentration measurement.

For this reason, the measurement of CO2 concentration does not occur as often as the measurement of other variables. By default, this is 2 minutes with the option of extending up to 10 minutes (option available in the Vision software). We recommend that calibration of the relative humidity and temperature of this device in the laboratory be carried out with sufficient airflow (at least 1 m/s), but only after a thorough settling, which may take up to 4 hours. Due to low IP20 protection, this device is not suitable for dusty or water-borne areas.