Therm•A•lert-RH Data Logger

Precision wireless humidity and temperature data logger. Includes NIST traceable calibration certificate.

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The MadgeTech Therm•A•lert-RH data logger is a humidity and temperature monitoring and alarming system. Designed specifically for laboratories, warehouses and other environmentally monitored spaces, the Therm•A•lert-RH provides real time wireless notifications of humidity levels as well as temperature.

This data logger features user programmable alarms that can be configured to send an alert on-screen, via text message (standard SMS rates apply), or via e-mail if an alarm condition is met.

The Therm•A•lert-RH data logger is equipped with two-way wireless communication, meaning that one PC can provide control and communication to all the wireless loggers within range. The system can also be divided into smaller subnets (using a different RF channel).

In addition to the data being transmitted wirelessly, the Therm•A•lert-RH also stores each reading to non-volatile internal memory for secure backup. Users can also set up automatic archiving in order to assure that all data is saved and retained to comply with federal regulations.

Countries approved for use, purchase and distribution of the Therm•A•lert-RH:
Australia, Austria, Belgium, Bulgaria, Canada, Chile, Colombia, Croatia, Cyprus, Czech Republic, Denmark, Ecuador, Estonia, Finland, France, Germany, Greece, Honduras, Hungary, Iceland, Ireland, Israel, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Mexico, New Zealand, Norway, Peru, Poland, Portugal, Romania, Saudi Arabia, Singapore, Slovakia, Slovenia, South Africa, Spain, Sweden, Switzerland, Thailand, The Netherlands, Turkey, United Kingdom, United States, Venezuela, Vietnam

The Therm•A•lert-RH data logger is cloud ready providing users the ability to monitor data remotely on any smartphone, tablet or internet enabled device.



Temperature Sensor Semiconductor
Temperature Range -20 °C to +80 °C (-4 °F to +176 °F)
Temperature Resolution 0.01 °C (0.018 °F)
Temperature Calibrated Accuracy ±0.5 °C (0 °C to +50 °C)


Humidity Sensor Semiconductor
Humidity Range 0 %RH to 95 %RH non-condensing
Humidity Resolution 0.1 %RH
Humidity Calibrated Accuracy ±3.0 %RH (±2 %RH typical at 25 °C / 77 °F)


RF Carrier Frequency 2.45 GHz IEEE 802.15.4 ultra-low power MadgeNET wireless transceiver with fully bi-directional communication
Output Power +0 dBm typical
Receiver Sensitivity -95 dBm typical (RFC1000)
Typical outdoors Line of sight Up to 2000 ft
Typical Indoors line of sight Up to 500 ft


Memory 15,000 readings per channel
Reading Rate 1 reading every 2 seconds up to 1 reading every 24 hours
Battery Life 2 years Typical
Material ABS Plastic
Dimensions 2.2 in x 5.25 in x 1.3 in (55 mm x 133 mm x 33 mm)
IP Rating IP20
Operating Environment -20 °C to +80 °C (-4 °F to 176 °F), 0 %RH to 95 %RH non-condensing
Required Interface Package RFC1000
Approvals US (FCC), CA (IC), CE

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“Industrial Technical Services is a single source Instrumentation and Automation company. We provide certified calibrations, PLC programming, custom controls and Panels”.


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