Electrical Characteristic¶
Power supply¶
This section provides detailed instructions on correctly connecting the device to power sources and other essential components. It outlines both available power options: USB-C and battery. Following these steps carefully is crucial to ensuring the device operates safely and reliably.
Power supply via battery¶
Power supply via USB-C¶
Battery monitoring¶
If the logger is used with batteries, the battery status is monitored and shown on the device display with a 3 segment battery symbol.
0 of 3 segments means battery >10% remaining battery capacity. The battery status is also transmitted to the RMS-SW. The battery percentage is displayed numeric.
The battery monitoring is carried out once per hour.
The logger can recognize whether a alkaline or a lithium battery is used. Rotronic recommends the use of Energizer L91 AA Ultimate Lithium 1.5 Volt (3000mAh). The battery monitoring for lithium is designed for this battery type. The battery capacity of alkaline batteries is monitored by simple voltage measurement.
The logger can also be powered by USB-C (see below). If USB-C and batteries are used, the logger will be supplied by the USB-C cable. The logger still monitors the battery to indicate battery aging. In case of USB-C power interruption, the batteries are the power backup and takeover without interruption. On the device display, there is no battery symbol shown.
If USB-C is used to power the logger (without battery), the battery status in the RMS-SW is "---". On the device display, there is no battery symbol shown. In case of power interruption of the USB-C power supply, the logger turns off immediately. The logger does not have a time stamp anymore and does not continue to log data. A data gap is created. After the power is coming back, the device synchronizes with the server time and continues logging.
Energy consumption¶
Battery life¶
| 1 min. | app. 7 month | app. 5 month |
|---|---|---|
| 5 min. | app. 13 month | app. 10 month |
| 15min. | app. 14 month | app. 11 month |
| Note: The battery life time is an estimation. It varies if - Batteries are aged (older production date) - Ambient temperature differs strongly from 23°C, especially for low temperatures. - Signal strength of the WiFi connection to the access point (router) is low. - Strong WiFi noise of the environment due to many other WiFi networks, mobile phones or other WiFi devices. **Those factors can influence the current consumption and battery life time significantly. In this case, please use the option of a power supply by USB. ** |
|---|
Current consumption when USB-C powered¶
| Current consumption | app. 30mA AVG at 5V when logger is active |
|---|---|
NTC sensor connection¶
Terminal block (2 pole - see picture above). Polarity does not need to be considered.
Updated: 15.04.2026