KELLER ARC-1 data logger

KELLER’s GSM-2 data logger with remote data transmission unit has been upgraded and renamed ARC-1, the Autonomous Remote Data Collector. Providing a simple way of remotely tracking pressure measurements, fill and water levels and monitoring limit values, the ARC-1 incorporates the same functions as the GSM-2 but also includes some additional features.

The product communicates via the 3G mobile network, or 4G if required. Radio modules also allow the device to be located via the mobile network. It is supplied with a micro SIM card, or an e-SIM on request.

The system status information, including battery status and signal strength, has been supplemented by a moisture sensor. A real-time clock (RTC) has also been integrated into the data logger, which continues running autonomously when the battery is changed.

At 48 mm in diameter, the cylindrical data logger can simply be placed into the top of a 2″-wide sounding tube standard in the groundwater measuring industry. It can be installed in a matter of seconds.

The housing is designed to withstand condensation and temporary flooding. The sealed antenna is covered by a lockable protective cap made of robust plastic. This protects against theft and damage by people or wild animals when level measurements are being taken in the open countryside.

Complete with energy-efficient electronics and a lithium battery (3.9 V/32 Ah), the logger can transmit the results of 24 measurements every day by email, SMS or FTP for up to 10 years. At its fastest, it can make one measurement/min.

With two input voltages (0–5 V), two digital inputs, one bus interface (RS485) to operate up to five level sensors and an optional SDI12 interface for water analysis devices, the data logger is a universal data collection module for wide-area measurement networks.

The product is available as a tube or box, with all designs available in 3G, 4G or LoRa versions. An intrinsically safe version of the box can be supplied on request. Existing GSM-2 data loggers can also be upgraded if the existing 2G network at the measuring point is no longer available.