Keller AG introduces a new universal, energy-optimised radio module with integrated data logger.
Keller’s GSM-2 remote data transmission unit and the free PC software allow users to conveniently observe levels, measurements and trends, and monitor limits from the comfort of their office in applications as diverse as checking groundwater levels, waste water levels and the filling levels of mobile tanks on vehicles.
Featuring a cylindrical design with a diameter of just 48mm, the GSM-2 allows the data logger, which self-dials in accordance with user requirements, to be placed on the top of a normal 2-inch diameter sounding pipe that is used in groundwater measuring equipment. The housing is designed to withstand condensation and being under water for short periods. The GSM antenna is covered with a lockable covering cap made from solid plastic, protecting the data logger against theft and vandalism when level measurements are being taken outdoors.
Key features of the GSM-2 remote data transmission unit include energy-efficient electronics and robust lithium battery (3.9 V/32 Ah); ability to send results of 24 measurements to a PC at headquarters for up to 10 years by e-mail, or transfer them to a mobile phone via SMS; maximum measuring speed of 1 measurement per minute; and two voltage inputs (0 - 2.5 V), two digital inputs, a BUS interface (RS 485) for operating up to five level sensors or optionally the SDI12 interface for water analysis units.
Designed for quick installation, Keller’s GSM-2 data logger is a universal data acquisition module for wide area measuring networks.
An air pressure sensor and a temperature sensor are already integrated in the GSM-2, especially for taking level measurements using pressure sensors with long-term stability such as the Keller 30 series. The actual sensor no longer has to be connected to the ambient air via a capillary tube in the supply cable. The measuring accuracies that can be achieved from the difference between the probe signal and the air pressure signal are within the range of a few millimetres.
Keller’s new remote data transmission unit comes with the GSM2 DataManager, a flexible, convenient and free software that takes over the key functions of a monitoring, acquisition, control and organisation unit. The DataManager acquires the measurements, allocates them, displays them in graphical format, provides a signal when limits are exceeded and then stores them in a mySQL database for which no licence fee is required. Third parties can access the measurements using various export and Internet functions and integrate them in their data acquisition systems. All parameterisation and monitoring of the individual GSM-2 data loggers are also carried out using the GSM2 DataManager software.