Remote Monitoring in Hazardous Areas via GPRS

R. Stahl’s (Germany) 9719-type GSM/GPRS modem, which combines a robust design with state-of-the-art technology and easy installation, allows users to fully benefit from the advantages of GSM/GPRS data

communication in zone 1 or 2 hazardous areas for the first time. Designed as a quad-band device, the 9719 modem is suitable for use in process plants in virtually all world regions. Thanks to IP67 protection, the unit can be installed in outdoor areas without an additional enclosure. The SIM card holder and the antenna interface are intrinsically safe (Ex i), thus enabling users to safely change SIM cards or install antennas in hazardous

areas. The modem is directly connected to a PLC, an Industrial PC or an OpenHMI via an RS232 interface. It comes with a wide range of functions which can be easily controlled via the same AT command set as conventional modems for standard industry applications. An LED display continuously indicates the modem status.

GSM/GPRS data communication has many uses in the process industry, e.g. monitoring unmanned pumping stations, remote tank farms or machines such as centrifuges or compressors. Users benefit not only from the fact that this communication technology is ideally suited for mobile applications: additionally, GPRS allows for the establishment of cost-efficient data connections which inform users about the status of plants or the fill level of tanks. Communication is thereby rendered independent from the infrastructure installed on location, and, unlike WLAN technology, no longer requires users to imple-ment their own radio network. R. STAHL supplies two versions of the modem, one integrated into a stainless steel enclosure, the other featuring a GRP enclosure. This design facilitates installation in the field.