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WAGO takes a dive into Zone 0

12 June 2009

Wireless communication via Bluetooth® and GSM/GPRS is a cost-effective solution that eliminates cables. In the WAGO stand at Hannover Messe one could see another useful idea for wireless: it is a novel way to go into dangerous areas and monitor data.

Martin Witzsch
Martin Witzsch

In conjunction with its partner ORI Abwassertechnik GmbH, WAGO was showing a two-step wireless process to accomplish this. The first step uses Bluetooth to transmit data from Zone 0 to Zone 1 (photo below). The exhibit simulated a pH sensor inside a clear plastic tank filled with liquid. An advantage of wireless technology is that it is largely independent of the sensor protection type used—no additional Ex barriers are required.

From Zone 1 to the safe world of the central control station was handled by GSM, shown on the other side of the exhibit. Martin Witzsch (photo at right) said the system, called ExBox, is an all-in-one, ATEX II 2G IIB T4 certified solution.

All WAGO components are encapsulated in a pressure resistant housing (third photo). Equipped with a 2-port ETHERNET controller, 2-channel relay output module for warning lights, 4-channel analogue input module (4-20mA), two serial interface cards and EMBT 2.2 ORI Bluetooth Module, the ExBox provides connection for both conducted and radio signals.

sensor in zone 0
sensor in zone 0

Data transmission to a Web server is performed by the controller and GPRS router, which can be used in hazardous environments via ORI EPS limiter. The Web server provides fast data access from any location. The Bluetooth Module can work with up to seven sensors.

SMS fault alarms can also be sent via additional Web services.

The "Ex Box" from the WAGO TO-PASS® Series will be available end of second quarter 2009.

TO-PASS® Ex Box provides wireless and conducted signal
TO-PASS® Ex Box provides wireless and conducted signal

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Third photo: TO-PASS® Ex Box provides wireless and conducted signal transmission within Zones 1 and 2 hazardous areas.

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