Next , mining activities can generate a significant amount of electromagnetic interference ( EMI ), which can interfere with wireless signals . Furthermore , mining applications often take place in harsh environments where temperature , humidity and dust levels can place excessive strain in communication equipment .
Finally , the distances involved are also a big hurdle to overcome for many transmission options . Copper wiring is extremely costly and , when required to run over many kilometres , the costs are often prohibitive . Furthermore , copper systems do not even guarantee reliable transmission over those distances . For example , standard communication links on copper wires like RS 485 are generally limited to about a kilometre of reliable transmission .
Therefore , to overcome all these challenges and ensure ongoing worker safety , the mining industry must source signal transceiver modules that can operate
reliably even in the harshest of environments .
Bidirectional fibre optic modules offer new possibilities
Omniflex ’ s new FCX module is a bidirectional transceiver , meaning it combines both transmission and reception capabilities into one device . This eliminates the need for separate modules , halving the number of modules required in any given setting and dramatically reducing costs for purchasing and installation . Costs are reduced further because fibre optic cabling is much cheaper than copper , so , as well as needing less modules , the cost per module is also lower .
To set the units up , users should place one module at either end of a duplex fibre optic link and when the contact on the first is closed , the other module is energised replicating the contact signal .
The transceiver is compatible with either 850 nm multi-mode or 1310 nm single mode fibre optic cabling ; the latter can send switch contact signals up to 20 km of range . The FCX is powered from a 10-30 Vdc power supply and the device can operate in a range of 0-60 degrees Celsius .
The FCX can also be used in nuclear radiological safety warning signals and monitoring and controlled shutdown of electrical substations . The FCX is certified for use in SIL-2 applications , meaning system designers can trust that the risk associated with transmitting switch contact signals over long distances can be limited to appropriate levels using the module .
With many years of experience in providing SIL-rated safety systems across mission critical industries , Omniflex is well placed to identify and provide the most suitable solution for any given application .
To find out more about the FCX ’ s remote safety applications in the mining industry , visit Omniflex ’ s website : https :// www . omniflex . com / dsview . php ? hid = C2477A .
For further information , please visit www . omniflex . com
Issue 69 PECM 27