The mining industry poses a problem for most photoelectric sensors, the highly contaminated environments make it difficult to operate and sense reliably. Telco Sensors has overcome this through its powerful high performance photoelectric sensors that ensure penetration of the harsh pollution to guarantee reliable detection.
Blocked chute detection is a common application in mining. The Telco Sensors system used for blocked chute detection consists of a PA 11 amplifier with transmitter (LT) and receivers (LR). Sensing ranges from, 18, 40, and 70 m with enough power to ‘see through’ build up contamination. A hole is drilled through the chute on either side so the transmitter and receiver can be mounted in through beam mode, out of the product stream and at the desired height to prevent build up that could damage the conveyor belt.
The amplifier has an on/off time delay adjustable to allow for large rocks to clear the view of the sensors before a signal is given. There is also a sensitivity adjustment on the PA, however at most installation sites in the South African mines full power is used to allow for dust, dirt and misalignment. These features have made Telco’s optical sensors a sought-after solution in tough of environments.
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