The 70 Series GO Switch can be used on conveyor belts as an alignment switch. Belt alignment is critical for a coal or limestone conveyor.
Coal is needed to fuel the boilers and limestone is used for scrubber media. In both cases, a conveyor belt that is not aligned can cause complete failure of the conveyor, or reduce the efficiency of the conveyor to carry the materials to the boiler or scrubbers. In Mpumalanga and other rich coal areas, there may be kilometres of conveyors moving coal directly from the mine to a power plant.
Conveyors can be found at the slurry pit, going to the scrubber unit, and to the boiler area where the coal is pulverised to make it burn more efficiently. The same problem is faced in the mining industry in general.
For this application, the 70 Series GO Switch is installed into a unit that has a tensioned arm that 'rides' with the conveyor belt. If the belt comes out of alignment, the tension arm moves. When this happens, the 70 Series GO Switch sends a signal to the conveyor to shut down, slow down or perform a command that the end-user specifies in the software. This is advantageous compared to the use of mechanical switches (with bumper type or whisker type lever arms).
With mechanical switches, coal lime often cakes up on the lever arm, causing the lever arm or whisker to break or fail. Mechanical switches are also susceptible to water and dust ingression into the switch. The 70 Series GO Switch is ideal in these environments when used in the belt alignment assembly or dusty applications in general.
70 Series GO Switches are generally used for applications where target is very repeatable and higher resolution is required.
In addition, the 10 Series and 20 Series GO Switches with potted leads can be used on conveyors to detect speed in Class 1 Div. 1 or 2 applications. They send a signal pulse to a PLC or counter indicating whether the speed is under, over or zero compared to the desired speed. Generally, inductive proximity or Hall effect switches are used and fail because of the extreme physical abuse and water or coal dust ingression. The 10 Series and 20 Series GO Switches are an effective solution.
Other applications such as soot blower indication, dampers, scrubber valves and boiler igniters are good examples of where GO Switches can also be used.
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