Case Study: IPH Inductive Proximity Sensor/Switch Detects Valve Position in Seed Facility

Slater, IA USA

Problem Summary

Seed processing from corn has various stages. The whole grain corn is brought in from the field on the cob and with husk intact. Trucks dump the corn and the corn is transported to the husker using vibratory feeding mechanisms. The husker equipment removes the corn husks and the corn, still on the cob, moves to the next step in the process where the corn kernels are removed from the cob. The corn shelling equipment perform this task. The cobs move in one direction and the kernels move along on a different path for further processing including treatment and drying. Throughout the entire process the computerized automation system directs and manages the flow and needs feedback as to position of valves and whether rotary and conveying equipment is moving or not.

Solution

Sensors for indicating valve position or movement, rotary airlock and conveyor operation must be low cost, compact and very reliable. One thing the valves, airlocks and conveyor rotating equipment have in common is they are manufactured from some type of metal. Sensing proximity and position of metallic objects is the job for the inductive proximity sensor/switch. These units, most commonly used in a 18mm diameter are very reliable, compact, low cost and can operate on DC or AC voltage, DC most commonly used where input to automation PLC’s is required. The Model IPH inductive proximity switch product line fits the bill and is used extensively for these applications in a wide variety of seed processing facilities through the USA.