In-process inspection is done at all stages of production.
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Nickel Iron wire is checked for physical dimensions, surface defects, and hardness.
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The wire is spin straightened and pressed into reed blades. The pressed reed blades are checked for physical dimensions, straightness, and visual defects.
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Reeds are degreased to remove grease and oil. The plant has a built in cooling system to minimize vapour loss.
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Degreased reeds are annealed to soften them and to reduce magnetic remanance. Magnetic remanance checks and hardness checks are carried out after annealing.
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Annealed reeds are loaded into carriers and plated as per required differential, load, and contact specifications.
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A few samples of plated reeds are checked for microns of precious metal plating and double checked with differential tests.
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Plated blades are baked out in a controlled atmosphere to burn off surface organics.
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Baked out reeds and pre-cleaned glass tubes are sealed in an inert atmosphere in automatic assembly machines.
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Reed switch terminal ends are Tin plated for solderability.
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Lead out plated reed switches are dry buzzed for 4 million operations for stabilizing the contact.
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Buzzed reed switches are sorted into required sensitivity bands. Other parameters like static and variable contact resistance are also measured 100%. Sorted switches are packed and shipped.
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