When customers design a Hall-effect-based sensor, should they be concerned that it will be adversely affected by fluids, dirt, etc.?
The presence of fluids or dirt in the space between the customer’s sensor and the target/magnet does not affect the Hall circuit operation. The presence of ferrous material (i.e. gear shavings), however, can affect the effectiveness of the circuit. Intrusion of contaminates into the Hall chip can cause catastrophic failure. It is strongly recommended that the customer application use a sensor design that can be sealed for exposure to harsh environments.
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