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Continuous sensors convert a physical variable (like distance, pressure, or temperature) into a proportional electrical signal. This signal typically follows a standard industrial scale:

Analog Signals: Usually 4-20mA or 0-10V. The 4-20mA standard is preferred in industrial plants because it is resistant to electrical noise and can detect a broken wire (0mA).
Digital Communication: Modern sensors use protocols like IO-Link, Modbus, or HART to send precise numerical values and diagnostic data to a controller.

Feature	Discrete (Point) Sensor	Continuous Sensor
Output	Binary (On/Off)	Variable (e.g., 12.4mA)
Data Provided	Threshold reached	Exact real-time value
Example	Tank is full"	Tank is at 64.2%"
Complexity	Simple, low cost	Higher precision, requires scaling

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