DIGITAL & ANALOG SENSORS

Digital Signal

The signal which is in the form of “YES” or “NO”. In other word the signal which deals with “1” and “0”.

Digital Sensor

The device which sense any parameter and gives out-put in the form of 0 and 1 (“Yes” and “No”).

Example

Real time example:

If we ask any one. Is that fan is ON.

He/ She says that “YES” if the fan is “ON”, “NO” when the Fan is “OFF”.

Same question ask with a digital sensor deal with 24vdc.

it replies with”24V” for “ON” state and “0V” for “OFF” state.

Comparison of each response.

Fan state Human’s reply Signal state 24v sensor reply
OFF No 0 0V
ON Yes 1 24V

Note:

A real time electrical switch is an example of digital sensor.

Some more example:

Floater, limit switch, electrical switch, toggle switch etc.

Analog signal

The signal which is in the form of word or additional parameter with ON or OFF. In other word the signal which deals with low, medium high.

Analog sensor.

The device which sense any parameter and gives out-put in the form of 0 to 1 (0, 0.5, and 1).

Example

Real time example:

If we ask any one. In what speed fan is running.

He/ She may reply with slow or medium or high speed.

Same question ask with a digital sensor deal with 24vdc.

it replies with”24V” for “high speed” state, “0V” for “OFF” state, “8V” for “slow speed” state, “16V” for “medium” state

Comparison of each response.

Fan state Human’s reply Signal state 24v sensor reply
OFF No 0 0V
Slow speed Slow 0.3 8V
Medium speed Medium 0.6 16V
High speed High 1 24V

Note:

A real time electrical fan regulator is an example of analog signal provider.

Some more example:

Level transmit or, flow sensor, current sensor etc.

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