what is the difference between active and passive loop ?
Answers were Sorted based on User's Feedback
Answer / rahul sr
Passive Loop: The transducer must be provided by an
external power supply for its working. Then it generates
the signal according to the Process parameter. This may
have either 2 wires, 3 wires or 4 wires.
Active Loop: There is no need to give external power supply
for the transducer. The sensor itself generates signal
without giving power supply. This will have only 2 wires.
Is This Answer Correct ? | 39 Yes | 22 No |
Answer / anatoli
Active input - loop is powered from card/module
Passive input - loop is powered from external source
Output loops are always active.
Number of wires is irrelevant
Is This Answer Correct ? | 13 Yes | 2 No |
Answer / ali
Kindly check the data sheet of Stahl Transmitter Supply Unit
Field Circuit Ex i
Series 9160
and check 9160/13-10-11 as passive O/P & 9160/13-11-11 as active O/P .
Is This Answer Correct ? | 1 Yes | 1 No |
Answer / ali
If we consider temperature sensors for example , active sensors are like LM35 -3 wires, need supply - thermocouples 2 wires -don't need supply , but both of them give mV as O/P .
on other hand pt100 can't gives O/P voltage or current with or without supply .
Is This Answer Correct ? | 1 Yes | 2 No |
Answer / ram
Passive Loop : Two wired loop powered . It is consuming the
power and generates the signal acoording to the process
parameter values or inputs.
Active Loop : External Power supply or separate power
supply and Signals generates either two wire or four wire
concept.
Is This Answer Correct ? | 11 Yes | 13 No |
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