what is the difference between active and passive loop ?

Categories >> Engineering >> Instrumentation
Suggest New Category

Question Posted / kb.syamkumar

8 Answers
41183 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

what is the difference between active and passive loop ?..

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 ?

40 Yes

22 No

what is the difference between active and passive loop ?..

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

what is the difference between active and passive loop ?..

Answer / tarique

unclear and wrong

Is This Answer Correct ?

4 Yes

3 No

what is the difference between active and passive loop ?..

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

what is the difference between active and passive loop ?..

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

what is the difference between active and passive loop ?..

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

what is the difference between active and passive loop ?..

Answer / zamin ali

active and passive loop diffrance

Is This Answer Correct ?

0 Yes

2 No

what is the difference between active and passive loop ?..

Answer / r.kalaiselvan

active two wire
passive four wire

Is This Answer Correct ?

12 Yes

17 No

Post New Answer

More Instrumentation Interview Questions

what is formula for calculating flow if i have pressure and pipe diameter?

1 Answers

How would you choose differential range?

0 Answers

I wnat to practice more online type questions .so will you show them me to take a practice test?

1 Answers VA Tech Wabag,

what is modbus & what signals are taken through it

2 Answers

How can we use feedback signal frm rtd for monitoring and in dcs for controlling ,then which type of rtd is sutaible 2 , 3,4wire and why ?

0 Answers

what is PID n give me brief info. about P&I&D.

2 Answers

䑰ҕ䔈ҕ䖠ҕ䘰ҕ䛀ҕ䝐ҕ䟐ҕ䢐ҕ䥐ҕŹ

0 Answers

can install leveltrol in steam drum for measurment the level of steam drum? if not then why?

1 Answers

What are difference between automatic and manual control system?

5 Answers

tell me the field & lab calibration procedure step by step with diagram of pressure gauge, pressure switch, pressure transmitter, temperature switch, level switch, flow switch, flow transmitter, temperature transmitter, temperature indicator, flow indicator, level indicator, control valve, thermocouple, pressure indicator (digital & analogue),

0 Answers

Displace type LT to be calibrated in workshop, wt. 40, dia- 60 mm, density- 0.8kg/cm3.

0 Answers CCIE,

Why we are using sqare root in flow?

4 Answers

For more Instrumentation Interview Questions Click Here