Interested to Buy Any Domain ? << Click Here >> for more details...
what is the difference about HART, and 4-20mA signal?
- 8 Answers
- 42787 Views
- I also Faced
- E-Mail Answers
Answer Posted / khaled khreim
The HART Protocol is an acronomy of Highway Adressable
Remote Transducer,it uses the frequancy shift koeying
standard to impose digital communication on top of the 4-
20mA signal.
this enables a two way field communication to take place,
making it possible for additional info rather than the
process variable only.
Hart protocol is a Master/Slave protocol, the HART protocol
can be used in different modes like point to point or
multidrop for communicating info from/to smart fiel device
and the controller, the field device and the controller
should be HART enabled.
In general HART protocol opens two communication channels:
the first one is the 4-20mA normal signal for the measured
value using the 4-20mA current loop. And the second chanel
is the digital signal whic is imposed on the analog one.The
digital signal gives additional info about the field device
such as device status, diagnosis, and other types of info
| Is This Answer Correct ? | 15 Yes | 1 No |
Post New Answer View All Answers
what is isloted barrier how it works and what are the main purpose.how it make safe area.
how do calibrate the valves.. with clear manual
Which language of programing is popular? how can i learn it ?
How to Calibrate Interface Level Troll in field
how to calibrate corollaries (Mass flow meter)?
i need some objective type questions in instrumentation
Give an example where you had aproblem on the job, and tell me how you solved the problem. and the finalvoutcome.
i want formula for flow control.am doing project in flow control using orifice . i know value of the flow level(Q) . upstream(p1) pressure, orifice diameter(Do) , pipe diameter(Di) and oil viscosity(Vi) how can i calculate downstream pressure
How to find out the current of two motors having same power consumption but different RPM?
How can a d.p. Transmitter be calibrated?
defination of radial vibration?
Valve positioner and actuators in detail.
what is sil (safety integrity level
Calibration procedure for electro magnetic flow meter
Calibration of controller (pneumatic)
