Answer / ayaz

250 ohm  use in loop only for hart protocol and use only smart devices 

Answer / ashraf

According to the HART Foundation spec, the 1200-2400 Hz HART signal needs a minimum (230 ohm) resistance in the loop to create a HART signal with enough amplitude to meet the sensitivity requirements of a HART modem receiver.

Answer / hitesh

convert analog signal 4-20mA to digital signal 1-5V

Answer / nitesh kumar

For converting 4-20 mA 

Answer / nilesh66in

The power supply is a low impedance to the hart signal
shorting it out. Adding the resistor raises the impedance
so that the signal can be detected by the calibrator. The
HART protocol uses 1200 baud Frequency Shift Keying (FSK)
based on the Bell 202 standard to superimpose digital
information on the conventional 4 to 2OmA analog signal.


Nilesh Bhagwat ( Sr. Inst Tech)

Answer / ritesh patel

convert output of digital to analog

what is metal of piston ring

0 Answers   MahaGenco,

why thermocouple called thermocouple?

4 Answers  

WHAT IS D/O D/I AND A/O A/I PLZ EXPLAIN

2 Answers  

can any send me a forbes marshall dtron 316 manual

0 Answers  

what are different types of cables used in instrumention how to calibrate a level transmitter online ( rosemount )

1 Answers  

why 8bit microprocessor referred as 2^16?

2 Answers  

what is the use of glycol filling in seal pot (or) condensate pot in instrument impluse line?

7 Answers  

what type problems create in radar level transmeter and what is its solution

2 Answers   Essar,

Im having problems with interfase betwen SPI v7.0 and SPPID v5.05. Previous versions of Intools shoul be fixed with SPPIDproj.ocx file. It was necessary to replace this file with one that allows the connection between different versions of SPPID. It is necessary in the current version to do the same?Thanks

0 Answers  

What FLOW METER generally used in Gas plant?

5 Answers   Gasco,

What is difference between ESD and PLC please Explain me clearly.

0 Answers  

how we will install a positioner ?

2 Answers   Descon,