we are currently working on a project 4-20mA isolator it should be hart compatible too

we tried lot of methods and we were not successful so someone please give me good advice on doing so.

our problem is the isolator should support bidirectional HART communication

 

The isolator must be designed to not strip off the HART data.

I believe Phoenix Contact has bidirectional HART isolators, probably Pepperl & Fuchs, too.

 

One of these could be useful to do this task:
http://files.pepperl-fuchs.com/selector_files/navi/productInfo/edb/202927_eng.pdf

http://files.pepperl-fuchs.com/selector_files/navi/productInfo/edb/132956_eng.pdf

http://files.pepperl-fuchs.com/selector_files/navi/productInfo/edb/223219_eng.pdf

 

>One of these could be useful to do this
>task:
>http://files.pepperl-fuchs.com/selector_files/navi/productInfo/edb/202927_eng.pdf

----snip----

i tried to look to links but it is not working
i could not download the pdf documents
help me please

 

Try writing the product numbers in the search tool (upper right side) of the P&F web site.

http://www.pepperl-fuchs.us/cps/rde/xchg/usa/hs.xsl/index.htm

132956
202927
223219

 

Looks like M-system and Moore Industries have HART compatible signal
isolators:

http://www.m-system.co.jp/english/products/isolate/isolate_page.html
http://www.miinet.com/products/sg_hart.shtml

I have not tried any of them so I have no idea if they are any good or not.

Note that sometimes when people say "isolators" they may be referring to "safety barriers" (associated apparatus) which at the same time are galvanically isolated (as opposed to old fashioned Zener barriers). These are also available with support for HART communication. MTL, P+F, Stahl, etc. have them.

To learn stuff you did not know about HART take a look at the yellow book "Fieldbuses for Process Control: Engineering, Operation, and Maintenance"
buy online:
http://www.isa.org/fieldbuses

Cheers,
Jonas

 

Hi.. You can use KFD2-STC4-EX1 for isolating analog input. It has Bi directional HART capability.
for analog output you can use KFD2-SCD2-EX1.LK, which has HART option also .

Regards,
Jayasimha A M
P+F- Bangalore
email: [email protected]-fuchs.com