Previous in Forum: How to Choose a Flowmeter   Next in Forum: Boiler Drums and Level Indicators
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
3 comments
Rate Comments: Nested
maddy2504
Participant

Join Date: Jun 2009
Posts: 1

Power Supplies and Loop-Powered Transmitters

06/29/2009 1:50 AM

Why 24VDC power Supply is used as standard for all loop powered transmitters? there is other power supply can we used for loop powered x-mitters?
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: Why 24VDC power Supply is used as standard for all loop powered transmitters?

06/29/2009 3:20 AM

24VDC just happens to be a nominal two lead-acid 6-cell batteries wired in series.

Any DC supply up to the limit of the device is OK. Some instruments will go to 35VDC, for example.

In all cases, follow the manufacturer's instructions.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
EElectrician
Power-User
United States - Member - New Member

Join Date: Aug 2008
Location: KY, USA
Posts: 367
Good Answers: 18
#2

Re: Power Supplies and Loop-Powered Transmitters

06/29/2009 5:07 PM

Non-standard voltage used to be the norm. Thankfully, some time ago a group of manufacturers got together and decided on something called a "standard." Life for people who work with such devices has gotten much easier since then.

__________________
 The most valuable of all talents is that of never using two words when one will do. ~Thomas Jefferson
Register to Reply
vmgarcia
Member

Join Date: Jul 2009
Location: Houston, Texas
Posts: 8
#3

Re: Power Supplies and Loop-Powered Transmitters

07/01/2009 9:25 PM

X-Meters, trnsducers, etc. for the most all run of 24VDC, that has become the standard, and since these are actually just transmitting Millivolts back to the Data Control System they do not require an extreme amount of high voltage, to perform their function, these transmitters are powered by 24 VDC but only output, any where from 4-20 Millivolts for a read out, in some cases the Millivolts are higher such as 5 to 30 but the standard is 4-20, this keeps things pretty standard and easy to find comparable brands that are interchangeable,

__________________
 “A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.”: Douglas Adams Quote
Register to Reply
Register to Reply
Have a Different Question?
3 comments
Copy to Clipboard

Users who posted comments:

EElectrician (1); PWSlack (1); vmgarcia (1)

Previous in Forum: How to Choose a Flowmeter   Next in Forum: Boiler Drums and Level Indicators

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Instrumentation:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (59 right now)
Show Members
Advertisement