×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Need analog signal please help

Need analog signal please help

Need analog signal please help

(OP)
Gents,

Here is the deal, I have Flow meter FHKU 100 installed on disinfection system. The flow meter have +8V, GND and IN connections on control panel, and displays flow rate on control panel.
 I need an analog input (+,-) to the system to control the disinfection rate 0-20 mA or 4-20 mA. It will be perfect if i can get this signal from flow meter proportional to flow rate, meaning maximum flow 20 mA, no flow 0 or 4 mA.
 Is there any way to convert or get parallel signal from this flow meter.
 thnx in advance.
 cheerz

RE: Need analog signal please help

According to web specs for the FHKU 100, it has an open collector, pulse output, with the somewhat odd pulse rate of  "approx. 65 Imp./ l (Nozzle 10mm)"  [im]pulses per liter?

http://www.gsg-e-shop.de/onlineshop_e/onlineshop/index.html?d_FHKU_FHKU3034.htm

So, in answer to your question, if your controller needs an analog signal, you might consider
a)  getting a flowmeter that outputs flow rate directly as an analog signal.
b)  converting the open collector pulses to an analog flow rate signal with a frequency converter, a pulse-to-analog converter

Devices like the Precision Digital PD693 panel meter takes an open collector input, displays the flow rate and with an optional analog output provides an isolated 4-20mA flow rate signal.  
http://www.lesman.com/unleashd/catalog/digital/digind_pd692.html

Or the Phoenix Contact MCR-f-UI-DC, 2814605 is a DIN rail mount frequency converter, but it requires a software programming kit and cable to scale the output.

http://www.phoenixcon.com/products/interface/db/level1_2.asp?l0=MCR&l1=Frequency%

Or there are a hundred other I/O manufacturers' frequency converters that will do the job.

Dan

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources