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!

*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.

Jobs

Looking for a flow sensor

Looking for a flow sensor

(OP)
Hello,

currently I am working with high pressure hydraulic torque wrench pumps. I am looking for a flow meter with ability to integrate it in hydraulic system which pressure is up to 1000bar. The flow range of oil I need to measure is up to 7l/min. Could you please offer me a list of flow meters for my system? Also the sensor could have analog output either switching contact like PNP or NPN transistor. Thank you for your reply.

RE: Looking for a flow sensor

(OP)
Lets say the maximum pressure can be up to 700bar. Any suggestions?

RE: Looking for a flow sensor

Your hydraulic system probably has a positive displacement pump, With some slipage. Maybe you could just count revolutions to get close to your flowrate, in stead of the meter.

RE: Looking for a flow sensor

(OP)
Actually what I need to measure is status of oil flowing: flow or no flow. This indication could let me to stop the cycle in my system, when flow meter senses that oil stopped flowing into cylinder.

RE: Looking for a flow sensor

Why not use a flow switch?

RE: Looking for a flow sensor

mcastle,
I don't know where to get a "flow switch" or what technology it would represent. One thing you can do is put a dP gauge across some flow restriction that can't go all the way shut (a restriction orifice is a good choice). If there is a dP then you have flow. No dP? No flow.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist

RE: Looking for a flow sensor

Google it.

RE: Looking for a flow sensor

Thanks, I never look at stuff that small. Interesting range of technologies.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist

RE: Looking for a flow sensor

"Actually what I need to measure is status of oil flowing: flow or no flow. This indication could let me to stop the cycle in my system, when flow meter senses that oil stopped flowing into cylinder."

That is significantly different from the original question. Normally a pressure switch or valve is used to sense end of stroke on a cylinder. The pressure will rise to relief valve pressure at end of stroke. There are valves made just for this purpose.

RE: Looking for a flow sensor

(OP)
I am talking about the switch, which can sense flow/no flow with ability to output electrical signal to my microcontroller.

RE: Looking for a flow sensor

(OP)
What flow switches you could recommend for pressures up to 700bar? I can not find it in google.

RE: Looking for a flow sensor

You may have to directly contact some vendors to find something that goes to pressures that high. Some vendors are http://www.hydracheck.com/ http://www.hydac.com.au/ http://ph.parker.com/us/en/regulators-monitors-sensors-and-flow-control

Here is an off the shelf item that goes to 410 bar.

http://www.omega.com/pptst/FLMH_FLMW.html

Another option is an ultrasonic flowmeter. Something like this perhaps:

http://www.omega.com/pptst/FDT-40.html

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close