Contact US

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.

Students Click Here

Float Switches replacement

Float Switches replacement

Float Switches replacement

I am looking for the option to replace 'classic' float switches used in sanitary pumping applications, with something more reliable with less maintenance.
Maybe some type of capacitive proximity switches?
We need four switches for LoLo, Lo, Hi, and HiHi alarm, connected to the PLC digital input card.
At the same time LoLo will be implemented into the hardwired circuitry (pump protection if analog level stop failed) as well.
HiHi will also go to the hardwired logic to provide backup pump start signal created by analog level indication and start setpoint.
Is there anyone with some experience in this matter?
Please suggest.

RE: Float Switches replacement

Vibrating fork type switches are the most reliable. If you can afford them, start there. Oriented correctly, they can self clean. Most can also provide a heartbeat output to alert of a switch failure. Start here: https://www.emerson.com/en-us/catalog/rosemount-sk...

You already have an analog sensor. The analog sensor should provide your high and low alarms (pump failure). The additional level switches are for the lolo and hihi and indicate a failure of the analog sensors.

Also. Consider using radar sensors for level as they can see through foam that may occur on the surface of the fluid. Pneumatic bubbler sensors work well provided you have a constant supply of air.

RE: Float Switches replacement

Hi TugboatEng,
Thank you for your prompt post.
Although Vibration Fork is excellent method, I am afraid is not suitable for wet well application.

RE: Float Switches replacement

Level Magnetic or ultrasonic level switches are reliable instrument devices. I set you a rosemont and  Ameteck web page.




RE: Float Switches replacement

The Ametek 675 Submersible Level Sensor was specifically designed to perform in sewer lift stations.



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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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