Is an Automated Tapping Device the Solution to My Flowmeter Issue?

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Discussion Overview

The discussion revolves around the issue of flowmeters (specifically rotameters) that are experiencing a drop in readings over time. Participants explore potential solutions, including the idea of an automated tapping device to mimic manual tapping as a temporary fix. The conversation touches on both the technical aspects of the flowmeters and the practicality of implementing a device to address the problem.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes the issue of flowmeters dropping in readings and the temporary solution of tapping them with a wrench every 20 to 30 minutes.
  • Another participant questions whether replacing one of the problematic rotameters resolves the issue at that location, suggesting that identifying the root cause may be more effective than using a workaround.
  • A third participant recalls that similar issues with mechanical gauges were common in the past and emphasizes the importance of addressing the underlying problem rather than relying on temporary fixes.
  • There is a suggestion that a solenoid and bell clapper mechanism could serve as an automated tapping device, which could be controlled by a timer or a nearby PC.
  • A participant expresses curiosity about the historical use of a miniature solenoid and bell clapper in early radio receivers.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to solve the flowmeter issue. While some suggest focusing on the root cause, others explore the feasibility of an automated tapping solution. The discussion remains unresolved regarding the effectiveness of either approach.

Contextual Notes

The discussion does not clarify the specific reasons for the rotameters' malfunction or the conditions under which they drop in readings. There are also no detailed specifications provided for the proposed automated tapping device.

Who May Find This Useful

Individuals interested in flowmeter technology, automation solutions for mechanical issues, or historical applications of solenoids in engineering may find this discussion relevant.

Rohan Gupta
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I am looking for some device that can emulate someone tapping with a wrench every 20 minutes.

More specifically, I have noticed that in my application, my flowmeters (rotameters) are dropping over time. As a workaround I have been able to tap them with a wrench every 20 to 30 minutes, this causes the rotameters to rise back up to their original flow rate reading. The fluid in this case is chilled city water.

The device I am looking for must be small and not take too much space.

Thanks!
 
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Rohan Gupta said:
I am looking for some device that can emulate someone tapping with a wrench every 20 minutes.

More specifically, I have noticed that in my application, my flowmeters (rotameters) are dropping over time. As a workaround I have been able to tap them with a wrench every 20 to 30 minutes, this causes the rotameters to rise back up to their original flow rate reading. The fluid in this case is chilled city water.

The device I am looking for must be small and not take too much space.

Thanks!

Welcome to the PF.

If you replace one of the problematic rotameters, does the problem at that location go away? How many of them do you need to replace so that this temporary tapping work-around is no longer needed? :smile:
 
Well I haven't heard of that problem for a long time ! Years ago when most process gauging was mechanical the gauges often got stuck or drifted away from the true reading and had to be 'reset' by tapping .

As Berkeman suggests solving the actual problem of why your rotameters malfunction is the best way to go .

If you actually want a tapper then the well known solenoid and bell clapper will do what you want . Simple stand alone timer or drive from a nearby PC .

Just for interest - the solenoid and bell clapper in miniature form was used as a decoherer in very early radio receivers .
 
Nidum said:
decoherer in very early radio receivers
I had to look that one up! :smile:
 
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