Flowmeter Problems: Investigating a 12l/min Difference

In summary, the conversation discusses conducting leak testing for a piece of equipment using flowmeters at the inlet and outlet. Despite no apparent leaks, the two flow rates do not match. To troubleshoot, the two calibrated flowmeters are connected together and show a difference of 12 l/min. The conversation raises questions about the accuracy of connecting flowmeters in series.
  • #1
davidgrant23
22
0
Hi there,

I am currently doing leak testing for a piece of equipment. In order to do so I have a flowmeter at the inlet and outlet (of what is essentially a long cylinder) and have air drawn through by a vacuum pump.

Now, the problem is that even with no obvious signs of leaks the two flows did not match. As a result I connected the two calibrated flowmeters (one sapphire float and a tantium float) together with the vacuum pump and compared the two flowrates. There really shouldn't really be any discernible difference between the two as the connections are very secure. However, there is a difference of 12 l/min between them.

Why would there be such a large difference between the two when they are simply connected in series? They have been calibrated by the vendor previously. Are there any inherent problems if you connect flowmeters in series and compare the two flowrates (such as the pressure drop of the upstream flowmeter)?

Cheers,
Dave
 
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  • #2
Thanks for the post! Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
 
  • #3
is it...leaking?
 

Related to Flowmeter Problems: Investigating a 12l/min Difference

1. How do you investigate a 12l/min difference in a flowmeter?

To investigate a 12l/min difference in a flowmeter, you will need to first gather all necessary data, including the flow rate measurements and any relevant information about the flowmeter itself. Then, you can analyze the data to determine the cause of the difference. This may involve checking for any obstructions or malfunctions in the flowmeter, calibrating the flowmeter, or comparing the measurements to a known standard.

2. What could be causing the 12l/min difference in the flowmeter readings?

There are several potential causes for a 12l/min difference in flowmeter readings. It could be due to a faulty or improperly calibrated flowmeter, obstructions in the flow path, changes in the fluid being measured, or errors in the measurement technique. Thoroughly investigating and analyzing the data can help determine the specific cause.

3. How can I ensure accurate flowmeter readings?

To ensure accurate flowmeter readings, it is important to regularly calibrate the flowmeter, check for any obstructions or malfunctions, and use proper measurement techniques. It is also helpful to compare the flowmeter measurements to a known standard or reference measurement.

4. Can the difference in flowmeter readings be fixed?

In most cases, yes, the difference in flowmeter readings can be fixed. Once the cause of the difference is identified, appropriate measures can be taken to address it. This may involve repairing or replacing the flowmeter, removing any obstructions, recalibrating the flowmeter, or adjusting the measurement technique.

5. How can I prevent flowmeter problems in the future?

To prevent flowmeter problems in the future, it is important to regularly maintain and calibrate the flowmeter, use proper measurement techniques, and be aware of any changes in the fluid being measured. It may also be helpful to have backup flowmeters or alternative methods of measuring flow in case of any issues with the primary flowmeter.

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