Required platform for scales (a weighty matter?)

A

Asherlee

#1
We are about to commence peformance and accuracy testing of the experimental protoypes of our infusion pumps. The applicable standard is IEC 60601-2-24.

We have purchased sensitive, calibrated electronic scales in order to carry out the above testing.

Question: Is there any requirement (in a standard) concerning the table or basis on which the scale is located in order to ensure that the scale is standing 100% horizontal and straight?

For example, maybe the top of table must be made of granite or marble in order to ensure that the surface is “solid” and does not move, or will not vibrate if the table is accidentally pushed.

Thanks for the input.

Asherlee
 
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W

W. de Jong

#2
Hi Asherlee,

I can't think of such a standard, most likely to me seems that the working environment should enable a valid result of the calibration.
Why don't you contact the supplier of the scale?

Kind regards
 

Jim Wynne

Staff member
Admin
#3
Asherlee said:
We are about to commence peformance and accuracy testing of the experimental protoypes of our infusion pumps. The applicable standard is IEC 60601-2-24.

We have purchased sensitive, calibrated electronic scales in order to carry out the above testing.

Question: Is there any requirement (in a standard) concerning the table or basis on which the scale is located in order to ensure that the scale is standing 100% horizontal and straight?

For example, maybe the top of table must be made of granite or marble in order to ensure that the surface is “solid” and does not move, or will not vibrate if the table is accidentally pushed.

Thanks for the input.

Asherlee
Like W. DeJong, I don't know of any standard. The things you're concerned about (vibration, squareness to the supporting surface, etc.) are potential contributors to uncertainty and error, and as such must be determined individually in each application. You can design an experiment to test the scales under different conditions to determine how supporting the scales might affect test results.
 
C

Craig H.

#4
The answers so far are good. You mentioned using marble or granite. There is another alternative if you decide to go that route. If you contact a cement mixing company in your area, you might find that they make concrete table tops, often out of the concrete left over after a run. The ones I have seen are about 6" thick. Supported at each end by stacked cinder blocks they are rock solid, and should be much cheaper than natural stone. Of course if the floor they are sitting on vibrates, well, good luck.
 

Hershal

Metrologist-Auditor
Staff member
Super Moderator
#5
No requirement that I am aware of either.....

Granite is a good choice, though I suggest making sure it is a AA as opposed to A or B.....that is because of the use that you suggest it will receive.

You may also consider one of the manufactured tables made from aluminum or similar.....one company I know that produces them is Newport www.newport.com

Hope that helps.

Hershal
 
K

Kevin H

#6
Asherlee, I'd tend to disagree a bit with the prior comments. I'm not familiar with the standard you mentioned, or the required or inherent accuracy of the scales in question. I am somewhat familiar with weighing requirements, including those for some precise laboratory measurements. Depending on your requirements mounting may be critical - smooth level surface (as Hershal suggests via the granite mounting plate. Ensuring freedom from vibration may be critical as well, I've seen lab scales fluctuate depending on which way a fan or air conditioner was blowing. I'd contact the manufacturer of your scales and check what their recommendation is and follow it to ensure the maximum accuracy. Good luck with your project.
 

Jim Wynne

Staff member
Admin
#7
Kevin H said:
Asherlee, I'd tend to disagree a bit with the prior comments.
Suggestions thus far:
1) Contact the manufacturer
2) Experiment to determine specialized needs
3) Concrete might be a cheaper alternative
4) AA granite plate or manufactured table

Which do you disagree with?
 
A

Asherlee

#9
To all those who replied,

Thanks a lot for your input and for sharing your ideas.
The manufacturer requires the scales to be horizontal and free of vibration, but leaves it to you to implement this as you see fit.

As we all live in the "real world", we know that budget also plays a role in the choices that we make, hopefully not at the expense of quality. My first choice is a granite table.

Regards,

Asher
 
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