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Re: Testing Patient Scales [Re: Neil Porter] #74585 01/10/19 12:41 PM
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Geoff Hannis Online Content
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What tolerances do those august (money-making) bodies allow, Neil? think

And what techniques do they use to weigh the weights before issuing any certificate(s)?

Also, where are test weights tested, and how are they transported etc.?

But anyway (and more importantly), what tolerances are permitted clinically for patient weighing scales?

Bearing in mind that, wherever you are in the world (and as mentioned a few time before), 1 litre of water weighs 1 kg. smile

1 litre of pure water at 4 °C weighs 1 kilogram.


If you don't inspect ... don't expect.
Re: Testing Patient Scales [Re: Geoff Hannis] #74588 02/10/19 3:43 AM
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Weight & Measures, surely you have heard of them, how many people have been conned in the markets due to 'dodgy scales'

All calibration centres must be certified by the regional government offices.

Tolerances are from the manufactures specifications


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Re: Testing Patient Scales [Re: andysang] #74589 02/10/19 6:47 AM
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DaveC in Oz Offline
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We used to send weights for certification every 5 years not annually and I still think that was to much. Once they have been certified, unless you can see that a lump has been knocked off I really don't see the point in re-certification.

Any how, at 5 years our auditors seemed quite content.


Thoughts and information provided on this forum are mine and mine alone and do not necessarily reflect the policy of NSW Health. They may also be complete bollocks!!
Re: Testing Patient Scales [Re: andysang] #74591 02/10/19 12:40 PM
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Neil Porter Offline
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Dave,
It appears that the auditors have been replaced by accreditation assessors, if they allow more time between calibrations and certification renewals they will not make as much money.


If you think hiring professionals is expensive, try hiring amateurs!
Re: Testing Patient Scales [Re: Neil Porter] #74593 02/10/19 3:09 PM
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Geoff Hannis Online Content
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When I asked about "what tolerances do they allow", I was referring to the "accreditation" people. frown

My suspicion is that modern patient weighing scales may be more accurate than the techniques employed by the "accreditation" labs.

In my opinion, nonsense such as this should be challenged whenever and wherever it appears. I believe it to be yet another scam based upon very little clinical need (or possibly none at all).

Newtonian physics should suffice! smile

Meanwhile, what about precision balances such as those found in clinical laboratories and pharmacies ... do the "accreditation" gang poke their noses in there as well? Or do they limit their interests to "low hanging fruit"?


If you don't inspect ... don't expect.
Re: Testing Patient Scales [Re: Neil Porter] #74594 02/10/19 4:43 PM
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Geoff Hannis Online Content
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Originally Posted by Neil Porter

... how many people have been conned in the markets due to 'dodgy scales'


Only once ... at the souk in Jeddah. whistle


If you don't inspect ... don't expect.
Re: Testing Patient Scales [Re: Geoff Hannis] #74644 17/10/19 1:17 PM
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carendo Offline
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..all very well but how to measure exactly 1 litre of water, and also what weight are the vessels holding said water?

Re: Testing Patient Scales [Re: carendo] #74647 17/10/19 6:38 PM
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Geoff Hannis Online Content
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Welcome to the forum, Andre. smile

I'll leave it to you to work out solutions to those questions for yourself.

Be sure to get back to us with your suggestions.


If you don't inspect ... don't expect.
Re: Testing Patient Scales [Re: andysang] #74652 18/10/19 6:57 AM
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Neoteny Offline
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After repairing a set of scales that were out of warranty, and testing them with calibrated weights.

I was 'threatened' with prison by a certain scales supplier.

STILL waiting for the police to knock down my front door............

Re: Testing Patient Scales [Re: Geoff Hannis] #74654 18/10/19 12:42 PM
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carendo Offline
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Thanks Geoff and glad to be here.

A large portion of my work involves weights and measures so was interested to see how you were measuring your water and weighing your vessels as was hoping to learn something, but to respond to your important question.

A clinical set of scales rated at Class III are defined as such in that the measurements taken over time can be used(in conjunction with other factors) to diagnose patients and prescribe drugs, and the tolerances we work to for this class of scale are:

Reading Discrepancy
0-500 Divisions +/- 1 Div
>500-2000 Div +/- 2 Div
>2000 Div +/- 3 Div

As a side note have attached a png showing the tolerances allowed for various classes of weights to help with your Q below...

Originally Posted by Geoff Hannis


What tolerances do those august (money-making) bodies allow, Neil?

But anyway (and more importantly), what tolerances are permitted clinically for patient weighing scales?



.[/size]

Attached Files weights.PNG
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