Vertical deflection of load cell in cheap electronic weighing scales

For a low-weight (say 250g) application in a cheap electronic weighing
scales using a strain gauge load cell, what is the typical maximum
vertical deflection of the weighing pan? I realise that this is a piece
of string question, but I'd like to get a feel for what order of
vertical deflection might be expected: 1mm, 0.1mm, 0.01mm, 0.001mm???
Russ
Reply to
100566.3716
Loading thread data ...
snipped-for-privacy@compuserve.com said the following on 2/13/2006 12:25:
My expensive load cells will deflect maybe 0.002-0.006 inch at rated load. I imagine a cheapy load cell would have a higher deflection.
Lance *****
Reply to
Lance
When my cheap old scales crapped out I pulled them apart (as you do). Rather than load cell based they seemed to be based on measuring capacitance change. Plates about 30mm x 30mm. Folded sheet metal frame, some insulating plastic and spring steel leaves for motion/force movement. Circuit had what looked like IF coils and a oem IC. I guess as plates moved the oscillator freq changed and this was converted into equivalent scale weight. From memory the maximum movement was about 1mm. Plates were set back a little - movement at plates may have been 1/2mm or so.
It was very cheaply made, but lasted quite a few years.
Reply to
Rob

Site Timeline

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.