Is there any way to remove or decrease draft while using strain gauges?
I assume you mean "drift". Drift = variation in output with no change in load.
The answer is NO. Low cost strain gauges drift. The only way to reduce the drift is to purchase a better quality strain gauge.
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Measure drift over time and compensate?
Strain gauges are scaring beasts. Even the most expensive may have important drift. My hints:
- Define the acceptable drift for your application (0 is not a valid answer!)
- rule out temperature and voltage: you can use a resting strain gauge to compensate the temperature variations, and acquire the exciting voltage/current to cancel out any changes
- DO NOT understimate the adhesive and the mounting process. They are the most important sources of drifting, it's quite hard to mount strain gauges properly
Hi
Can I ask you elaborate a bit "best praksis" mounting, I am building 10 scales for bee hives and are using 4x half bridge cells from GML670 micro load cell (this one has a datasheet, $4 for 4 pcs) and I need all help I can get to make it as good as possible.
My base as per today:
So your goal is to measure a slow increase in weight over a long (2~3 months) period?
This will make minimising drift even more difficult!
Well, 24/7/365 in Norway and it is not 0,0x kg, more like 0,4 kg, from 14 to 100 kg
I have made a skale that is pretty good and stable with not to big temp drift, and now I go for a better load cell than "alibaba" so I think my system will work.
I asked @Mark81 for tip how to mount it as good as possible, to learn more, load cell has been a "nightmare" for me, but I think I have solved it.
M
Unfortunately I have not enough skills to teach you how to place strain gauges, but when I worked in a company that used them, only few specialized technicians were able to mount strain gauges. They attended several courses provided by the manufacturer of the sensors, and only after a quite long training they were able to successfully install the strain gauges, still with a low (but not zero) failure rate.
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Hey Mark81, thanks for the info! While I might not be able to eliminate drift entirely, your point about temperature compensation is great. I'll definitely look into using a dummy strain gauge for that.
Do you have any suggestions on what kind of adhesive to use for mounting the GML670s?
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You should contact Galoce and ask them, in the website they state they are available for customer support for installation.
Hello @duvdujvsrhvgik
Are you still looking for an answer?
I tried this about 6 months ago. The drift goes up and down with no discernable frequency nor magnitude.