Hey,
I want to know, if the Load Cell - 200kg, S-Type
https://www.sparkfun.com/products/14282
is able to meassure tensile forces as well as pressure forces. The explanation in this guide
https://learn.sparkfun.com/tutorials/lo … 1578313103
seemed to me like this load cell is able to measure both. But in the description there is nothing written from meassuring tensile forces.
Thanks in advance guys.
Yes, S-beams can measure tension and compression.
However, you might have to recalibrate the instrumentation when changing between the two.
Not always but be aware that you might.
It often depends on the mounting hardware as much as the load cell itself.
Depending on the instrumentation, you might need to reverse the polarity of the signal.
Some devices have a limited range for negative signal voltage.
Hey,
thanks for the quick answer. Indeed, I want to measure pressure and tensile forces alternating during my process without pausing the measurement inbetween.
I want to use the HX771 load cell amplifier and want to connect it directly to a Raspberry Pi. Could you tell me, if this easy mounting is working for measuring tensile and pressure forces without recalibration?
And you wrote that it can depend on the load cell itself. Are there diffeerent type of load cells that are delivered when I order the mentioned one?
The_Questioner:
I want to use the HX771 load cell amplifier and want to connect it directly to a Raspberry Pi. Could you tell me, if this easy mounting is working for measuring tensile and pressure forces without recalibration?
I don’t have any experience with the HX771 but the spec sheet seems to indicate that the input covers the full range positive and negative. Some instruments have a figure like ‘input range: -0.5 to 36 mV.’ Here’s an example: [scale indicator spec sheet. In this example, they give this as 'Analog input signal range: -1 to 5 mV/V. So if you had an S-beam with a 2mV/V response like in your OP, it will only measure to about half capacity in the negative direction.
And you wrote that it can depend on the load cell itself. Are there diffeerent type of load cells that are delivered when I order the mentioned one?
There are some S-beam cells that are specifically tension OR compression. Here are two load cells like this:
I’m unclear on the differences between these two. It could be as simple as wiring differently so that the output always drives positive or the installation of additional hardware like check bolts or overload stops.
The cell offered by Sparkfun claims to be tension and compression.](https://www.minebea-intec.com/en/products/load-cells/vessel-and-silo-scales/tension-load-cell-s-type-pr-6246/)](https://www.minebea-intec.com/en/products/load-cells/vessel-and-silo-scales/compression-s-type-load-cell-pr-6241/)](https://www.averyweigh-tronix.com/globalassets/products/indicators/zm300-series/zm300series_spec_us_500875.pdf)
Hey, thanks for the specific explanation. I think I got on which paramters it depends. I checked my components regarding your advices and think the process I want to establish should work with it.