Load cells / Sensitivity

A load cell sensitivity is stated in terms of its rated full scale load. An equation for the output would be:

Eout = (Sensitivity/Full scale load) * (Excitation Voltage) * (Applied Force.)

Example Sensitivity = 2mv/V, Full Scale Load = 5 Kg, Excitation Voltage = 10 Volts DC, Applied Load = 2.5 Kg

Eout = (2/5)* 10*2.5

Eout = 10 mV DC

Howard

Thanks Haward for the info.

Do you know if load cells/force sensors can pick up vibrations of up to 1kHz? I can not find in the specs of the cells any info.

Efthimios

Two comments. A Google search on "load cell frequency response" turned up several links to companies who said they make load cells with a high frequency response. Only one mentioned an actual number. That was Honeywell who said their Sensotec Model 11 can have a frequency response up to 58 kilo hertz. Load ranges vary from 150 grams to 1000 lbs. I expect only load cells at the 150 gram end of the range can achieve a 58 kilo hertz frequency response and there is a drop off of the frequency response as the size of the load cell is increased.

Howard

All true. Back when i was using load cells in 100 lbf and 500 lbf full scale i had to deal with 3 kHz signals produced by the mechanical slop in the system. The machine ran as "fast" as

700 rpm (10 hZ). It was a test system trying measure life of a thing called a flex pivot. It also had systems to monitor for and detect the acoustic signatures that notable in one failure mode. Regular stoppages and parts inspections for other failure modes. The actual test run a less common failure mode detection stopped the test for a few weeks.