More on load cell temperature compensation

[clemens]

@GeHan

Next to the cheap half scale load cells I also pursued a cheap single point load cell (Washing Can 100 kg ) and checkt its humidity sensitivity to 20 % RH variation:

Also this load cell show some humidity-drift in the order of 0.5 ppm per 20 % RH variation. Note the load sensitivity is 20 ppm/kg.

@GeHan

The 100 kg Single Point load cell was … first of all cheap (16 Euro) secondly Chinese : type ff634, manufactured by Leinggg and sold by Wascan at amazon: Wascan, gewichtssensor, 100 kg parallelle straalweegschaal sensor voor elektronische weegcellen met hoge precisie voor elektronische weegschaal : Amazon.nl: Zakelijk, industrie & wetenschap

In case the photo on amazon is one from a sold load cell, it seems it is a CZL601AC we have discussed on some places here at hiveeyes:

Along this CZL601AC datasheet the CZL601AC is IP65 rated. You can find empirical temperature and weight data from some user in Beelogger-Waage mit 2 Wägezellen - #26 by clemens and Temperaturkompensation für Waage (Hardware/Firmware) - #7 by Werner