It was reported that the sensor melted and started on fire when charging.The sensor was returned for investigation.Engineering evaluation found the outer case was severely melted in the area of the usb voltage contact.Corrosion was identified between contact pins on the analog pcb, this most likely caused a fault that resulted in a melt event.Liquid ingress most likely caused the extensive corrosion.Based on engineering evaluation, the reported event was confirmed.A definitive root cause could not be confirmed, but the most probable root cause is user error.The user should insert the sensor properly into the patch, not submerge in water, not expose to water when configured without the patch, and not use an extension cord.
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