Water Level Sensors: Strange Behavior?

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SUMMARY

The discussion focuses on the strange behavior of capacitive level sensors, specifically the MKM-M8-001-STD model, which fail to detect fluid at certain points but resume functionality after being left alone for a few days. Potential causes for this issue include mechanical strain, over-tightening, manufacturing defects, or surface contamination. The unclear specifications regarding the 'switching distance' measurement in the datasheet may also contribute to the problem. Additionally, the original manufacturer appears to be facing financial difficulties, prompting the need for alternative sensor solutions.

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  • Understanding of capacitive level sensors and their operational principles.
  • Familiarity with sensor datasheets and specifications.
  • Knowledge of potential mechanical issues affecting sensor performance.
  • Experience with troubleshooting electronic components in fluid sensing applications.
NEXT STEPS
  • Research alternative capacitive level sensors suitable for water level detection.
  • Investigate the impact of mechanical strain and over-tightening on sensor performance.
  • Learn about the importance of sensor switching distance and how to measure it accurately.
  • Explore best practices for maintaining and cleaning capacitive sensors to prevent contamination.
USEFUL FOR

Engineers, technicians, and hobbyists involved in fluid sensing applications, particularly those using capacitive level sensors for water detection and troubleshooting sensor performance issues.

Kaly
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HI All,

Has anyone experienced strange behavior with capacitive level sensor? They fail (not detecting fluid) at certain point and after leaving them alone for couple of days start working?
 
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Kaly said:
HI All,

Has anyone experienced strange behavior with capacitive level sensor? They fail (not detecting fluid) at certain point and after leaving them alone for couple of days start working?
Can you provide a lot more details? Part numbers, datasheets, diagrams of the setups, schematics of the associated electronics, etc.? Thanks.
 
Yes. please see attached image for specs for the sensor I am talking about.
 

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Kaly said:
They fail (not detecting fluid) at certain point and after leaving them alone for couple of days start working?
If "leaving them alone for a few days" means they are left dry, then they are probably leaking. Possibly due to mechanical strain, over-tightening, or manufacturing defect. Or maybe it is surface contamination.

The data sheet is not clear where or how the 'switching distance' is measured, 0.5mm from where? Could that be part of the problem?
 
These sensors are being used for water level sensing, yes?
What appears to be an identical sensor found in a Google image search is titled a "Tintensensor" (ink sensor).

Is this clean, potable water? Is the probe end in direct contact with the water? What is the sensing application?
Tom.G said:
The data sheet is not clear where or how the 'switching distance' is measured, 0.5mm from where? Could that be part of the problem?
I'm thinking the question @Tom.G posed will be the key to explaining odd sensor behavior.

While attempting to find additional information on the MKM-M8-001-STD sensor shown in the spec sheet, learned that the www.sensorwelt.de site is no longer active, and the company appears to be in financial trouble. It may be time to begin looking for a replacement from a different manufacturer.
 
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