When we started looking at how fluid levels are monitored in the field, one pattern kept coming up: the sensor is often part of the problem it’s meant to watch.
The cost of being in the fluid
Many traditional sensors work by sitting in the liquid itself, whether that’s a float, a probe, or a submerged transducer. That design choice comes with baggage:
- Wear. Anything in constant contact with a working fluid is exposed to whatever that fluid carries.
- Seals. Every penetration into a tank or reservoir needs a seal, and every seal is a future leak point.
- Service. Cleaning, recalibrating, or replacing an in-fluid sensor usually means opening the system.
That last point matters more than it seems. In hydraulics, industry estimates put contamination behind roughly 75 to 80 percent of component failures, and opening a system for maintenance is one of the ways contamination gets in. A sensor that needs regular attention can add to the risk it’s supposed to help manage.
Compare the two approaches
Parts sitting in the fluid
Float, probe, or submerged transducer
Exposure to what the fluid carries
Constant contact with dirt, water, and wear particles
Moving parts in the fluid
Floats can stick or wear, especially with vibration
Taking the sensor out of the liquid
Non-contact measurement removes the sensor from the fluid altogether. Nothing is submerged, so there’s nothing to foul, nothing to corrode in the liquid, and one less reason to break a seal. The same principle applies whether the fluid is hydraulic oil on an excavator or wine in a stainless tank.
It’s a simple idea, but it changes the maintenance math: fewer parts that wear, fewer seals to watch, and fewer reasons to open something that works best closed.
That idea sits at the core of what we’re building at Hodgins Holdings. See where it fits.
Sources
- Fluid Power World: Contamination and hydraulic component failures
- Caterpillar: Hydraulic Management (2007, PDF)