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Repair or throw away?

Repairing instead of throwing away is worth it for the environment. Force sensors and torque sensors in particular are made of high-quality, high-strength steels or aluminum alloys.

The weak points of sensors are usually the connection cables or the strain gauge when it is exposed to moisture or water. During a repair, we remove casting compound and we analyze the structure of the sensor: the number and arrangement of strain gauges, connection resistance, series or parallel connection of strain gauges provide information about how the sensor once worked.

It is not uncommon for error analysis to provide information about structural weak points, possible errors in processing or possible qualitative defects in the materials used.

A repaired sensor gets a second life at ME-Meßsysteme and is often of better quality than it was originally. Because by using high-quality materials, such as connecting cables with PUR sheaths, often suitable for drag chains, by using the best materials for the cover, and by craftsmanship, and last but not least by taking into account previous experiences with the defective sensor, we create added value, while conserving resources.

Sustainability is part of the program at ME-Meßsysteme.

Repairability of sensors

Repair

When is a sensor repairable? An important criterion is that the sensor body is intact and has not been visibly mechanically deformed (plastically deformed).

A common cause of sensor failure is overload. This results in a slight plastic deformation, which is usually not yet visible because it only corresponds to a deformation of, for example, 0.2%. The signal from the force sensor is therefore already outside the measuring range of many display electronics.

With these small mechanical deformations as a result of an overload, the sensor is usually repairable.

Load cycles and fatigue strength

Fatigue limit

Further criteria include the number, amplitude and type of load cycles. The force sensor in laboratory operation is usually exposed to a few load cycles, while a sensor in a railway track or in a production plant is also exposed to 104 to 107 load cycles.

The dimensioning and geometry of the sensor then play a role in assessing reusability.

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