Protection class IP68

Sensors with strain gauges are particularly sensitive to moisture and water. The reason for this is that the smallest resistance changes are measured. The sensor is damaged by moisture on the measuring grid or by reducing the insulation between the connecting cables and the sensor housing.

Force sensors - and especially 3D and force-torque sensors - can only be used with significant disadvantages, e.g. be protected with the aid of O-rings or welded or glued protective covers, because these elements exert a high force. Force sensors for small forces are particularly affected by additional protective covers.

Nevertheless, in individual cases it may be necessary to use a force sensor briefly under water. It is important to select the sensor skilfully: A sensor with a large surface area and an open design can be relatively well protected against moisture, because the paths up to the strain gage or up to the solder joints. This ensures that the function is maintained for as long as possible (KD140). An anodized surface protects against corrosion.

Closed constructions have the risk of moisture penetrating and the sealing compound coming into contact with water in the long term.



Short submersion

Individual water splashes or humidity do not require protection class IP68 or IP67. Protection class IP65 is usually sufficient. Short immersion does not normally damage the open sensors KD24s, KD40s, KD140.

Large area - Good protection

High degree of protection and minimum forces are conflicting requirements. Large area coverage can provide long-term protection even in salt water.

In general, an anodised surface or stainless steel finish is preferable for use in salt water.