Osicap Capacitive Sensors
Detection of Insulating Materials Capacitive proximity sensors are ideal for sensing non-metal objects or for level control of fluids and granular material.
Adjustment can be used to zero out the presence of an object allowing the sensor to sense "through" a bulk material or liquid level.
The operating distance of a capacitive sensor is related to the dielectric constant (εr) of the object material to be detected. The higher the value of εr, the easier the detection of the object will be. The object to be detected through must have a lower εr value.
The threshold level is adjustable via a 20-turn potentiometer located at the rear of the sensor.
Most Common Dielectric Constant Values
Material |
Dielectric
Constant (εr) |
Oil |
2.2 |
Paper |
2 to 4 |
Water |
80 |
Wood (dry) |
2 to 7 |
Wood (wet) |
10 to 30 |
Glass |
3 to 10 |
Plexiglass |
3.2 |
Rubber |
2.5 to 3 |
Sand |
3 |
Salt |
6 |
Flour |
2.5 to 3 |
| 
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