E8EB
4
Gap Measurement
When checking the gap between the
workpiece and the nozzle as shown in the
illustration, the output of the E8EB varies
with the surface roughness of the work-
piece or the dimensions of the nozzle.
Examples with E8EB-01C (Typical)
Influence of Surface Roughness of
Workpieces
Influence of Nozzle Diameter Influence of Nozzle Length
• The output varies with the surface
roughness of the workpiece even
though the gap is constant.
• The rougher the surface of the work-
piece is, the more noticeable the varia-
tion of output is with a small gap. The
variation rate versus gap change is not
large in such cases.
• The larger the nozzle diameter is, the
larger the variation rate of output versus
gap change is.
• The smaller the nozzle length is, the
larger the variation rate of output versus
gap change is.
Air supply
Workpiece
Gap
Nozzle length
E8EB
Nozzle
diameter
6
5
4
3
2
1
Gap (µm)
50 100 150 200 250
Linear output voltage (V)
1.6-S∇∇∇
25-S∇∇∇
50-S∇
Conditions
Nozzle dia.: 2 mm
Nozzle length: 10 mm
Air pressure: 100 kPa
6
5
4
3
2
1
50 100 150 200 250
2 dia.
1 dia.
3 dia.
Gap (µm)
Conditions
Nozzle dia.: 10 mm
Surface roughness of workpiece:
1.6-S∇∇∇
Air pressure: 100 kPa
Linear output voltage (V)
6
5
4
3
2
1
50 100 150 200 250
20 mm
10 mm
2 mm
Gap (µm)
Conditions
Nozzle dia.: 1 mm
Surface roughness of workpiece:
1.6-S∇∇∇
Air pressure: 100 kPa
Linear output voltage (V)
