D-190
Capacitive Sensors
Precautions
Design
Sensing Object Material
E2K-F can detect almost any type of object. The sensing dis-
tance of E2K-F, however, will vary with the electrical charac-
teristics of the object, such as the conductance and
inductance of the object, as well as the water content and ca-
pacity of the object. The maximum sensing distance of E2K-F
will be available if the object is made of grounded metal.
There are objects that cannot be detected indirectly. There-
fore test E2K-F in a trial operation with the objects before us-
ing E2K-F in actual applications.
Effects of Surrounding Metal
Separate E2K-F from ambient metals as shown below.
Mutual Interference
If installing more than one E2K-F face to face or side by side,
separate them as shown below.
Effect of High-frequency Electro-magnetic Field
E2K-F may malfunction if an ultrasonic washer, high-frequen-
cy generator, transceiver, or inverter are nearby.
For a typical measure, refer to the "Noise" with Common pre-
cautions of a photoelectric sensor in Rear B-page.
Wiring Considerations
The characteristics of E2K-F will not change if the cord is ex-
tended. Keep in mind that voltage drops may occur due to the
cord extension, thus, ensure that the total cord length does
not exceed 200 m.
Characteristic data (typical)
Sensing Distance vs. Sensing Object
Grounded metal (t=1)
Ungrounded metal (t=10)
Glass
(t=10)
Phenol resin
(t=10)
10
9
8
7
6
5
4
3
2
1
0
10
20
30
40
50
60
70
80
Sensing object size (mm)
Sensing distance X (mm)
Output Circuit Diagram
Operating
Chart
Output circuit
Yes
No
ON
OFF
ON
OFF
Operation indicator
(red)
Sensing object
Output transistor
(load)
NO Type
100
W
Brown
Brack
Output
Blue
+V
0V
Load
Main
circuit
* 100 mA max. (load current)
*
Correct Use
60mm
Metal object
45mm
30mm
Metal object
Metal object
40mm
50mm
50mm
Close mounting possible
Face-to-face mounting
F502-EN2-04.book Seite 190 Dienstag, 26. Juli 2005 5:48 17
