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Catalogue ifm electronic - International short Catalogue 2005

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Proximity switches

Capacitive sensors

U LOI LOI

Capacitive sensors


Dimensions [mm]	Sensing range [mm]	Material	Electrical design	Output function	Ub [V]	f [Hz]	Connection	Order no.

Threaded tubular plastic housing, 3-wire, DC PNP
M18/L=84	8 nf	plastic	3-wire	no	10...36 DC	50	cable, 2 m	KG5043
M18/L= 110	8 nf	plastic	3-wire	no	10...36 DC	50	terminal block	KG5041
M30 / L = 81	15 nf	plastic	3-wire	no	10...36 DC	40	cable, 2 m	KI5002
M30 / L = 81	15 nf	plastic	3-wire	nc	10...36 DC	40	cable, 2 m	KI5001
M30 / L = 92	15 nf	plastic	3-wire	no / nc	10...36 DC	40	DIN 43650 conn.	KI5038
M30/L= 125	15 nf	plastic	3-wire	no / nc	10...55 DC	40	terminal block	KI5023
Threaded tubular plastic housing, 3-wire, DC NPN
M18/L=84	8 nf	plastic	3-wire	no	10...36 DC	50	cable, 2 m	KG5045
M30 / L = 81	15 nf	plastic	3-wire	no	10...36 DC	40	cable, 2 m	KI5015
Threaded tubular plastic housing, 2-wire, DC
M18/L=84	8 nf	plastic	2-wire	no / nc	10...55 DC	50	cable, 2 m	KG5047
M18 /L= 110	8 nf	plastic	2-wire	no / nc	10...55 DC	50	terminal block	KG5040
Threaded tubular plastic housing, 2-wire, AC/DC
M18/L=84	8 nf	plastic	2-wire	no	20...250	25 / 50	cable, 2 m	KG0009
M18 /L= 110	8 nf	plastic	2-wire	no / nc	20...250	25 / 50	terminal block	KG0008
M30 / L = 81	15 nf	plastic	2-wire	no	20...250	25 / 40	cable, 2 m	KI0016
M30 / L = 81	15 nf	plastic	2-wire	nc	20...250	25 / 40	cable, 2 m	KI0020
M30 / L = 92	15 nf	plastic	2-wire	no / nc	20...250	25 / 40	DIN 43650 conn.	KI0040
M30/L= 125	15 nf	plastic	2-wire	no / nc	20...250	25 / 40	terminal block	KI0024
Smooth tubular plastic housing, 3-wire, DC PNP
0 34 / L = 81	20 nf	plastic	3-wire	no	10...36 DC	40	cable, 2 m	KB5004
0 34 / L = 81	20 nf	plastic	3-wire	nc	10...36 DC	40	cable, 2 m	KB5002
Smooth tubular plastic housing, 3-wire, DC NPN
0 34 / L = 81	20 nf	plastic	3-wire	no	10...36 DC	40	cable, 2 m	KB5001
0 34 / L = 81	20 nf	plastic	3-wire	nc	10...36 DC	40	cable, 2 m	KB5003
Smooth tubular plastic housing, 2-wire, AC/DC
0 34 / L = 81	20 nf	plastic	2-wire	no	20...250	25 / 40	cable, 2 m	KB0025
0 34 / L = 81	20 nf	plastic	2-wire	nc	20...250	25 / 40	cable, 2 m	KB0029
Rectangular plastic housing, 3-wire, DC PNP
120 x 80 x 30	60 nf	plastic	3-wire	no	10...36 DC	10	cable, 2 m	KD5022
105 x 80 x 40	60 nf	plastic	3-wire	no / nc	10...36 DC	10	cable, 2 m	KD5018
Rectangular plastic housing, 2-wire, AC/DC
120 x 80 x 30	60 nf	plastic	2-wire	no	20...250	10	cable, 2 m	KD0012
105 x 80 x 40	60 nf	plastic	2-wire	no / nc	20...250	10	terminals	KD0009
Rectangular plastic housing, 3-wire, DC PNP, function check output
78 x 36 x 10	12 f	plastic	3-wire	no / nc	10...36 DC	40	cable, 2 m	KW5001
78 x 36 x 10	12 f	plastic	3-wire	no / nc	10...36 DC	40	pigtail with M12	KW5005

High operational reliability due to increased noise immunity.

Adjustable sensing range up to

15 mm by means of a potentiometer.

Resistant plastic housing for various applications.

Different connection options using cable, connector or terminals.

Types with programmable output function available.

Introduction

Capacitive proximity switches are used for the non-contact detection of any objects. In contrast to inductive switches, which only detect metallic objects, capacitive sensors can also detect non-metallic materials.

Typical applications are in the wood, paper, glass, plastic, food and chemical industries. Capacitive sensors for example monitor that the contents of a cardboard box are complete or check the presence of the non-metallic caps.

Operating principle

The capacitance between the active industrial electrode of the sensor and the electrical earth potential is measured. An approaching object influences the electrical alternating field between these two "capacitor plates". This applies to metallic and non-metallic objects.

In principle, capacitive sensors work with an RC oscillator. A very small change in capacitance is enough to influence the oscillation amplitude. The evaluation electronics converts this into a switched signal. The sensitivity can be set with a potentiometer.

Increased noise immunity

When detecting objects very small changes in capacitance of 0.02 pF (with a basic capacitance of the electrode of 0.2 pF!) must be reliably converted into useful switched signals. This makes high requirements for the electronics as the circuit and design-related parasitic basic capacitances (e.g. conductive tracks, input capacitances of the components) can be much higher thus making a precise capacitance measurement much more difficult.

ifm electronic therefore developed a future-oriented solution to this problem. A new sensor circuit effectively avoids the indicated problems of the RC oscillator with an acceptable level of input. The new circuit concept achieves much better values with respect to all relevant noise parameters.

Special attention was given to very common noise sources in practice (frequency inverters, switched-mode power supplies manufacturer, stepper-motor controllers,

etc.).

Not only metal: Capacitive sensors detect almost all materials, here for example a log in a saw mill.

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