Capacitive Sensors

Capacitive Sensors
Capacitive proximity sensors
Overview
cylindrical designs
product family
CFAM 12
CFAM 18
CFBM 20
CFAM 30
CFAK 30
n
n
n
n
n
n
n
4 mm
8 mm
10 mm
15 mm
4 mm
8 mm
15 mm
housing length
60 mm
76 mm
64 mm
78,5 mm
80 mm
71 mm
82 mm
60 mm
64 mm
71 mm
NPN
n
n
n
n
n
n
n
PNP
n
n
n
n
n
n
n
cable
n
n
n
n
n
n
n
connector M12
n
n
brass nickel plated
n
n
n
n
n
n
n
n
PBT
Overview
CFAK 18
nominal sensing distance Sn
shielded
Pot, 270°
n
n
n
Pot, 10 turn
n
n
n
IP 65
IP 65
IP 65
IP 65
IP 65
IP 65
IP 65
151
152
153
154
155
156
157
CFDK 30
CFAH 30
Pot, 18 rev
protection class
Page
cylindrical / rectangular designs
product family
liquid level sensor
CFAK 12P
CFDM 20
n
n
sensor for high temperatures
n
shielded
unshielded
Capacitive proximity sensors
CFAK 12
n
n
n
nominal sensing distance Sn
0,5 mm
5 mm
15 mm
15 mm
housing length
39,5 mm
35 mm
65 mm
75 mm
65 mm
n
n
NPN
PNP
n
cable
n
n
n
n
connector M8
n
connector M12
n
n
n
V2A/PTFE
n
Pot
n
Pot, 18 rev
protection class
Page
148
n
n
brass nickel plated
PBT
n
n
IP 67
IP 65
IP 65
IP 67
159
160
161
163
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n
Design and mode of operation
Theory of operation
RC oscillator
signal conditioning
output stage
M
K
Cs
output
S
The RC oscillator starts up when the sensitive capacitance Cs of the sensing element is
affected by an external object. The internal change in current is detected by an adjustable
trigger which controls the sensor output.
• Proximity to conductive objects
• of non-conductive objects
If an object of conductive material is located
within the sensing distance of the sensor, it
will form two series connected capacitances
with sensor areas S and M. The series connected capacitances are much larger than
the capacitance of the undamped oscillator.
Maximum sensing distance can be achieved
with conductive objects like metals, water
etc..
If a non-conductive object is moved into
the sensor field, the field will be amplified
in relation to the relative permittivity (εr)
of the material to be detected and thus
increase capacitance Cs. As from a relative permittivity of εr = 81 (water), sensing
distances can be achieved that are equivalent to those for conductive materials. The
sensing distance is reduced for materials
with a lower εr.
Relative permittivity (εr)
Air, vacuum
1
Paper
1,2 - 3
Paraffin oil
2,2
PVC
3
Glass
3-5
Wood
2-7
Marble
8,4 - 14
Alcohol
25
Methanol
33,5
Water
81
Sensing distance in relation to εr
100
90
80
70
60
50
40
Close range shielding
30
20
10
0
0
10
20
30
40
50 60
Sr (%)
70
80
90
100
The capacitive sensor responds to all materials whose relative permittivity εr is greater than
1 (air, vacuum). This means that dirt deposits and moisture on the sensor surface are also
detected. In order to avoid this unwanted effect, Baumer sensors have been equipped
with an additional compensating electrode (K).
This electrode is used to generate an electric field close to the sensor surface which counteracts
the main field. A field free area is produced in proximity to the electrode in which objects may be
located without being detected by the sensor. Although this design is a very effective solution to
the problem of unwanted switching it is not completely foolproof.
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149
Capacitive proximity sensors
Material
εr
Cause of change in
capacitance Cs
Introduction
adjusting potentiometer
Mounting
Mounting instructions
shielded (flush) mounting
Capacitive proximity sensors
Introduction
Shielded capacitive sensors may be flushmounted in metal and other materials. They
are especially suited for the detection of
non-conductive target materials, such as
plastics, wood, glass, etc. As compared to
unshielded versions, shielded sensors have
a slightly increased sensitivity to soiling and
condensation on the sensor’s face.
150
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unshielded (non-flush) mounting
When installing unshielded capacitive sensors, they must be mounted such that there
is no interfering material within a certain
perimeter around the active face. This perimeter has a radius of 1,5 x the diameter
of the sensing head. Unshielded capacitive sensors are insensitive to soiling as
well as condensation on the sensing head.
They are especially suited for the detection
of conductive target materials like metals,
water etc.
Capacitive proximity sensors
CFAM 12
Sn = 4 mm
CAPACITIVE
• Sensitivity adjustment via pot
general data
dimension drawings
shielded
nominal sensing distance Sn
4 mm
nominal sensing distance Sn
adjustable
0,5 ... 4 mm
temperature drift
± 15% (+10 ... +70 °C)
sensitivity adjustment
Pot, 270°
40
SW 17
60
76
LED yellow
Pot
LED
LED
10 ... 30 VDC
20 mA
output current
< 200 mA
voltage drop Vd
< 1,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
M12 x 1
connection diagrams
BN (1)
NPN
BK (4)
BU (3)
mechanical data
BN (1)
+VS
Z
output
PNP
BU (3)
0V
+VS
BK (4)
output
Z
0V
cylindrical
housing material
brass nickel plated
dimension
12 mm
Sn = 4 mm
current consumption max.
type
SW 17
Pot
electrical data
voltage supply range +Vs
M12 x 1
CFAM 12
output indicator
M12 x 1
41
mounting type
ambient conditions
operating temperature
-25 ... +75 °C
protection class
IP 65
accessories
ES 14, ES 18, ESW 33S, ESG 34S
order reference
housing length
output circuit
connection types
CFAM 12N1600
60 mm
NPN make function (NO)
cable
CFAM 12N1600/S14
76 mm
NPN make function (NO)
connector M12
CFAM 12N3600
60 mm
NPN break function (NC)
cable
CFAM 12N3600/S14
76 mm
NPN break function (NC)
connector M12
CFAM 12P1600
60 mm
PNP make function (NO)
cable
CFAM 12P1600/S14
76 mm
PNP make function (NO)
connector M12
CFAM 12P3600
60 mm
PNP break function (NC)
cable
CFAM 12P3600/S14
76 mm
PNP break function (NC)
connector M12
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Capacitive proximity sensors
connectors
151
Capacitive proximity sensors
CFAM 18
Sn = 8 mm
CAPACITIVE
• Sensitivity adjustment via pot
general data
dimension drawings
8 mm
nominal sensing distance Sn
adjustable
2 ... 8 mm
temperature drift
± 15% (+10 ... +70 °C)
M18 x 1
Pot, 10 turn
output indicator
LED yellow
SW 24
78,5
SW 24
sensitivity adjustment
M18 x 1
Pot
Pot
LED
LED
electrical data
CFAM 18
Sn = 8 mm
voltage supply range +Vs
10 ... 30 VDC
current consumption max.
20 mA
output current
< 200 mA
voltage drop Vd
< 1,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
M12 x 1
connection diagrams
BN (1)
NPN
BK (4)
BU (3)
mechanical data
type
BN (1)
+VS
Z
output
PNP
BU (3)
0V
brass nickel plated
dimension
18 mm
ambient conditions
operating temperature
-25 ... +75 °C
protection class
IP 65
accessories
Capacitive proximity sensors
ES 14, ES 18, ESW 33S, ESG 34S
order reference
housing length
output circuit
connection types
CFAM 18N1600
64 mm
NPN make function (NO)
cable
CFAM 18N1600/S14
78,5 mm
NPN make function (NO)
connector M12
CFAM 18N3600
64 mm
NPN break function (NC)
cable
CFAM 18N3600/S14
78,5 mm
NPN break function (NC)
connector M12
CFAM 18P1600
64 mm
PNP make function (NO)
cable
CFAM 18P1600/S14
78,5 mm
PNP make function (NO)
connector M12
CFAM 18P3600
64 mm
PNP break function (NC)
cable
CFAM 18P3600/S14
78,5 mm
PNP break function (NC)
connector M12
152
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+VS
BK (4)
cylindrical
housing material
connectors
40
nominal sensing distance Sn
64
shielded
40,5
mounting type
output
Z
0V
Capacitive proximity sensors
CFBM 20
Sn = 10 mm
CAPACITIVE
• Sensitivity adjustment via pot
general data
dimension drawing
shielded
nominal sensing distance Sn
10 mm
nominal sensing distance Sn
adjustable
2 ... 10 mm
temperature drift
± 15% (+10 ... +70 °C)
sensitivity adjustment
Pot, 18 rev
output indicator
LED yellow
ø 20
80
mounting type
electrical data
20 mA
output current
< 200 mA
voltage drop Vd
< 1,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
Pot
LED
connection diagrams
BN (1)
NPN
BK (4)
BU (3)
mechanical data
type
BN (1)
+VS
Z
output
0V
PNP
+VS
BK (4)
BU (3)
output
Z
0V
cylindrical
housing material
brass nickel plated
dimension
20 mm
housing length
80 mm
connection types
cable
Sn = 10 mm
10 ... 30 VDC
current consumption max.
CFBM 20
voltage supply range +Vs
ambient conditions
operating temperature
-25 ... +75 °C
protection class
IP 65
output circuit
CFBM 20N1600
NPN make function (NO)
CFBM 20N3600
NPN break function (NC)
CFBM 20P1600
PNP make function (NO)
CFBM 20P3600
PNP break function (NC)
Capacitive proximity sensors
order reference
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153
Capacitive proximity sensors
CFAM 30
Sn = 15 mm
CAPACITIVE
• Sensitivity adjustment via pot
general data
dimension drawings
nominal sensing distance Sn
adjustable
4 ... 15 mm
temperature drift
± 15% (+10 ... +70 °C)
sensitivity adjustment
Pot, 18 rev
output indicator
LED yellow
M30 x 1,5
M30 x 1,5
58
15 mm
SW 36
71
nominal sensing distance Sn
58
shielded
82
mounting type
SW 36
CFAM 30
voltage supply range +Vs
10 ... 30 VDC
LED
11
Sn = 15 mm
electrical data
current consumption max.
20 mA
Pot
M12 x 1
output current
< 200 mA
voltage drop Vd
< 1,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
Pot
connection diagrams
BN (1)
NPN
BK (4)
BU (3)
mechanical data
type
LED
BN (1)
+VS
Z
output
PNP
BU (3)
0V
cylindrical
housing material
brass nickel plated
dimension
30 mm
ambient conditions
operating temperature
-25 ... +75 °C
protection class
IP 65
accessories
Capacitive proximity sensors
connectors
ES 14, ES 18, ESW 33S, ESG 34S
order reference
housing length
output circuit
connection types
CFAM 30N1600
71 mm
NPN make function (NO)
cable
CFAM 30N1600/S14
82 mm
NPN make function (NO)
connector M12
CFAM 30N3600
71 mm
NPN break function (NC)
cable
CFAM 30N3600/S14
82 mm
NPN break function (NC)
connector M12
CFAM 30P1600
71 mm
PNP make function (NO)
cable
CFAM 30P1600/S14
82 mm
PNP make function (NO)
connector M12
CFAM 30P3600
71 mm
PNP break function (NC)
cable
CFAM 30P3600/S14
82 mm
PNP break function (NC)
connector M12
154
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+VS
BK (4)
output
Z
0V
Capacitive proximity sensors
CFAK 12
Sn = 4 mm
CAPACITIVE
• Sensitivity adjustment via pot
• Completely sealed housing
general data
dimension drawing
shielded
nominal sensing distance Sn
4 mm
nominal sensing distance Sn
adjustable
0,5 ... 4 mm
temperature drift
± 15% (+10 ... +70 °C)
M12 x 1
sensitivity adjustment
Pot, 270°
output indicator
LED yellow
60
SW 17
Pot
LED
electrical data
20 mA
output current
< 200 mA
voltage drop Vd
< 1,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
connection diagrams
BN (1)
NPN
BK (4)
BU (3)
mechanical data
type
BN (1)
+VS
Z
output
0V
PNP
+VS
BK (4)
BU (3)
output
Z
0V
cylindrical
housing material
PBT
dimension
12 mm
housing length
60 mm
connection types
cable
Sn = 4 mm
10 ... 30 VDC
current consumption max.
CFAK 12
voltage supply range +Vs
40
mounting type
ambient conditions
operating temperature
-25 ... +75 °C
protection class
IP 65
output circuit
CFAK 12N1600
NPN make function (NO)
CFAK 12N3600
NPN break function (NC)
CFAK 12P1600
PNP make function (NO)
CFAK 12P3600
PNP break function (NC)
Capacitive proximity sensors
order reference
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155
Capacitive proximity sensors
CFAK 18
Sn = 8 mm
CAPACITIVE
• Sensitivity adjustment via pot
• Completely sealed housing
general data
dimension drawing
mounting type
shielded
nominal sensing distance Sn
8 mm
nominal sensing distance Sn
adjustable
2 ... 8 mm
temperature drift
± 15% (+10 ... +70 °C)
M18 x 1
sensitivity adjustment
Pot, 10 turn
output indicator
LED yellow
64
40
SW 24
Pot
LED
electrical data
CFAK 18
Sn = 8 mm
voltage supply range +Vs
10 ... 30 VDC
current consumption max.
20 mA
output current
< 200 mA
voltage drop Vd
< 1,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
connection diagrams
BN (1)
NPN
BK (4)
BU (3)
mechanical data
type
cylindrical
housing material
PBT
dimension
18 mm
housing length
64 mm
connection types
cable
ambient conditions
operating temperature
-25 ... +75 °C
protection class
IP 65
output circuit
CFAK 18N1600
NPN make function (NO)
CFAK 18N3600
NPN break function (NC)
CFAK 18P1600
PNP make function (NO)
CFAK 18P3600
PNP break function (NC)
Capacitive proximity sensors
order reference
156
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BN (1)
+VS
Z
output
0V
PNP
+VS
BK (4)
BU (3)
output
Z
0V
Capacitive proximity sensors
CFAK 30
Sn = 15 mm
CAPACITIVE
• Sensitivity adjustment via pot
• Completely sealed housing
general data
dimension drawing
nominal sensing distance Sn
15 mm
nominal sensing distance Sn
adjustable
4 ... 15 mm
temperature drift
± 15% (+10 ... +70 °C)
sensitivity adjustment
Pot, 18 rev
output indicator
LED yellow
M30 x 1,5
56
shielded
71
mounting type
SW 36
10 ... 30 VDC
LED
current consumption max.
20 mA
Pot
output current
< 200 mA
voltage drop Vd
< 1,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
connection diagrams
BN (1)
NPN
BK (4)
BU (3)
mechanical data
type
BN (1)
+VS
Z
output
0V
PNP
+VS
BK (4)
BU (3)
output
Z
0V
cylindrical
housing material
PBT
dimension
30 mm
housing length
71 mm
connection types
cable
CFAK 30
voltage supply range +Vs
Sn = 15 mm
electrical data
ambient conditions
operating temperature
-25 ... +75 °C
protection class
IP 65
output circuit
CFAK 30N1600
NPN make function (NO)
CFAK 30N3600
NPN break function (NC)
CFAK 30P1600
PNP make function (NO)
CFAK 30P3600
PNP break function (NC)
Capacitive proximity sensors
order reference
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157
Capacitive fill level sensor
Reliable detection of
liquid levels
Capacitive fill level sensors
Introduction
The new capacitive fill level sensor
for electrically conductive liquids and
aqueous solutions reliably detects
liquid fill levels even under the most
difficult ambient conditions. The
compact M12 x 40 mm device is IP 67
sealed and is available in PBT, PVDF,
PA 12 and PP plastic enclosures. The
availability of various housing materials covers a wide range of fill level
monitoring applications ranging from
the chemical industry to the food processing industry. The non-flush sensor has been specifically designed
so that soiling and condensation on
the sensor’s face do not cause false
triggers. The product, featuring an
EMI immunity far exceeding the
limits specified by the applicable
CE sensor norm, offers an excellent
price to performance ratio. Some of
Baumer's photoelectric, pressure
and ultrasonic products can also be
used as fill level sensors. Please
consult our application engineers or
ask for our special literature.
158
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Capacitive fill level sensors
CFAK 12P
Sn = 0,5 mm
CAPACITIVE
• Completely sealed housing
• Compact design
• Fill level monitoring
general data
dimension drawing
liquid level sensor
mounting type
unshielded
nominal sensing distance Sn
0,5 mm
nominal sensing distance Sn
adjustable
0,25 ... 0,75 mm
temperature drift
± 20%
sensitivity adjustment
no
output indicator
LED yellow
M12 x 1
39,5
special type
SW 17
LED
electrical data
10 ... 30 VDC
current consumption max.
10 mA
output circuit
PNP make function (NO)
output current
< 200 mA
BN (1)
voltage drop Vd
< 2,5 VDC
BK (4)
switching frequency
< 15 Hz
short circuit protection
yes
reverse polarity protection
yes
Sn = 0,5 mm
voltage supply range +Vs
connection diagram
PNP
output
Z
0V
CFAK 12P
BU (3)
+VS
mechanical data
type
cylindrical
housing material
PBT
dimension
12 mm
housing length
39,5 mm
connection types
cable
ambient conditions
operating temperature
0 ... +70 °C
protection class
IP 67
order reference
Capacitive fill level sensors
CFAK 12P1103
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159
Capacitive proximity sensors
CFDM 20
Sn = 5 mm
CAPACITIVE
general data
dimension drawing
shielded
sensitivity adjustment
no
output indicator
4 port LED
20
CFDM 20
Sn = 5 mm
10 ... 30 VDC
current consumption max.
20 mA
output current
< 200 mA
voltage drop Vd
< 1,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
9
electrical data
voltage supply range +Vs
4xLED
M8 x 1
housing material
brass nickel plated
dimension
20 mm
housing length
35 mm
connection types
connector M8
BN (1)
BK (4)
BU (3)
ambient conditions
operating temperature
-25 ... +75 °C
protection class
IP 65
accessories
connectors
ESW 31S, ESG 32S
output circuit
CFDM 20N1500/S35L
NPN make function (NO)
CFDM 20N3500/S35L
NPN break function (NC)
CFDM 20P1500/S35L
PNP make function (NO)
CFDM 20P3500/S35L
PNP break function (NC)
Capacitive proximity sensors
order reference
160
8,9
connection diagrams
NPN
rectangular
6
13
mechanical data
type
12
10
± 15% (+10 ... +70 °C)
35
5 mm
temperature drift
22
nominal sensing distance Sn
3,5
mounting type
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BN (1)
+VS
Z
output
0V
PNP
+VS
BK (4)
BU (3)
output
Z
0V
Capacitive proximity sensors
CFDK 30
Sn = 15 mm
CAPACITIVE
general data
dimension drawings
shielded
nominal sensing distance Sn
15 mm
nominal sensing distance Sn
adjustable
4 ... 15 mm
temperature drift
± 15% (+10 ... +70 °C)
LED
30
30
18,5
34,4
65
65
26
Pot
10
electrical data
4,3
LED yellow
9,3
< 200 mA
voltage drop Vd
< 1,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
11,2
20
20
14,5
14,5
connection diagrams
BN (1)
NPN
BK (4)
BU (3)
mechanical data
BN (1)
+VS
Z
output
PNP
BU (3)
0V
+VS
BK (4)
output
Z
0V
rectangular
housing material
PBT
dimension
30 mm
Sn = 15 mm
20 mA
output current
M12 x 1
CFDK 30
10 ... 30 VDC
current consumption max.
type
LED
34,4
Pot, 18 rev
output indicator
4,3
sensitivity adjustment
voltage supply range +Vs
18,5
Pot
26
mounting type
ambient conditions
operating temperature
-25 ... +75 °C
protection class
IP 65
accessories
ES 14, ES 18, ESW 33S, ESG 34S
order reference
housing length
output circuit
connection types
CFDK 30N1600
65 mm
NPN make function (NO)
cable
CFDK 30N1600/S14
75 mm
NPN make function (NO)
connector M12
CFDK 30N3600
65 mm
NPN break function (NC)
cable
CFDK 30N3600/S14
75 mm
NPN break function (NC)
connector M12
CFDK 30P1600
65 mm
PNP make function (NO)
cable
CFDK 30P1600/S14
75 mm
PNP make function (NO)
connector M12
CFDK 30P3600
65 mm
PNP break function (NC)
cable
CFDK 30P3600/S14
75 mm
PNP break function (NC)
connector M12
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Capacitive proximity sensors
connectors
161
Capacitive high temperature sensor -40...+250 °C
Some like it hot some do not!
Capacitive high temperature sensors
Introduction
Many applications demand process
temperatures of up to +200 °C and
more. These high temperatures spell
disaster for most electronic devices.
Not so for our high temperature
capacitive sensors from the CFAH
series! These sensors are right “at
home“ when things get hot. Target
materials such as liquids, granulates,
pastes and similar substances can
be detected reliably even at very
high ambient temperatures. Since
conventional electronic components cannot stand temperatures of
+100 °C or more over longer periods,
this sensor has simply been “split”
into hot and cold components. The
actual “hot” sensor head, which
can be used at an ambient temperature of -40 to +200 °C (optional up to
+250 °C), is made of chemical-resistant Teflon and stainless steel. The
high temperature sensor CFAH is the
ideal substitute for mechanical sensors in a wide range of applications.
Due to its high chemical resistance, it
can also be used in chemically harsh
environments. This sensor will operate in nearly any environment and not
even break a sweat.
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Capacitive high temperature sensor
CFAH 30
Sn = 15 mm
CAPACITIVE
KAPAZITIV
• High temperature proof to +250 °C
• Resistant against a number of chemicals
• Probe made of stainless steel & teflon (anti-adherence)
general data
dimension drawing
sensor for high temperatures
mounting type
unshielded
output indicator
LED
SW 36
59
Pot
SW 36
65
sensitivity adjustment
M12 x 1
80
4 ... 15 mm
25
15 mm
nominal sensing distance Sn
adjustable
30
nominal sensing distance Sn
Pot
LED
M30 x 1,5
71
special type
electrical data
SW 24
10 ... 35 VDC
current consumption max.
20 mA
output circuit
PNP make function (NO)
output current
< 200 mA
< 2,5 VDC
switching frequency
< 50 Hz
short circuit protection
yes
reverse polarity protection
yes
Teflon cable dia 3,7 mm L = 1 m
Sn = 15 mm
voltage drop Vd
M30 x 1,5
connection diagram
BN (1)
PNP
BU (3)
mechanical data
+VS
BK (4)
output
CFAH 30
30
CFAH
voltage supply range +Vs
Z
0V
processing electronics
type
cylindrique
housing material
brass nickel plated
dimension
30 mm
housing length
71 mm
connection types
connector M12
sensing head
type
cylindrique
housing material
V2A/PTFE
dimension
30 mm
housing length
65 mm
ambient conditions
operating range
-25 ... +75 °C
temperature drift
± 15% (+10 ... +70 °C)
protection class
sensing head
IP 65
operating range
-40 ... +200 °C
(+250 °C on request)
temperature drift
± 0,02 mm/°C
protection class
accessories
IP 67
connectors
ES 14, ES 18, ESW 33A,
ESG 34A
Kapazitiverhigh
Capacitive
Hochtemperatur-Sensoren
temperature sensor
processing electronics
order reference
CFAH 30P1200/S14
www.baumerelectric.com
163
Installation dimensions and accessories
ES 22
ESW 31
32
20,5
Series 20
rectangular
26
23
ESW 33
ES 14
38
28,5
Installation dimensions and accessories
Series 30
rectangular
38
37
Support bracket (2x)
Color code DC
143377
for 20 mm diameter proximity switches
material plastic (PA 6.6. black)
BU
0V
black
BK
output
brown
BN
+VS
45
Test set
Part No. 115437
164
www.baumerelectric.com
31
16
signal
blue
for M5 hexagon
socket
30
short
name
Capacitive sensors
wire
color