CD34CNFLFxxx
Capacitive sensor, Foreground Suppression
Main features
•
•
•
•
•
•
•
•
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Compact housing
Supply voltage: 10 to 30 VDC
Output: 100 mA, NPN or PNP preset
Make or break switching function
LED indication for output and power ON
Protection: reverse polarity, short circuit and transients
Cable and pigtail M8 plug versions
Excellent EMC performance
IP65, IP66, IP67, IP68 and IP69K for hose-down
applications
•
cULus
•
Ecolab
Description
The CD34.. capacitive sensor is designed for
detecting water-based (conductive) liquids through
a non-metallic container wall, and it automatically
adapts to various thicknesses of plastic or glass
walls.
The universal mounting brackets allow the sensor
to be fixed on various tubes or containers.
Strong, compact housing with IP69K ratings and
ECOLAB approval for wash-down applications.
The sensor will function out of the box in most
applications, and teach-in capabilities are available
for adapting the sensor to more challenging
applications.
Main functions
•
Detection of water-based fluids inside a container or tube
without direct contact with the fluids.
•
The sensor detects the liquids reliably while compensating
for residue film, moisture or foam build-up from liquids
such as water, milk, body fluids (blood), acid- or alkaline
solutions with conductivity as high as 50 mS/cm inside or
outside the container wall.
•
Flexible and fast universal mounting bracket.
•
The sensing principle detects only the level of the liquids
while ignoring foam, film or build-up that would cause
standard capacitive sensors to detect faultily.
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Carlo Gavazzi Industri A/S
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CD34CNFLFxxx
References
Product selection key
CD34CNFLF
Enter the code option instead of
Code
C
D
34
C
N
F
L
F
Option
-
-
-
-
-
-
-
N
P
O
C
P2
T5
Description
Capacitive sensor
Rectangular housing
Length of housing
Plastic housing
Neutral
Flush mounting
Liquid level
Foreground suppression
NPN
PNP
N.O.
N.C.
2 m PVC Cable
Pigtail PVC
Type selection
Connec-
tion
Output
Code
CD34CNFLFNOP2
CD34CNFLFNCP2
CD34CNFLFPOP2
CD34CNFLFPCP2
CD34CNFLFNOT5
CD34CNFLFNCT5
CD34CNFLFPOT5
CD34CNFLFPCT5
ACD34-MB01
NPN, N.O.
NPN, N.C.
Cable
PNP, N.O.
PNP, N.C.
NPN, N.O.
NPN, N.C.
Pigtail
PNP, N.O.
PNP, N.C.
Mounting bracket
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CD34CNFLFxxx
Structure
B
A
B
A
E
E
E
D
C
C
Fig. 1
Cable
Element
A
B
C
D
E
Fig. 2
Pigtail
Fig. 3
Sensing surface
Component
Function
LED
Green LED: Power ON
LED
Yellow LED: Output
2 M3
Fixing holes for sensor mounting
Sensing surface
Recessed area for cable strips, max. 5 mm wide
Sensing
Accuracy
Temperature drift
Factory settings
Manual teach
Pipes diameter
Out of the box:
wall thickness
≤ 20% (-25°C... +80°C)
≤ 20% (-25°C... +60°C)
Min. Ø 8 mm
Plastic 0.5 - 6 mm (non-conductive plastic wall)
Glass 0.5 - 4 mm (non-conductive glass wall)
Up to 10 mm plastic wall (best case)
With manual setup:
wall thickness
Up to 10 mm glass wall (best case)
Water-based liquids such as water, milk, syrup, honey, milkshakes, lubricates, acids,
alkaline fluids, body fluids and other high-conductive liquids (up to 50 mS)
Detection
Detection liquids
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CD34CNFLFxxx
Features
Power Supply
Rated operational voltage (U
B
)
Ripple (U
rpp
)
No load supply current (I
o
)
Power-ON delay (t
v
)
10 ... 30 VDC (ripple included)
≤ 10%
≤ 13 mA
< 300 ms
Outputs
Output functions
Output switching function
Rated operational current (I
e
)
OFF-state current(I
r
) PNP and NPN
Voltage drop (U
d
)
Protection
Utilization category
Load capacitance max at (U
e
)
NPN or PNP by sensor type
N.O. and N.C by sensor type
≤ 100 mA
50 μA
< 1 .5 V
Short circuit, reverse polarity and transients
Control of resistive loads and
DC-1
solid-state loads with optical
isolation
DC-13
Control of electromagnets
330 nF
Operation diagram
Tv = Power-ON delay
power supply
Target
Break output
(N.C.)
Make output
(N.O.)
ON
Present
ON
ON
Tv
Tv
Response times
Operating frequency (f)
Response times
≤ 10 Hz
≤ 50 ms
≤ 50 ms
OFF-ON (t
ON
)
ON-OFF (t
OFF
)
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CD34CNFLFxxx
Indication
Normal mode
Green LED
OFF
ON
ON
Yellow LED
OFF
OFF
ON
Power
OFF
ON
ON
Output
OFF
OFF
ON
Output short circuit
Green LED
OFF
Yellow LED
Flashes 4Hz
Output
Yellow LED flashes minimum 1 sec.
Teach by wire
Out of the box (Factory settings):
Typically, the sensor can be used without any additional calibration; it is designed to work with plastic tank
walls of approximately 0,5 to 6 mm in thickness and glass walls of approximately 0,5 to 4 mm in thickness. It
is important that the glass or plastic is nonconductive.
Calibration:
If the factory settings are insufficient, the sensor is teachable to either Full or Empty.
Calibration Full:
The sensor switch point is set below the actual detection value to ensure that slight changes in the application
will not affect the sensing performance.
In most applications, the full calibration on a full tank or tube will be sufficient.
In critical applications with large variations in media type and temperature, it can be an advantage to teach the
Full level with approximately 50 % of the active sensing surface covered.
Full calibration procedure:
•Connect teach wire to V+ for 2 - 7 seconds
•The green LED flashes 1 imp. per sec. and the yellow LED is OFF
•After successful calibration, the yellow LED flashes 3 times (with 1 Hz)
Calibration Empty:
The sensor switch point is set above the actual detection value to ensure that slight changes in the application
will not affect the sensing performance.
In most applications, the Empty calibration on an empty tank or tube will be sufficient.
In critical applications with a high amount of residue film, moisture or foam build-up, an Empty calibration can
be performed with the build-up present.
Empty calibration procedure:
•Connect teach wire to V+ for 7 - 12 seconds
•The green LED flashes 1 imp. per sec. and the yellow LED is ON
•After successful calibration, the yellow LED flashes 3 times (with 1 Hz)
Cancel calibration procedure:
•Keep the teach wire connected to V+ for more than 14 seconds to abort teach procedure. The switch points
will remain unchanged.
•The green LED is off and the yellow LED flashes (4 Hz)
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