Page 1
12 - 30 V
DC
20 Hz
IEC 60947...
IEC 60947...
IP 67
42
6,5
9,5
3,2
14
M8 x 1
5,7
11,8
15
LEDTeach-In
20
29,5
A
B
RKU 420 Retro-reflective ultrasonic sensor
Dimensioned drawing
en 02-2016/02 50130124
0 … 400 mm
Small retro-reflective ultrasonic sensor in
plastic housing with degree of protection
IP 67
No dead zone on the sensor
Switching behavior largely independent of
surface properties
Reflector distance pre-set to 122mm
Teach-in via teach button or cable
Protection against erroneous operation by
automatically locking teach button
Accessories:
(available separately)
M8 connectors (D M8…)
Ready-made cables (K-D …)
A Active surface
B Green indicator diode
Electrical connection
We reserve the right to make changes • DS_RKU420_en_50130124.fm
Leuze electronic GmbH + Co. KG In der Braike 1 D-73277 Owen Tel. +49 (0) 7021 573-0
info@leuze.com • www.leuze.com
RKU 420… - 02
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Distance x [mm]
Misalignment y [mm]
Typ. response behavior (object 30 x 30mm)
RKU 420
Specifications
Ultrasonic data RKU 420/…
Operating range 0 … 400mm
Reflector distance 100 … 400mm
Reflector size > 30 x 30mm
Sound frequency 290kHz
Repeatability ≤ 1.5mm (relative to the reflector distance)
Temperature drift ≤ 2%/K (relative to the reflector distance)
Timing
Switching frequency 20Hz
Response time ≤ 25ms
Decay time ≤ 25ms
Readiness delay ≤ 200ms
Electrical data
Operating voltage UB
Residual ripple ≤ 10% of U
Open-circuit current ≤ 35mA
Switching output/function …/4NO… pin 4: PNP transistor, make-contact (NO)
Output current ≤ 200mA
Load C
Teach input pin 2: active high
Signal voltage high/low ≥ (U
2)
…/4NC… pin 4: PNP transistor, break-contact (NC)
…/2NO… pin 4: NPN transistor, make-contact (NO)
…/2NC… pin 4: NPN transistor, break-contact (NC)
12 … 30VDC incl. taking into account the residual ripple
max
B
Indicators
Green LED switching state (off = object detected)
Green LED slowly flashing teach event active
Green LED quickly flashing teaching error
Mechanical data
Housing plastic (PE), color: red (RAL 3000)
Active surface plastic (PC)
Standard measurement object 15 x15mm 30 x30 mm 30 x30mm
Fastening through-holes for 2 x M3
Weight ~ 10g
Connection type M8 connector, 4-pin
Environmental data
Ambient temp. (operation/storage) -10°C … +60°C/-40 °C … +85°C
Protective circuit
VDE safety class III
Degree of protection IP 67
Standards applied IEC/EN 60947-5-2
Certifications UL 508
1) Aligned perpendicular to sensor reference axis
2) Observe the safety regulations and installation instructions regarding power supply and wiring;
for UL applications: only for use in "Class 2" circuits acc. to NEC
3) 1=polarity reversal protection, 2=short circuit protection, 3=overload protection for all outputs
3)
1, 2, 3
B
= 10nF, L
-2V)/≤ 2V
2)
1)
max
= 20μH
Tables
10 400
RKU 420/…
1
Scanning range [mm]
Diagrams
RKU 420/…
30
24
18
12
6
0
-6
-12
-18
-24
-30
0 100 200 300 400
x
y2
y1
y2
y1
RKU 420… - 02 2016/02
Remarks
Operate in accordance with
intended use!
This product is not a safety sensor
and is not intended as personnel
protection.
The product may only be put into
operation by competent persons.
Only use the product in accor-
dance with the intended use.
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OUT
On
0
Off
RKU 420
Reflector
Dead zone
Permissible reflector distance =
100 … 400mm
Reflector
Dead zone
Object
Presetting
RKU 420/2NC.2-S8
(part no. 50132082):
Reflector distance 122mm
RKU 420 Retro-reflective ultrasonic sensor
Part number code
RKU 42 0 / 2NC. 2- S8
Operating principle / construction
RKU Retro-reflective ultrasonic sensor
Series
420 Small cubic construction with housing width of 20mm
Output function
4NO PNP transistor, NO contact
4NC PNP transistor, NC contact
2NO NPN transistor, NO contact
2NC NPN transistor, NC contact
Equipment
.2 Teach input
Electrical connection
S8 M8 connector, 4-pin, axial
Order guide
The sensors listed here are preferred types; current information at www.leuze.com.
Design Designation Part no.
Pre-set to reflector distance 122mm RKU 420/2NC.2-S8 50132082
Function
The sensor detects objects from 0mm up to the reflector distance minus the dead zone.
The dead zone is max. 5% of the selected reflector distance.
In the dead zone, the switching behavior of the sensor is not defined.
Without object With object
0
RKU 420
On
OUT
Off
Switching output OUT = not active (Off)
Green LED is on (no object detected)
Leuze electronic GmbH + Co. KG In der Braike 1 D-73277 Owen Tel. +49 (0) 7021 573-0 RKU 420… - 02
info@leuze.com • www.leuze.com
Switching output OUT = active (On)
Green LED is off (object detected)
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UB for approx. 2s,
green LED flashes
UB briefly, ends
teach event; green LED on
Position the
reflector
UB for at least 6s,
LED flashes quickly
RKU 420
Teach-in of the reflector distance
Teach button Teach-in input PIN 2
Activate teach-in
Press the teach button for approx. 2 s until the LED
flashes - then release the button.
Place the reflector at the desired position and conclude the teach event
LED flashes.
If the reflector is at the desired position, briefly press
the teach button again. The teach event ends after 2 s.
The sensor now detects objects that are located in the
sound path between sensor and reflector.
When an object is detected, the green LED is off.
Teaching error
If the reflector is located outside of the operating range during the teach event, a teaching error occurs.
The LED flashes quickly and the switching output is reset to the factory setting (switching point at the max. operating range).
Resetting the sensor to factory setting
Teach button Teach-in input PIN 2
Restoring the standard operating range
Press the teach button for at least 6 s until the LED
flashes quickly - then release the button.
The sensor setting now corresponds to the standard
operating range.
Locking the teach button
The sensor automatically locks the teach button after either 5 min. after power-on or 5min. after the last teach event is ended. A
new teach event is only possible after disconnecting the sensor from voltage.
If the Teach-IN input is not used,
it must be connected to GND!
RKU 420… - 02 2016/02
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