Datasheet

Reflex ultrasonic sensor UBR250-F77-E3-V31
2
Release date: 2016-04-29 13:59 Date of issue: 2016-04-29 233262_eng.xml
Germany: [phone]Pepperl+Fuchs Group
Refer to “General Notes Relating to Pepperl+Fuchs Product Information”.
USA: [phone] Singapore: [phone]
www.pepperl-fuchs.com [e-mail] [e-mail]
[e-mail]
Description of Sensor Function
The ultrasonic sensor works like a retroreflective sensor. It transmits ultrasonic packages in
quick succession and responds to their reflection off a reference object at a defined distance.
The distance T to the reference object can be taught in. The sensor has a switch output. This
output switches if the reference object is not detected, which happens when another object is
located between the sensor and the reference object. The limit of the switching range is de-
rived as follows: T - 5 %.
Notes
- The distance T of the reference object must not be changed during operation. If the distance
T changes, it will have to be taught-in again.
- The reference object must not be removed during operation.
Teach-In the Distance to the Reference Object
Proceed as follows to teach in the distance T to the reference object:
1. Connect the sensor and turn on the operating voltage.
2. Place the reference object at the required distance.
3. Connect the teach-in input (ET) to -U
B
. This can be done using the pushbutton or the con-
troller.
The LED will start flashing after 3 seconds to indicate that the sensor is ready to start the
teach-in process
(*)
.
4. Disconnect the teach-in input (ET) with -U
B
. The distance T to the reference object has now
been taught in
(*)
.
(*) If no object is detected within the sensing range of the sensor, the sensor will start flash-
ing at a faster rate. The switching point remains unchanged.
Switching characteristics and display LED
" = Object position
Safety Note
The use of this device in applications, where the safety of persons depends from the devices func-
tion, is not allowed!
Dimensions
12
3.2
23
3.2
ø3.2
322
25
3 14
17
M8 x 1
189
31
Sensing range Output LED
Adjustment range
Switching area 5%
of
T
Reference
object
(position T)
+U
B
On
" -U
B
Off
" -U
B
Off