Pepperl+Fuchs UB250-F77-E2-V31 Ultrasonic Sensor

Technical Overview

Miniature ultrasonic sensor with 20-250mm range, IP67, Teach-In function, and PNP NO output for precise object detection and level control.

Key Features

Miniature design
Program input for easy configuration
Degree of protection IP67 for harsh environments
Switching status indicator, yellow LED
PNP, Normally Open (NO) switch output
M8 x 1, 4-pin connector type

Technical Specification Matrix

Parameter	Value
Sensing Range	20 ... 250 mm
Rated Operating Voltage (Ue)	24 V DC
Operating Voltage (UB)	20 ... 30 V DC (ripple 10 %SS)
No-load Supply Current (I0)	≤ 20 mA
Output Type	1 switch output PNP, NO
Rated Operating Current (Ie)	200 mA (short-circuit/overload protected)
Voltage Drop (Ud)	≤ 2 V
Connection Type	M8 x 1 connector, 4-pin
Degree of Protection	IP67
Ambient Temperature	-25 ... 70 °C (-13 ... 158 °F)
Transducer Frequency	approx. 400 kHz
Response Delay	≤ 50 ms
Physical Weight (kg)	0.01
Dimensions L x W x H (cm)	4 x 1.2 x 2.3

Industrial Applications

1. Non-contact Level Detection in Small Tanks

The UB250-F77-E2-V31 can accurately monitor fill levels in small liquid or bulk solid containers within its 20-250mm sensing range. Its IP67 rating ensures reliable operation even in wet or dusty environments common in process industries, while its miniature design allows for integration into compact systems.

Problem Solved

Provides precise, non-contact level monitoring to prevent overflows or dry-run conditions in small process vessels, reducing waste and improving operational safety.

Level sensingNon-contactLiquid levelBulk solidsFill levelIP67

2. Object Presence and Position Control on Conveyor Systems

Utilizing its 20-250mm sensing range and Teach-In function with background suppression, this sensor is ideal for detecting various objects on conveyor belts. The ability to program a specific switching point ensures accurate detection of products while ignoring the conveyor surface itself, making it suitable for sorting, counting, or positioning tasks.

Problem Solved

Enables reliable and versatile detection of objects on conveyor belts, regardless of material color or transparency, improving automation efficiency in material handling and packaging lines.

Object detectionConveyor beltPresence sensingPosition controlTeach-InBackground suppression

3. Material Loop Control for Tensioning Applications

For delicate materials like plastic film, paper, or textiles, the UB250-F77-E2-V31 can be used for non-contact loop control within its 20-250mm range. Its precise detection capability helps maintain consistent material sag, which is critical for tension control and preventing damage during winding or unwinding processes. The miniature size facilitates integration into complex machinery.

Problem Solved

Maintains optimal material tension and prevents tearing or excessive slack by continuously monitoring the material's sag, providing feedback for precise motor control in converting or printing machinery.

Loop controlTension controlMaterial handlingNon-contactSag controlPlastic filmTextiles