Baumer UNDK20P11 Ultrasonic Proximity Sensor

UNDK20P11

1. UNDK: Integrated transmit-receive rectangular ultrasonic sensor serie
2. 20: 20mm housing width, compact block housing
3. PAG: PNP transistor output
4. 11: Standard switching type, fixed measuring range, conector m8, Normalmente abierto (NO) producción

Material No.: 099186

1. Core Electrical Specifications

III. Measuring & Ranging Specifications

Measuring range: 40mm～400mm

Dead zone Sdc: 40milímetros (unstable detection below 40mm)

Precisión de repetición: ＜0.5mm

Resolución: ＜0.3mm

Sound Beam Angle: Standard narrow beam, suitable for narrow stations and adjacent interference suppression

1. Mecánico & Protection Specifications
2. Overall dimension: Rectangular block, 42milímetros (l) × 20mm (W.) × 15mm (t)
3. Material de la carcasa: PA12 engineering plastic; sound transducer head: POM
4. Interfaz eléctrica: M8 4-pin male connector (S35A standard plug)
5. Clase de protección: IP67, dust-proof and splash-proof
6. Temperatura de funcionamiento: -10℃～+60℃
7. Rendimiento antiinterferencias: Resistant to dust, moisture and mist; unaffected by target color, transparency or metal materials
8. Pin Assignment (M8 4Pin)
9. Pin1: Brown → DC24V Positive
10. Pin2: White → Teach-in input
11. Pin3: Blue → 0V GND Negative
12. Pin4: Black → PNP switching output
13. Escenarios de aplicación típicos
14. Maquinaria de embalaje: Material presence detection, carton position confirmation, transparent plastic bottle inspection
15. Logistics Conveying: Workpiece counting, object presence detection, low-level bin warning
16. Lithium Battery / 3C Industry: Small workpiece positioning, thin transparent material detection (for environments where photoelectric sensors fail)
17. carpintería & Textile Industry: Replace photoelectric sensors in dusty environments; stable detection for non-reflective materials

VII. Reference Alternative Models in the Same Series

1. UNDK20N11: Mismas dimensiones & rango de medición, NPN Normally Open output
2. UNDK20P6914: Analog 4–20mA ranging version (continuous distance signal output)
3. UNDK20P17: Long-range version, 100–1000mm measuring range

VIII. Ventajas del producto

1. Ultra-small 40mm dead zone, compact 20mm block design for limited installation space
2. One-touch Teach key to set switching threshold; no tools required for commissioning
3. Immune to interference from transparent, black and mirror surfaces, superior to photoelectric sensors
4. IP67 industrial protection, compatible with humid and heavily dusty production lines

Baumer UNDK20P11 Ultrasonic Sensor Installation & Manual de operación

Document Version: V1.0 | Applicable Model: UNDK20P11 (Material No. 099186)

Table of Contents

1. Pre-installation Safety Instructions
2. Unpacking & Product Specification Verification
3. Mechanical Installation Specifications (Dimensiones, Brackets, Spacing, Interference Prevention)
4. Electrical Wiring Definition & Wiring Procedures
5. Complete Teach-in Calibration Process
6. Environmental Installation Restrictions & Forbidden Working Conditions
7. Isolation Standards for Side-by-Side / Opposed Multi-sensor Installation
8. Power-on Verification & Solución de problemas
9. Mantenimiento de rutina & Storage Specifications
10. Quick Reference Technical Parameter Table

1 Pre-installation Safety Instructions

1. Disconnect the 24V DC power supply before wiring, disassembly or assembly. Hot plugging/unplugging of M8 connectors is strictly prohibited to avoid breakdown and burnout of output transistors.
2. Only DC 15~30V power supply is permitted; AC power and high-voltage power supply are forbidden.
3. The maximum load current of PNP output is 200mA. A freewheeling diode must be connected in parallel across inductive loads such as solenoid valves and relays (reverse parallel on both ends of the coil).
4. Do not install the sensor at close proximity to strong ultrasonic sound sources (high-pressure washers, ultrasonic welding machines, high-frequency pneumatic nozzles), which will cause false triggering.
5. The housing is made of PA12 plastic. Do not strike the sound-emitting surface with sharp hard objects, and avoid direct spraying of strong acid or strong solvent onto the transducer head.
6. Only suitable for standard indoor industrial environments; a rainproof protective cover is mandatory for outdoor use.

2 Unpacking & Product Verification

2.1 Standard Package List

1 × UNDK20P11 ultrasonic sensor main unit

1 × Short product instruction sheet

2.2 Visual Inspection Items

1. No cracks on housing; no scratches or oil contamination clogging the sound-emitting surface
2. M8 4-pin male plug free of deformation; pins without bending or oxidation
3. Intact side Teach key; transparent red/green LED windows without damage

2.3 Quick Reference Basic Parameters

Measuring range: 40milímetros (dead zone) ~ 400mm (maximum detection distance)

Producción: 3-wire PNP NO (Normalmente abierto)

Ultrasonic frequency: 380kilociclos

Clase de protección: IP67

Temperatura de funcionamiento: -10℃ ~ +60℃

3 Mechanical Installation Specifications

3.1 Dimensiones generales (Unidad: milímetros)

Total length 42 × width 20 × thickness 15, compact block housing.

3.2 Standard Installation Methods

Method A: Aluminum Profile Groove Bracket Mounting (Recomendado)

1. Use plastic or metal snap brackets matched with standard 20mm aluminum profiles to wrap both sides of the sensor body.
2. Tightening torque of fixing screws shall be controlled at 0.4~0.6N·m. Do not compress the housing with excessive force to prevent damage to internal piezoelectric crystals.
3. The sound-emitting surface shall face the measured object vertically; a slight inclination of ±10° is allowed. Excessive tilt will drastically reduce detection stability.

Method B: Sheet Metal Cutout Fixing

1. Cutout dimension: 21mm × 16mm; chamfer and deburr cutout edges.
2. Non-flush mounting of the sensor: The transducer head shall protrude at least 5mm outward from the sheet metal.
3. Sheet metal tightly attached to both sides of the head will reflect ultrasonic waves, resulting in enlarged dead zone and frequent false detection.

3.3 Mandatory Key Installation Distance Requirements

1. Minimum dead zone: The distance between target and transducer head shall not be less than 40mm; targets within 40mm cannot be detected.
2. Maximum effective detection distance: 400milímetros; no signal output beyond this range.
3. No metal brackets, cables or bolts shall be fixed within the 120° sound beam in front of the head to avoid blocking ultrasonic waves.
4. Minimum target width: Stable detection requires target width ≥25mm at a distance of 200mm.

3.4 Environmental Taboos for Single Sensor Installation

Continuous water dripping or direct mist spray above / beside the transducer head is forbidden.

Keep away from fans, air guns and high-pressure blow nozzles (airflow disturbs ultrasonic echoes).

Long-term operation in silicone volatile environments (silicone glue, silicone oil seals) will clog the sound diaphragm.

4 Electrical Wiring Definition & Operación

4.1 M8 4-Pin Male Connector Pinout

4.2 Wiring Procedures

1. Cut off total power and confirm no voltage output from PLC / fuente de alimentación.
2. Connect with standard M8 4-core female cable; cable bending radius ≥ 5 × cable outer diameter.
3. Separate power cables (motor, inverter cables) from sensor signal cables with a spacing ≥100mm to avoid inverter interference.
4. Secure cables with cable ties; reserve 50mm slack at connectors to eliminate long-term tensile stress on plugs.
5. Install freewheeling diodes for inductive loads: Anode of diode connects to load negative terminal, cathode connects to 24V output terminal.

4.3 Requisitos de fuente de alimentación

Ripple voltage ≤10% of rated voltage

It is recommended to add a 1000μF filter capacitor to the switching power supply to suppress industrial grid interference

Do not share the same power circuit with high-power motors

5 Teach-in Calibration Process (Two Modes: Llave / External Wire)

5.1 Single Switch Threshold Setting (Operación estándar)

Método 1: On-body Key Calibration

1. Power on the sensor; green LED lights steadily for standby status.
2. Press and hold the side Teach key for 2 artículos de segunda clase; green LED flashes rapidly.
3. Place the workpiece at the target trigger detection distance.
4. Short-press the Teach key once.
5. Green LED stays lit for 2 artículos de segunda clase, indicating parameter storage complete and commissioning finished.

Metho 2: External Calibration via White Teach Wire (PLC Automatic Calibration Scenarios)

1. Short the white wire to brown 24V positive terminal for 2s; green LED flashes.
2. Place the workpiece at the preset detection distance.
3. Disconnect then instantly re-short the white wire once.
4. Green LED stays steady for 2s to save the threshold value.

5.2 Restore Factory Default Settings

1. Press and hold the Teach key for over 6 artículos de segunda clase / keep the white wire connected to 24V for more than 6 artículos de segunda clase.
2. Red and green LEDs flash alternately.
3. Release the key / disconnect the white wire; factory default measuring range 40~400mm and default switch point are restored automatically.

5.3 LED Indicator Status Description

6 Multi-sensor Installation Isolation Specifications (Mutual Interference Prevention)

6.1 Side-by-Side Same-Direction Mounting (Same Detection Orientation)

Minimum center-to-center distance between two UNDK20 series sensors: ≥120mm

Insufficient spacing causes mutual ultrasonic reflection and continuous false triggering.

6.2 Opposed Face-to-Face Mounting (Heads Facing Each Other)

Vertically stagger the axes of two heads by ≥150mm; direct face-to-face installation is forbidden.

If close opposed layout is mandatory, stagger mounting heights to avoid overlapping sound beams.

6.3 Recommended Layout for Dense Multi-sensor Arrangement

1. Install sensors in staggered high-low layers.
2. Equip each sensor with independent aluminum profile separation baffles (ABS / metal baffles block ultrasonic waves).
3. Split sensors into two groups with staggered power supply timing to avoid interference from simultaneous ultrasonic emission.

7 Power-on Inspection & Troubleshooting Matrix

7.1 No LED Illumination After Power-up

1. Reversed or broken brown/blue power wires
2. Supply voltage lower than 15V
3. Poor crimping of M8 plug pins; re-crimp the cable.

7.2 Yellow LED Steady On Without Target (Activación falsa)

1. Metal brackets or cables block the sound beam in front of the head
2. Insufficient spacing between two sensors causing mutual interference
3. Continuous airflow or mist disturbs ultrasonic echoes
4. Excessively long calibrated distance via Teach-in; re-calibrate the threshold.

7.3 No Signal Output With Workpiece Present (Yellow LED Off)

1. Workpiece distance falls within the 40mm dead zone
2. Overly small workpiece or sound-absorbing material (thick sponge, sound-absorbing foam)
3. Sound diaphragm clogged with dust and oil; wipe and clean thoroughly
4. Overly close Teach-in threshold setting; re-perform Teach calibration.

7.4 Persistent Red Fault Indication

1. Short-circuited output load; disconnect load and re-test
2. Supply voltage exceeds 30V, burning internal circuits
3. Damaged sound diaphragm; sensor replacement required.

8 Environmental Installation Restrictions & Protección

1. Rango de temperatura: -10℃ ~ +60℃. Frost on the head below -10℃ leads to failure; heating shield required.
2. Protección IP67: Tolerates short splashing water; long-term underwater submersion and direct high-pressure water jet flushing of the head are forbidden.
3. Heavy dust conditions (woodworking, cemento, lithium powder): Blow clean the sound diaphragm with dry compressed air monthly.
4. Corrosive mist environments (galvanoplastia, pickling): Use sealed protective covers to isolate acid and alkali fumes.

9 Routine Maintenance Specifications

1. Weekly visual inspection of transducer head surface to remove dust, oil and water stains.
2. Tighten bracket mounting screws monthly to eliminate loosening caused by vibration.
3. Inspect M8 connector cables quarterly for abrasion and cracking.
4. Clean only with dust-free cloth and clean water; soaking the head in alcohol, acetone or thinner is prohibited.

10 Appendix: Parámetros técnicos básicos

11 Installation Acceptance Standards

Three acceptance items must be completed before putting equipment into production after installation:

1. Mechanical Acceptance: No loose brackets, unobstructed transducer heads, compliant spacing for multi-sensor layout.
2. Electrical Acceptance: Correct wiring, no short circuits, freewheeling diodes fully fitted for inductive loads.
3. Functional Acceptance: Repeatedly insert and retract workpieces; stable sensor triggering without missing detection or false detection.