Contactor,circuit breaker,sensor,Encoder,PLC,Converter
TURCK uprox+ Square Inductive Proximity Sensor, Part No.: 1625837
Model Code Explanation
| Code Segment | Description |
| NI50U | uprox+ series, rated sensing distance 50 mm, Factor‑1 (nearly identical sensing distance for iron, aluminum and copper) |
| CK40 | Square housing, dimension 65×40×40 mm, sensing face adjustable in 5 directions |
| AP6X2 | 3‑wire DC, PNP Normally‑Open (NO), enhanced output, short‑circuit protection |
| H1141 | M12‑4‑pin male connector |
W/BS4 version: with BS4 mounting bracket, Part No. 1625868
Core Electrical Parameters
Supply Voltage: 1030 VDC
Output: 3wire PNP NormallyOpen (NO)
Rated Sensing Distance Sn: 50 mm (nonflush mounting)
Safe Operating Distance: ≤0.81×Sn
Max. Load Current: 200 mA
Noload Current: ≤15 mA
Switching Frequency: 250 Hz
Protections: Cyclic shortcircuit protection, reversepolarity protection, wirebreak protection
Voltage Drop: ≤1.8 V
Mechanical & Environmental Specifications
Dimensions: 65 × 40 × 40 mm
Housing Material: PBTGF20V0; Sensing Face: PA12GF30
Protection Class: IP68
Operating Temperature: 30 ℃ ~ +85 ℃
Magnetic Field Resistance: 300 mT, resistant to strong magnetic interference
Features: Factor1, consistent sensing distance for all metal types; sensing face with 5 adjustable mounting orientations
Vibration Resistance: 55 Hz /1 mm; Shock Resistance: 30 g /11 ms
M124pin Pin Assignment (Male Connector)
- Brown: DC24V+
- Blue: 0V/GND
- Black: PNP signal output
- Not assigned
Key Features
- Patented multicoil uprox+ technology, Factor1, constant sensing distance for aluminum, copper and iron, independent of target metal material
- Sensing face rotatable in 5 directions for flexible installation
- High resistance to strong magnetic fields, suitable for weldingmachinesurrounding applications
- IP68 rated, resistant to moisture and dust; ideal for logistics, automotive, construction machinery and conveyorline metaldetection applications
Alternative Selection Reference
OEM TURCK Replacements
NPN NormallyOpen Version: NI50UCK40AN6X2H1141
PNP+NPN Dual Output: NI50UCK40VP4X2H1141
With mounting bracket: 1625868 (NI50UCK40AP6X2H1141 W/BS4)
Domestic Compatible Alternatives (Parameter Matching)
Square 40×40 housing, 50 mm Factor1, PNPNO, M12 connector. Key selection criteria: 50 mm sensing distance, Factor1 characteristic, 30~85 ℃ operating temperature, IP68 rating.
Customs Classification Reference
Inductive proximity switch, HScode: 85365000 (Electrical switches), Country of origin: Germany, Weight approx. 120 g.
Common Troubleshooting
- Sensor LED off: Check pins 12 power supply and polarity. Reverse polarity will not destroy the sensor but causes no output.
- Power supplied but no output when metal approaches: Verify target metal material; keep actual working distance ≤40 mm. Keep largesize metal objects away from sensor side faces. Although uprox+ resists predamping, adjacent bulk metal will still attenuate sensing performance.
- Output chattering: Do not exceed 200 mA load current; check powersupply ripple; reduce operating switching speed.
Application Cases for TURCK uprox+ CK40Series Square Sensors (NI50UCK40AP6X2H1141)
Core Advantages: Factor1 uniform metal sensing, 5direction adjustable sensing face, 50 mm long sensing distance, weldingfield magneticfield resistance, IP68, 30~+85 ℃ wide temperature range, M12 quickdisconnect connector. 40×40 square housing, optimized for longrange detection, high installation tolerance, mixedmetaltarget detection and heavyEMIinterference environments.
- Automotive Weldingshop / BIW Production Lines (Typical Highfrequency Working Condition)
Scenario 1: Skidconveyor Position Detection
Purpose: Position confirmation of transport skids, to inform PLC for skid release / locking. Skids are made of mixed carbon steel, aluminum alloy and stainlesssteel materials.
Pain Points: Conventional proximity sensors suffer heavy sensingdistance attenuation for aluminum targets; strong magneticfield interference in welding stations causes false triggering; variable onsite installation space requires multidirection detection capability.
CK40 Advantages: Constant 50 mm sensing distance for iron / aluminum / stainlesssteel via Factor1; weldingmagneticfield immunity; 5way rotatable sensing face without mechanicalbracket modification; long sensing distance absorbs assembly tolerances.
Installation: Mounted on side / bottom of machine frame, nonflush mounting; safe working distance controlled ≤40 mm.
Scenario 2: Toolingfixture & locatingpin Position Feedback
Purpose: Position feedback for robot grippers and locatingpins (retracted / extended status), to prevent collision caused by incomplete fixture positioning.
Note: For heavyweldspatter stations, select variants with WeldGuard antispatter coating. Install protective baffles for standard PBThousing sensors.
- Logistics Warehousing, Stacker Cranes & AGVs
Scenario 1: Stackercrane Fork Limit & Strokeend Detection
Purpose: Zeropoint and upper/lowerlimit detection for fork extension / retraction; forkinposition signal for anticollision protection against racking.
Working Conditions: Lowtemperature warehouse down to 20 ℃; heavy vibration & shock; mixed steelaluminumalloy target profiles.
CK40 Benefits: Operating down to 30 ℃; 30 g shock resistance; 50 mm long sensing distance maintains stable signal despite fork mechanical oscillation; M12 quickconnector simplifies field replacement & maintenance.
Scenario 2: AGV Liftingmechanism Limit & Palletpresence Detection
Purpose: Upperlimit & lowerlimit detection for AGV lifting platforms; palletpresence confirmation on conveyor lines.
Pain Points: Mixed steelpallet / aluminumpallet handling, conventional sensors lose range on aluminum targets; heavy vehiclebody vibration for AGVs.
Selection Note: NI50UCK40AP6X2H1141 (PNPNO), directly compatible with PLC digital input modules.
- Conveyor Lines, Packaging & General Assembly Automation
Scenario: Heavyduty Rollerconveyor Workpiece Arrival & Stoppercylinder Position Feedback
Purpose: Workpiece / totebin arrival detection; extended / retractedposition feedback for stopper cylinders; highspeed counting, workpiece overtravel prevention.
Working Conditions: Coolant splash and heavy dust, IP68 resistance required; mixed iron / aluminum / copper workpieces flowing through line.
Comparison vs Conventional Sensors: Standard inductive sensors show only 3040 % nominal range for aluminum targets; uprox+ CK40 maintains full performance and reduces sparepart SKUs.
- Machine Tools, Stamping Lines & Construction Machinery
Scenario 1: Machinetool Slidetable & Heavyduty Tooling Limit Detection
Purpose: Hardlimit signal for largemachinetool slides; predetection of sheetmetal arrival in stamping lines for moldcrash prevention.
Pain Points: Strong EMI interference from motors & frequency converters; heavy equipment vibration; constrained installationcommissioning space.
Advantages: Builtin shortcircuit, reversepolarity and wirebreak protection; magneticfield immunity; 5direction sensingface adjustment without custommade brackets.
Scenario 2: External Position Feedback for Constructionmachinery Hydraulic Cylinders
Purpose: External limit detection for large hydraulicactuated movingmechanisms, detecting position of cylinder metal stops.
Working Conditions: Outdoor / semioutdoor service, wide temperature swing, raindust exposure. IP68 and widetemperaturerange performance wellsuited.
- Windpower Equipment (Harsh Outdoor Conditions)
Scenario: Pitchmechanism Position Detection & Compartmentdoor Limit in Windturbine Nacelles
Purpose: Camposition signal for pitchcontrol; nacelle safetydoor openclosed detection; position feedback for internal nacelle metal structures.
Working Conditions: Extreme low temperature down to 30 ℃; generatororiginated strong magneticfield interference; high vibration; humid condensingatmosphere.
CK40 Compatibility: Factor1 performance; 30 ℃ lowtemperature capability; EMC / magneticfield immunity; IP68 prevents condensationwater ingress.
- Specialpurpose Equipment: Largescale Amusementride Machinery
Scenario: Locklatch & Mechanicalstop Position Confirmation for Rollercoasters & Largescale Rides
Purpose: Closedlock confirmation for safetybars; mechanical zeropoint detection for rotating mechanisms.
Pain Points: Large installation tolerances, mechanism oscillation during operation requiring ample sensing margin; mixed steelaluminum target components.
Value: 50 mm long sensingdistance provides stable detection even with mechanicalwear and minor bracket deformation.
Selection & Onsite Application Notes for CK40 NI50UCK40AP6X2H1141
- Nonflush mounting is mandatory, do not embed into metal. Safe practical operating distance ≤40 mm (0.81×Sn), avoid operating at full 50 mm nominal distance.
- Adjacent bulk metal causes predamping effect; keep sufficient metalfree clearance alongside sensor side faces.
- Weldspatterexposed environments: StandardCK40 housing does not resist weldspatter accumulation. Install protective baffles or select WeldGuardcoated variants.
- Wiring for M124pin male connector: Pin1 24V brown, Pin2 0V blue, Pin3 PNPoutput black, Pin4 unused.
- Alternative variants:
NPN Version: NI50UCK40AN6X2H1141
PNP/NPNcomplementary Output: NI50UCK40VP4X2H1141
With BS4 mountingbracket: Part No. 1625868
Complete Technical Data of TURCK NI50UCK40AP6X2H1141 (uprox+ CK40 Square Inductive Proximity Sensor)
Part No.: 1625837
Patented uprox+ Factor1: Nearidentical sensing range for iron, aluminum, copper and stainlesssteel; 5direction rotatable sensing face; weldingmagneticfield resistance; IP68 highprotection rating.
- Sensingperformance Parameters
| Item | Value |
| Rated Sensing Distance Sn | 50 mm (non‑flush mounting) |
| Safe Operating Distance | ≤ 0.81×Sn ≈ 40.5 mm (engineering recommendation ≤40 mm) |
| Mounting Type | Non‑flush mounting, partial metal embedding permitted; full embedding forbidden |
| Repeat Accuracy | ≤ 2 % of full scale |
| Hysteresis | 3 ~ 15 % Sn |
| Temperature Drift | ±10 % (‑25℃~+70℃); ±20 % (‑30~‑25℃ / +70~+85℃) |
| Switching Frequency | 250 Hz (0.25 kHz) |
| Characteristic | Factor‑1 uniform‑metal sensing; withstand DC / AC magnetic‑field up to 300 mT |
- Electrical Parameters
| Item | Value |
| Supply Voltage UB | 10 ~ 30 VDC |
| Permissible Ripple | ≤ 10 % UBmax |
| Output Type | 3‑wire DC, PNP Normally‑Open (NO) |
| Max. Load Current Ie | 200 mA |
| No‑load Current | ≤ 15 mA |
| Residual Leakage Current | ≤ 0.1 mA |
| Output Voltage Drop (full‑load Ie) | ≤ 1.8 V |
| Insulation Test Voltage | 0.5 kV |
| Protection Features | Cyclic short‑circuit protection, reverse‑polarity protection, wire‑break protection |
| Electrical Connection | M12×1‑4‑pin male connector (H1141) |
M124pin Assignment
Pin1 Brown: DC24V+
Pin2 Blue: 0V/GND
Pin3 Black: PNP signal output
Pin4 Not assigned
- Mechanical Parameters
| Item | Specification |
| Overall Dimension | 65 × 40 × 40 mm (CK40 square housing) |
| Housing Material | PBT‑GF20‑V0 (main body); Sensing‑face PA12‑GF30 (yellow) |
| Sensing‑face Orientation | 5‑direction adjustable (up / down / left / right / front), no bracket modification required |
| LED Indicator | Multi‑view high‑visibility bicolor LED; power‑on & status indication |
| Weight | Approx. 120 g |
| Country of Origin | DE (Germany) |
- Environmental & Mechanical Endurance
| Item | Specification |
| Ingress Protection | IP68 |
| Operating Ambient Temperature | ‑30 ℃ ~ +85 ℃ |
| Vibration Resistance | 55 Hz, 1 mm amplitude |
| Shock Resistance | 30 g, 11 ms half‑sine wave |
| EMC Immunity | Resistant to welding‑machine‑generated strong magnetic‑fields; compliant with industrial EMC standards |
- Minimum Installation Clearance (Critical for CK40 Series)
Adjacent bulk metal triggers predamping effect, maintain safety gaps:
Sensor sideface to metal wall: ≥ 105 mm
Sidebyside sensortosensor spacing: ≥ 60 mm
Metal object behind sensor: ≥ 240 mm
Version with BS4 mountingbracket: Part No. 1625868 (NI50UCK40AP6X2H1141 W/BS4)
- Main CK40housing Variant Overview
| Model | Output | Part No. | Remarks |
| NI50U‑CK40‑AN6X2‑H1141 | 3‑wire NPN‑NO | 1625840 | NPN output variant |
| NI50U‑CK40‑VP4X2‑H1141 | 4‑wire complementary PNP/NPN | 1538302 | NO+NC dual‑output, supply 10‑65VDC |
| NI50U‑CK40‑IOL6X2‑H1141 | IO‑Link output | 1625871 | IO‑Link v1.1, parameterizable |
| NI40U‑CK40‑AP6X2‑H1141 | PNP‑NO Sn=40 mm | 1623641 | Same housing, 40 mm rated sensing distance |
- Customsclassification Information
Product Category: Inductive proximity switch
Reference HScode: 85365000 (Electrical switches)
- Critical Application Limitations
- Flush metalembedding installation is prohibited. Do not operate at full 50 mm nominal distance; keep practical working distance ≤40 mm.
- For weldspatterexposed locations, standard housing cannot resist weldspatter accumulation. Install protective baffles or select WeldGuardcoated variants.
- Never exceed 200 mA loadcurrent; otherwise cyclic shortcircuit protection will trigger and cause output chattering.
