Pepperl+Fuchs CJ1-12GK-N

Technical Dossier

Product Details And Specifications

Pepperl+Fuchs CJ1 Series Technical Notes

The series operates on the principle of capacitive field disturbance detection, enabling reliable sensing of non-metallic targets including liquids, granulates, powders, and glass — a capability that distinguishes it from inductive sensor families. Its robust IP67/IP68 ingress protection rating and wide operating temperature range make it suitable for outdoor installations and wash-down environments.

The Evolution of CJ1 Architecture

The CJ1 series was introduced by Pepperl+Fuchs as part of its standardized cylindrical sensor platform, sharing the M12 form factor with the inductive NBB and NJ families to allow interchangeable mounting hardware across sensor types. Early CJ1 variants featured fixed sensitivity and analog-compatible discrete outputs. Subsequent generations introduced adjustable sensitivity via external potentiometer, enabling field calibration without sensor replacement — a critical feature for bulk material level detection applications where target dielectric constants vary by batch.

The transition from 2-wire DC to 3-wire DC configurations (NPN/PNP selectable) addressed compatibility requirements across Siemens S7, Allen-Bradley ControlLogix, and Yokogawa CENTUM DCS input card specifications. Later variants incorporated IO-Link communication capability, enabling parameterization, diagnostics, and process value transmission over a single standard cable — aligning the CJ1 platform with Industry 4.0 field device integration standards.

CJ1 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Pepperl+Fuchs CJ1 capacitive proximity sensor series. Models are classified by output type, mounting style, and sensing range.

Capacitive Sensors – Non-Flush, NPN Output

• CJ1-12GK-N: M12 non-flush capacitive sensor, 4 mm range, NPN NO, 10–30 VDC, IP67
• CJ1-12GK-N-Y187: M12 non-flush, NPN NO, 4 mm, extended cable variant, IP67
• CJ1-12GK-N2: M12 non-flush, NPN NC output, 4 mm sensing range, 10–30 VDC
• CJ1-18GK-N: M18 non-flush capacitive sensor, 8 mm range, NPN NO, 10–30 VDC, IP67
• CJ1-18GK-N2: M18 non-flush, NPN NC, 8 mm sensing range, 10–30 VDC
• CJ1-30GK-N: M30 non-flush capacitive sensor, 15 mm range, NPN NO, 10–30 VDC, IP67
• CJ1-30GK-N2: M30 non-flush, NPN NC, 15 mm sensing range, 10–30 VDC

Capacitive Sensors – Non-Flush, PNP Output

• CJ1-12GK-P: M12 non-flush capacitive sensor, 4 mm range, PNP NO, 10–30 VDC, IP67
• CJ1-12GK-P2: M12 non-flush, PNP NC output, 4 mm sensing range, 10–30 VDC
• CJ1-18GK-P: M18 non-flush capacitive sensor, 8 mm range, PNP NO, 10–30 VDC, IP67
• CJ1-18GK-P2: M18 non-flush, PNP NC, 8 mm sensing range, 10–30 VDC
• CJ1-30GK-P: M30 non-flush capacitive sensor, 15 mm range, PNP NO, 10–30 VDC, IP67
• CJ1-30GK-P2: M30 non-flush, PNP NC, 15 mm sensing range, 10–30 VDC

Capacitive Sensors – Flush Mount Variants

• CJ1-12GK-N-Y1: M12 flush-mount capacitive sensor, 2 mm range, NPN NO, 10–30 VDC, IP67
• CJ1-18GK-N-Y1: M18 flush-mount capacitive sensor, 5 mm range, NPN NO, 10–30 VDC, IP67
• CJ1-30GK-N-Y1: M30 flush-mount capacitive sensor, 10 mm range, NPN NO, 10–30 VDC, IP67

Quality Control for the CJ1 Range

Each CJ1 series sensor processed through DriveKNMS undergoes a structured functional verification protocol prior to shipment. Testing procedures are adapted to the specific output configuration and sensing range of each model:

• Supply voltage sweep test across the rated 10–30 VDC operating range to verify stable switching behavior at voltage extremes
• Sensing range verification using calibrated dielectric target (water-equivalent permittivity) at rated distance and 80% of rated distance
• Output state verification for both NO and NC configurations under load
• Leakage current measurement on NPN open-collector outputs to confirm compatibility with low-threshold DCS input cards
• Cable and connector integrity check: continuity, insulation resistance, and M12 connector seating torque
• IP67 seal inspection: housing thread condition, O-ring presence, and potting integrity at cable entry