CD22-35AM12 Inductive Proximity Sensor

The CD22-35AM12 is an inductive proximity sensor designed for non-contact detection of metallic objects. With an M12 threaded cylindrical housing, this sensor provides a long sensing distance of 35 mm, making it suitable for position sensing, counting, and presence detection in industrial automation. The sensor operates on a wide 10-30V DC supply and outputs a digital NPN signal.

Technical Specifications

Operating voltage: 10-30V DC (including ripple). Output type: NPN normally open (NO). Maximum load current: 200 mA. Residual voltage: ≤ 2V at 200 mA. Leakage current: ≤ 0.5 mA. Sensing distance: 35 mm (standard target: mild steel, 45x45x1mm). Hysteresis: ≤ 10% of sensing distance. Repeat accuracy: ≤ 1% at 25°C.

Frequency and Response

Switching frequency: 150 Hz. Response time: less than 3 ms for both ON and OFF. The sensor uses a standard inductive oscillator circuit with a compensation coil for temperature stability (drift ≤ 5% over full range).

Mechanical Construction

Housing material: nickel-plated brass. Sensing face: PBT. Thread size: M12 x 1, length 70 mm. Hex nut and lock washer included for panel mounting. The sensor is supplied with a 2-meter PVC cable (3 wires: brown, blue, black) or optional M12 quick-disconnect connector.

Environmental Ratings

Protection class: IP67 (dust-tight, waterproof). Operating temperature: -25°C to +70°C. Storage temperature: -40°C to +80°C. Vibration resistance: 30 g (10-2000 Hz). Shock resistance: 100 g (11 ms half-sine). The sensor is CE and RoHS compliant.

Installation Guidelines

The CD22-35AM12 can be flush-mounted or non-flush mounted. For non-flush mounting, keep at least 3 x sensor diameter (approx 40 mm) clearance from metal surroundings to avoid false triggers. Ensure the sensor face is not scraped by moving targets. Torque for mounting nuts: 10 Nm.

Typical Applications

Used for detecting metal parts on conveyors, monitoring piston position of pneumatic cylinders, counting metal plates, and presence detection in machine tools. The long 35mm range allows sensing through non-metallic barriers or at a safe distance from hot parts.

Electrical Connection

Brown wire: +24V DC (10-30V). Blue wire: 0V. Black wire: output (NPN). When the target is present, the output connects to 0V. Connect a load (max 200mA) between black and +24V. An LED indicator inside the sensor lights up when the output is active.

Conclusion

The CD22-35AM12 inductive sensor offers reliable long-range metal detection in a compact M12 housing. Its robust construction and IP67 rating suit demanding factory automation environments.