Keyence EM-038P High-frequency oscillation proximity sensor

The Keyence EM-038P High-frequency Oscillation Proximity Sensor is a compact, inductive proximity sensor designed for precise detection of ferrous metal objects in industrial environments. Here's a detailed breakdown based on official specifications and technical insights:

Core Specifications

Detection Principle: Utilizes high-frequency oscillation technology (1.2 kHz response frequency) to detect metallic targets. This ensures rapid and reliable detection even for small or fast-moving objects .

Detection Range:

Standard: 0.8 mm ±15% (detects iron targets of 5×5 mm size with 1 mm thickness) .

Hysteresis: ≤10% of the detection distance to prevent false triggering .

Output Type: PNP (sinking) output with a maximum load capacity of 200 mA at 30 VDC, ensuring compatibility with most PLCs and control systems .

Power Supply: Operates on 10.8–30 VDC (with ripple ≤10%), offering flexibility in power sourcing .

Design & Construction

Compact Form Factor:

3.8 mm diameter cylindrical housing (shielded type) with stainless steel construction for durability in harsh conditions .

In-cable amplifier integrates the signal processing circuitry directly into the cable, reducing space requirements and external interference .

Environmental Resistance:

IP67 rating ensures protection against dust and temporary submersion (1 m depth for 30 minutes) .

Operating Temperature: -25°C to +80°C (-13°F to 176°F), suitable for extreme industrial environments .

Installation:

Threaded M8×1 design allows flush or non-flush mounting in confined spaces.

Built-in red LED indicator on the cable amplifier for real-time status monitoring .

Performance Features

High-Frequency Oscillation:

The 1.2 kHz frequency enables fast response times, ideal for high-speed production lines or dynamic applications .

Minimizes interference from adjacent sensors when installed in parallel .

Stability:

Temperature compensation ensures ±10% detection accuracy within -10°C to +70°C .

Stainless steel housing resists corrosion and mechanical stress .

Key Differences from EM-038 Series

Feature EM-038P EM-038

Output Type PNP (sinking) NPN (sourcing)

Amplifier Design In-cable integrated Separate amplifier module

Current Consumption 20 mA max. 12 mA max.

Weight ~38 g (including 2m cable) ~36 g (including 2m cable)

Typical Applications

Automotive Manufacturing: Detecting small metal components on conveyor belts.

Packaging Industry: Monitoring the presence of metallic parts in high-speed packaging lines.

Robotics: Precision positioning of robotic arms in confined spaces.

Machine Tools: Tool detection and workpiece alignment in CNC machines.

Technical Notes

Non-Ferrous Metals: While optimized for ferrous metals, the EM-038P can detect non-ferrous targets (e.g., aluminum) with reduced sensitivity .

Cable Compatibility: Uses a 2-meter pre-wired cable with standard M8 connectors. Extended cables (e.g., 5m, 10m) are available as accessories .

Safety: Ensure proper grounding to prevent electromagnetic interference (EMI) .

For detailed installation diagrams and compatibility with Keyence controllers, refer to the official datasheet .