Overview
The Rechner KAS-90-32-S is a compact, 2-wire capacitive proximity sensor engineered for versatile AC/DC operation. Operating across the full 20–250V AC/DC range, it provides 20mm sensing distance and includes thyristor digital output capability with NO (normally open) and NC (normally closed) output functions available. The M32 threaded housing (non-flush design) enables straightforward integration into automation frames, machine controls, and motion systems.
Key Features
- Dual voltage operation: 20–250V AC/DC rated, eliminating the need for separate DC-only or AC-only sensors
- Capacitive detection: Detects all materials with dielectric constant εr ≥ 1.5 (plastics, ceramics, liquids, paper, etc.)
- Adjustable sensing distance: Potentiometer-adjustable switching point within the 20mm range
- Direct relay/solenoid drive: Thyristor output can directly activate AC relays, solenoid valves, and conductors without intermediate relays
- Robust construction: Encapsulated with epoxy casting resin; vibration-stable to 30 g (100–2000 Hz, 1 hour)
- Industrial-grade reliability: SMT-assembled with pre-tested components; operating temperature range −25 to +70°C (up to +90°C for brief periods)
Technical Specifications
- Input Voltage: 20–250V AC/DC
- Sensing Distance: 20mm range (adjustable via potentiometer)
- Output Type: Thyristor digital (NO or NC selectable)
- Housing Diameter: M32 × 1.5 (non-flush)
- Housing Material: PA / PPO (plastic composite)
- Connection: 2-wire with 2m PVC cable
- IP Rating: IP67 (dust and water protection)
- Operating Temperature: −25 to +70°C (brief periods to +90°C)
- Vibration Stability: 30 g (100–2000 Hz, 1 hour)
- Mounting: Threaded M32 screw-in design
Typical Applications
- Material level detection and bin monitoring
- Machine cycle control and automation
- Packing and sorting machinery
- Filling systems (liquid, powder, granulate)
- Food and beverage processing equipment
- Plastic injection molding (material detection)
- Conveyor systems and transfer controls
- Hazardous area installations (when rated and approved)
Compatibility & Replacements
Compatible With
- AC relay control circuits (direct activation with thyristor output)
- PLC analog and discrete inputs (230V AC versions)
- Solenoid valve systems
- Industrial automation machinery (standard M32 threading)
- 24V DC and 120V AC control systems (when using appropriate voltage select)
Replaces / Drop-In Replacement For
- Rechner KAS-90 series variants with identical M32 housing and wiring
- Legacy 2-wire AC/DC proximity sensors with same pin configuration
- Verify compatibility with your system integrator before ordering to ensure voltage range and output function (NO/NC) match your application.
Works With
- AC relay circuits and contactor controls
- PLC analog/digital inputs (220V AC industrial standard)
- Solenoid and pneumatic valve systems
- Motor starters and soft-start controllers
- M32 × 1.5 threaded sensor mounts and junction boxes
