The Rechner Sensors Model KXA-5-1MINI-B-P-A-1-Z02-Y90 Capacitive Evaluation Amplifier (Item Number: 498503), engineered and manufactured by Rechner Industrie-Elektronik GmbH in Lampertheim, Germany, is a precision electronic signal conditioning module designed to drive and evaluate non-amplified remote capacitive sensing heads (such as the Rechner KXS and KAS series).

Core Function within the Remote Sensing Architecture:
In extreme industrial applications where operating temperatures exceed the thermal limits of onboard semiconductors (+100°C to +250°C), or where geometric restrictions prevent bulky integrated sensors, a remote probe (such as the M8 high-temperature probe KXS-250-M8 Item No. 498001) is placed at the measurement point. The KXA-5-1MINI amplifier (Item No. 498503) remains safely installed in an ambient control enclosure. Connecting via a specialized triaxial cable, it processes high-frequency capacitance shifts and switches a robust PNP solid-state output for PLC automation.

Model Code Architecture Breakdown (498503 / KXA-5-1MINI-B-P-A-1-Z02-Y90):
- KXA: Remote capacitive evaluation amplifier series.
- 5-1MINI: Ultra-compact MINI housing profile featuring oscillator circuitry tuned specifically for sensor probes ranging from 5 mm to 12 mm in diameter (with capability extending to 18 mm).
- B: Industrial block-style housing form factor.
- P: PNP solid-state switching transistor output.
- A: Normally Open (NO / Antivalent) contact function.
- 1: Standard industrial DC operating voltage rating (10 to 35 VDC).
- Z02: Integrated 2-meter flying lead power/output connection cable.
- Y90: Precision triaxial socket connector (Y90 configuration) engineered to match the triaxial plug on Rechner KXS probe cables.

Key Engineering Features & Operational Advantages:
- Optimized for Miniature Remote Probes: Internal oscillator dynamics are matched to small-diameter probes (M5, M8 like Item 498001, M12, M18), guaranteeing maximum dielectric sensitivity and rapid response times without signal drift.
- High-Resolution Multi-Turn Potentiometer: Features an integrated multi-turn potentiometer providing precise adjustment of the switching threshold. It enables fine calibration to detect ultra-low dielectric materials (such as dry powders, plastic granules, and light oils) or tune out vessel sight-glasses.
- Robust 250 mA PNP Output with Full Protection: Provides a switching capacity up to 250 mA, equipped with integrated short-circuit, overload, and reverse polarity protection circuitry.
- Integrated Visual LED Diagnostics: Features a bright yellow LED indicating the instantaneous switching output state, alongside a power indicator to streamline commissioning and field diagnostics.
- Shielded Triaxial Y90 Interface: Incorporates an active guard voltage across the triaxial Y90 connector interface, neutralizing stray cable capacitance and shielding signals against electromagnetic interference from nearby induction heaters or high-power motor drives.

Target Industrial Sectors & Applications:
- Plastics Processing: Paired with KXS probes for polymer pellet level control inside heated vacuum dryers, hopper dryers, and extruder feed throats.
- Packaging & Converting: Liquid level monitoring inside hot-melt adhesive glue pots and dispensing nozzles on high-speed cartoning machines.
- Rubber & Tire Manufacturing: Position detection of hot rubber strips and calender feed verification.
- Chemical & Process Engineering: High-temperature level tracking in laboratory autoclaves, distillation pilot plants, and thermal fluid loops.

• Manufacturer: Rechner Sensors (Rechner Industrie-Elektronik GmbH)
• Country of Origin: 100% Germany (Made in Germany)
• Product Line: KXA Series Remote Capacitive Signal Amplifiers
• Item / Part Number: 498503
• Model Designation: KXA-5-1MINI-B-P-A-1-Z02-Y90
• Compatible Sensor Probes: Rechner KXS / KAS capacitive probes with diameters from ø5 to ø12 mm (extendable to ø18 mm)
• Recommended Probe Pairing: Perfectly pairs with 250°C probe KXS-250-M8/25 (Item No. 498001)
• Operating Supply Voltage: 10 to 35 VDC (Permissible residual ripple max. 10%)
• Switching Output Type: PNP Transistor
• Output Function: Normally Open (NO)
• Maximum Output Load Current: 250 mA
• Output Voltage Drop (at max. load): ≤ 2.0 VDC
• No-Load Current Consumption: Approx. 10 mA
• Maximum Switching Frequency: 50 Hz
• Sensitivity Adjustment: Multi-turn precision potentiometer
• Sensor Connection Interface: Integrated Triaxial Socket (Y90 configuration)
• Power & Output Termination: 2-meter integrated cable (Z02 configuration, 3 x 0.14 mm² / 0.34 mm²)
• Visual Status Indication: Yellow LED indicating output switching state
• Protective Circuitry: Short-circuit protected, reverse polarity protected, overload protected
• Housing Material: Impact-resistant engineering thermoplastic / aluminum alloy
• Ingress Protection Rating: IP67 conforming to EN 60529
• Operating Ambient Temperature Range: -25°C to +70°C (-13°F to +158°F)
• Form Factor: Miniature block-style design for high-density control cabinet or local box mounting
• Regulatory Approvals: CE marked, RoHS compliant, WEEE compliant, ISO 9001 quality certified.