Bernstein Inductive Proximity Sensor

 

Model: I88-U1Z AH (Part No. 602.3103.006)

Product Line: senso-plus / D-31675 Bückeburg

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1. General Description

 

This is a robust inductive proximity sensor from Bernstein AG, part of their senso-plus line. It features a smooth, stainless steel cylindrical housing (likely 18mm diameter) and is designed for non-contact detection of metallic objects.

A key feature of this model is its 2-wire AC/DC capability. It can operate on a wide range of voltages (20-250V AC/DC) and switch loads directly in series, similar to a mechanical switch. It provides a Normally Open (NO) output function.

Key Features 🎯

 

• Wide Voltage Range: Operates on 20 … 250V AC or 20 … 320V DC.

• 2-Wire Technology: Simplifies wiring by connecting in series with the load.

• Robust Construction: Stainless steel housing (likely 1.4305 / AISI 303).

• High Load Capacity: Capable of switching currents up to 350 mA.

• Normally Open (NO): The output closes when a metal target is detected.

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2. Technical Specifications

 

Electrical Data

 

Parameter	Value
Operating Voltage ($U_B$)	20 … 250 V AC / 20 … 320 V DC
Rated Operating Current ($I_e$)	350 mA (AC) / 100 mA (DC – verify if derating applies)
Switching Capacity	100 VA (AC) / 35 W (DC)
Minimum Load Current	4 mA (Required to maintain operation)
Output Function	Normally Open (NO) / Schließer
Output Type	2-Wire AC/DC
Short-Circuit Protection	No (Typical for this specific older/simple 2-wire design, check manual)

Performance & Mechanical Data

 

Parameter	Value
Mounting	Flush (Shielded)
Rated Operating Distance ($S_n$)	5 mm (Typical for M18 flush)
Housing Style	Cylindrical, Smooth (likely M18 x 1 thread or smooth barrel)
Dimensions	Diameter: 18mm, Length: ~60mm (estimate)
Housing Material	Stainless Steel
Connection	PVC Cable, 2-wire
Ambient Temperature	-25 °C … +70 °C
Protection Class	IP67

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3. Wiring (2-Wire AC/DC)

 

This sensor is connected in series with the load.

• Brown (BN): Connect to L1 / + (Voltage Source)

• Blue (BU): Connect to Load (The other side of the load connects to N / –)

Warning: Do not connect the sensor directly to the power supply without a load, as this will permanently damage the sensor (short circuit).