## IA0204-R18KA Technical Overview The **IA0204-R18KA** is a high-precision, sub-miniature **Inductive Proximity Sensor** typically manufactured by Carlo Gavazzi. These sensors are designed for non-contact detection of metallic objects in space-constrained industrial environments. --- ### 1. Key Specifications The following table highlights the primary electrical and physical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Housing Diameter** | Ø 4.0 mm (Sub-miniature) | | **Sensing Distance ($S_n$)** | 0.8 mm | | **Installation Type** | Flush (Shielded) | | **Output Type** | NAMUR (Analog current signal) | | **Operating Voltage** | 7 - 9 VDC (Nominal 8.2 VDC) | | **Switching Frequency** | 2000 Hz | | **Housing Material** | Stainless Steel (AISI 303) | | **Protection Degree** | IP 67 | | **Connection** | 2-meter PVC Cable | --- ### 2. Operational Electronic Details #### A. NAMUR Output Logic Unlike standard PNP or NPN sensors that act as simple switches, the IA0204-R18KA utilizes a **NAMUR output**. - **State 1 (No Target):** The sensor consumes high current (> 2.2 mA). - **State 2 (Target Detected):** The sensor consumes low current (< 1.0 mA). - **Safety:** This 2-wire interface is designed for use in intrinsically safe areas when paired with a galvanic isolator or a switching amplifier. #### B. The Inductive Principle The device contains an internal LC oscillating circuit. 1. The oscillator creates an electromagnetic field at the sensing face. 2. When a metallic object enters this field, **Eddy currents** are induced in the object. 3. This causes a loss of energy in the oscillator, which the internal electronics detect as a change in current consumption. #### C. Flush Mounting The "R18" in the part number indicates a short, stainless steel housing designed for **Flush mounting**. This means the sensor can be embedded directly into a metal mounting base up to its sensing face without causing a false trigger. --- ### 3. Connection Diagram (General) ```text [ Power Supply +8.2V ] --- (Brown Wire) --- [ IA0204-R18KA ] [ Control System/Amp ] --- (Blue Wire) --- [ Ground/Common ] ``` *Note: Because this is a NAMUR sensor, it must be connected to an amplifier or a PLC input card specifically designed for NAMUR signals to convert the current change into a binary (ON/OFF) signal.* ---