The **KUS-E1-R** is a specialized electronic component primarily used as a **Liquid Level Sensor** (or Fuel/Water Level Sender). It is commonly found in marine, automotive, and industrial generator applications. Below is a detailed breakdown of its electronic specifications and functions. ### 1. Technical Specifications The device operates on the principle of **magnetic reed switch technology**, which ensures durability and resistance to vibration. | Parameter | Specification | | :--- | :--- | | **Operational Principle** | Magnetic Reed Switch (Discrete steps) | | **Output Signal (Resistance)** | 0–190 $\Omega$ (European Standard) | | **Input Voltage** | 12V / 24V DC compatible | | **Rated Power** | 125 mW | | **Precision Range** | 10mm to 40mm (depending on stem length) | | **Operating Temperature** | -40°C to +85°C | | **Material** | SUS316 Stainless Steel (Corrosion resistant) | --- ### 2. Core Electronic Components The KUS-E1-R consists of three main electronic/mechanical sections: #### A. The Internal Reed Switch Array Inside the stainless steel tube, there is a PCB (Printed Circuit Board) populated with a series of **Reed Switches** and **Resistors**. * **Function:** As the float moves, its internal magnet closes specific switches. * **Electronic Logic:** Each switch corresponds to a specific resistance value in a series, changing the total Ohms seen by the gauge. #### B. The Magnetic Float While it appears mechanical, the float contains a permanent magnet. This acts as the "trigger" for the internal circuitry without requiring physical contact (contactless sensing), which prevents electrical arcing and wear. #### C. Wiring Configuration The unit typically uses a standard 2-wire system: * **Blue Wire:** Ground (Negative) * **Brown Wire:** Signal (Resistance output to the gauge) --- ### 3. Resistance Curve (0-190 $\Omega$) The "R" in the model name often signifies the specific resistance range. For the KUS-E1-R, it follows the **European Standard**: | Level Status | Resistance Value | | :--- | :--- | | **Empty (0%)** | 0 $\Omega$ | | **Mid (50%)** | 95 $\Omega$ | | **Full (100%)** | 190 $\Omega$ | *Note: Ensure your display gauge is also rated for 0-190 $\Omega$. If using an American standard gauge (240-33 $\Omega$), the reading will be inverted or incorrect.* --- ### 4. Installation Wiring Example ```cpp // Schematic representation of the circuit [Battery +] ---- [Gauge +] [Gauge Signal] --(Brown Wire)-- [KUS-E1-R Sender] [Battery -] ----(Blue Wire)---- [KUS-E1-R Sender] ```