The **6A5-R** is a specific model of an **Electronic Water Level Sensor** or **Floatless Level Switch**, commonly used in industrial automation for controlling pump operations and monitoring fluid levels. --- ### 1. Technical Specifications Below are the typical technical parameters associated with the 6A5-R series: | Feature | Specification | | :--- | :--- | | **Operating Voltage** | 110V / 220V / 380V AC (Model dependent) | | **Contact Rating** | 5A @ 250VAC (Resistive load) | | **Response Time** | Max 80ms (Action) / 160ms (Release) | | **Indicator** | LED Light (Status of relay) | | **Sensitivity** | High sensitivity for conducting liquids | | **Mounting** | DIN Rail or Surface mount (typically 8-pin base) | --- ### 2. Core Electronic Components The 6A5-R functions as a control relay. Its internal architecture consists of the following electronic parts: * **Transformer/Power Supply:** Converts the high-voltage AC input into a low-voltage DC signal used for the sensing circuit and the internal relay coil. * **Electrode Circuitry:** This is the "sensing" part. It sends a low-voltage AC current to the electrodes (probes) placed in the water. * *Note:* It uses AC to prevent **electrolysis** (corrosion) of the probes. * **Comparator/Operational Amplifier:** A circuit that compares the resistance between probes. When water touches the probes, the resistance drops, and the circuit triggers the switch. * **Electromagnetic Relay:** The physical mechanical switch that turns a pump or alarm on or off. * **Protective Components:** Includes Varistors (MOV) for surge protection and capacitors for noise filtering. --- ### 3. Wiring Configuration The 6A5-R usually operates on an 8-pin or 11-pin circular socket. A typical configuration includes: 1. **Power Terminals:** Usually pins 2 and 7 (for AC power). 2. **Output Contacts:** * **Common (COM)** * **Normally Open (NO):** For drainage/pumping out. * **Normally Closed (NC):** For filling/pumping in. 3. **Probe Terminals (E1, E2, E3):** * **E1:** High Level (Stop/Start point). * **E2:** Low Level (Stop/Start point). * **E3:** Ground/Common probe. --- ### 4. Application Logic * **Water Supply:** The relay activates the pump when the water level falls below **E2** and stops when it reaches **E1**. * **Drainage:** The relay activates the pump when the water level reaches **E1** and stops when it drops below **E2**.