The **SF-34-R** typically refers to a high-precision, industrial-grade **Ultrasonic Point Sensor** or level switch, often used for non-contact detection of liquids or solids. Below is a breakdown of its electronic components and technical specifications. --- ## 1. Core Electronic Components The device operates using ultrasonic technology, involving several key internal modules: | Component | Function | | :--- | :--- | | **Piezoelectric Transducer** | Converts electrical energy into high-frequency sound waves (and vice versa). | | **Oscillator Circuit** | Generates the specific frequency required to drive the transducer. | | **Signal Processor (ASIC/MCU)** | Analyzes the "time-of-flight" or resonance to determine if a material is present. | | **Output Driver** | A Relay or Transistor (PNP/NPN) circuit that switches the external load. | | **Potentiometer** | Allows for manual adjustment of sensitivity or delay settings. | --- ## 2. Technical Specifications Most sensors in this series (like those produced by manufacturers such as *Scientific Technologies* or *Automation Products*) follow these standard parameters: ### Electrical Characteristics * **Supply Voltage:** Usually 12-24V DC or 115/230V AC (depending on the specific sub-model). * **Power Consumption:** Low wattage, typically < 2W. * **Output Type:** Relay Contact (indicated by the **"R"** in the suffix). * *Contact Rating:* Typically 5A at 250V AC. * **Response Time:** 50ms to 100ms (adjustable via internal circuitry). ### Performance * **Operating Frequency:** Usually between 30kHz and 40kHz. * **Detection Range:** Designed for point-level detection rather than long-distance ranging. * **LED Indicators:** * **Green:** Power On. * **Red/Amber:** Sensor state (Detecting vs. Not Detecting). --- ## 3. Connection Diagram Logic The electronic wiring for the **SF-34-R** generally follows this logic: ```yaml Terminal 1: Line / V+ (Power Supply) Terminal 2: Neutral / Common (Power Supply) Terminal 3: Relay Common (C) Terminal 4: Normally Open (NO) Terminal 5: Normally Closed (NC) ``` --- ## 4. Operational Logic 1. **Emission:** The electronic control board pulses the transducer. 2. **Reflection:** The sound wave bounces off the target material. 3. **Reception:** The electronics switch from "transmit" to "receive" mode. 4. **Switching:** If the signal strength exceeds the threshold set by the internal potentiometer, the **Relay (R)** is energized, flipping the contacts to trigger an alarm or pump.