The **F2VS-3F-R/K** is a specific electronic component typically categorized as a **Vibration Sensor** or **Seismic Switch**, commonly used in industrial safety and home appliance applications (such as heaters or boilers). --- ### 1. General Specifications Based on the part numbering convention for the F2VS series (often manufactured by companies like **Morioka** or used in **Rinnai/Noritz** systems), the following technical characteristics apply: | Feature | Description | | :--- | :--- | | **Component Type** | Vibration / Earthquake Sensor (Seismic Switch) | | **Contact Type** | Normally Closed (NC) - Opens upon vibration detection | | **Mounting Style** | Lead wire / Connector type (R/K usually denotes specific terminal/lead variations) | | **Detection Principle** | Internal steel ball or pendulum mechanism | | **Application** | Safety shut-off for gas/electric appliances | --- ### 2. Internal Mechanism and Operation The device functions as a mechanical-to-electrical transducer focused on safety: * **The Pendulum/Ball System:** Inside the housing sits a precision-weighted ball or pendulum on a conductive pedestal. * **The Breaking Point:** When the device experiences a tilt or vibration exceeding a specific G-force (acceleration), the ball moves off its seat. * **Circuit Interruption:** This movement breaks the electrical continuity. In a gas heater, this signal immediately tells the control board (PCB) to close the gas solenoid valve to prevent fires during an earthquake. --- ### 3. Electrical Characteristics While specific datasheets can vary by OEM requirements, standard parameters for the F2VS series include: * **Switching Capacity:** Usually low voltage/current (e.g., **5V - 24V DC**, **10mA - 100mA**). * **Sensitivity:** Calibrated to detect vibrations typically above **100-200 gal** (cm/s²), which corresponds to a significant seismic event. * **Return/Reset:** Most versions are "Auto-reset," meaning the circuit closes again once the vibration stops and the device is level. --- ### 4. Part Suffix Meanings (R/K) The suffixes typically refer to the physical integration of the part: * **-R:** Often indicates a specific **Resistance** value integrated into the line for diagnostic purposes (so the controller can distinguish between a "triggered" sensor and a "cut wire"). * **-K:** Often refers to a specific **Connector** type or a bracket orientation for mounting. --- ### 5. Troubleshooting & Maintenance If this part is failing in a system, it usually manifests as an **Error Code** (like a "Tilt Switch Error"). 1. **Continuity Test:** Use a multimeter in Ohm $(\Omega)$ mode. When level, it should show $0\Omega$ (or the specific resistor value if it's an "R" model). 2. **Tilt Test:** While measuring, tilt the device. The circuit should open (Infinite Ohms). 3. **Mounting:** These are gravity-sensitive. If the sensor is mounted slightly crooked, it will trigger prematurely or fail to reset.