The **WJFX-601-R** is a specific model of a **Liquid Flow Switch** (often categorized under industrial electronic sensors). These devices are critical in HVAC, water treatment, and industrial cooling systems to monitor the movement of fluids within a pipe. --- ### 1. Key Technical Specifications The WJFX-601-R typically operates as a paddle-style switch. Below are the common electronic and physical parameters: | Parameter | Specification | | :--- | :--- | | **Switch Type** | SPDT (Single Pole Double Throw) | | **Contact Rating** | 15A @ 125/250VAC | | **Pressure Rating** | Up to 10 bar (1.0 MPa) | | **Fluid Temperature** | 0°C to 100°C (standard range) | | **Connection Size** | R 1" (Tapered Pipe Thread) | | **Enclosure Material** | Die-cast Aluminum or reinforced plastic (varies by sub-type) | --- ### 2. Internal Electronic Components The device functions by translating mechanical movement into an electrical signal. The core electronic parts include: 1. **Microswitch (The Core):** * Inside the housing is a high-quality microswitch. * When fluid flows, it pushes a paddle; this mechanical force is transmitted via a linkage to trigger the microswitch. 2. **SPDT Terminal Block:** * **COM (Common):** The input line. * **NO (Normally Open):** Closes the circuit when flow is detected (used to start pumps/chillers). * **NC (Normally Closed):** Opens the circuit when flow is detected (used for "low flow" alarms). 3. **Sensitivity Adjustment Screw:** * A spring-loaded mechanism that allows the user to calibrate at what flow rate the switch triggers. Increasing spring tension requires higher fluid velocity to activate the switch. --- ### 3. Connection Diagram (Standard Wiring) The wiring is straightforward, typically involving three main terminals: ```text [ Terminal Box ] | +-- (COM) --- Line In (Live) | +-- (NO) --- To Load (e.g., Compressor/Pump) | +-- (NC) --- To Alarm/Warning Light ``` --- ### 4. Common Applications * **Chillers:** To ensure water is circulating through the evaporator before the compressor starts (prevents freezing). * **Boilers:** To prevent dry-firing by ensuring water is moving. * **Pump Protection:** Shuts down a pump if the fluid source runs dry. ---