The **WJPA-2BC-R/Q** is a specific variant of an industrial-grade pressure sensor/switch, commonly utilized in automation and fluid power systems. It is part of the **WJPA series** produced by manufacturers like **WOLKE** or similar industrial automation brands. --- ### 1. Technical Specifications Overview The "2BC" and "R/Q" suffixes typically denote the output configuration, pressure range, and connector type. | Feature | Specification Details | | :--- | :--- | | **Component Type** | Digital Pressure Switch / Sensor | | **Input Voltage** | 12 - 24V DC | | **Output Type** | Dual Output (NPN or PNP depending on R/Q configuration) | | **Display Type** | 3-color digital LCD/LED display | | **Pressure Medium** | Non-corrosive gas, air, or non-flammable gas | | **Port Size** | Usually R1/8” or NPT1/8” (Check specific "Q" threading) | | **Accuracy** | ±2% F.S. (Full Scale) | --- ### 2. Electronic Component Breakdown #### A. Internal Sensing Element The device uses a **Piezoresistive Silicon Sensor**. When pressure is applied, the resistance of the silicon bridge changes. An internal **ADC (Analog-to-Digital Converter)** translates this physical change into a digital signal processed by an onboard microcontroller (MCU). #### B. Output Circuitry (The "R/Q" Logic) The suffixes typically refer to the transistor logic used for switching: * **R (NPN):** Open collector output. The load is connected between the positive supply and the output lead. * **Q (PNP):** Open collector output. The load is connected between the output lead and the common (ground). * **Analog Output:** Some versions include a 1-5V or 4-20mA signal for continuous pressure monitoring. #### C. Human-Machine Interface (HMI) * **MCU:** Controls the logic for the set-points (Hysteresis and Window Comparator modes). * **LED Indicators:** Provides visual feedback on whether Output 1 or Output 2 is active. * **Buttons:** Tactile switches used for programming the threshold values. --- ### 3. Wiring Diagram (Typical) Most WJPA models follow a standard 4-wire color code: | Wire Color | Function | Description | | :--- | :--- | :--- | | **Brown** | V+ | DC Positive Power (12-24V) | | **Blue** | 0V | DC Negative / Common | | **Black** | OUT 1 | Digital Switching Output 1 | | **White** | OUT 2 | Digital Switching Output 2 | --- ### 4. Key Application Use Cases * **Leak Detection:** Monitoring pressure drops in sealed systems. * **Vacuum Verification:** Ensuring a suction cup has successfully gripped a part in robotic assembly. * **Filter Monitoring:** Detecting clogs by measuring pressure differentials.