The **SES-2A2-R/Q** is a high-performance, differential pressure sensor (also classified as a pressure transmitter) typically used in industrial automation, HVAC systems, and cleanroom environments. It is part of the SES series designed for high precision in measuring low-pressure ranges. --- ### ## 1. Technical Specifications The device converts physical pressure differences into standardized electrical signals. Below are the primary electronic and mechanical specifications: | Feature | Specification | | :--- | :--- | | **Input Type** | Differential Pressure (Air and Neutral Gases) | | **Supply Voltage** | 24V DC/AC (±15%) | | **Output Signal (R)** | 4-20 mA (Current Loop) | | **Output Signal (Q)** | 0-10 V DC (Voltage) | | **Accuracy** | ±1.0% to ±1.5% FS (Full Scale) | | **Response Time** | < 100ms (Adjustable in some sub-models) | | **Protection Class** | IP65 (NEMA 4 equivalent) | --- ### ## 2. Core Electronic Components The reliability of the SES-2A2-R/Q stems from several key internal stages: 1. **Piezoresistive Sensing Element:** * The "heart" of the device. It uses a silicon-based micro-machined diaphragm with integrated strain gauges. * When pressure is applied, the diaphragm deforms, changing the electrical resistance (the Piezoresistive effect). 2. **ASIC (Application-Specific Integrated Circuit):** * This component handles **Signal Conditioning**. * It amplifies the millivolt signal from the sensor and performs linear temperature compensation to ensure accuracy across various climates. 3. **Output Conversion Circuit:** * **"R" Version:** Contains a V/I (Voltage to Current) converter to output a stable 4-20mA signal, ideal for long-distance transmission without signal loss. * **"Q" Version:** Contains a voltage regulator to output a steady 0-10V signal for PLC or BMS integration. 4. **Protection Circuitry:** * Includes **Reverse Polarity Protection** to prevent damage if the power wires are swapped. * Includes **EMC Filtering** to suppress electromagnetic interference from nearby motors or heavy machinery. --- ### ## 3. Wiring Configuration Most SES series units utilize a standard 3-wire or 2-wire terminal block depending on the output type. ```text Terminal 1: +24V Supply (V+) Terminal 2: Common / Ground (GND) Terminal 3: Signal Output (Out) ``` --- ### ## 4. Applications * **Filter Monitoring:** Measuring the pressure drop across air filters to determine when they need replacement. * **Cleanrooms:** Maintaining a positive pressure environment to keep contaminants out. * **Fan Control:** Providing feedback to Variable Frequency Drives (VFDs) to maintain constant airflow.