The **MLV-1-R/Q** refers to a high-precision, low-pressure sensor (often associated with the All Sensors MLV series). These parts are designed using proprietary technology to provide high stability and accuracy for low-pressure applications. --- ### 1. Key Technical Specifications The "R/Q" designation typically refers to the electrical interface and packaging configuration. Below is a breakdown of the core electronic characteristics: | Parameter | Typical Value / Range | | :--- | :--- | | **Pressure Range** | 0 to 1 inH2O (up to 30 inH2O depending on sub-model) | | **Excitation Voltage** | 5.0 VDC (Typical) | | **Output Type** | Millivolt (mV) Ratiometric | | **Operating Temp** | -25°C to +85°C | | **Linearity/Hysteresis** | 0.25% to 0.5% of Span | | **Input Impedance** | ~2 kΩ | --- ### 2. Electronic Components & Internal Architecture The device is built on a **MEMS (Micro-Electro-Mechanical Systems)** platform. The internal electronics consist of: * **Piezoresistive Wheatstone Bridge:** The heart of the sensor is a micromachined silicon diaphragm with integrated resistors. When pressure is applied, the diaphragm deflects, changing the resistance values. * **Co-planar Configuration:** The "Q" in the part number often denotes a lead configuration or a specific dual-port housing that allows for differential measurement. * **Passive Compensation:** Unlike active digital sensors, the MLV-1-R series often relies on laser-trimmed thick-film resistors to provide temperature compensation and zero-offset calibration. --- ### 3. Pinout and Connection Most MLV series sensors utilize a 4-pin or 6-pin layout. A typical wiring diagram follows this logic: ```markdown Pin 1: +Excitation (Vcc) Pin 2: +Output (Signal High) Pin 3: -Excitation (Ground) Pin 4: -Output (Signal Low) ``` ### 4. Application Integration Because the output is a raw **millivolt signal**, it cannot be plugged directly into a standard microcontroller (like an Arduino or ESP32) without signal conditioning. * **Amplification:** Requires an Instrumentation Amplifier (e.g., AD620 or INA126). * **Filtering:** Low-pass RC filters are recommended to remove high-frequency noise from the low-voltage signal. * **ADC:** A high-resolution Analog-to-Digital Converter (16-bit or 24-bit) is preferred due to the small signal swing. ---