The **154CV-300G-R** is a high-precision, media-isolated pressure sensor designed for applications requiring high reliability and compatibility with harsh environments. It is manufactured by TE Connectivity (formerly Measurement Specialties). --- ## 1. Core Specifications The alphanumeric code "300G" indicates a 300 psi Gauge pressure range. Below are the primary technical parameters: | Feature | Specification | | :--- | :--- | | **Pressure Range** | 0 to 300 psi | | **Pressure Type** | Gauge (referenced to atmospheric pressure) | | **Output Type** | Constant Voltage (0-100mV typical span) | | **Input Excitation** | 1.0mA or 10V (typical) | | **Accuracy** | ±0.1% to ±0.25% Non-linearity | | **Operating Temp** | -40°C to +125°C | | **Material** | 316L Stainless Steel | --- ## 2. Structural Design The "154CV" series is known for its **Media-Isolated** architecture. ### Internal Components: * **Sensing Die:** A micromachined piezoresistive silicon chip. * **Oil Fill:** The sensor die is submerged in silicone oil. * **Isolation Diaphragm:** A thin 316L stainless steel diaphragm protects the sensitive silicon chip from the liquid or gas being measured. * **Housing:** A cylindrical stainless steel body (19mm diameter) designed for O-ring mounting. --- ## 3. Working Principle 1. **Pressure Application:** External pressure presses against the stainless steel diaphragm. 2. **Transfer:** The pressure is transferred through the internal silicone oil to the silicon sensing chip. 3. **Bridge Response:** The piezoresistive Wheatstone bridge on the chip changes resistance in proportion to the pressure. 4. **Signal Output:** The sensor produces a millivolt (mV) output signal that requires external amplification or signal conditioning to be read by a microcontroller. --- ## 4. Common Applications Due to its rugged construction and high accuracy, the 154CV-300G-R is used in: * **Industrial Process Control:** Monitoring pipelines and hydraulic systems. * **Medical Instruments:** Dialysis machines or pressure-sensitive surgical tools. * **Fresh Water/Wastewater:** Measurement in tanks where fluids might corrode standard silicon sensors. * **Air Compressors:** High-cycle monitoring of pneumatic lines. --- ## 5. Wiring and Connectivity This model typically features **ribbon cable or solder pads**. Because it is an uncompensated or minimally compensated sensor (depending on the specific "C" variant sub-type), it usually follows a standard bridge configuration: 1. **Pin 1:** +Excitation 2. **Pin 2:** +Output 3. **Pin 3:** -Output 4. **Pin 4:** -Excitation