The **154N-005G-R** is a high-performance, media-compatible, piezoresistive silicon pressure sensor manufactured by TE Connectivity (Measurement Specialties). It is specifically designed for applications requiring high reliability and accuracy in harsh environments. --- ## 1. Core Specifications The following table highlights the primary electrical and physical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Pressure Range** | 0 to 5 psi (Gage) | | **Output Type** | 0mV to 100mV (Typical Span) | | **Excitation** | 1.5mA (Constant Current recommended) | | **Accuracy** | ±0.1% Pressure Non-Linearity | | **Operating Temp** | -40°C to +125°C | | **Package Material** | 316L Stainless Steel | | **Mounting Style** | O-Ring Mount / Weldable | --- ## 2. Key Internal Components The 154N-005G-R utilizes a complex internal structure to isolate the sensitive electronics from the media being measured: 1. **Piezoresistive Die:** The "brain" of the sensor. It is a silicon chip with etched resistors that change resistance when subjected to mechanical strain. 2. **Oil-Filled Cavity:** The sensor die is submerged in silicone oil, which acts as the pressure transfer medium. 3. **Stainless Steel Diaphragm:** A thin 316L SS membrane protects the oil and die. When external pressure hits the diaphragm, it deflects, pushing the oil against the silicon die. 4. **Ceramic Substrate:** The internal circuitry and compensation resistors are mounted on a ceramic base for thermal stability. --- ## 3. Electrical Connection & Pinout The device typically features ribbon cable leads or solder pins. Because it is an uncompensated/unconditioned sensor, it behaves like a **Wheatstone Bridge**. ### Wiring Schematic (Typical) ```text [ + Excitation ] | /-----------/ | Die | <-- Bridge Circuit /-----------/ | | | [- Out] [Ref] [+ Out] | [ - Excitation ] ``` --- ## 4. Application Use-Cases Due to its 316L Stainless Steel construction, it is compatible with corrosive liquids and gases: * **Medical Instruments:** Dialysis machines and infusion pumps. * **Industrial Process Control:** Tank level sensing and pressure transmitters. * **Water Management:** Pumping systems and flow monitoring. * **HVAC:** High-end refrigeration and air pressure monitoring. ---