A pressure sensor/transducer is a component used in machinery and equipment manufacturing to measure fluid or gas pressure and convert it into a standardized electrical output signal, such as 4-20 mA or 0-10 V. It is a critical part of a Pressure Testing Unit, where it detects pressure and transmits data to monitoring, data acquisition, and control systems, ensuring testing accuracy and safety. The sensor typically operates on piezoresistive, capacitive, or strain gauge principles. Applied pressure deforms a sensing element (e.g., a diaphragm), changing its electrical properties (resistance or capacitance), which an internal circuit measures and converts into a proportional output signal. Common materials include stainless steel for the housing and diaphragm, silicon for piezoresistive elements, and ceramic for capacitive elements. Key parameters to verify for a specific application include pressure range (e.g., 0–1.6 MPa), accuracy (e.g., ±0.25% FS per IEC 60770), output signal (e.g., 4–20 mA), supply voltage (e.g., 12–36 V DC), operating temperature (e.g., -40–85 °C), process connection (e.g., G1/2 per DIN 3852), ingress protection (e.g., IP65–IP67 per IEC 60529), wetted parts material (e.g., 316L per ASTM A240), overpressure limit (e.g., 2× FS), response time (e.g., ≤10 ms), and weight (e.g., 0.3–0.5 kg). These values are directory references and must be confirmed with the legal manufacturer or supplier for the actual model. Standards listed are procurement references, not certifications. Always verify model-specific values and standards before purchase or installation.
The sensor operates on piezoresistive, capacitive, or strain gauge principles. Pressure applied to the sensing element (a diaphragm) causes physical deformation, which changes its electrical properties—resistance in piezoresistive and strain gauge types, or capacitance in capacitive types. An internal circuit measures this change and converts it into a proportional electrical output signal, typically 4-20 mA or 0-10 V. The output is linearized and amplified for compatibility with control systems.
