Storage tank non-contact LVDT displacement sensors provide reliable position feedback for floating roofs, internal gauges, and level-control systems where mechanical wear must be avoided. A typical model, ST-NLVDT-50, uses a sealed LVDT core and magnetic coupling to measure linear movement without contact between the sensing element and the tank mechanism. Its standard range is 0-50 mm, with optional ranges from 0-10 mm to 0-100 mm. Key specifications include resolution 1 um, repeatability <=2 um, linearity +/-0.05% FS, hysteresis <=0.02% FS, output 4-20 mA, 0-10 V, or RS485 Modbus, supply 24 VDC, and IP67 protection. The sensor operates from -40 degC to +85 degC and resists vibration, dust, and corrosive vapors. Its 316L stainless steel probe and 2 m shielded cable suit tank-farm environments. For installation, mount the sensor on a rigid bracket, set the target gap to 2-5 mm, align the magnetic target with the measuring axis, and keep cable runs away from high-voltage lines. Model selection depends on range, output, tank height, ambient temperature, cable length, and hazardous-area approval such as ATEX or IECEx. Regular zero-point checks, target-gap inspection, and cable verification help maintain accurate level measurement. With non-contact operation, the LVDT sensor reduces maintenance and supports safe, continuous monitoring of storage tank displacement and level. A weatherproof junction box and surge protection are recommended for outdoor tank farms. Calibrate the 4-20 mA span at empty and full positions.