Liquid Level Sensor

This liquid level sensor is a component designed for installation in a liming vat to continuously monitor and provide feedback on the liquid level, ensuring optimal process conditions for the liming operation. It operates by measuring pressure, capacitance, ultrasonic reflection, or optical properties to determine the height of the liquid column within the vat. The sensor is available with a measuring range of 0–3000 mm (standard range; custom ranges available) and offers an accuracy of ±0.5% FS. It provides a 4–20 mA two-wire loop-powered output signal and operates on a supply voltage of 12–36 V DC with reverse polarity protection. The process temperature range is -20–85 °C, and the maximum process pressure is 0–1.6 MPa. The sensor has an ingress protection rating of IP67 per IEC 60529, ensuring it is dust-tight and protected against immersion. Wetted parts are made of stainless steel 316L per ASTM A276 for corrosion resistance. The process connection is a G1/2 thread per ISO 228-1. The weight ranges from 0.5 to 1.5 kg depending on configuration. This sensor is intended for use in machinery and equipment manufacturing, specifically in liming processes. When selecting a sensor, verify the measuring range, accuracy, output signal, supply voltage, operating temperature, process pressure, ingress protection, material compatibility, process connection, and weight against the specific application requirements. Always confirm model-specific values and standards with the legal manufacturer or supplier before procurement. The sensor is a component, not a complete system, and must be integrated with appropriate control and display equipment. Regular maintenance and calibration are recommended to ensure accurate readings. If the sensor fails to provide a stable output or shows signs of damage, it should be inspected and replaced if necessary. The listed standards are procurement references and do not guarantee certification or compliance of any specific product.

The sensor determines liquid level by measuring a physical property that varies with liquid height. Pressure-based sensors measure hydrostatic pressure, which increases with liquid depth. Capacitance sensors detect changes in capacitance caused by the liquid level. Ultrasonic sensors emit sound waves and measure the time for reflection from the liquid surface. Optical sensors use light reflection or refraction. The sensor converts the measured property into a standardized 4–20 mA output signal, which can be read by a control system. The choice of principle depends on the liquid properties, tank geometry, and process conditions. The sensor must be installed according to the manufacturer's instructions to ensure accurate measurement.