Glass plate level gauge

The main structural difference between reflective and transmissive glass plate level gauges is that in reflective level gauges, a pair of parallel mirrors is placed between the liquid and the glass plate, allowing light to return to its original direction after two reflections, thereby enabling the measurement of the liquid level. In transmissive level gauges, a light source is located below the liquid, with a transparent glass plate above the liquid surface; the liquid level is measured through refraction and reflection between the liquid and the glass plate. Therefore, a reflective level gauge requires a mirror, making its structure more complex than that of a transmissive one; however, it offers higher measurement accuracy and greater adaptability. .

The difference between transmissive and reflective types in glass plate level gauges lies mainly in their structure and usage. In the vertical structure of reflective glass plate level gauges, generally only one glass cup and one viewing window cover are used, while in the structure of transmissive glass plate level gauges, the amount of these two materials is doubled. This design approach takes into account the fact that the two different types of glass plate level gauges are used in various operating conditions or with different media. Regarding structural fixation, reflective glass plate level gauges typically use U-shaped bolts as fixing elements, while transmissive glass plate level gauges mostly use hexagonal bolts. Typical transmissive glass plate level gauges are used to measure colorless and transparent media, and they are generally employed in environments with sufficient light ； Reflective glass plate level gauges are mostly used for monitoring liquids with color, but they also require sufficient light to function properly.