Turbiditetsmålere

Turbiditetsmålere, eller turbidity meters, are instruments used to measure the turbidity of liquids, indicating the concentration of suspended particles that scatter light. The most common principle behind these devices is nephelometry, where a light source, usually a laser or LED, illuminates the sample and a detector positioned at a 90‑degree angle to the beam captures the scattered light. The intensity of this scattered light is proportional to the turbidity of the sample, allowing the instrument to display results in standard units such as Nephelometric Turbidity Units (NTU). Alternative methods include gray scale turbidimetry, which measures the overall transmissivity of the light through the sample, and direct nephelometric devices that use a single scattering angle and compensate for scattering media.

Turbiditetsmålere are widely used in environmental monitoring, drinking water treatment, wastewater analysis, and industrial processes where particle concentration must be controlled. In drinking water plants, for example, turbidity must remain below regulatory limits (often 1 NTU) to ensure effective disinfection. In wastewater treatment, increasing turbidity can be an early warning of malfunctioning mechanical processes. In industrial settings, turbidly solutions in cryogenic or pharmaceutical production require precise control to meet product specifications.

Calibration of turbiditetsmålere is carried out with certified turbidity standards, usually in steps of 0, 1, 10, 50, and 100 NTU. Modern instruments feature digital displays, auto‑caching, and internet connectivity for data logging and remote monitoring. They typically operate from a 12‑ or 24‑VDC power supply and feature self‑cleaning sensors that flush the optical path during operation, which helps maintain accurate measurements.