What is turbidity meter & How does it work?

Turbidity meter is also called turbidimeter, is a tool used to measure the level of turbidity of analyzed water or solutions. A Turbidity meter is a tool that has optical properties due to the dispersion of light, which can be expressed as a ratio of light reflected to the incident light. The intensity of light reflected from a suspension is a function of the concentration if all other conditions are constant.

Turbidity in liquids is usually caused by a variety of factors, including microscopic particles, such as microorganisms present in the liquid, dissolved solids, etc.

There are two types of general-purpose turbidity meters in common use today, namely:

  • Benchtop and portable units for sample grabbing on top of the analytical unit Benchtop is usually used as a fixed laboratory instrument and is not suitable for portable use.
  • In-line instruments are usually installed in the field and continuously analyze the sample stream overflowing from the process sampling unit.

The purpose of this turbidimetric tool is to store samples or standards in vials/sample bottles. The tool is set up before use, where the numbers listed must be 0 or in neutral, and then measured by turning the control knob to adjust the measured value until the value displayed on the turbidimeter screen matches the standard value.

Afterwards, insert the sample into the sample measurement site on the turbidimeter and read the results directly from the turbidity measurement scale listed on the screen. However, the sample measurement must be performed 3 times, each time pressing the Repeat Measurement button repeatedly to make the measurement correct or valid, and the results averaged immediately.

Turbidimetric analysis is based on measuring the intensity of transmitted light as a function of the concentration of the dispersed phase. When light passes through the suspension, part of the energy of the falling radiation is transmitted through absorption, reflection and the rest will be transmitted. The water sample is then partially absorbed and partially passed through, and the absorbed light is the level of turbidity.

Therefore, the more light is absorbed, the more turbid the liquid. According to WHO (World Health Organization). stipulates that the turbidity level of drinking water should not exceed 5 NTU and ideally should be below 1 NTU. Based on this theory, it can be said that all samples tested are eligible for consumption because the turbidity (cloudiness) level is below 5 NTU.

Turbidity instrument measuring principle

An infrared diode shines infrared light into the medium. The particles in the medium reflect the irradiated light detected by the receiving diode (backscattering principle). The electronic device calculates the relative turbidity of the medium based on the received signal.

Turbidity meters produce a quick return on investment

Turbidity meter is a simple and affordable way to bring great returns to your process. From reducing CIP consumables to increasing yields through improved conversion, turbidimeters are ideal for sustainability-conscious manufacturers. For more information on how to integrate turbidimeter into your process or for more information on calculating potential ROI, please contact Apure representative immediately.