Inline analyser system for edible oil and fat processing
May 2016Analytical Instrumentation & Environmental Monitoring
Krohne has introduced Optiquad-EOF 4050 W for the continuous inline measurement of free fatty acids (FFA), total polar material (TPM), peroxide value (POV), moisture or dirt. The optical spectroscopic analyser system targets frying and other edible oil as well as fat applications.
The analyser measures directly in the pipe: analysis is through an optical window mounted in a standard Varinline measuring section. The readings of FFA, TPM, POV moisture or dirt are provided instantly for process or dynamic control loops via four 4-20 mA outputs. Depending on the application, measurement of anisidine value (AV) and iodine value (IV) are possible. Compared to conventional laboratory methods used to obtain these values, Optiquad-EOF 4050 W reduces the need for sampling, sample transport and handling, and the associated sources of error and costs.
The optical spectroscopy analysing method allows for a wide range of use in edible oil applications, such as oil extraction, oil refinement and frying processes, up to oil recycling, as well as fat processing. For example, the continuous inline measurement of FFA content in frying oil helps to minimise the addition of fresh oil: the FFA value can be kept below a defined limit whilst allowing a high level of quality. It also provides a wide measuring range, e.g. 0-98% for FFA.
The system consists of the analyser unit (protection rating IP65/NEMA4X) and the operating unit, an industrial PC with touch screen display for parameterisation and automatic calibration in a stainless steel housing (IP65/NEMA4X), optionally built into a switch cabinet. It uses up to four measuring methods (transmission, scattering, fluorescence and refraction) with up to 12 wavelengths from ultraviolet to infrared. The underlying calibration is calculated automatically from reference data specific to the application.
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