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Fluorescence for parts cleanliness inspection

Are the cleaned parts really clean? Or is there still a thin layer of oil?

Prove to your clients and suppliers that your products are “100% clean” by using robust and sensitive fluorescence measurement technology.

Measuring principle of SITA CleanoSpector & SITA clean line CI

The SITA CleanoSpector and the SITA clean line CI detect residual contamination by measuring the fluorescence, which is excited by ultraviolet light from a light emitting diode (LED). A photodiode in the device’s sensor head measures the intensity of the fluorescence.

The measured results can be interpreted in the following way: the higher the measured value, the larger the amount of contamination will be, and thus, the lower the level of cleanliness will be.

Procedure for preparing a calibration (reference) sample

Before a cleanliness inspection can take place, the SITA CleanoSpector must be calibrated on an ideally clean reference part. Thereby, the fluorescence of the ideally clean surface without contamination will be taken into account. In a following measurement on the ideally clean reference part, the SITA CleanoSpector will indicate a cleanliness value of 100%. The calibration value is saved in the measuring device.


1. Intensive cleaning of reference part surface

The reference part is subjected to an intensive cleaning lasting approximately 15 minutes, during which the part is dipped into a fresh, and material-appropriate, aqueous cleaning solution. For steel and other similar materials, an alkaline cleaning agent is recommended. When removing contamination from materials like aluminum and zinc, neutral or mild alkaline cleaning agents should be used.

2. Thorough rinsing with distilled water

Rinsing the reference part with distilled water removes the cleaning agent residues from the surface of the calibration sample. Residues from cleaning agents or residues of solvents fluoresce and cause a false calibration value.

3. Drying the calibration sample

The surface of the calibration sample is dried by hot air (hair dryer) in a dust-free environment.

4. Calibration of the SITA CleanoSpector on the calibration sample

The SITA CleanoSpector can internally store calibration values for up to 255 different part surfaces. These calibration values are only used for measurement profiles "Surface" for the "Cleanliness in %" output and are assigned the value 100 % cleanliness. The calibration should take place on at least five different measurement points on the sample; this avoids accidentally calibrating the device on a selective spot of contamination. The number of calibration points can be adjusted in the device menu. For metallic surfaces, the calibration value should be between 0 and 2 RFU. Higher values can occur with aluminium. A detailed description of essential technical specifications can be found in the STIA CleanoSpector operating instructions.


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