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Inline inspection of cleanliness

Reliable and Robust:

- Measures contamination films on part surfaces continually and contact-free
- Avoids problems during coating, bonding, welding, printing or hardening processes
- Immediate control of cleaning quality


Measurement of layer thickness of oils, corrosion inhibitor or bonding agents


- Highest product quality through controlled cleaning
- Contact-free cleanliness control
- Documentation of lowest contamination levels

System solution for high process security

- Cost effectiveness through process optimization

Product description

The inline fluorescence measurement technology SITA clean line CI is optimal for a continual cleanliness control in cleaning processes. Slight traces of contamination such as oils, greases, cooling lubricants or surfactants cause quality defects in following surface treatment and surface coating processes leading to higher costs. A regular inspection of part surfaces ensures that the required cleanliness levels are maintained. Further actions such as dosing up the cleaning agent components or bath care can be initiated immediately if the part cleanliness decreases.


The measuring system SITA clean line CI can be adjusted to each customer’s unique inspection tasks.


Used with an industrial PC or an SPS with touch panel, the central control unit of the SITA clean line CC allows process-specific system solutions to be realized.

Based on a combined analysis of process and plant, SITA application engineers develop the SITA clean line system solutions to be adapted to each customer’s specific set of criteria.

Measuring principle

Typical contamination in industrial manufacturing processes such as oils, greases or surfactants fluoresce when being excited by ultra violet light. The measured intensity of fluorescence radiation increases with the thickness of the contamination layer.

An integrated UV-LED stimulates the excitation of the fluorescence. A photo-diode measures the intensity of the resulting fluorescence radiation. The calibration of the cleanliness takes place on reference parts defined as being 100 % clean.

Reference surfaces with a known contamination amount are used to determine limit values of reliable cleanliness.


Line Scan Continual monitoring of band surface cleanliness with one or more sensors


Surface Scan Detecting the cleanliness profile of part surfaces with an X-Y positioning system


Free Form Scan Measuring the cleanliness of part surfaces with a 3D positioning system


Practical example: inspection of band steel

High cleanliness standards for the coating of band steel assure a high coating quality in the process. SITA clean line CI measures fluorescence continually and detects even the smallest amounts of contamination.

The cleaning process can immediately be interrupted when cleanliness values fall below defined limit values.

Here you can find further application examples [..]

Technical data

Sensor SITA clean line CI
Housing Anodized aluminum IP51
Measured value Cleanliness or relative fluorescence related to SITA Fluorescence Standard
Surface scan speed Maximum 10 m / s
Dimensions (WxHxD) 50 mm x 95mm x 30 mm
Weight 200 g
Operational Conditions
Relative humidity Maximum 70 %
Surrounding temperature 10 … 50° C
Measured Value Cleanliness
Measuring Range 0 … 100 % cleanliness (100 % correspond to a calibration standard with ideal cleanliness values)
Resolution 0.1 %
Measured Value Fluorescence
Diameter measuring point 1 mm
Measurement distance 4 mm
Measuring Range 0…2,000 RFU (Relative Fluorescence Unit), SITA Fluorescence Standard N1 = 100 RFU
Error of Measurement Maximum 0.5% of measuring range
Resolution 0.1 RFU

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