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Contrast sensor

The contrast sensors FT 25-W and FT 25-RGB are up to 15 times smaller than conventional print mark sensors. Typical areas of application are print mark detection in the printing industry, e.g. in labelling and packaging machines, and in the food industry.

Extremely small sensor with high switching frequency
Sensors Made in Germany 

Typical FT 25

White-light contrast sensor and multi-colour contrast sensor for print mark detection

Contrast sensors are mainly used for printed mark detection in very rapid processes in the print and packaging industries. So it is all the more important that the energetic scanner used is absolutely reliable and does its job without problems. SensoPart offers precisely such "mark" sensors – with white-light LED (FT 25-W, FT 20WT series), red-light laser (FT 25-RL) or RGB diode (FT 25-RGB) options.

FT 25 - Highlights 

FT 25 / FT 20 – Product Overview


Type of light

Scanning distance

Special features


FT 25-W

White LED

12 ± 2,5 mm

Minimal response time 



Red LED, green LED, blue LED

12 ± 3 mm

Automatic selection of ideal transmission colour, minimal response time


FT 25-RL

Red Laser

250 mm

Long scanning distance 


FT 25-C

Red LED, green LED, blue LED 

12 ± 6 mm   

Detecion of color registration marks