Glasfibre light barriers are available in different width (from 1 to 12 mm²) and with radial or axial light output. 

In the following table the minimum sensing range is indicated (mm) when combined with the sensor serie EFS 1800/EFS 2000/EFS 2100:

Type/Width (mm²)	Light Barrier Axial		Light Barrier  Radial
for sensors with cylinder:	M18	M30	M18	M30
Type 1	60	100	60	100
Type 1,5		100		100
Type 2	100	200	100	200
Type 3	300	500	300	500
Type 4		1500		1500
Type 12		3000		3000

• Monitoring of sludge disposition in liquids
• Monitoring of the needle of gages
• Measuring of the filling level in plastics container
• Measuring of the filling level in powder silos,
• Etc.