Detection of Transparent Packages in Hazardous Zones

Detecting transparent packages in hazardous areas can be difficult. Transparent PET bottles for instance are hard to detect with conventional light barriers, because they only absorb a small fraction of the incident light.

Fortunately, we offer a robust solution for this application. The following illustration showing how the detection is performed using an optical proximity switch, an optional light guide, a polarisation filter and a retroreflector. This setup can even be installed in machines with very limited space and be used to detect PET preforms, and empty and full bottles.

Required components

The setup illustrated above consists of an Retroreflective Light Barrier ISD-002-OFP-OP or the IDENTIX Proximity Switch IDD-150-POT-OP. This type can be used with optional light guides. Furthermore, it features an optical output power limitation for safe use within ex zones 0 and 20. The IDD-150-POT-OP can be used for the detection of bottle tops.

A light guide MSM-1000-02-T-GS-OP1 can be used in this scenario. The second block of the type designation defines the guide's length in millimeters, which is 1000mm in this example. Variants with lengths of 200mm up to 2000mm are also available.

The robustness of the detection is achieved by using the special head part OT-VA-ZF-M18. This part consists of a focusing optic and a polarisation filter.

Data Sheets

	IDD-150-POT-OP
	ISD-002-OFP-OP
	MSM-xxxx-02-T-GS-OP1-IECEX_e
	OTM18_M30_d6