Ext. Monitoring

External flash monitoring system

This device monitors the correct functioning of a flashing light by opto-electronic means. The flash from the light is fed via an optical fibre to a phototransistor, which converts the optical impulse to an electrical impulse. The electronic circuit evaluates the pulse and its regular repetition. As soon as the operating voltage is applied, the evaluation relay closes the changeover contact. If the operating voltage fails, the relay opens immediately.

This method of operation represents the fail-safe normally-closed circuit function and guarantees an alarm even if the operating voltage fails. On the other hand, the changeover contact serves to continue an alarm, e.g. in a failure message line, or the direct blocking of further machine processes.

Technical data

Electrical dataExternal flash monitoring
Rated voltage230 V AC12 V DC24 V DC12 V DC
Rated frequency50/60 Hz
Operating range198–242 V11–15 V16–34 V38–52 V
Nominal current consumption0.001 A0.050 A0.050 A0.050 A

Technical details can be found in the product download on this page on the top at the right.


Description Language Type Size Download

Product Sheet

  • English
pdf 400 KB Download

Ordering details

Suitable for...Rated voltageArticle number
any flashing light with a 1 Hz flash rate24 V DC29130800000