Siemens Aktiengesellschaft

Erik Lang

Josef Lelle

Alexander Diebold

Ulrich Hofmann

Tharsice Ball

Various embodiments include a switching arrangement comprising: two processors; an OR gate; a first position feedback device; and a first switch. The a first switch. The OR gate output is connected to the first switch. The first processor is connected to the first input of the OR gate and the second processor is in operative communication with the OR gate via the second input of the OR gate; At least one of the processors sends a digital ON signal to the OR gate and the OR gate actuates the first switch on receipt thereof. The first position feedback device connects to both processors. The processors are interconnected and each programmed to: read a first position signal from the first position feedback device; send the first position signal to the other processor; compare the read signal to the received signal; and generate an error message if they do not match.

Protection against internal faults in burners

A monitoring device has a first flame detector, to receive a first batch of radiation, which is emitted by the first flame, a second flame detector, to receive a second batch of radiation, which is emitted by the second flame, a voltage supplying device to apply an alternating voltage with a first half wave and a second half wave to the two flame detectors and an evaluation circuit that is connected to the two flame detectors via a signal input. A first measurement signal that is present at the common signal input during the first half wave is indicative of the intensity of the first batch of radiation. A second measurement signal that is present at the common signal input during the second half wave is indicative of the intensity of the second batch of radiation. The evaluation circuit independently evaluates the first measurement signal and the second measurement signal.

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Ettlingen, Germany

Erik Lang