Feeler for a monitoring apparatus
OwnerBenno Perreninventor
Life of this patent
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Abstract
With the heretofore known monitoring systems the parameters or magnitudes to be monitored are converted into electrical signals and transmitted, by means of electrical lines or conductors, to a central station. Because electrical signal transmitters are undesired, particularly in explosion endangered atmospheres or surroundings and, further, since spurious signals can be induced in electrical signal lines, proposals have already been made to utilize monitoring apparatuses working with optical signal conductors. The different embodiments of feelers of the invention, for optical monitoring apparatuses, enable monitoring the continuous change and/or exceeding a predetermined threshold, of electrical, mechanical and thermal parameters or the like.
Claims7
A feeler arrangement for a monitoring apparatus comprising:
- a light source for generating a monitoring signal;
- a pair of optical conductor means for transmitting the monitoring signal;
- a light receiver which, in the presence of a change of the monitoring signal, generates a fault signal;
- said pair of optical conductor means coacting with one another to define a separation location embodying an optical junction, the transmittance of which can be altered as a function of a parameter which is to be monitored;
- respective bimetallic elements upon which there are arranged both of said optical conductor means;
- and
- one of said respective bimetallic elements being encased within a material having a reduced thermal conductivity.
Dependencies are inferred from the claim text.