An apparatus for determining and/or monitoring a physical or chemical quantity during a process. The apparatus comprises at least one field device which exchanges data with a remote monitoring station by means of a data connection. The apparatus is provided with at least one fuel cell which is electrically connected to the field device, but arranged at a distance from the field device, and at least partially covers the energy demand of the field device.

 
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> Production method of catalyst for fuel cell and of fuel cell, and catalyst for fuel cell and fuel cell

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