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US 7,024,319 B2Granted
Device for determining and/or monitoring a process parameter
AssigneeEndress + Hauser GmbH + Co. KG
InventorsAlexander Mueller, Roland Mueller, Stefan Probst
Life of this patent
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Abstract
A device for determining and/or monitoring a physical or chemical process variable, with at least one electrical, electronic and/or programmable electronic component, which fulfills at least one safety-relevant protective function, wherein the safety-relevant protective function satisfies a given safety standard and is developed according to the given safety standard.
Claims12
A method for determining or monitoring a process variable, comprising the steps of:
- defining a value for at least one process parameter via a selection menu at a second unit not developed according to a safety standard or at a unit not satisfying a safety standard;
- and
- transmitting the selected value of the process parameter to a first unit developed according to a safety standard and fulfilling a safety-relevant protective function, wherein the selected process parameter is transmitted from the first unit back to a second unit;
- and
- storing the parameter in the first unit, when the value of the process parameter displayed at the second unit agrees with the selected value of the process parameter.
2 more elements
A device for determining or monitoring a physical or chemical process variable of a fill substance in a container having:
- at least one electrical, electronic and/or programmable electronic component, which fulfills at least one safety-relevant protective function, wherein:
- the safety-relevant protective function satisfies a given safety standard and is developed according to the given safety standard;
- a signal path is provided, over which at least the analog current signal of the protective function, or of the limit switch function, as the case may be, is transmittable from a first unit into a second unit of said at least one electrical, electronic, or programmable electronic component;
- said first unit satisfies the given safety standard and is developed under the given safety standard;
- said signal path or said second unit does not satisfy the safety standard;
- a control/evaluation unit is provided, which transmits the protective function, or the limit switch function, as the case may be, from said second unit back into said first unit developed under the given safety standard;
- and
- the protective function, or limit switch function, as the case may be, transmitted from said first unit and the protective function, or said limit switch function, read back into said first unit are recognizable and distinguishable.
5 more elements
Dependencies are inferred from the claim text.