Method for determining the state of a field measuring instrument for process automation and process instrumentation, and field measuring instrument for carrying out the method
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Abstract
In order systematically to register individual, or a combination of, adverse influences on, and in order to be able better to estimate, service life or ability of a measuring field-device to function, at least one relevant influencing variable, preferably, however, a plurality thereof, is/are evaluated. In such case, Oin addition to a measured value [[(24)]] for a process variable, further variables [[(25) and (26)]] are registered by corresponding sensors mounted on, or in, the measuring field-device and conditioned in analog format in suitable operating circuits, preparatory to registering them digitally with the same A/D-converter [[(21)]] that registers the measurement signal [[A]] for the process variable. Multiplexer [[(22)]] permits selection of the desired input signal, which is then processed further with the aid of a microprocessor [[(23)]]. Then, the combined effect of the different influencing variables is determined and a remaining, probable service life calculated. In case the influencing variables [[(25, 26)]] assume critical values, the microprocessor [[(23)]] can trigger an alarm signal.
21 Citations
110 Claims
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1-55. -55. (canceled)
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56. A method for determining the state of a measuring field-device for process automation and process measurement technology for registering at least one process variable of a process medium, comprising the steps of:
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registering at least one influencing variable influencing expected service life, or ability of the measuring field-device to function, wherein the influencing variable is not the process variable;
comparing the measured influencing variable, or a variable derived therefrom, with a predetermined maximum, or minimum, allowable value for this influencing variable or the derived variable; and
generating and issuing an alarm signal in the case of exceeding of the maximum allowable value, or in the case of subceeding, or falling beneath, the minimum allowable value, of the influencing variable or the derived variable. - View Dependent Claims (58, 59, 60, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82)
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57. A method for determining the state of a measuring field-device for process automation and process measurement technology for registering at least one process variable of a process medium, comprising the steps of:
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registering at least one influencing variable influencing expected service life of the measuring field-device, wherein the influencing variable is not the process variable;
determining probable service life of the measuring field-device, or remaining period of time until the reaching of a point in time for maintenance work, by means of a predetermined function and on the basis of the currently registered influencing variable; and
producing and issuing a report signal, which corresponds to the probable service life of the measuring field-device or the remaining period of time until the reaching of a point in time for maintenance work. - View Dependent Claims (61, 62, 63, 83)
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84. A measuring field-device for process automation and process measurement technology and for registering at least one process variable of a process medium, comprising:
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a measuring device housing with electronics accommodated therein;
a mechanism for registering an influencing variable influencing expected service life, or the ability of the measuring field-device, or a part, or module thereof, to function, wherein the influencing variable is not the process variable;
a mechanism for comparing the measured influencing variable, or a variable derived therefrom, with a predetermined maximum, or minimum, allowable value for this influencing variable or the derived variable; and
a mechanism for generating and issuing an alarm signal in the case of exceeding the maximum allowable value, or in the case of subceeding, or falling beneath, the minimum allowable value, of the influencing variable or the derived variable. - View Dependent Claims (86, 87, 88, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109)
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85. A measuring field device for process automation and process measurement technology and for registering at least one process variable of a process medium, comprising:
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a measuring device housing with electronics accommodated therein;
a mechanism for registering an influencing variable influencing expected service life, or ability of the measuring field-device, or a part, or module thereof, to function, wherein the influencing variable is not the process variable;
a mechanism for determining, by means of a predetermined function and on the basis of the currently registered influencing variable, probable service life, or remaining period of time until the reaching of a point in time for maintenance work on the measuring field-device, or a part, or module thereof; and
a mechanism for generating and issuing a reporting signal corresponding to the probable service life, or the remaining period of time until the reaching of a point in time for maintenance work on the measuring field-device, or a part, or module thereof. - View Dependent Claims (89, 90, 91, 110)
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Specification