Electronic measuring device for detecting a process variable, in particular a radar or ultrasonic filling level measuring device, and a method for operating a measuring device of this type
First Claim
1. An electronic measuring device for detecting a process variable connectable to a two-wire line for providing the supply energy and for digital communication with a process control, comprising a two-wire terminal, a sensor to measure the process variable, a controlling device for controlling components of the sensor, a voltage measuring device for measuring supply voltage applied through the two-wire line, and a current control unit to supply input current for the measuring device can be appropriately set as a function of the supply voltage measured by the voltage measuring device, so that the input current is adapted corresponding to the actual power demand during a time that is not detrimental to the communication.
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Abstract
The invention related to a method and an electronic measuring device for detecting a process variable connectable to a two-wire line (101) for providing the supply energy and for digital communication with a process control, and a method for operating such a measuring device. An inventive measuring device includes a sensor means (114, 115, 123, 124; 314, 315, 323, 324) for measuring the process variable, a controlling device (117; 317) for controlling components of the measuring device, a voltage measuring device (116; 316) for measuring the supply voltage applied through the two-wire line (101), and a current control unit (122; 322) by means of which the current for supplying the measuring devices can be modified in a temporally appropriate manner as a function of the supply voltage measured by the voltage measuring device (116; 316).
13 Citations
33 Claims
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1. An electronic measuring device for detecting a process variable connectable to a two-wire line for providing the supply energy and for digital communication with a process control, comprising
a two-wire terminal, a sensor to measure the process variable, a controlling device for controlling components of the sensor, a voltage measuring device for measuring supply voltage applied through the two-wire line, and a current control unit to supply input current for the measuring device can be appropriately set as a function of the supply voltage measured by the voltage measuring device, so that the input current is adapted corresponding to the actual power demand during a time that is not detrimental to the communication.
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11. An electronic measuring device for detecting a process variable connectable to a two-wire line for providing the supply energy and for digital communication with a process control, comprising
a two-wire terminal, a sensor to measure the process variable, a controlling device for controlling components of the sensor, and a current control unit to set current drawn through the two-wire line terminal as a function of the current drawn by the sensor so that the current is adapted corresponding to actual power demand and is not detrimental to the communication.
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21. A method for operating an electronic measuring device for detecting a process variable connectable to a two-wire line for providing the supply energy and for digital communication with a process control, comprising:
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measuring the supply voltage applied through the two-wire line and modifying current to the measuring device in a temporally appropriate manner as a function of the measured supply voltage so that the current is adapted corresponding to the actual power demand while allowing digital communication. - View Dependent Claims (22, 23, 24, 25)
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26. A method for operating an electronic measuring device for detecting a process variable connectable to a two-wire line for providing the supply energy and for digital communication with a process control, comprising:
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determining current drawn by a sensor;
adapting total current drawn through the two-wire line by the measuring device to the determined sensor current using a current control unit such that the drawn total current is adapted corresponding to the actual power demand within a space of time not detrimental to communication. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A two-wire line, electronic measuring device for detecting a process variable, comprising:
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a two-wire terminal;
a sensor operably connected to the two wire terminal and adapted to detect the process variable;
a voltage measuring device operably connected to the two-wire terminal and adapted to measure a supply voltage; and
a current control unit operably connected to the two-wire terminal, the current control unit being adapted to supply current as a function of the supply voltage measured by the voltage measuring device such that the input current meets power demand and allows digital communication.
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Specification