Measuring instrument
First Claim
1. A measuring arrangement comprising:
- a measuring instrument and a higher-order unit, said measuring instrument and said higher-order unit being electrically connected with each other by a first pair of lines and a second pair of lines, wherein during operation a signal current flows via said first pair of lines and a supply current flows via said second pair of lines, said signal current representing an instantaneous measured value and said supply current and at least a portion of the signal current supply said measuring instrument.
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Abstract
A description is given of a measuring instrument to be connected to a higher-order unit having at least a first and an identical second pair of terminals, which can be connected electrically, very simply and without errors, to the higher-order unit, the measuring instrument comprising: a first pair of lines, to be connected to the first pair of terminals, via which a signal current flows during operation, the signal current being a measure of an instantaneous measured value, and a second pair of lines, to be connected to the second pair of terminals, via which a supply current flows during operation, whose value is greater than or equal to a minimum signal current and less than or equal to a maximum signal current.
15 Citations
18 Claims
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1. A measuring arrangement comprising:
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a measuring instrument and a higher-order unit, said measuring instrument and said higher-order unit being electrically connected with each other by a first pair of lines and a second pair of lines, wherein during operation a signal current flows via said first pair of lines and a supply current flows via said second pair of lines, said signal current representing an instantaneous measured value and said supply current and at least a portion of the signal current supply said measuring instrument. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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- 10. An adapter circuit system for an electrically powered measuring device, wherein two ports are provided constituting a two-wire interface for connecting a dual-conductor cable by way of which electric power is fed to the measuring device and a measuring signal from the measuring device is transmitted wherein at least one additional port is provided for connecting a second cable and wherein the said second cable allows the feeding of additional electric power to the measuring device.
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18. A measuring device wherein two ports are provided constituting a two-wire interface for connecting a dual-conductor cable by way of which electric power is fed to the measuring device and a measuring signal is transmitted from the measuring device to an evaluation circuit, wherein at least one additional port is provided for connecting a second cable, the said second cable allowing the feeding of additional electric power to the measuring device, providing the possibility to either use the measuring device in an intrinsically safe mode by only using the said two ports of the two-wire interface or to use the measuring device in a non-intrinsically safe mode by using the said two ports of the two-wire interface and the said additional port to which the said second cable is connected.
Specification