Two-wire transmitter with threshold detection circuit
First Claim
1. A two-wire current transmitter for providing a transmitter output which is representative of a parameter to be sensed, comprising:
- sensing means, having a sensor responsive to the parameter and an excitation means coupled to the sensor for providing an excitation output for exciting the sensor, for providing a sensor output which varies as a function of the excitation output and the parameter to be sensed;
output means coupled to the sensor output for providing the transmitter output as a function of the sensor output to the two-wire circuit; and
threshold detection means coupled to the sensor output, having at least one predetermined threshold value, for providing a detector output to the output means as a function of the sensor output and the threshold value, such that the transmitter output is further representative of an undesired change in the excitation output.
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Accused Products
Abstract
A threshold detection circuit for improving the output of a two-wire transmitter is disclosed. The transmitter comprises a sensing means which has a sensor responsive to a parameter to be sensed by the transmitter and an excitation means which provides an excitation output to excite the sensor. A threshold detection circuit is coupled to the sensor output and provides a detector output representative of an undesired change in excitation output which can produce a sensor output not substantially representative of the sensed parameter. An output means is coupled to the sensor output and detector output and provides the transmitter output as a function of the sensor output and detector output. A distinctive transmitter output representative of an undesired change in excitation output thus detected is provided, thereby improving the transmitter output.
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Citations
7 Claims
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1. A two-wire current transmitter for providing a transmitter output which is representative of a parameter to be sensed, comprising:
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sensing means, having a sensor responsive to the parameter and an excitation means coupled to the sensor for providing an excitation output for exciting the sensor, for providing a sensor output which varies as a function of the excitation output and the parameter to be sensed; output means coupled to the sensor output for providing the transmitter output as a function of the sensor output to the two-wire circuit; and threshold detection means coupled to the sensor output, having at least one predetermined threshold value, for providing a detector output to the output means as a function of the sensor output and the threshold value, such that the transmitter output is further representative of an undesired change in the excitation output. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification