Electrical transducer
First Claim
1. An electrical transducer using a two-wire process comprising:
- an analog sensor that detects a quantity to be measured;
an analog end stage which is connected downstream of the sensor at the output end of the transducer;
a processor circuit; and
wherein the processor circuit is not connected serially between the sensor and the analog end stage so that a separate analog measurement signal transmission path is realized, the analog end stage converting an output signal of the sensor into an impressed output current with a magnitude which is a measure of the quantity to be measured and is fixed within a range of about 0 to 20 mA, the electrical transducer being controlled by the processor circuit, wherein during normal operation of the electrical transducer, the processor circuit is shifted temporarily from an awake mode into a sleep mode in which the processor circuit is inactive, the analog measurement signal transmission path including an analog scaling unit, the output signal of the sensor and at least one analog setting value are supplied to the analog scaling unit, and the output signal of the analog scaling unit is supplied to the analog end stage;
wherein the output signal of the sensor is routed past the processor circuit via the analog signal transmission path when the processor is in said sleep mode for enabling changes in the quantity being measured to be followed while the processor circuit is inactive;
wherein the processor circuit has an activity time in which the processor circuit is active which is shorter than the time that the processor circuit remains in the sleep mode;
wherein the analog scaling unit comprises an analog arithmetic circuit;
wherein said at least one analog setting value is a DC voltage signal or a direct current signal which is delivered to the analog arithmetic circuit of the analog scaling unit; and
wherein at least one active integrator is connected to the processor circuit and to the analog scaling unit as an actuator for producing said DC voltage signal or direct current signal.
1 Assignment
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Accused Products
Abstract
An electrical transducer has a sensor outputting a value corresponding to the quantity to be measured, an analog end stage connected downstream of the sensor, a processor circuit, and an analog measurement signal transmission path. The end stage converts the sensor output signal into an impressed output current related to the magnitude of the quantity measured, the electronic transducer being controlled with the processor circuit. The electrical transducer can be scaled by the user, has low inherent power consumption and ensures high response speed because the processor circuit in normal operation is shifted temporarily into a sleep mode, in the analog measurement signal transmission path an analog scaling unit is inserted, the output signal of the sensor and at least one analog setting value are supplied to the analog scaling unit, and the output signal of the analog scaling unit is supplied to the analog end stage.
27 Citations
17 Claims
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1. An electrical transducer using a two-wire process comprising:
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an analog sensor that detects a quantity to be measured; an analog end stage which is connected downstream of the sensor at the output end of the transducer; a processor circuit; and wherein the processor circuit is not connected serially between the sensor and the analog end stage so that a separate analog measurement signal transmission path is realized, the analog end stage converting an output signal of the sensor into an impressed output current with a magnitude which is a measure of the quantity to be measured and is fixed within a range of about 0 to 20 mA, the electrical transducer being controlled by the processor circuit, wherein during normal operation of the electrical transducer, the processor circuit is shifted temporarily from an awake mode into a sleep mode in which the processor circuit is inactive, the analog measurement signal transmission path including an analog scaling unit, the output signal of the sensor and at least one analog setting value are supplied to the analog scaling unit, and the output signal of the analog scaling unit is supplied to the analog end stage;
wherein the output signal of the sensor is routed past the processor circuit via the analog signal transmission path when the processor is in said sleep mode for enabling changes in the quantity being measured to be followed while the processor circuit is inactive;wherein the processor circuit has an activity time in which the processor circuit is active which is shorter than the time that the processor circuit remains in the sleep mode;
wherein the analog scaling unit comprises an analog arithmetic circuit;
wherein said at least one analog setting value is a DC voltage signal or a direct current signal which is delivered to the analog arithmetic circuit of the analog scaling unit; and
wherein at least one active integrator is connected to the processor circuit and to the analog scaling unit as an actuator for producing said DC voltage signal or direct current signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of producing an indication of a measured value with an electrical transducer via an output current which is proportional to the measured value, the transducer comprising a sensor, an analog end stage which is connected downstream of the sensor at the output end of the transducer, an electronic circuit which is connected downstream of the sensor, and a processor circuit which is not connected serially between the sensor and the analog end stage so that an analog measurement signal transmission path is realized, the electronic circuit converting an output signal of the sensor into an impressed output current with a level corresponding to the measured value and is fixed within a range of about 0 to 20 mA, the electrical transducer being programmed using the processor circuit, wherein during normal operation of the transducer, the processor circuit is shifted temporarily from an awake mode into a sleep mode in which the processor is inactive, the output signal of the sensor is supplied to an analog scaling unit, at least one analog setting value is supplied to the analog scaling unit, and the output signal of the analog scaling unit is supplied to the electronic circuit;
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wherein the output signal of the sensor is routed past the processor circuit via the analog signal transmission path when the processor is in said sleep mode for enabling changes in the quantity being measured to be followed while the processor circuit is inactive; wherein the processor circuit has an activity time in which the processor circuit is active which is shorter than the time that the processor circuit remains in the sleep mode; wherein the analog scaling unit comprises an analog arithmetic circuit; wherein said at least one analog setting value is a DC voltage signal or a direct current signal which is delivered to the analog arithmetic circuit of the analog scaling unit; and wherein at least one active integrator is connected to the processor circuit and to the analog scaling unit as an actuator for producing said DC voltage signal or direct current signal. - View Dependent Claims (17)
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Specification