Measuring device with plausibility check
Disclosed is a transmitter which achieves a permanently high security standard in an inexpensive manner. The inventive transmitter comprises a set of identically built sensors ( 1, 21, 23 ) for measuring a physical parameter, a set of electronic circuits ( 5 ), each of which is assigned to a sensor ( 1 ) and conditions an electrical signal that is generated by the assigned sensor ( 1 ) and corresponds to the physical parameter, and an output unit ( 17, 25 ) to which the conditioned electrical signals of all sensors ( 1 ) are fed. Said output unit ( 17, 25 ) generates a measuring signal from the conditioned electrical signals, makes said measuring signal available for further evaluation, processing, and/or display, and generates information about the plausibility of the measuring signal and/or information about the operability of the individual sensors ( 1 ).
1 - 11 . (canceled)
12 . A transmitter, comprising:
a set of equally constructed sensors for measuring a physical variable;
a set of electronic circuits, each of which is associated with a sensor, which serve to condition an electric signal, generated by the associated sensor and corresponding to the physical variable; and
an output unit, to which the conditioned electric signals of all said sensors are supplied, wherein said output unit:
produces a measurement signal from the conditioned electric signals and makes it available for further evaluation, processing, and/or display; and
produces a statement concerning the plausibility of the measurement signal and/or a statement concerning the functional capability of individual sensors.
13 . The transmitter as claimed in claim 12 , wherein:
the measurement signal is an average value derived from the electric signals, particularly a median or an arithmetic mean.
14 . The transmitter as claimed in claim 12 , wherein:
the measurement signal is derived from the electric signals, and those signals that deviate from the remaining signals by more than a predetermined amount are not considered.
15 . The transmitter as claimed in claim 12 , further comprising:
a temperature sensor associated with each set of one or more neighboring sensors, wherein:
said sensors are pressure sensors.
16 . The transmitter as claimed in claim 15 , wherein: said temperature sensors serve for compensation of a temperature-dependent measurement-error.
17 . The transmitter as claimed in claim 15 , wherein:
said evaluation unit serves for determining a plausibility of temperature-dependent signals produced by said temperature sensors.
18 . The transmitter as claimed in claim 12 , wherein:
said sensors are pressure sensors and, for measuring a pressure-difference between a first pressure (p 1 ) and a second pressure (p 2 ), a first set of sensors is provided for registering the first pressure (p 1 ) and a second set of sensors is provided for registering the second pressure (p 2 ); and
said output unit calculates the difference between the first pressure (p 1 ) and the second pressure (p 2 ).
19 . The transmitter as claimed in claim 12 , wherein:
said sensors are sensors produced in a batch process and arranged on a base plate.
20 . The transmitter as claimed in claim 19 , wherein:
said electronic circuits are arranged on said base plate.
21 . The transmitter as claimed in claim 12 , wherein:
the transmitter issues a warning, if the functionality of a sensor falls short of a predetermined minimum functionality.
22 . The transmitter as claimed in claim 12 , wherein:
the transmitter issues an alarm, if plausibility and/or functionality fall short of a predetermined minimum.