G - Physics – 06 – F
Patent
G - Physics
06
F
341/109
G06F 11/30 (2006.01) G05B 23/02 (2006.01)
Patent
CA 2033860
ABSTRACT OF THE DISCLOSURE A control system receives a condition signal from a sensor specifying by the value of a basic electrical property derivable from the condition signal the level of a preselected condition in a controlled apparatus, and responsive to the condition signal provides a control signal to the controlled apparatus to control the level of the preselected condition. To permit malfunctions in either the control system or the sensor to be efficiently isolated the control system further includes: an encoder which receives the condition signal and provides a signal digitally encoding the value of the basic electrical property in the condition signal, a display which receives the digitally encoded signal and provides a visible display of the digitally encoded value, and a manually operable selector allowing the operator to gate the signal from the encoder to the display by properly manipulating an element of the selector. When a malfunction is suspected, the operator manipulates the selector element to gate the signal from the encoder to the display and notes the value of the basic electrical property. (S)he then measures the basic electrical property in the sensor using an appropriate meter, detaching the sensor from the control system if appropriate. If the basic electrical property noted in the display is substantially unequal to the basic electrical property measured using the meter, this implies that the sensor is operating properly and the malfunction is probably in the control system. If the basic electrical property displayed by the display is substantially equal to the basic electrical property measured using the meter, then it is likely that the sensor is malfunctioning. In a preferred embodiment, the basic electrical property involved may be either electrical resistance or voltage.
Honeywell Inc.
Kidder Kenneth B.
Smart & Biggar
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