Thermally responsive electrical control device and monitoring circuit therefor
US4576487A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1984 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Jan 23, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K3/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A thermally responsive electrical control device is operable for producing a control signal having first and second voltage levels for controlling the operation of a system actuating device for first and second modes of operation. One embodiment of the device includes a multiple bridge circuit for sensing two temperatures and for making multiple control decisions in response to the two temperatures. Another embodiment of the device includes a thermistor and a nonlinear variable resistance element which is matched in a substantially linear relation with the thermistor for compensating for the inherent substantially nonlinear character of the thermistor. Still another embodiment of the device includes a monitoring circuit which is interconnected to a bridge circuit of the device for providing visual indications of sensed temperatures without significantly interrupting the control function of the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.