US5209076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for preventing compressor damage in a refrigeration system
Assignee: IZON Inc A DE CORP
•
Filing: 1992-06-05
•
Granted: 1993-05-11
•
Expires: 2012-06-05
Abstract
Abstract A microprocessor based device which monitors the operation of a compressor in a refrigeration system and automatically shuts the compressor down if a monitored condition is abnormal. Sensors in the refrigeration system sense conditions such as refrigerant pressure and temperature, superheat, oil pressure and motor current draw. If a sensed condition is outside of a safety range and remains there for a time out period, an alarm condition is indicated and the device generates a alarm signal and shuts down the compressor. A detachable display module includes a keypad for carrying out field programming and a LCD screen for displaying the refrigerant conditions and programming prompts and commands. A rest button permits resetting twice before a service call is required.
Inventors
- 👤 Gary O. Kauffman
- 👤 Michael L. Hobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:15
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/005; F25B2600/00; F25B2600/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
A microprocessor based apparatus for monitoring the operation of a cooling system which includes a compressor having a suction side to which refrigerant gas is delivered and a discharge side from which the refrigerant gas is discharged, said apparatus comprising: microprocessor means; a visual display controlled by said microprocessor means; means for sensing the superheat condition of the refrigerant gas at the suction side of the compressor; means for monitoring additional operating parameters of the cooling system; means for entering in said microprocessor means a selected superheat value indicative of a gaseous state of the refrigerant; means associated with said microprocessor means for comparing the superheat condition sensed by said sensing means with said selected superheat value and for deactivating the compressor when the superheat condition sensed by said sensing means drops below said selected superheat value; means for displaying on said visual display the superheat condition sensed by said sensing means and the values of said additional operating parameters; and means for providing a printed record of the superheat condition sensed by said sensing means and the values of said additional operating parameters.
Claim 2
Dependent Claim
184 words
A microprocessor based apparatus for monitoring the operation of a cooling system which includes a compressor having a suction side to which refrigerant gas is delivered and a discharge side from which the refrigerant gas is discharged, said apparatus comprising: microprocessor means; a visual display controlled by said microprocessor means; means for sensing the superheat condition of the refrigerant gas at the suction side of the compressor; means for monitoring additional operating parameters of the cooling system; means for entering in said microprocessor means a selected superheat value indicative of a gaseous state of the refrigerant; means associated with said microprocessor means for comparing the superheat condition sensed by said sensing means with said selected superheat value and for deactivating the compressor when the superheat condition sensed by said sensing means drops below said selected superheat value; means for displaying on said visual display the superheat condition sensed by said sensing means and the values of said additional operating parameters; and means for providing a printed record of the superheat condition sensed by said sensing means and the values of said additional operating parameters.
References Cited (Backward Citations)
US2120764A
Cited
US2448403A
Cited
US2534455A
Cited
US2451072A
Cited
US2461342A
Cited
US2871673A
Cited
US3132490A
Cited
US3180567A
Cited
US3290576A
Cited
US3312081A
Cited
US3412574A
Cited
US3411313A
Cited
US3577743A
Cited
US3766747A
Cited
US3866427A
Cited
US3913347A
Cited
US4038061A
Cited
US4136822A
Cited
US4545212A
Cited
US4677830A
Cited
US4563878A
Cited
US4718250A
Cited
US4788826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |