Refrigeration system alarm device
US4502287A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1983 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Jul 18, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J9/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A refrigeration system alarm device includes a temperature monitoring circuit which detects when a temperature within the refrigeration system exceeds a preselectable temperature reference level. The device also includes an alternating current power monitor circuit which detects when any one of a plurality of alternating current power inputs is interrupted. The device also includes a direct current power monitor circuit which includes a battery and a comparator circuit for determining when the voltage of the battery is below a predetermined level. When an excessive temperature is detected or an alternating current power input interruption is detected or the battery voltage is below the predetermined reference level, a visual or audible alarm signal is generated. If an alternating current power input interruption is detected, a control signal generated in response thereto controls a compressor control circuit to prevent a compressor of the refrigeration system from operating during the alternating current power interruption and a predetermined time period thereafter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.