Automatic boiler level controller
US6666086B2 · kind B2 · utility
62Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2001 |
| Grant date | Dec 23, 2003 |
| Priority date | — |
| Expiry date | Jun 29, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D9/12
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An improved boiler water-level controller. According to one aspect of the present invention, a positive blowdown signal is presented to indicate to the operator that the alarm probe is in steam; performing blowdown until this indicator turns on helps ensure that the alarm probe is working properly. According to another aspect of the present invention, the controller uses a novel methodology of sensing water level using conductivity probes. An embodiment of this methodology uses the charging and discharging of a capacitor through a resistive value to sense the presence of water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.