Water treatment system ultraviolet bulb voltage monitor circuit
US5401394A · kind A · utility
16Cited by
28References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1993 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Jan 11, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2201/326
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The specification discloses a circuit for monitoring the status of an ultraviolet (UV) light bulb in a water treatment system. The circuit uses either transformers or zener diodes with opto-isolators to monitor the voltage across the bulb. A logic signal is emitted when abnormally high voltage is detected, for example, indicating that the bulb is burned out, broken, or missing. A logic signal also is emitted when abnormally low voltage is detected, for example, indicating that the starter circuit is short circuited or that power is interrupted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.