US PATENT SUBCLASS 431 / 24
.~ With test circuit checking or analyzing flame sensing circuit for malfunction

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
24.~ With test circuit checking or analyzing flame sensing circuit for malfunction {2}
25  DF  .~.~> Utilizing unidirectional electrical conducting effect of flame
26  DF  .~.~> Test circuit activated, then inactivated in starting

DEFINITION

Classification: 431/24

(under subclass 18) Apparatus including structure response to a signal indicating abnormality or malfunction that is produced by an electrical circuit means which (1) tests or checks a combustion sensor and its circuit or (2) analysis a signal from a combustion sensor to distinguish a tone flame signal from a false signal.

SEE OR SEARCH CLASS

340, Communications: Electrical,

514+, for an electrical communication system of general application automatically responsive to a condition having means for testing the sensor or the means conveying the signal from the sensor to a control or indicator.