Optical flame detector performance tester

Details Optical flame detector performance tester Optical flame detector performance tester

1992-09-21

1993-08-17

Dority, Carroll B.

Combustion

With indicator or inspection means

Correlated with action of condition responsive burner control

431 24, 431 79, F23N 526

Patent

active

052363287

ABSTRACT:
A burner control system periodically tests for and detects an out of range signal level from a flame sensor in the burner. When the system is in standby operation where no flame is present, the control system checks whether the flame signal level is within an abnormal range defined by a low margin level and a threshold level. When the system is in an operational phase where flame is expected, the system checks whether the flame signal level is within an abnormal range defined by a high margin level and the threshold level. Should either check detect the flame signal within an abnormal range, a signal is provided indicating this abnormal condition. Preferably, the abnormal condition is used to control the flashing of an indicator light, fast during standby phase if the flame signal level is too close to the threshold level and more slowly if the flame signal level is too close to the threshold level while flame is present. It is also possible to use two different lights for the indicators.

REFERENCES:
patent: 3324927 (1967-06-01), Staring
patent: 4280184 (1981-07-01), Weiner et al.
patent: 4328527 (1982-05-01), Landis
patent: 4713819 (1987-12-01), Yoshikawa
patent: 4823114 (1989-04-01), Gotisar
patent: 4827351 (1989-05-01), Sakamoto
patent: 4955806 (1990-09-01), Grunden et al.
patent: 5077550 (1991-12-01), Cormier

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