Spectrex 40/40U-UB - UV Flame Detector - Manual (Page 27)

TM 40/40U, Rev (7) July 2013
Internal Detector Tests 15
 Relays and heater operation
 Processor Watch dog
 Software
 Memory
 Oscillator frequency
Response to Fault Indication
If a failure is found, the detector indicates by:
 Fault relay:
 Opens in wiring option 1, 2, and 4
 Closes in wiring option 3 and 5
 0-20mA: indicates Fault (0mA or 2mA) in wiring option 1, 2, 3
 LED – Yellow flashes (4 Hz)
 Correcting the Fault
The fault indications remain until the detector’s power is removed. The fault
indications return if the fault is still found when power is restored.
1.6.2 Built-In-Test (BIT)
The detector’s Built-In-Test (BIT) also checks the following:
 Electronics circuitry
 Sensors
 Window cleanliness
The detector can be set to perform the BIT in the following modes:
 Automatically and manually
 Manually only
Note: In Manual BIT, the outputs may also be tested and Control System
‘inhibit’ should be applied if this could initiate other systems.
1.6.2.1 How the BIT Operates
 The detector's status remains unchanged if the result of a BIT is the
same as the current status (NORMAL or BIT Fault)
 the detectors’ status is changed (from Normal to BIT Fault or vice versa)
if the BIT differs from the current status
Note: In ‘BIT Fault’ status the detector can continue to detect a fire.