SMC Sierra Monitor 3600-I, Руководство пользователя

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Model 3600-I IR3 Flame Detector
Page 24 of 66
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)

T
he 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.
1.6.2.2 Automatic BIT
The detector automatically performs a BIT every 15 minutes. A successful BIT sequence does not activate
any indicator.
The results of a successful and unsuccessful BIT are listed in the tables below.
Output Result
Fault relay

Wiring options 1, 2, 4: remains CLOSED

Wiring options 3 and 5: remains OPEN
0-20mA output Wiring option 1, 2, 3: Normal (4mA)
Power LED Green, Flashing, 1 Hz On (Normal)
Figure 14: Results of a Successful BIT
Output Result
Fault relay

Wiring option 1, 2, 4: changes to Open

Wiring option 3 and 5: changes to Closed
0-20mA output Wiring option 1, 2, 3: BIT Fault (2mA)
Power LED Yellow, Flashing (4 Hz)
BIT procedure Performed every 1 minute
Figure 15: Results of an Unsuccessful BIT