Product Overview
TM40/40L Rev. (Ag), February 2019
33
•
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.
2.6.3
Built-In-Test (BIT)
The detector’s Built
-In-Test (BIT) also checks the following:
•
Electronic 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
.
2.6.3.1
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 detector
’
s status changes (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.
2.6.3.2
Automatic BIT
The detector automatically performs a BIT every 15 minutes. A successful BIT
sequence does not activate any indicator.
All outputs of BIT results function as described in Table 9 and