Built-In-Test
32
SharpEye
TM
IR3 Flame Detector User Guide
Table 14: Default Function Setup
Detector Default
Setup:
20/20MI-1
20/20MI-3
Sensitivity
20
5
Delay
A
0
Alarm Latch
No
No
Automatic BIT
Yes
Yes
Alarm BIT
No
No
4.4
Built-In-Test
4.4.1
General
The detector
’
s Built In Test (BIT) checks the following:
•
Electronics circuitry
•
Sensors
•
Window cleanliness
The detector can be set to perform the BIT as:
•
Automatically and manually
Or
•
Manually only
4.4.2
Principles
If the result of a BIT is the same as the current status of the detector
(normal or BIT fault), the detector's status is left unchanged. If the result of
a BIT differs from the current status of the detector, the detector
’
s status is
changed (from normal to BIT fault or from BIT fault to normal).
Note
: In BIT fault status, the detector can continue to detect a fire.
4.4.3
Automatic & Manual BIT
4.4.3.1
Manual Bit
This functions in the same way as an automatic BIT except that a successful
BIT will cause the detector to resume its normal operation.
An unsuccessful BIT sequence activates the following:
•
The fault relay is opened.
•
4
–
20mA output indicates BIT FAULT (2mA).
•
The LED flashes (4Hz) at yellow.
•
BIT procedure is performed every 1 minute.
