•
Electronic circuitry
The detector can be set to perform the BIT in the following modes:
•
Automatically and manually
•
Manually only
BIT operation
The BIT is intended to check optical integrity and electronic circuitry. 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 if the BIT differs from the current status.
Note
In BIT Fault status, the detector can continue to detect a fire in most cases.
Automatic BIT
The detector automatically performs a BIT every 15 minutes. A successful BIT sequence
does not activate any indicator. The BIT interval can be modified if required by the
customer using the RS-485 Modbus
®
Manager or HART
®
communicator. In case of a BIT
fault, this sequence continues until a successful BIT occurs, when the detector resumes
normal operation.
•
As result of
successful
automatic/manual BIT, the fault relay remains
energized
.
•
As result of
unsuccessful
automatic/manual BIT, the fault relay
de-energizes
.
Manual BIT
You can initiate manual BIT using the Modbus
®
Manager or HART
®
communicator.
Connecting terminal 3 to ground also initiates manual BIT. Alarm duration during manual
BIT is configurable using the Modbus Manager or HART communicator.
Initial setup
Reference Manual
December 2021
00909-0100-4975
28
Spectrex.net
Summary of Contents for SharpEye 40/40C Series
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Page 10: ...Introduction Reference Manual December 2021 00909 0100 4975 10 Spectrex net ...
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Page 42: ...Reference data Reference Manual December 2021 00909 0100 4975 42 Spectrex net ...
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