Spectrex 20/20CTIN-CTIP Flame Detector - Manual (Page 24)

Spectrex Inc. - SharpEye TM CCTV Model Flame Detector Manual – TM 788100, Rev. A January 2005
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4.4 Built In Test
A. General
The detectors’ Built In Test (BIT) checks the following:
• Electronics circuitry
• Sensors
• Window cleanliness
The detector can be set to perform the BIT automatically and manually or
manually only.
B. 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 unchanged. If the result of a BIT differs from
the current status of the detector, the detectors’ 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.
C. Manual BIT only
The BIT is initiated manually by momentarily connecting Terminal No. 3 with
Terminal No. 2. A successful manual BIT activates the following:
• FAULT relay is closed.
• ALARM relay is activated for 3 sec (only when Function Alarm BIT at YES)
• 4-20 mA OUTPUT current will be 15mA only when Function Alarm BIT at
YES
Unsuccessful BIT activates the following:
• FAULT relay is released.
• 4-20 mA output indicates BIT FAULT condition (2 mA).
• POWER LED (yellow) flashes (4 Hz).
Note:
During a MANUAL BIT, if function ‘Alarm BIT’ is in ‘YES’ position, the ALARM
relay will be activated. Therefore, automatic extinguishing systems or any external
devices that should not be activated during BIT should be disconnected.