Spectrex 20/20L (LB) - UV/IR Flame Detector - Manual (Page 36)

Spectrex Inc. - SharpEye TM UV/IR Flame Detector Manual – TM20/20LB Rev E, August 2004
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6.7 Terminal Wiring (Figures 6,7)
The detector contains a terminal board consisting of two terminal blocks.
The left terminal block is labeled 1 to 6; the right terminal block is labeled 7 to 12.
See Figure 6.
The following describes the function of each electrical terminal of the detectors.
Power Supply:
(Terminals 1, 2)
Input power is supplied to terminal No. 1.
The RETURN is connected to terminal No.2.
Manual Bit Activation: (Terminal 3)
Terminal No. 3 is used for the manual BIT activation. The manual BIT is initiated
by a momentary connection of Terminal No. 3 to the power supply return line.
Alarm Relay:
(Terminals 4, 5, 6)
The Alarm output is a change over contact relay (SPDT)
Terminal No. 4 is the NO relay contact
Terminal No. 5 is the COMMON relate contact
Terminal No. 6 is the NC relay contact
Fault Relay
: (Terminals 7, 8)
The Fault output in NC SPST contact at terminals no. 7 and 8. The contacts are
closed when the detector is in its normal operational condition
Accessory Relay
: (Terminals 9, 10)
The Accessory output is N.O. SPST relay at terminals no. 9 and 10. The
Accessory relay may act in parallel with the Alarm relay to activate another
external device or it may provide a warning signal, depending on the position of
SW1-4.
Note
To protect the dry contacts from voltage surges when connected to
reactive loads (electric motors, sirens, etc.) connect an appropriate
varistor over these contacts.
4-20mA Output: (Terminals11, 12)
As specified in section 5.1.e.
Terminal 11 is used as RETURN terminal (-) (RTN)
Terminal 12 is used as output terminal (+)
See appendix B for more details.