Spectrex 20/20SH - Hydrogen Flame Detector - Manual (Page 56)

Spectrex Inc. - SharpEye TM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005
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2.1 Terminal Wiring
The detector contains an EExe chamber consisting of a terminal block (Item 4).
The terminal block is labeled 1 to 6. (See Fig. No.18)
The following describes the function of each electrical terminal of the detector:
There are two options:
RS-485 & 4-20mA Version
Option A (See Fig. No. 19)
Alarm & Fault Relays Version
Option B (See Fig. No. 20)
Power Supply
(Terminal Numbers 1, 2):
Input power is supplied to Terminal No. 1.
RETURN is connected to Terminal No. 2.
Power Supply
(Terminal Numbers 1, 2):
Input power is supplied to Terminal No. 1.
RETURN is connected to Terminal No. 2.
RS-485 (Terminal Numbers 3, 4):
Terminal Numbers 3 and 4 are used for
communication network as specified in
appendix C.
Terminal No. 3 is the positive (+) lead.
Terminal No. 4 is the negative (-) lead.
Alarm Relay (Terminal Numbers 3, 4):
The Alarm output is a NO. SPST
contact at Terminal Numbers 3 and 4.
The contacts are closed at Alarm
Mode.
4-20mA Output (Terminal Numbers 5,
6):
Terminal Numbers 5 and 6 are used for
analog, 4-20mA current output as specified
in paragraph 5.e
Terminal No. 5 is used as output Terminal.
Terminal No. 6 is used as input Terminal.
(see appendix B for more details)
Fault Relay (Terminal Numbers 5, 6):
The Fault output is N.C. SPST contact
at Terminal Numbers 5 and 6. The
contacts are open at Fault condition.
Figure 19: OPTION A
Flame Detector Assembly - Wiring
Diagram (“de version”)
Figure 20: OPTION B
Flame Detector Assembly - Wiring
Diagram (“de version”)