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Spectrex 20/20R - Single IR Flame Detector User Manual

Page 58

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Spectrex Inc. - SharpEye

TM

Single IR Flame Detector Manual – TM 20/20R, Rev. A January2005

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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 - Terminal No. 1.
RETURN - Terminal No. 2.

Power Supply

(Terminal Numbers 1, 2):

Input power - Terminal No. 1.
RETURN - 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 - positive (+) lead.
Terminal No. 4 - 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”)