Spectrex 20/20SI Triple IR (IR3) Flame Detector User Manual

Page 41

Spectrex Inc. - SharpEye

IR3 Flame Detector Manual – TM 20/20I, Rev. (6) August 2004

6.8 Mode Selection
When wiring is completed the operational mode can be selected.
Mode selection is achieved by means of 3 DIPswitches listed below:
SW1 - Function switch – Fig. 12 Item 7 (see table 6)
SW2 - Address switch – Fig. 12 Item 8 (see table 9)
SW3 - Alarm Delay switch – Fig. 12 Item 9 (see table 10)

Function Switch (SW1):
Modes of operation are selected by DIPswitch (SW1) (Item 7) according to the
selection table in paragraph 4.3.1.

Address Switch (SW2):
The detector has the capability of acting as an addressable device.
The address switch (Item 8) provides 64 addresses, which can be used by the RS-
485 communications link as described in paragraph 4.3.2.

Alarm Delay Switch (SW3):
An Alarm Delay may be required for certain applications. The detector has an
Alarm Delay switch (SW3) (Item 9), permitting time delays from 0 to 3, 5, 10, 15,
20 and 30 seconds respectively (See table 10).

1 Function Switch (SW1): Set all eight (8) switches of SW1 to their appropriate

settings (ON/OFF), to achieve the required functional mode (See paragraph
4.3.1).

2 Address Switch (SW2): Choose the address number from 0 to 63 for the

detector and set switches 1-6 according to the selection table at paragraph
4.3.2
Note

: When a multi detector installation is used with RS-485 communication,

then each detector must have an individual address.

3 Alarm Signal Delay Switch (SW3): Set SW3 to the appropriate position to

achieve the required time delay. See paragraph 4.3.3.

4 Verify that the “O” Ring is in its groove in appropriate position on the back

cover.

• Close the detector

• Connect the housing to the cover using the alignment pin on the back

cover.

• Tighten the four (4) socket-head screws to secure the detector housing

to its back cover (tightening torque 1 Kg * M).

5 Install the four (4) set-screws that protect the socket-head screws.

The Detector is now wired, assembled and its operational mode properly set.