INSTALLATION AND MAINTENANCE INSTRUCTIONS
Single-ended Reflected Type
Projected Beam Smoke Detector
Style 7 Operation:
Paintable Trim Ring:
External Supply (SK-Beam-T only):
Remote Output: (alarm)
Model SK-Beam/SK-Beam-T is a long range projected beam smoke detector
designed to provide open area protection. It is to be used with UL-listed com-
patible control panels only. The detector consists of a transmitter/receiver unit
and a reflector. Smoke entering the area between the transmitter/receiver and
reflector causes a reduction in signal. When the obscuration reaches alarm
thresholds (chosen at the transmitter/receiver unit), the detector generates
an alarm signal. Complete blockage of the beam causes a trouble signal. Slow
changes in obscuration due to a build up of dirt or dust on the lens of the
detector are compensated for by a microcontroller that continuously monitors
16 to 230 Feet (5 to 70 m); 230 to 328 Feet (70 to 100 m) using optional accessory BEAMLRK
25% to 50% Total Obscuration in 6 levels
Level 1 = 25%
Level 2 = 30%
Level 3 = 40%
Level 4 = 50%
Level 5 = 30% to 50% (Acclimate)
Level 6 = 40% to 50% (Acclimate)
30 to 60 Feet (9.1 to 18.3 m)
ALARM - 20 seconds typical
TROUBLE - 30 seconds typical
Beam Blockage (96% or More Obscuration)
Improper Initial Alignment
Self-compensation limit reached (service needed)
In Alignment mode
Integral Sensitivity Test Filter (SK-Beam-T only, requires additional external power supply)
Sensitivity Filter (Incremental scale on reflector)
Local Alarm Test Switch
Local Alarm Reset Switch
Remote Test and Reset Switch Capability (compatible with RTS451/RTS451KEY/RTS151/RTS151KEY)
ALARM - Remote Output, Local LED (red)
TROUBLE - Remote Output, Local LED (yellow) Blink Pattern Indicates Trouble Diagnostics
NORMAL OPERATION - Local LED (flashing green with communication)
ALIGNMENT AIDS - Optical Gunsight (coarse adjustment) 00 to 99 Digital Display (fine adjustment)
SENSITIVITY - Digital Display Readout in Percent Obscuration
On-board isolators provide style 7 operation. (may be disabled via shunts on circuit board)
–22°F to 131°F (–30°C to 55°C);
NOTE: for applications below 32°F (0°C) see Special Applications section of this manual.
10% to 93% RH Noncondensing
3.9 lbs. (1.77 kg)
15˝ × 10.5˝ × 6.5˝ (381 mm × 267 mm × 165 mm)
Wall only without optional accessories
Plug-in Terminal Blocks (12 to 22 AWG)
±10° Horizontal and Vertical
May be painted using enamel or acrylic type paints
15 to 32 VDC
Max. Alarm (LED on):
Max. Trouble (LED on):
VOLTAGE - 15 to 32 VDC
CURRENT - 0.5 A Max.
VOLTAGE - 15 to 32 VDC; NOTE: Output voltage same as device input voltage.
CURRENT - 15 mA maximum; 6 mA minimum; NOTE: Output current is limited by 2.2 kΩ resistor.
2 mA Max. (1 communication every 5 sec., LED flashing, SLC @ 24 V)
8.5 mA Max.
4.5 mA Max.
20 mA Max.
the signal strength and periodically updates the alarm and trouble thresh-
olds. When the self-compensation circuit reaches its limit, the detector gen-
erates a trouble signal, indicating the need for service.
Three LEDs on the detector indicate the current status: a red LED for alarm,
a yellow LED for trouble, and a blinking green LED for standby operation.
Note: The panel controls the status of the red and green LEDs. The local
reset button is accessible by removing the outer paintable trim ring. The
yellow LED will blink in specific patterns to provide a diagnostic aid when
diagnosing the cause of a trouble signal. It will also blink the amount of drift
compensation that has been used at the conclusion of the test. Trouble sig-
12 Clintonville Road, Northford, CT 06472-1610
Phone: 203-484-7161 Fax: 203-484-7118