KRM-X® Duct Smoke Detector
Fire Protection | Data sheet No. 41350 | Version 01-2019 | 1 | 10
Technical Data
Detector type: RM 3.3-X (ALN-E)
scattered light detector
Supply voltage: KRM-X-1/KRM-X-1-MOD/
KRM-X-1-BAC:
230 V AC ± 10 %, 50/60 Hz
Supply voltage: KRM-X-2/KRM-X-2-MOD/
KRM-X-2-BAC:
24 V AC (16 – 27,6 V AC) or
24 V DC (21,6 – 27,6 V DC)
Rated current: KRM-X-1 /KRM-X-1-MOD/
KRM-X-1-BAC: 30 mA
KRM-X-2/KRM-X-2-MOD/
KRM-X-2-BAC: 120 mA
Relay outputs: oating
Alarm relay locked: 1 changeover contact, 8 A,
250 V AC or 24 V DC
1NC contact, 8 A, 250 V AC or 24 V DC
Contamination relay: 1 NC contact, 6 A,
250 V AC or 24 V DC
Operating temperature: -20 °C – +50 °C
Permissible ow: 1 – 20 m/s
Permissible humidity: 10 – 95 % non-condensing
Protection type: IP 65
Certication/Approvals: VdS approval G219046, G219053
DIN EN 54-27
LED display: % contamination level:
ashes at > 70%
LED in housing: green operational
blue lack of airow
yellow failure, electronics,
smoke detector defective
red smoke alarm including
contamination > 99% ashes
at attempts to release when
detector chamber is not yet
cleared
Adapter housing: ABS
Air measuring tube: aluminum/plastic
shortest length 160 mm
standard length 600 mm
maximum length: 3009 mm
Dimensions: approx. 271 x 172 x 85 mm (L x W x H)
Cable gland: 3 x M16
• VdS approval (G219046, G219053)
• Patented single tube air sampling system
• Contamination display in %
and signaling at 70 %
• Electronic air ow control
• Externally operable reset button in housing
• Remote reset option via terminals
• Long service life, alarm threshold tracking
• Bus interface RS485 (-MOD/-BAC only)
Accessories
Mounting bracket: KS-X (for insulated / circular ducts)
KS-X (for insulated / circular ducts
in combination with WDG-X)
Housing: WDG-X protective insulating housing
with alarm display for outdoor installation
Function
The KRM-X duct smoke detector is designed for smoke detection
in ventilation ducts. It is a combination of a smoke detector and
an adapter system whose measuring tube and housing have
been specially adapted for optimal airow through the smoke
detector.
The multi-chamber measuring tube in the air duct carries the air
within the air duct along the entire length of the tube, through
the detector chamber and back into the air duct. Upon detec-
tion of smoke, the detector reacts immediately and triggers an
alarm. Over time, the sensor becomes contaminated. Detector
sensiti vity remains constant up to complete contamination due
to alarm threshold tracking. The detector triggers from 70 % con-
tamination upwards, indicating this by ashing. If the detector is
not replaced, a smoke alarm is triggered at 99 % contamination.
The contamination level is indicated in a two-line LED display,
which begins to ash at > 70 % contamination. At the same time
the “contamination” relay drops out.
Operability is veried by electronic airow monitoring, with a
blue LED lighting up at < 1 m/s. The failure LED lights up when the
smoke detector or the electronic system is defective, and in the
absence of a smoke detector. The smoke alarm must be released
with the reset button. The same button can be used to perform
a functionality test. This test simulates a smoke alarm. The same
function is activated on restart, as well as when the bridge circuit
between terminals 9 and 10 is opened (remote release).
Modbus
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