Duct Smoke Sensor KRM®
Technical Data
Sensor: Scattering RM 3.3 (ALK-E)
Supply voltage KRM-1:
230 V AC ± 10 %, 50/60 Hz
Supply voltage KRM-2/KRM-2-MOD:
24 V AC/DC +15 % / -10 %
Rated current: KRM-1: 30 mA
KRM-2/KRM-2-MOD: 120 mA
Relay outputs: oating
Alarm relay locked: 1 changeover contact, 8 A,
250 V AC or 24 V DC
1 NC, 8 A, 250 V AC or 24 V DC
Contamination relay:
Operating temperature:
Permissible humidity:
Protection class:
(water resistant housing)
Approvals:
Sensing chamber and
air duct frames: VdS approval G210059
Tested:
according to FprEN54-27
LED display:
at > 70 %
LED in housing:
blue lack of air ow
yellow failure, electronics,
smoke detector defective,
low voltage
red smoke alarm, including
contamination > 99 %,
ashes at attempts to release
when the sensing chamber is
not empty
Adaptergehäuse: ABS
Air measuring tube:
shortest length 160 mm
standard length 600 mm
Dimensions:
Screw connection:
% contamination level ashes
257 x 166 x 77 mm (L x W x H)
1 NC contact, 6 A, 250 V AC or 24 V DC
-10 °C - +50 °C
10 - 95 % non-condensing
IP 54, IP 65 with WDG
green operating
Aluminium / plastic
3 x M16
• VdS certication (G210059)
• Patented single tube air sampling system
• Contamination display in %
and signalling at 100 %
• Electronic air ow control
• Externally operable reset button in the
housing
• Remote reset option via terminals
• Long service life, low contamination
Accessories
Mounting bracket: KS (for insulated / circular ducts)
Housing: waterresistant housing for outdoor
installation and increasing protection
class to IP 65
Function
The KRM duct smoke detector is designed for smoke detection
in ventilation ducts. It constitutes a combination of a smoke
detector with an adapter system, whose measuring tube and
housing have been specially adapted for optimal air ow through
the smoke detector.
The multi-chamber measuring tube in the air duct transports the
air within the air duct along the entire length of the tube, through
the sensing chamber and back into the air duct. Upon detection
of smoke, the sensor reacts immediately and triggers an alarm.
Over time, the sensor becomes contaminated. Because of alarm
threshold tracking, the sensitivity up to total pollution remains
the same. From 70 % contamination upwards, the sensor is triggered and indicates this by ashing. If the sensor is not replaced
the smoke alarm is triggered at 99 % contamination.
The contamination level is indicated in a two-line LED display; at
> 70 % it ashes.
To verify operability, the device is equipped with electronic air
ow monitoring, which lights a blue LED at < 1 m/s. The failure
LED illuminates when the smoke sensor or the electronics are
defective, in the absence of a smoke sensor, and with shortcircuits or cable breakage.
The smoke alarm must be released with the reset button.
A functionality test is also possible with the same button.
The operation functions like a smoke alarm.
Furthermore, the same function takes place on restart or when
the bridge circuit between terminals 9 and 10 is opened (remote
release).
Fire Protection | Data sheet No. 41300 | Version 01-2011 | 1 | 8
Duct Smoke Sensor KRM
10
9
11
12
13
8
6
5
7
1
14
Electrical connection
Power supply
230 V AC
Test/Reset
1
2
3
4
9
10
11
12
13
14
15
16
17
4
2
3
Power supply
230 V AC
Smoke alarm
Service signal
Contamination
14
11
9
10
Smoke alarm
Test/Reset
green
red
yellow
13
12
1 Adapter plate with gasket
2 Patented measuring tube (max. length 3 m)
3 End cap
4 Rubber bushing
(only for insulated or circular ducts)
5 Lower housing with seal
6 Electronics
7 Optical smoke sensor
8 Upper casing with seal
9 Red LED: alarm / reset button
10 Yellow LED: interference
11 LED display: % of sensor contamination
12 LED green: in operation
13 LED blue: air ow under 1 m / s
14 Opening for test gas
15 Air duct
10
11
12
13
14
15
16
17
1
2
3
4
9
Power supply
230 V AC
Smoke alarm
Smoke alarm
Service signal
Contamination
Power supply
24 V AC/DC
Test/Reset
green
Test/Reset
red
yellow
blue
Power supply
24 V AC/DC
Test/Reset
KRM-2-MOD, 24 V
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
KRM-1
Bus B
Bus B
Bus A
Bus A
Power supply
24 V AC/DC
Smoke alarm
Smoke alarm
Service signal
Contamination
Test/Reset
blue
green
red
yellow
KRM-2, 24 VKRM-1, 230 V
KRM-2
Programming the Bus address for the KRM-2-Mod:
Press buttons T3+T4 on the circuit board (to the right, next to the
display) at the same time, so that the display changes from contamination level to show the bus address (the display will ash).
Press button T3 or T4 to adjust the desired address (1-99). The last
set bus address is automatically saved. The display resets automatically after 3 seconds or by simultaneously pressing T3+T4.
Contact depictions are with the
power o (alarm)
KRM-2-MOD
Notes: The oating switching contacts (terminals 11-17) are uniformly assigned to an installation category according to EN 60730-1.
blue
These switching contacts are only to be used for 230 V AC or 24 V AC/DC, a combination is not permitted.
A mixed connection of safety extra-low voltage (SELV) and low voltage must not occur. The assembly may only be operated on one mains
phase.
2 | 8 | Fire Protection | Data sheet No. 41300 | Version 01-2011
Duct Smoke Sensor KRM
Installation Instructions
Install the detector where ow meters, etc. are normally xed,
so that the air ow can run in a laminar manner with the measuring tube. Follow the installation instructions. All work must be
carried out by suciently qualied craftsman.
Current local rules and regulations (e.g. building regulations,
elecrical/VDE guidelines, etc.) are to be observed. Installers
and operators are required to be adequately informed before
operation. We assume no liability for misprints and changes
after printing. Compliance with operating and installation
instructions is also included within the regulations of intended
use. We assume no liability for damages caused by improper
use. Operating licenses and guarantees and all warranty claims
will be voided in the event of unauthorized modications or any
tampering with the device.
Maintenance
Targeted maintenance can be carried out since the smoke
detector is equipped with a contamination indicator. From a
70 % contamination level or higher the smoke sensor must
be changed. There is a contact available for this signal, and it
should be connected to the automation station.
Accessories
Splash-proof housing (type
WDG) for outdoor installation
to prevent condensation. The
housing is lined with insulating foam.
Mounting bracket
Type KS is required if the duct smoke sensor must be mounted on round air ducts. The
bracket can also be used with
insulated rectangular ducts.
For this the adapter is mounted with the air measuring
tube before insulation.
Installation and positioning
1.
We recommend that the duct smoke detector be installed at the
same distance to heating, cooling and humidity equipment and
be mounted similarly to ow sensors. The distance of the smoke
sensor to ttings, valves, lters, etc., should be 3 times the diagonal length of the cross-section of the duct when going against
the air ow, and 5 times the diagonal length with the ow.
2.
Drill a hole of 43-44 mm in diameter at the intended mounting
location.
Note: Installation of the TurboTube measuring tube is possible
either from the top, bottom or side of the channel for all duct
cross-sections (for round ducts as well).
Fire Protection | Data sheet No. 41300 | Version 01-2011 | 3 | 8
3.
• Determine how long the measuring tube must be.
The TurboTube measuring tube must be inserted into the
duct at least to the middle of the duct‘s cross-section.
• If necessary, shorten the tube. Minimum length 160 mm.
• Deburr the cutting face and put the end plug back on up
to the stop collar.
Min. 160 mm Attention:
Operation without
end plug not
permitted.
4.
• Determine the direction of ow and t the adapter plate
so that the line on the adapter plate under the text
„Strömungsrichtung“ is parallel to the ow direction.
• Four self-tapping screws serve for attaching it to the sheet
metal duct (not included in delivery).
5. Installation on a rectangular air duct
Installation on a circular air duct
6.
• For mounting on a circular air duct use mounting bracket
type KS and the rubber bushing
rations they can be adapted to a round duct.
. Thanks to the bend perfo-
Duct Smoke Sensor KRM
Mounting
bracket
The type KS mounting
bracket is supplied at.
7. Installation on air ducts with insulation
• Use the rubber bushing and insert it into the Ø 43-44mm
opening in the air duct.
• Install the mounting bracket.
• Insert the assembled adapter plate into the measuring tube
by sliding the measuring tube through the grommet, and
screw the adapter plate onto the mounting bracket using the
4 self-tapping screws. Then the insulation can be installed.
8. Installation outdoors or in a cold environment
• As protection for smoke detectors, which are exposed to the
open air or in a cold environment, there is a special WDG type
housing. This enclosure prevents the warm air in the smoke
detector duct from condensing.
inner
Rubber bushing
Mounting bracket Insulation
outer
4 | 8 | Fire Protection | Data sheet No. 41300 | Version 01-2011
9. Installing the housing with the sensor
• Attach the housing bottom part with the electronics and sensor
to the adapter plate. The housing can be attached at increments of 90 °. The direction of the housing has no eect on the
measurement result. You can align the housing with the sensor
optimally.
• Check that the seals in the housing upper part are correctly
positioned.
• By snapping on and tightening the upper housing and then
rmly pressing down on the arrow marked on the central cable
area (to ensure that the catch at the lower end of the housing
snaps in correctly) the mounting is complete.
10. Testing the duct smoke sensor
• After completing the installation work, doing proper wiring
and applying power, the duct smoke sensor is operational.
• The green LED (12) illuminates.
• By pressing the alarm/reset button (9), an initial simple
functional test can be made. All LEDs must light up and all the
relays drop out. The units connected to the relays are activated! The display (11) indicates the current degree of sensor
contamination. If the button is released, all LEDs will go out
except for LED (12) which shows the supply voltage, and the
relays activate.
• For testing the smoke sensor the housing must not be
opened. It has a self-closing test opening (14) in the center of
the transparent cover. Use Oppermann test gas spray. Insert
the test spray‘s tube fully into the test opening (appx.1.5mm
deep) and release as much test gas as needed until the smoke
sensor activates. The alarm/reset button lights up, the relays
drop out. The electronics are on alert and locked. To release,
the alarm/reset button must be pressed. At the time of the
reset, the sensor must be free of smoke and test gas. Should
there still be test gas in the chamber a higher degree of contamination will appear. In this case, after some time perform
a reset by disconnecting from the power or by an external
reset.
Duct Smoke Sensor KRM
11. Final review
• Are all screws tight?
• Is the adapter plate properly mounted for the ow direction?
• Are all seals in the correct position?
• In operation, when air ow > 1 m/s the blue LED may not
light up.
Fire Protection | Data sheet No. 41300 | Version 01-2011 | 5 | 8
Duct Smoke Sensor KRM
Display and operation for Duct Smoke Sensor KRM
LED Smoke alarm (red) LED Smoke alarm (red)
LED Failure (yellow) LED Power supply
(green)
LED Alarm (red) and
Alarm / reset button
Failure reset:
Briey press button and release
Alarm reset:
Press button for at least 2 seconds
until the red LED goes out
Display Meaning Comments
Shortly after starting the software version is displayed (4 digits),
Start / calibration
Contamination
in %
00 – 99
e.g. 00 then 17 = Software 0017.
Thereafter, the rotating segment display follows at startup or after a power failure.
Flashes starting at 70 %; at 99 % with display LED alarm.
LED Air ow (blue)
e.g. Missing smoke detector, disrupted communication with the smoke detector,
Failure
88
00 – 99
ashing
6 | 8 | Fire Protection | Data sheet No. 41300 | Version 01-2011
Conrmation
reset / new start
BUS adresse
processor failure.
Failure LED & alarm LED light up at the same time (not on the DIBT version).
Troubleshooting: Change the detector and conrm by pressing the alarm / reset button.
If alarm / reset button is pressed for more than 8 seconds, or if terminal 9 / 10 is open (missing
bridge circuit or remote reset). Display goes out after releasing the alarm / reset button
Display only with MOD versions after pressing the address buttons T3 / T4 directly on the
circuit board.
LEDs Meaning Comments
Reset after failure:
Briey press alarm / reset button. KRM immediately restarts.
Alarm / reset
(red)
Smoke alarm or
failure (not on
the DIBT version)
Reset after alarm:
Press and hold the alarm / reset button for at least 2 seconds until the red alarm LED in the
button goes out. Do not release it until then. KRM will start again only after release. As long as
the alarm / reset LED ashes when the button is pressed, the smoke sensor is still lled with test
gas / test spray / smoke, and can not be reset. In that case blow the sensor out or wait.
Duct Smoke Sensor KRM
Failure
(yellow)
Smoke alarm
(2 x red)
Power
(green)
Air ow
(blue)
Defective circuit
board or missing
smoke alarm
Smoke alarm
or contamination
99 %
Supply voltage
is on
Air ow is too
low
Check / replace circuit board or smoke detector RM 3.3 (ALK-E)
Red LEDs directly on the smoke detector RM 3.3 (ALK-E). Red LEDs directly
on the smoke detector RM 3.3 (ALK-E). LEDs permanently on until reset has taken place.
Green LED lights up if supply voltage is on
Blue LED lights up when air ow is too low. Check smoke detector position in the duct, check
sampling tube (TurboTube) for contamination / clean if necessary.
Behavior of the alarm relay and fault relay and displays, plus reset options
Smoke alarm Device failure / missing detector…
DIBT versions
KRM-1-DZ / KRM-2-DZ
Alarm relay
11 / 12 / 13
Relais Alarm
14 / 15
LED
Alarm / Reset
Relay failure
18 / 19
LED failure Does not light up Does not light up Lights up Lights up
Alarm reset or
failure reset
Drops out Drops out Does not drop out Drops out
Drops out Drops out Does not drop out Drops out
Lights up Lights up Does not light up Lights up
Does not drop out
Not with power
interruption!
It is mandatory to use
the alarm button or ter-
minal 9 / 10 provided that
sensing chamber is free.
KRM-1 / KRM-2
KRM-2-MOD
---------
Not equipped
With power interruption,
alarm button or with
terminal 9 / 10 provided
that sensing chamber
is free.
DIBT versions
KRM-1-DZ / KRM-2-DZ
Drops out
Not with power
interruption!
It is mandatory to use
the alarm button or terminal 9 / 10 provided that
sensing chamber is free +
disturbance has ceased.
KRM-1 / KRM-2
KRM-2-MOD
---------
Not equipped
With power interruption,
alarm button or with
terminal 9 / 10 provided
that sensing chamber
is free + disturbance has
ceased.
Fire Protection | Data sheet No. 41300 | Version 01-2011 | 7 | 8
Dimensions
Duct Smoke Sensor KRM
166
233
77
40
24
70
37.3
L= 160 - 3000 mm
50
Dimensions in mm
Oppermann Regelgeräte GmbH | Im Spitzhau 1 | 70771 Leinfelden-Echterdingen, Germany
Phone +49 711 72 72 35 60 | Fax +49 711 72 80 52 7 | info@oppermann-regelgeraete.de | www.oppermann-regelgeraete.de
8 | 8 | Fire Protection | Data sheet No. 41300 | Version 01-2011 Specications subject to change.
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