KRM-X-2-MOD 0.6

Oppermann KRM-X-2-MOD 0.6
24 V AC/DC Modbus, for controlling fans and for ventilation monitoring

incl. sampling tube LKR-X 0.6 m

• VdS approval (G219046/G219053)
• Patented single-tube air measurement system
• Contamination display in % and message at 70 %
• Electronic airflow control
• Reset button in the housing can be operated from the outside
• Remote reset option via terminals
• Long service life, alarm threshold tracking
• Bus interface RS485 (only -MOD/ -BAC)

Technical data

Detector type: Scattered light RM 3.3-X (ALN-E)
Power supply KRM-X-1/KRM-X-1-MOD/KRM-X-1-BAC:
230 V AC ± 10 %, 50/60 Hz
Power supply 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: potential-free
Alarm relay latched: 1 changeover contact, 8 A, 250 V AC or 24 V DC
1 N.C. contact, 8 A, 250 V AC or 24 V DC
Contamination relay: 1 N.C. contact, 6 A, 250 V AC or 24 V DC
Operating temperature: -20 °C - +50 °C
Permissible flow: 1 - 20 m/s
Permissible humidity: 10 - 95 % non-condensing
Protection class: IP 65
Approvals/tests: VdS approval G219046, G219053, DIN EN 54-27
LED Display: Contamination level %, flashes > 70 %
LED in housing: green operation, blue no airflow, yellow fault, electronics, smoke detector defective, red smoke alarm, incl. contamination > 99 %, flashes when attempting to unlock if the detector chamber is not yet empty
Housing: ABS
Dimensions: approx. 271 x 172 x 85 mm (L x W x H)
Cable gland: 3 x M16

Function

The KRM-X duct smoke detector was developed for smoke detection in ventilation ducts. It represents the combination of a smoke detector with an adapter system whose measuring tube and housing have been specially adapted for optimal airflow 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 back into the air duct via the detector chamber. When smoke is detected, the detector reacts immediately and triggers an alarm. Over time, the detector becomes contaminated. Due to the alarm threshold tracking, the sensitivity remains the same until total contamination. From 70 % contamination, the detector triggers and signals this by flashing. If the detector is not replaced, a smoke alarm will be triggered from 99 % contamination. The contamination level is signaled on a two-line LED display; at > 70 %, this flashes and the "dirt" relay drops out. To verify functionality, the device is equipped with an electronic airflow monitoring system, which illuminates a blue LED when the flow is < 1 m/s. The fault LED lights up if the smoke detector or the electronics are defective, as well as if the smoke detector is missing. The smoke alarm must be unlocked with the reset button. The function test is also possible with the same button. Actuation acts like a smoke alarm. Furthermore, the same function is achieved with a restart or if the bridge between terminals 9 and 10 is opened (remote unlocking).