KRM-X-2-DZ 0.16

Oppermann KRM-2-DZ 0.16
24 V AC/DC with DIBt approval, for controlling fire/smoke protection dampers

incl. sampling tube LKR 0.16 m (optionally available with sampling tube 1.5 m or 3.0 m)

Technical Data

Detector type: Scattered light RM 3.3 (ALK-E)
Power supply: 24 V AC/DC +15% / -10%
Rated current: 140 mA
Relay outputs: potential-free
Alarm relay locked:
1 changeover contact, 8 A, 250 V AC 1 normally closed contact, 8 A, 250 V AC or 24 V DC
Contamination relay: 1 normally closed contact, 6 A, 250 V AC or 24 V DC
System fault relay: 1 normally closed contact, 6 A, 250 V AC or 24 V DC
Airflow relay: 1 normally closed 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 54, with WDG IP 65
Approvals/Tests: DIBt approval Z-78.6-200, VdS recognition G210059, FprEN5427
LED Display: Contamination level %, flashes > 70%
LED in housing:
green = operation
blue = missing airflow
yellow = fault, electronics, smoke detector defective
red = smoke alarm, including contamination > 99%, flashes when attempting to unlock if the detector chamber is not yet empty
Adapter housing: ABS
Air sampling tube:
Aluminum/plastic
Shortest length 160 mm
Standard length 600 mm
Dimensions: 257 x 166 x 77 mm (L x W x H)
Connection gland: 3 x M16

Function

The KRM-DZ duct smoke detector was developed for smoke detection in ventilation ducts. It represents a combination of a smoke detector with an adapter system, whose sampling tube and housing have been specially adapted for optimal airflow through the smoke detector.

The air duct sampling tube transports the air within the air duct over the entire length of the tube via the detector chamber back into the air duct. 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 signals dirt. 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, which flashes at > 70%.

To monitor its functionality, the device is equipped with electronic airflow monitoring, which illuminates a blue LED if the flow is < 1 m/s. The fault LED illuminates if the smoke detector or electronics are defective, or if the smoke detector is missing. The smoke alarm or a fault must be unlocked using the reset button. The same button can also be used for a function test.

Actuation acts like a smoke alarm. Furthermore, the same function is achieved on restart if the bridge between terminals 9 and 10 is opened (remote unlocking).