The Interra ITR401-0001 is a KNX water flood detector that reports leak/flood conditions directly on the twisted-pair bus. It uses liquid-conductivity sensing with a probe that extends up to 25 cm, ideal for sump pumps, water heaters, washers, under sinks, computer rooms, warehouses and tanks. When water reaches the probes, the device sends KNX telegrams so visualisation, valves, pumps or notifications can react early — before finishes and equipment are damaged.

The unit is bus-powered (10 mA in alarm), KNX-certified and commissioned in ETS. Local feedback includes a dual-colour LED, optional buzzer and a 1 A @ 24 V DC relay (NO/NC/COM). ETS parameters cover alarm delay, LED/buzzer behaviour, alarm suspend, alarm reset and a module-alive beacon. For a non-bus probe with jumpers, see ITR400-0001.

Key Features — KNX Flood Detector

• Native KNX TP: Early-warning objects via the bus; ETS S-Mode.
• 25 cm probe: Conductivity sensing at floor / drip points.
• Local + relay alert: LED, buzzer and 1 A @ 24 V DC contact.
• Alarm tools: Delay, suspend duration, reset and alive beacon.
• Compact IP20: 55 × 88.1 × 21.6 mm light-grey housing.
• Project stack: Pair with smoke/heat and presence sensors for layered risk.

At a Glance

Specification	Detail
Order code	ITR401-0001
Product type	KNX Water Flood Detector
Power	KNX bus · 10 mA (alarm)
Relay	1 A @ 24 V DC (NO / NC / COM)
Probe length	Up to 25 cm
Dimensions (W × H × D)	55 × 88.1 × 21.6 mm
Protection	IP20 · 0…40 °C operation
Configuration	ETS (KNX certified)

Applications and Related Products

• Leak early-warning: Map group addresses to panels, servers and shut-off logic.
• Conventional companion: ITR400-0001 when only a dry contact is needed.
• Fire detection: ITR403-1001 KNX smoke + heat.
• Occupancy: ITR415-0003 wide-range presence for the same spaces.

Choosing and Commissioning

Mount so the probe reaches the lowest expected water path; keep the IP20 enclosure dry. Connect KNX only (no separate mains). Program with the official .knxprod, set delay/LED/buzzer parameters, then link alarm, lock and reset objects. Full ratings, CAD/Revit and CE files are under Downloads.