Oil/water alarm unit ÖWU

  • Combination probe for determination of leaking medium oil and water
  • For storage rooms, manholes, drip pans and pumps
  • With fail-safe mode
  • With visual/audible alarms, Test/Acknowledge buttons and relay output
  • EnOcean ready: Smart Home-enabled – simply plug the EnOcean wireless module TCM 320 onto the PCB of the device


For visual and audible alarms if liquids with a flash point of > 55 °C are detected. Suitable for the following media: water, fuel oil, diesel fuel or low-viscosity lubricating oils, motor oils, gearbox oils or hydraulic oils, vegetable oils and transformer oils.


Alarm unit in wall mounting housing for early detection of accumulations of liquids. ÖWU consists of a control unit with visual/audible alarm, Test and Acknowledge buttons, two relay outputs as well as a combination probe with photoelectric and conductivity sensors. An integrated microprocessor determines whether the detected medium is oil or water. The probe is mounted at the lowest point of the object to be monitored. The alarm is triggered when the probe comes into contact with liquid. The audible alarm can be muted with the Acknowledge button. The visual alarm is cleared once the leak has been removed. The Test button allows you to simulate an alarm condition in order to perform a function check. With fail-safe mode: Alarm is triggered if the probe fails. The two voltage-free relay contacts are provided for connection of additional external alarm equipment or additional alarm units; e.g. 1 relay for water alarm and 1 relay for oil alarm. ÖWU features a fail-safe mode. When the unit is shipped, this is activated; however, it can be switched to eco mode for energy- saving operation. The alarm units are suitable for panel mounting with a mounting frame. A sealing kit (IP 54) is available for rough application conditions. Alarm units with the EnOcean-ready label can be integrated into your existing building automation systems at a later point in time. To do so, plug the EnOcean wireless module into the EnOcean interface (PCB of the device). The AFRISO gateway in conjunction with additional AFRISO products with EnOcean wireless technology allow you to configure a whole range of fully customisable, extensible features for the protection of plants and buildings.

Technical specifications

Operating temperature range
Medium: 5/50 °C
Ambient: -10/+60 °C

Wall mounting rail probe
W x H x D: 40 x 300 x 55 mm
Standard probe cable: 1.5 m

Supply voltage
AC 100–240 V

Nominal power
6 VA

Switching output
1 voltage-free changeover contact (water alarm)
1 changeover contact (oil alarm)

Switching over
Eco mode/fail-safe mode

Contact rating
Max. AC 250 V, 2 A

Alarm sound
Min. 70 dB(A)

Wall mounting housing made of
impact-resistant plastic (ABS)
W x H x D: 100 x 188 x 65 mm
Degree of protection: IP 40 (EN 60529)

Scope of delivery
Control unit
Wall mounting rail probe WSS

EnOcean wireless module (can be retrofitted)