Oil-in-Water Monitor / Bilge Alarm Monitor The OMD-24 Bilge Alarm Monitor was designed by Deckma Hamburg GmbH for use in conjunction with 15 ppm Oily Water Separator Systems. The performance and specifications of the OMD-24 comply . The OMD-24 Bilge Alarm Monitor is made up of 2 main components: the Computer Unit and the Measuring Cell. The Computer Unit contains the display PCB with the data logger and the terminals for external connections. The Measuring Cell contains optics and electronics and is connected to the computer unit via a data cable. The Computer Unit and Measuring Cell are mounted separately only.