5 (a) Whilst on 'seawatch' you observe that the Oil Mist detector(OMD) in the engine room has triggered an alarm; and in feeling the crankcase doors on the bottom platform, you find that the unit in question feels warmer than the rest. What pre-emptive action will you take as Watch-keeper to bring the situation under control.

(b) Draw a simple line diagram of a 'OMD' and explain it's working.