OST-2000 oil accumulating water announciator can separately monitor oil leakage tank of hydraulic turbine and generator, oil scavenging tank, and bearing oil tank to check whether those oil tanks have accumulated water phenomenon. From this way, it could avoid the accumulating water to affect the governor performance, rust the bearing and rotating ring, which may influence the unit life. It can reduce the devices of the power plate and lower the investment. There are four channels connecting to the accumulating water sensors separately to monitor the four oil tanks. If water accumulation happens in one of the tanks, the device will send alarm signal. The four channels are independently working, each one for checking one oil tank, The alarm signal for the oil tank water accumulation is displayed directly.