The reasons for the increased oxygen content in the deaerator water are:
1.The water temperature is too low or the water volume is too large.
2.The oxygen content of the incoming water is large.
3.Insufficient steam input of deaerator.
4.Deaerator air valve opening is too small.
5.The arrangement of the deaerator steam and water pipes is not reasonable.
6.Leakage inside the sampler, the test is not allowed.