A two phase line is split phase. That's the same as in you home.Hot 1 is 120VAC to Neutral.Hot 2 is 120VAC to Neutral, and is 180 degrees aways from Hot 1.Hot 1 is 240VAC to Hot 2.Neutral is grounded...
There is no such thing as a two phase instrument. There is only single phase and three phase. You can only have:
single phase/ one pole
single phase/ two pole
three phase/ three pole