1.The maximum deep it is allowed in water is 5m from its center of impeller;
2.The trans medium´s temperature shouldn´t be higher than 40℃
3.The trans medium´s PH scope is from 4～10；                       
4.The kinematics viscosity of the trans medium is from 7×10^-7～23×10^-7m²/s
5.The maximum density of the trans medium is 1.2×10³kg/m³