In Terminator 2, The Terminator sees himself in a mirror while he runs a diagnostic, during which you can see he is a Cyberdyne Systems Series 800 Model 101 Version 2.4 Terminator.
Additionally, there is a scene that was cut from the movie where Sarah, John and Arnie end up at the ranch of one Travis Gant. There is some dialogue between Sarah and Gant as she tries to persuade him to help, then:
SARAH: Tell him what you are.
TERMINATOR: Series 800 terminator. Model 101. Cyborg tactical infiltrator.
Again identifying him as a Series 800 Model 101.