A peritoneal dialysis apparatus comprising: a patient tube configured to receive dialysis fluid from a source of dialysis fluid; at least one pump configured to move dialysis fluid from the source to the patient tube during a priming sequence; a priming sensor including a housing having a recessed section configured to accept a portion of the patient tube, the recessed section of the housing including a first side including a first conductive plate, a member including a second conductive plate, the member being moveably connected to a second side of the recessed section and configured for a desired movement upon insertion of the portion of the patient tube into the housing of the priming sensor, and a third side opposing the first side, the third side including a third conductive plate disposed across from a top portion of the first conductive plate, and a fourth conductive plate disposed across from a bottom portion of the first conductive plate; a first capacitive sensor positioned and arranged to measure a first capacitance between the first conductive plate and the third conductive plate; a second capacitive sensor positioned and arranged to measure a second capacitance between the third conductive plate and the fourth conductive plate; and a processor configured to operate with the at least one pump, the first capacitive sensor, and the second capacitive sensor, the processor configured to use the measured second capacitance to determine a first transition between (i) a no-tube state and (ii) a dry tube state, use the measured first capacitance to determine a second transition between (ii) the dry tube state and (iii) a wet tube state, cause the at least one pump to pump the fluid through to the patient tube for the priming sequence after the dry tube state is determined, and transmit a message indicative that the patient tube is primed after the wet tube state is determined. a patient tube configured to receive dialysis fluid from a source of dialysis fluid; at least one pump configured to move dialysis fluid from the source to the patient tube during a priming sequence; a priming sensor including a housing having a recessed section configured to accept a portion of the patient tube, the recessed section of the housing including a first side including a first conductive plate, a member including a second conductive plate, the member being moveably connected to a second side of the recessed section and configured for a desired movement upon insertion of the portion of the patient tube into the housing of the priming sensor, and a third side opposing the first side, the third side including a third conductive plate disposed across from a top portion of the first conductive plate, and a fourth conductive plate disposed across from a bottom portion of the first conductive plate; a first side including a first conductive plate, a member including a second conductive plate, the member being moveably connected to a second side of the recessed section and configured for a desired movement upon insertion of the portion of the patient tube into the housing of the priming sensor, and a third side opposing the first side, the third side including a third conductive plate disposed across from a top portion of the first conductive plate, and a fourth conductive plate disposed across from a bottom portion of the first conductive plate; a third conductive plate disposed across from a top portion of the first conductive plate, and a fourth conductive plate disposed across from a bottom portion of the first conductive plate; a first capacitive sensor positioned and arranged to measure a first capacitance between the first conductive plate and the third conductive plate; a second capacitive sensor positioned and arranged to measure a second capacitance between the third conductive plate and the fourth conductive plate; and a processor configured to operate with the at least one pump, the first capacitive sensor, and the second capacitive sensor, the processor configured to use the measured second capacitance to determine a first transition between (i) a no-tube state and (ii) a dry tube state, use the measured first capacitance to determine a second transition between (ii) the dry tube state and (iii) a wet tube state, cause the at least one pump to pump the fluid through to the patient tube for the priming sequence after the dry tube state is determined, and transmit a message indicative that the patient tube is primed after the wet tube state is determined. use the measured second capacitance to determine a first transition between (i) a no-tube state and (ii) a dry tube state, use the measured first capacitance to determine a second transition between (ii) the dry tube state and (iii) a wet tube state, cause the at least one pump to pump the fluid through to the patient tube for the priming sequence after the dry tube state is determined, and transmit a message indicative that the patient tube is primed after the wet tube state is determined.