Infusion pump

An infusion pump operable with a syringe having a syringe barrel and a syringe plunger moveable within the syringe barrel, the infusion pump comprising:

• a housing including
• a compartment structured to receive the syringe and defining a wall, and
• a syringe clamp moveable towards and away from the wall, the syringe contacting the syringe barrel when the syringe clamp is moved towards the wall,
• a drive mechanism supported by the housing, the drive mechanism structured and arranged to contact and end of the syringe plunger so as to be able to move the syringe plunger within the syringe barrel;
• and
• a syringe barrel size sensor including
• a magnet operably coupled to the syringe clamp, and
• a sensing member supported by the housing and configured to generate an output indicative of a magnetic field associated with the magnet, and
• software installed on the pump and configured to use the output to determine a size of the syringe barrel received by the compartment.