It depends upon the internal diameter of the different syringe types. If the Terumo 2.5ml syringe has a smaller internal diameter than the BD 3.0ml syringe, then an under-infusion would result as Geoff has stated.
A syringe driver has a "look-up table" of syringe brands and types and uses this table to translate the linear travel of the plunger mechanism into a volume delivered. If the internal diameter is reduced, the linear travel must be faster to achieve the same delivery rate.
(To be a little more specific, if you halve the internal diameter of the syringe, you must increase the rate of linear travel of the plunger by a factor of four to achieve the same delivery rate.)
Last edited by BSM; 13/11/07 10:38 PM. Reason: Addition