through an active circuit such as a transistor network memory chip or other identification device furthermore it will be understood by a skilled artisan that a number of different circuit configurations can be implemented that allow the oximeter sensor circuit 100 to include an information element for example the emitter 105 and the information element may each have individual electrical connections as mentioned above the resistor 115 is preselected such that at low drive voltages it is the only circuit element sensed by the oximeter on the other hand the resistor 115 can also be preselected be of a sufficiently high value that when the drive voltage rises to a level sufficient to drive the emitter 105 the resistor 115 is effectively removed from the oximeter sensor circuit 100 thus the resistor 115 does not affect normal operations of the emitter 105 in summary an information element may form an integral part of the oximeter sensor circuit 100 by providing valuable information to the attached oximeter fig2 a and 2b illustrate a conventional disposable sensor 200 the disposable sensor 200 includes an adhesive substrate 205 having an elongated center portion 210 with front and rear flaps 215 and 220 extending.