The temperatures of the on-column injector
(300OC) and the heater (32OOC) of the detector
line (a stainless steel tube, 1/16 inch O.D. X 6 inches,
between end of column and detector) were maintained
by simple Powerstats, and they consequently varied
by as much as 10°C from the settings. The oven temperature
was linearly programmed at 4-6OC/min over the
range of 100-325 OC by means of a Mylar programming
sheet on which the temperature profile is traced with
silver plastic tape. Temperature spans were controlled
by a step switch and a 10-turn potentiometer that allowed
settings accurate to 0. l OC.