Planar thick film thermistor of 1 mm × 1 mm dimension was screen printed using the developed thermistor paste composition on to a 1 square inch alumina substrate (96%). Pre-fired lead free silver electrodes were used for the contact purpose. The printed patterns were dried and subsequently fired in the four zone thick film firing furnace (BTU make)at 850◦C at dwell of 15 min using the firing profile of 60 min. Thefired film thickness was 25 ± 5 m which was measured by Tally surf thickness profiler.