Automatic precise recording of temperature
G.S. Ross, H.D. Dixon · Journal of Research of the National Bureau of Standards Section C Engineering and Instrumentation · 1960
An apparatu s is descri bed which a u to matically and co n tinuously records small temperat ure changes.The principal co mpo nen ts are a platinum resistance t hermometer, a modified G-2 Muell er vVheatstone bridge, it direct current amplifi er , and a potentio metric, strip-chart recorder.Frequen t zero checkin g is unnecessary because t h e system is extre mely stable.In systems where t he general d epe nd ence of tempemture on ti me is known, a nearly uniform cha nge of 0.00001 °C per minute is easily discernib le over a re ~ordil~g r erio? of ~O minutes or mo re.H owever, the measureme nt of t emp erature at any given lIlstant I S IInll ted by a n i nherent; electro nic noise band of 0.00004 °C.A similar a rrangement, using a t herm oco uple pair a nd a pote ntiometer in stead of t he plittinum t hermometer and t he vVheatstone bridge, is also d escribed .