BS 3898:1965

Humidity-sensitive device controls admission of moisture from external source. Temperature variation (from point to point); temperature fluctuation (with time); r.h. fluctuation; stability of oven conditions; time of recovery; absence of droplets; reproducibility of oven conditions; rates of heating and cooling. Design; air circulation; sealing; observation window; condensation; manual adjustment of temperature setting; manual adjustment of r.h. setting; manual adjustment of energy controllers; instru ments. Test methods, operation and maintenance.