| The comparison calibration accuracy can be considerably greater than that which can be achieved in any metal block bath. It also has a larger calibration area, that allows more probes to be calibrated and a greater immersion depth which provide a superior thermal environment for probe immersion since air gaps exists between the probe and the medium. Thermal coupling is therefore much better than the alternatives described and as a result of stirring heat distribution is very even throughout the liquid.
Alcohols are used for temperatures below 0°C ,Water is used for 0° to 80°C and oil for temperature upto 300°C, various molten salts and sand baths are used temperatures in excess of 300°C.
Negative temperature bath or ice bath is mainly used for RTD calibration which provides negative temperature for low temperature calibration application.
In this device a compressor & CFC gas is used for cooling purpose. Methanol is used as a medium for temperatures below 0°C. |
