These are generally used as headers of shell and tube heat exchangers and columns.
This instrument is mainly used to monitor the temperature of liquid in a glass vessel in a typical glass distillation unit.
The instrument consists of a Temperature indicator and a Resistance Temperature Detectors (RTD). The instrument works on 230V, 50Hz power supply. This displays the temperature in degree Centigrades in three and half digits of 12.5mm character height.