What kind of hot water boiler with the thermometer is?

In many large dining room, we usually see hot water boiler, under normal circumstances, they are need to burn hot water to 100 ℃, can be used for drinking, can also be another use for it. In order to facilitate understanding the water temperature, therefore, generally in front of the boiler will be fitted with a special thermometer, then hot water boiler is special thermometer is what kind of? Common hot water boiler thermometer can be divided into two kinds, one kind is bimetallic thermometer, also called boiler thermometer, mainly through the nut or flange installation on equipment or pipeline, through the test tube directly detect the medium temperature. Another is the pressure type thermometer, is mainly composed of thermal bag, capillary. Capillary set within the metal hose, thermal package installed at the outlet of medium to be tested. Metal hose shall not be close to hot surface area to avoid affect its accuracy, hose bend less as far as possible, redundant hose rolled into the case, according to the temperature dial may be placed on a lower position for easy reading. Pressure type thermometer is suitable for measuring the temperature of the medium over a long distance, installed in the hot water boiler exit. Both the principle and advantages of the thermometer is different, we can according to the actual need to select the suitable.