Sensors in boilers: until modern y...

Sensors in boilers: until modern years, control in gas- or oil-fueled boilers has typically consisted of individual temperature sensor controlling the primary heat exchanger temperature and perhaps a bimetal overheat sensor to close the door upon down the system in the occurrence of a major problem. The form of command has mainly been simple on/off of the firing control valve, although a French manufacturer has used a proportional/modulated gas-fueled combination of parts to form a whole controlled by positive temperature coefficient (PTC) thermistors for more than 20 years. (Engineering: Sensors)

Technology Drivers

Improvement in the operation of boilers has been driven through environmental issues, local ...