What is a bimetal thermostat? What are the applications of bimetallic thermometers?
Bimetal thermometers are thermometers based on the functional principle that metals expand differently depending on the change in temperature. A bimetal thermometer always consists of two different metal strips that have a different thermal expansion coefficient. The two strips are joined together inseparably and thus form the bimetal strip. When the temperature changes, the different metals expand to different degrees, which leads to a mechanical deformation of the bimetal strip. This mechanical deformation can be detected in a rotary movement. The measuring system works in the form of a helical or spiral tube. This movement is transmitted to the pointer of the thermometer via the pointer shaft, which thus enables the temperature to be measured.
Our leading products are 3/4-inch and 1/2-inch thermostats. The 3/4-inch thermostats maximum current carried by the thermostat can be up to 60 A. It can be applied to electrical equipment with a rated power of 10 KW. The 1/2-inch snap disc thermostat thermal snap switch features a small size, high sensitivity, accurate temperature control, and a rated current of up to 16 A. It can be applied to household electrical equipment with a rated power of 3 KW. The operating principle of the two thermostats is as follows: When the temperature of the heating element rises to the temperature set by the bimetal thermostats, the push rod is pushed through the bending deformation of the bimetal to break the circuit from the surface. Several models of these thermostats come with dual temperature protection. When the temperature control part fails and the circuit cannot be cut off at a certain temperature, backup protection will be started to cut off the circuit when the temperature continues to rise to the temperature set by another set of temperature limits. The temperature can be set according to customers' needs.
In which applications are bimetal thermometers used?
Bimetal thermometers are used in many different industrial applications, e.g. in machine building, in heating technology and in air conditioning and refrigeration technology.
The water heater thermostats are generally used in water heaters. This type of electric water heater thermostat combines auto reset and SPST, namely, a single switch controls a single circuit that manipulates a set of normally closed contact points. As temperature rises, the set of normally closed contact points breaks. But as soon as the temperature drops to a specific level for triggering reset, the contact points will reset to be normally closed. The alternative is auto reset + SPDT configuration. Largely identical to the SPST product, it controls one single circuit which manipulates two sets of normally closed contact points. When the contact points reset, auxiliary contact points will break to disconnect from the power supply.