1. ETOP WT-20 wireless wifi thermostat for gas boiler Feactures: • WIFI, ALEXA, GOOGLE ASSISTANT SUPPORT • Large lcd display,mirror black • Sender: 2*AAA batter supply • Receiver: 10A voltage-free output Boiler control system • 5+1+1 days programming with four periods setting 2.ETOP smart radiator thermostat TRV Feactures: • WIFI, ALEXA, GOOGLE ASSISTANT SUPPORT • ZIGBEE, RF, bluetooth protocol • Compact white outlook and easy installation • 7 days program(4 periods/day) • PID precising control • M30 x 1.5 Universal Type Head to body connection 3. ETOP FT-09 modbus RS485 thermostat for fan coil units Feactures: • Touch screen • 2 Pipes or 4 Pipes • Cool,Heat, Fan Mode • 3 Fan Speeds Select & Auto Fan • 0-10v for valve control/ fan speed control • Clock, Keycard, External Sensor (Optional) • Modbus, Bacnet(Optional) • WIFI, ALEXA, GOOGLE ASSISTANT SUPPORT(Optional)  

The working principle of the thermostat - introduction  The thermostat, the full name of the temperature controller (Thermostat) is also called the temperature control switch, temperature protector, divided into two categories: mechanical thermostat and electronic thermostat, it is mainly based on the temperature change of the working environment, the physical deformation occurs inside the switch, so as to produce some special effects, a series of automatic control elements that produce on-on or disconnection actions, or the different principles of the working state of the electronic components at different temperatures to provide temperature data to the circuit to collect temperature data for the power circuit.   The working principle of the thermostat is to automatically sample and monitor the ambient temperature through the temperature sensor, and the control circuit starts when the ambient temperature is higher than the control set value, and the control differential can be set. The thermostat is composed of four mechanisms: a conversion display mechanism, a setting mechanism, a comparison calculation mechanism, and an output mechanism. When the temperature sensor converts the field temperature into an electrical signal and transmits it to the thermostat, the conversion display mechanism of the thermostat converts the electrical signal into a digital display or an analog indication out, and after comparing it with the setting value of the setting mechanism internally, it is output to the controller through the output mechanism, and then the controller controls the heater cooler again.   Advantage of electronic digital room thermostat In terms of appearance, the electronic thermostat has a beautiful appearance, and the keys are easy to operate From the perspective of temperature control, the electronic type can set a temperature and operate automatically, the LCD digital display temperature, intuitive, and also contains programming, power-off memory and other functions, and the temperature control accuracy is more accurate In terms of price, the price of the electronic type is generally more expensive than the mechanical type to more than 2-3 times.   Nowadays, there are fewer mechanical thermostats, and people are more inclined to various popular appearances, such as programming thermostats, WIFI thermostats, LED display thermostats, ink screen thermostats and other more novel elements.  Anything you need, please feel free to contact us anytime.