Automatic building control in sensor applications

For BAS many physical scene is from the sensor to convert to electricity , and then processed ; If you want a variety of power, such as voltage , current, power and frequency converted to a standard analog output signal , to use electricity transmitter . Building automation systems commonly used Crankcase Position Sensor are temperature sensors, humidity sensors, pressure sensors , pressure sensors, antifreeze switches, flow switches , liquid level switchesReal-time monitoring and control system is the control sensor data sources , its stability and accuracy, and precision control results directly affect the control system , but also affect the energy consumption of electrical and mechanical equipment in the building . Engine Water Temperature Sensor selection , the need to measure real-time physical data collected species live , the sensor requires environment , DDC acceptable signal type, measurement range and accuracy , and many other factors to consider . Different measurement objects are: water , steam, air , etc. : Request environment : indoor , air duct, watercourses and so on. Here are several common sensor :Common temperature sensor, temperature sensor for measuring the temperature of the scene . Installation form: indoor and outdoor , duct , immersion , flue type, surface type and so on. Common temperature sensor elements are: silicon material , nickel thermal resistance, heat resistance training , thermal power suits, these elements connected in a bridge -type , once the temperature changes , the bridge voltage signals detected. Since the application on different occasions , the humidity sensor is also divided into common type , the transmission signal indoor, outdoor , duct and also includes an analog signal , such as waterways , common sensing element with platinum resistance, thermal resistance.Humidity sensors are used to measure air humidity. Installation forms are also within the premises , outdoor , duct type. Such capacitive sensors such as humidity sensor , temperature changes caused by changes in the capacitance value , the change signal may be sent. Also a loose polymer resistive humidity sensor measuring element. When the humidity sensor in the air relative humidity , the output signal is generally an analog signal output by the transmitter .