BA Building Automation System Sensor What?

【sensor】

The sensor is the primary device in the automatic control system, which directly contacts the measured object. Its role is to feel the changes in the measured parameters and to signal the appropriate.

There are generally three requirements when selecting a sensor: high accuracy, high stability, and high sensitivity.

1. Temperature sensor: The main contact temperature sensor used in building engineering, such as thermal resistance, thermocouple, PTC silicon sensor, etc., because the temperature measuring component and the measured medium need to be fully heat exchanged, the measurement is often accompanied by time. It lags. For example, when the Pt1000 has a resistance of 1000 Ω at 0, the resistance decreases with increasing temperature, the sensitivity is generally 3 to 4 Ω/K, and the response speed is generally 15 to 30.

2. Pressure sensor: A commonly used electric pressure sensor converts the change of the measured pressure into various electrical quantity changes such as resistance and inductance, thereby achieving indirect measurement of pressure. Commonly used are differential pressure switches, gauge pressure sensors, static pressure sensors, and the like.

3. Flow sensor: The electromagnetic flowmeter is commonly used. It is known from Faraday's law of electromagnetic induction that there is an induced electromotive force in the conductor that moves and cuts the magnetic field line in the magnetic field. This induced electromotive force has a linear relationship with the volume flow of the fluid.

4. Humidity sensor: used to measure the relative humidity of indoor air.

5. Liquid level sensor: used to control the upper and lower liquid levels of water tanks, pools, etc.

【Actuator】

In the automatic control system, it accepts the control signal output by the controller and converts it into linear displacement or angular displacement to change the flow cross-sectional area of ​​the regulating valve to control the material or energy flowing into or out of the controlled process, thereby realizing the process parameters. Automatic control

1. damper actuator: used to control the damper installed in the fresh air and return air, which can be used for both switch control and opening control. The actuator is equipped with a universal clamp that can be clamped directly to the drive shaft of the damper and has a manual reset button that can be manually adjusted in the event of a fault. Actuators with different button moments can be selected depending on the size of the cross section of the duct.

2. Water pipe valve actuator: It is used with the valve. There are two types of switch type and regulation type. The switch type has a large diameter. It is used to control the opening and closing of various process pipes in various hot and cold stations, and between various working conditions. Switching, etc.; the adjustment type is mainly used to control the flow rate. In the air conditioning unit, the return water flow rate and the steam humidification flow rate are controlled according to the temperature and humidity setting value of the controller, so that the temperature and humidity are maintained at the set value.

[Field Controller (DDC)]

The DDC is a controller for monitoring and controlling the electromechanical equipment in the system. It is a complete controller with the necessary hardware and software to perform independent operation without being affected by network or other controller failures. Controllers that meet control requirements and quantities are provided based on different types of monitoring points. Each DDC has an expansion or margin of 10-15% points.

The controller consists of the following requirements:

(1) Programmable DDC with 32-bit or 16-bit microprocessor;

(2) It has the ability to operate independently or networked away from the central control unit;

(3) with power module

(4) has a communication module

(5) DDC has a real-time change status of each digital input and output point in the template LED. When the external power is cut off, the DDC backup battery can ensure that the data in the RAM is not lost for 60 days.

(6) When the external power is re-supplied, the DDC can automatically resume normal operation without manual intervention.

(7) When the data stored in the DDC is abnormally lost, the user can rewrite the data to the DDC controller through the on-site standard serial data interface and through network operation.

(8) DDC's operating procedures and applications are written in PPCL high-level language.

(9) The preparation and modification of the DDC program can be performed either on the central station or through a portable device.

(10) When the DDC is disconnected from the outside and the backup battery is lost, it can store its proper program.

(11) The acquisition accuracy of the DDC matches the accuracy of the sensor.

(12) Working environment: temperature 0 degrees to 50 degrees, relative humidity 0-90%

(13) Power supply: AC220V, 10%, 50HZ.

DDC has the following functions: Timed start and stop adaptive start/stop automatic amplitude control demand forecasting control event automatic control scanning program control and alarm processing trend recording comprehensive communication capability

Central monitoring station: The central management station system consists of a PC host, a color large-screen display and a printer. It is the core of the BAS system and can be directly connected to the Ethernet. The electromechanical equipment monitored in the entire building is centrally managed and displayed here. The built-in working software provides the operator with a pull-down menu, man-machine dialogue, and dynamic display graphics to provide users with a very good, easy-to-learn interface. The operation is simple, the operator does not need any prior software knowledge, and can manage the entire control system through mouse and keyboard operations.

Disposable Vape

Disposable Vape,Disposable Vape Flavours,Disposable Vape Fume,Disposable Vape Flum

Lensen Electronics Co., Ltd , https://www.lensenvape.com