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TC-IDA161
開/關控制：一種簡單的兩位控制系統(tǒng)，其中
被控制的設備處于完全打開或完全關閉狀態(tài)
沒有中間操作位置可用。
也稱為“兩位控制”。
氣動控制：在空氣中運行的控制電路
并使用機械方式，如
溫度敏感雙金屬或波紋管
控制功能，如啟動噴嘴和
擋板或開關繼電器。控制器輸出
通常操作或定位氣動致動器，
盡管繼電器和開關通常在電路中。
過程：描述可測量的
可變（例如，回風和室外空氣的混合
混合空氣控制回路中的氣流和傳熱
冷卻盤管中的冷水和熱風之間）。
通常與傳感分開考慮
元素、控制元素和控制器。
比例帶：在比例控制器中，控制
受控變量所通過的點范圍
必須通過才能移動終控制元件
其全工作范圍。以百分比表示
主傳感器量程。常用的等效物有
“節(jié)流范圍”和“調(diào)節(jié)范圍”，通常
以工程單位數(shù)量（度）表示
溫度）。
On/off control: A simple two-position control system in which the device being controlled is either full on or full off with no intermediate operating positions available. Also called “two-position control”. Pneumatic control: A control circuit that operates on air pressure and uses a mechanical means, such as a temperature-sensitive bimetal or bellows, to perform control functions, such as actuating a nozzle and flapper or a switching relay. The controller output usually operates or positions a pneumatic actuator, although relays and switches are often in the circuit. Process: A general term that describes a change in a measurable variable (e.g., the mixing of return and outdoor air streams in a mixed-air control loop and heat transfer between cold water and hot air in a cooling coil). Usually considered separately from the sensing element, control element, and controller. Proportional band: In a proportional controller, the control point range through which the controlled variable must pass to move the final control element through its full operating range. Expressed in percent of primary sensor span. Commonly used equivalents are “throttling range” and “modulating range”, usually expressed in a quantity of engineering units (degrees of temperature).
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