流量感測在工業界有相當多的應用，其中熱質式流量計因為它良好衡量動態現象的能力、簡單的結構和普遍的適用性，熱質式流量感測技術為量測紊流最可靠的方法之一。本研究目的為建構熱質式流量計自動檢測系統，系統包含PC控制器、自行開發的自動檢測人機介面(HMI,Human Machine Interface)、DAQ訊號擷取卡、PID控制器、流量標準源、溫度標準源、流體加熱器、流量控制馬達、訊號傳送器、儲水槽、測試管路與通訊傳輸裝置。
為達成流量計之自動量程檢測，本研究首先建構一可控制流體溫度與流量大小的穩定測試管路系統，再將熱質式待測計安裝於測試管路內作自動檢測或校正。系統所使用之控制方法為PID控制，藉由溫度標準源與流量標準源回傳之訊號做為迴授訊號。系統會自動對流體加熱與控制流量馬達依預先設定的PID參數施行PID控制，以達到量程所需環境溫度與流量目標值。
經實驗結果，本研究建立之流體測試環境具有穩定的流體加熱功能與流量控制功能。藉由PID控制，使測試管路內達到量程所要求的環境溫度值與流量值，其溫度控制準確度於溫度量程內可以達到±2℃的範圍，流量控制則是可以達到±1%的誤差準確度，足供熱質式流量計之自動品質檢測用途。

Flow measurement is very common for modern factory's applications. Thermal mass flow sensor is widely used as a research tool in fluid mechanics, because it’s great ability of dynamic phenomenon measurement, simple construction and common applicability. Thermal mass flow measurement technique is the most reliable method for measuring a turbulent flow. The purpose of this study is to construct a quality measurement system for Thermal Mass Flow Sensor. The system consists of a host PC with self-developed Human Machine Interface, a data acquisition module, two PID controllers, a temperature and flow controlled testing pipe, a standard flow meter , a standard Thermometer, a fluid heater, a flow control motor, a water tank, a transducer module, communication and compensation systems.
To process a series of temperature and flow span measurement, a stable testing pipe system with controlled temperature and mass flow is built. A thermal mass flow sensor is installed in a testing pipe for automatic quality measurement or calibration. The liquid temperature and mass flow in testing pipe are controlled by two PID controllers. A standard flow meter and a standard Thermometer are worked as the feedback for flow and temperature control respectively. Then the controllers automatically control the flow control motor and fluid heater to achieve the required temperature and flow environment according to the stored PID parameters.
From the experimental results, a stable system with automated temperature and flow control capability is achieved. With the PID control, the accuracy of temperature control can reach ±2℃, and flow control steady state error can be maintained within 1% . The established system is enabling a thermal mass flow sensor to be verified at different temperatures and flow environment.

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