The Development Of Temperature Control System Based On PID Self-tunning Technology In Electrospray Ionization Source

To solve our mass spectrometry instruments on almost all imports, in 2004. "15" national research project "Research and development of scientific instruments," the key issue "of research mass spectrometry instruments and system development, "the China National Institute of Metrology chemical measurement and analysis of scientific research carried out. Electrospray mass spectrometry has become the main target of which developed one of this paper, metal capillary electrospray ionization source of heating, developed a temperature control system.The temperature control system hardware used as a Pt100 temperature sensor, the use of 12-bit ADC. Samsung S3C4510B SCM application, I sent a signal to the solid state relay through IO. Heating control rods off the 48V power supply, control the temperature.Software used mainly PID algorithm. Experimental comparison of different algorithms and parameter tuning PID control technology, a temperature control system parameters. A self-tuning can be the final approach, which consists of two self-tuning. First, temperature control system parameters can be obtained through its own testing, PID control in the process. With three parameters of the temperature change will be self-regulating.S3C4510B mainly in the development of software-based operating system for embedded MCUμCLinux, including A/D conversion, PID algorithm, filter, pulse, temperature data kept several Functions. Temperature control functions, as well as a temperature control system using TCP protocol and the communications network is remote control. The results include operations of the algorithm, temperature, temperature difference, the total deviation of the data and several pulse widths, Contents located in the executable programs, text files generated by the storage temperature data, in order to compose a curve analysis.The results of the tests and performance are as follow:(1)Temperature range: room temperature (around 20℃) to 30℃;(2)Temperature accuracy:±1℃;(3)Temperature less than 2℃over-regulation;(4)Rising time must not be more than 25 minutes; (5)It can be set at any time based on user needs temperature.The project has fully met the required technical specifications. Temperature control system used in this Electrospray Ionization Mass Spectrometry, the samples tested by reserpine. Under different temperature conditions has been detected signal sensitivity results showed that the samples for reserpine. When the temperature is set at 150℃, and better results were exceptionally high or low results were poor. This also demonstrates the need for the development of the temperature control system, users can set different temperature under different conditions. Heating may be blind to prevent the danger and trouble. In addition, the system can be used to control the temperature chromatograph analysis of the need for such equipment.