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Automatic NH3-N Analyzer Research and Design

Author: YuLiLi
Tutor: HuoLiangSheng
School: Beijing Technology and Business University
Course: Mechanical Manufacturing and Automation
Keywords: Ammonia detection Automatic dilution Autosampler RS-485 bus Modbus protocol Syringe pump
CLC: TP216
Type: Master's thesis
Year: 2009
Downloads: 101
Quote: 0
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Abstract


The ammonia is one of the important indicators of water quality monitoring and evaluation system. The ammonia detector in real time, accurate and rapid detection and analysis of the ammonia content of the water column plays an important role on the control of water pollution, to avoid emergencies caused by ammonia. Home and abroad on the basis of in-depth study of the ammonia detection method, single-chip embedded applications and bus technology, the development of state-of-the-art technology, developed a test line high degree of automation, high ammonia detection system. The article described as the master MCU MCS12XDP512 automatic ammonia detector system hardware, software and bus design ideas and methods. And automatic sample dilution and autosampler these two important module specific design and implementation. Conduct research and analysis on the basis of the existing hydraulic system, using a peristaltic pump and solenoid valve control of the fluid path. Ammonia detection method of the selection Nessler's reagent spectrophotometry, the determination of the concentration of the sample according to the Lambert - Beer law of absorption. And the need for the ammonia detector designed with thermostatically controlled distillation pretreatment unit to solve the Nessler's reagent spectrophotometry can only detect the bottleneck of high-purity water quality. Ammonia sensitive electrode also spent on this basis, to achieve auto-dilution of the high concentration of the system function, automatic ammonia analyzer detection line reaches 100 mg / L. The measurement results can be stored by analyzer through the LCD display. Users via keyboard instrument operation control. This paper presents the system development process is the most critical hardware circuit and software flow chart, as well as part of the program. In-depth study on the basis of design of the system on-site bus and bus protocol based on the RS-485 bus master control system, and selected the the Modbus bus protocol for the system design and implement automatic ammonia analyzer Modbus fieldbus protocol control system bus interface and protocol implementation were described in detail. In addition, the system pay attention to the various signals in the design process, power fluctuations, component aging, work environment change the interference of various factors on the measurement results and fitting curve method for the system part of the control test data were analyzed and verified. Confirmed that the system precision, high stability, and can complete the whole process is automatic determination.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Automatic testing equipment,instruments
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