一种多功能水质测定仪

A MULTI-FUNCTION WATER QUALITY MONITOR

介绍一种SWQ-1型多功能水质测定仪,以数字显示温度,盐度,溶解氧,pH和氧化还原电势。仪器用干电池供电,其结构是以一个带有多路模数转换器和液晶显示器的低功耗单片微计算机为基础而构成。通过微计算机按照存贮器中的物理化学公式和定标常数进行数据处理,并把结果送给显示器。温度和pH传感器用的是定型的商品—热敏电阻和玻璃电极。盐度和溶解氧分别采用由作者自行设计的铂电极电导池和薄膜原电池型传感器进行现场测量。溶解氧的测量采用了自动定标程序,减少了电位漂移对测量的影响,提高了测量的可靠性,并且便于操作。这种水质测定仪是一种尺寸小,重量轻,效率高的便携式仪器。

The water quality monitor is of great importance to environmental protection and aquacul-ture.This article presents a multifunction water quality monitor,type SWQ-1,which provides measurements of temperature,salinity,dissolved oxygen,pH and oxidation-reduction potential in digital display.The instrument is dry battery operated and based on a low-power single chip microcomputer with a muld-channel analog/digital convener and a liquid crystal display According to physical-chemistry formulas aad calibration constants in the memory,the microcomputer does the data processing and the display of the results.The temperature sensor and pH sensor are commercial products-thermistor and glass electrod.A special designed electrode-type conductivity cell is used for the salinity measurement.A special designed sensor cell is used for the dissolved oxygen measurement.Particularly,the dissolved oxygen measurement shows high reliability'and easy operation because an automatic calibrarion sequence has been applied for the measurement of dissolved oxygen.The water quality'monitor is an efficient and portable instrument.