现已研制出一种电子控制器,用于东南部俄克拉荷马州的长年山区河流中,以便在于不同水位高度抽取水样。控制器与自动抽水式采样器,以及一个磁继电转换器连合使用,随着水位变化,磁性浮标使得继电器闭合,转换器便产生一个电脉冲信号。控制器监测继电器的关闭状态,并通知采样器在预定水位取样。在取样后,该水位的另一开关关闭信号将不被理采,直到其上面或下面最临近的一个继电器闭合,这样由湍流水位波动而引起的非故意的开闭将不被传送给采样器,从而可避免在某一给定水位中两次或多次采样。野外实验表明,该装置稳定可靠,在一定的使用范围内,可用来改进水质取样系统。该控制器使用干电池供电,功耗低,线路简单,安装方便。仪器和安装费用不超过100美元。 An electronic controller has been developed for use in perennial mountain rivers in Oklahoma in the southeast to extract water samples at different water levels. The controller, in conjunction with an automatic water sampler and a magnetic relay, closes the relay as the water level changes, and the converter generates an electrical pulse. The controller monitors the relay’s shutdown status and notifies the sampler to sample at a predetermined water level. After sampling, another switch-off signal at this level will not be picked until one of the relays closest above or below is closed so that unintentional opening and closing caused by turbulent water level fluctuations will not be transmitted to the sampler , Thus avoiding sampling twice or more in a given water level. Field experiments show that the device is stable and reliable, and can be used to improve the water quality sampling system within a certain range of use. The controller uses a battery-powered, low power consumption, simple wiring, easy installation. Instruments and installation costs no more than $ 100.