摘要: The Martek Instruments,Inc. Model DDO/Mark V Digital Dissolved Oxygen Analyzer is designed for simultaneous in-situ measurement of dissolved oxygen and temperature. Dissolved oxygen is sensed by a gold-silver polarographic membran... 展开 The Martek Instruments,Inc. Model DDO/Mark V Digital Dissolved Oxygen Analyzer is designed for simultaneous in-situ measurement of dissolved oxygen and temperature. Dissolved oxygen is sensed by a gold-silver polarographic membrane type probe that is designed to be automatically temperature compensated. Temperature is sensed by a thermolinear array which uses a PN-junction semiconductor device. The sensor outputs are developed as analog signals which are then digitized by automatic-zeroing, commandable dual-slope circuitry which converts at rates of 5to 7times per second with appropriate integration for each conversion cycle. Readout is on a 4-digit panel meter switchable for each parameter. This display can be read continuously or made to flash at a fixed rate to conserve power or disabled entirely while operating in a recording mode. 收起