摘要: The Yellow Springs Instrument Co.,Model 57Dissolved Oxygen Meter measures dissolved oxygen and temperature in situ in fresh and salt water. Dissolved oxygen is sensed with a gold-silver polarographic membrane type probe that is de... 展开 The Yellow Springs Instrument Co.,Model 57Dissolved Oxygen Meter measures dissolved oxygen and temperature in situ in fresh and salt water. Dissolved oxygen is sensed with a gold-silver polarographic membrane type probe that is designed to be automatically temperature compensated. Compensation for salinity may be achieved by manual adjustment of a dial on the face of the readout unit. Temperature is sensed by a thermistor. Data are provided in the form of a visual display on an analog panel meter and through analog recorder outputs. The Model 57is powered by C-size,carbon-zinc batteries. An optional stirrer powered by a separate set of five rechargeable nickel-cadmium batteries is also available. 收起