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1 GENERAL DESCRIPTION The YSI Model 55 Handheld Dissolved Oxygen System is a rugged, micro-processor ' based, digital meter with an attached YSI dissolved oxygen probe The YSI Model 55 is designed for field use and is available with cable lengths of either ' 12 or 25 feet The body of the probe has been manufactured with stainless steel to add rugged durability and sinking weight The large Liquid Crystal Display (LCD) is easy to read, and is equipped with a back-light for use in dark or poorly lighted areas ' The Model 55's micro-processor allows the system to be easily calibrated with the press of a few buttons Additionally, the micro-processor performs a self-diagnostic routine each time the instrument is turned on The self-diagnostic routine provides you with useful information about the function of the instrument circuitry and the quality of the readings you obtain For a list of these diagnostic features, see the chapter entitled Troubleshooting ' The system simultaneously displays temperature in °C and dissolved oxygen in either mg/l (milligrams per liter) or % air saturation The system requires only a single calibration, regardless of which dissolved oxygen display you use You can switch back and forth from % air saturation to mg/l with a single push of the MODE key ' A calibration chamber is built into the instrument A small sponge in the chamber can be moistened to provide a water saturated air environment which is ideal for air calibration procedures This chamber is also designed for transporting and storing the probe When the probe is stored in the chamber, the moist environment will prolong effective membrane performance and probe life ' The instrument is powered by six AA-size alkaline batteries A new set of alkaline batteries will provide approximately 100 hours of continuous operation When batteries need to be replaced, the LCD will display a "LO BAT" message ' The YSI Model 55 instrument case is splash resistant You can operate your Model 55 ' in a steady rain without damage to the instrument If it were inadvertently dropped into water there is no need for concern because the Model 55 FLOATS