User manual EUTECH INSTRUMENTS DO 700

[. . . ] Instruction Manual DO 700 Dissolved Oxygen/ºC/ºF Bench Meter Technology Made Easy . . . Part of Thermo Fisher Scientific 68X541703 Rev. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GETTING STARTED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. 1 2. 2 2. 3 Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] determined by titration or another instrument). The CAL indicator and current concentration display briefly, before CAL flashes. The concentration value based on the factory default calibration is shown. or to adjust the reading to match the known Press oxygen concentration value. 4) 5) 8 Press to confirm the calibration. The primary display will blink briefly before returning to measurement mode. NOTE: The minimum calibration value is 2 mg/L. In addition, the calibration is limited to ±40% adjustment of the factory default value to prevent erroneous calibrations. 6) 5. SETUP FUNCTIONS Use the setup feature to customize your instrument operation. There are two setup menus; one menu is derived from the % saturation mode and the other from the mg/L (or ppm) concentration mode. First, select the appropriate measurement mode you wish to adjust by pressing until the desired units are displayed. During for 5 seconds to enter SETUP measurement, press and hold mode of the parameter being measured. Press Press Press or to change programs or change options. to select the program or confirm selection. to go back one level or return to measurement mode. 5. 1 1. 0 CAL (Calibration) Press to view stored calibration points. Note: % saturation mode will list two points, while concentration mode has only one point. 9 5. 2 2. 0 ELE (Electrode Information) Press to view calibration factor (CAL. F) TIP: The factor is an indication of the probe's efficiency. or to select "Yes" (Erase memory) or "No". to confirm. 12 6. TAKING MEASUREMENTS During measurement the dissolved oxygen reading is automatically compensated for pressure and salinity. For best accuracy, ensure the pressure and salinity settings are adjusted accordingly from the setup menu. The factory default value for barometric pressure is 760 mm Hg or 101. 3 bar (sea level). The factory default value for salinity is 0. 0 ppt (no salinity). See Section 5. 6 -- Barometric Pressure Adjustment. Press · · · · to select the desired measurement mode: Percentage Saturation (%) and Temp (º C or ºF) Concentration (mg/L or ppm) and Temp (º C or ºF) Follow these general rules when taking measurements: Keep the membrane free from contact with solid objects. Provide stirring of your solutionthis helps to overcome oxygen consumption of the probe and prevents air bubble entrapment. Do not submerge the cable for extended periods. The pre-assembled cap must be completely submersed to obtain an accurate reading in solutions. [. . . ] Check electrode-add electrolyte &/or replace membrane. to deactivate manual PROBLEM No display "Ur" (Under range) "Or" (Over range) in primary or secondary display Meter not responding to key press Worn keypad. See Section 5. 4 -- Auto Hold to disable Auto Hold feature if enabled. Contact Technical Service. Invalid key; Button is not functional in the current operation mode. Secondary display continually shows 0 and 100, during % calibration The calibration value is too high to be accepted as a 0% standard, and too low to be accepted as a 100% standard (10. 1% to 49. 9%), compared against factory default value. Press alternate key. [. . . ]