User manual EUTECH INSTRUMENTS WATERPROOF CYBERSCAN DO 300 DISSOLVED OXYGEN METER

[. . . ] Instruction Manual DO 300 Waterproof Hand-held Dissolved Oxygen / Temperature Meter 68X248909 Technology Made Easy . . . Rev 3 02/04 Preface This manual serves to explain the use of the Waterproof DO 300 hand-held meter. It functions in two ways, firstly as a step by step guide to help you to operate the meter. Secondly, it serves as a handy reference guide. It is written to cover as many anticipated applications of the Waterproof DO 300 meter as possible. [. . . ] The upper display shows the salinity value and the lower shows SAL. Press MI/ or MR/ keys to enter the correct or MR/ keys to scroll through main groups until you view parameter "dPr" in the upper salinity adjustment factor. The salinity adjustment factor range is 0. 0 to 50. 0 ppt. Press the ENTER key to confirm selection and to move back to main group "dPr". If you want to return to measurement mode, press CAL/MEAS. (The values shown above are for illustration purpose only) Figure 19: Input Salinity values for automatic correction 23 Instruction Manual DO 300 8. 4 OFS: Offset for % Saturation Measurement NOTE: This feature appears from % saturation SETUP mode only. From measurement mode: 1. Press the MODE key to select % saturation mode. Press the SETUP key to enter SETUP mode. Press MI/ or MR/ keys to scroll through main groups until you view parameter "OFS" in the upper display. The upper display shows the current measurement in % saturation and the lower shows "OFS". Press MI/ or MR/ keys to offset the % saturation measurement. Press the ENTER key to confirm selection and to move back to main group "OFS". If you want to return to measurement mode, press CAL/MEAS. (The values shown above are for illustration purpose. Your meter may display different values depending on the settings & your environmental conditions) Figure 20: Offset for % saturation 24 Instruction Manual DO 300 8. 5 CAL: Previous Calibration Information This feature shows you the previous calibration data, along with date and time of calibration. This is a "view only" parameter. In % saturation SETUP mode: Calibration information is shown in % saturation units. In mg/L (ppm) SETUP mode: Calibration information is shown in mg/L (ppm) units. Press the MODE key to select the calibration data you want to view: % or mg/L (ppm). Press the SETUP key to enter SETUP mode. The upper display shows the calibration data. The display shows the date and time of the last calibration. Press the ENTER key to move back to main group "CAL". If you want to return to measurement mode, press CAL/MEAS. Figure 21: View calibration data or MR/ keys to scroll through main groups until you view parameter "CAL" in the upper NOTE: If you did not calibrate this meter in a particular mode, the screen will show " ---". [. . . ] Oxygen is also produced by aquatic plants and algae as a by-product of photosynthesis. The amount of DO that can be held by water depends on 3 factors: water temperature, salinity, and atmospheric pressure. Amount of DO increases with decreasing temperature (colder water holds more oxygen). Amount of DO increases with decreasing salinity (freshwater holds more oxygen than saltwater does). [. . . ]