User manual EUTECH INSTRUMENTS DO 6 REV 2

[. . . ] Instruction Manual DO 6 Economy Hand-held Dissolved Oxygen Meter 68X243622 Rev 2 Apr 08 Technology Made Easy . . . Part of Thermo Fisher Scientific Preface This manual serves to explain the use of the DO 6 Dissolved Oxygen Handheld. This manual functions in two ways: first as a step by step guide to help you operate the meter; second, as a handy reference guide. This manual is written to cover as many anticipated applications of the DO6 palm-top meter as possible. If there are doubts in the use of the Dissolved Oxygen Handheld, please do not hesitate to contact the nearest Eutech Instruments / Oakton Instruments authorized Distributor. [. . . ] 1) 2) Repeat steps 1 to 5 as in the steps of Pressure Setting Adjustment. Press the HOLD/ENTER key twice till the meter displays the Salinity setting mode "b. SAL". Use the and keys to enter the salinity of your solution in parts per thousand (ppt). A confirmation indicator "CO" will be displayed for 1. 5 seconds before returning to the main group menu "DPr. 7". Press CAL key to return to the measurement mode. HOLD ENTER 3) 4) 5) HOLD ENTER 6) "CO" will display for 1. 5 seconds Display will return back to "DPr. 7" subgroup menu Figure 16: Salinity Setting Adjustment Sequence 29 Instruction Manual DO 6 6 HOLD FUNCTION This feature lets you freeze the display for a delayed observation. 1) To hold a measurement, press the HOLD/ENTER key while in measurement mode. The %, mg/L, ppm or T annunciator in the display will start blinking to indicate that the measurement is being held. The annunciator will stop blinking to indicate that the held value has been released. Continue to take measurements. 2) 3) A % Annunciator Blinks when meter is in "HOLD" mode Figure 17: Unit in HOLD mode Note: This meter has a selectable auto off feature which when activated will shut the meter off automatically after 20 minutes of non use. If the meter is shut off either automatically or manually, the HOLD value will be lost 30 Instruction Manual DO 6 7 ADVANCED SETUP FUNCTIONS 7. 1 Advanced Setup Overview The advanced setup mode lets you customize your meter's preferences and defaults. There are two Set Up menus: - one which is derived from the % Saturation or Temperature mode and the other is derived from the mg/L (ppm) Concentration mode. 7. 1. 1 1) 2) 3) 4) 7. 1. 2 5) 6) To enter the % Saturation or Temperature Set Up menu: Make sure that the meter is switched-off while in the % Saturation or Temperature measurement mode. "SEt. P" indicator will appear momentarily and "COF. 1" will appear next. To enter the mg/L (ppm) Concentration Set Up menu: Switch off the meter in the mg/L (ppm) Concentration measurement mode. Repeat steps 2 to 3 as above and you will be in the mg/L (ppm) Concentration Set Up menu. The following table combines the explanation for the features available in both Set Up menus. Figures 19 and 20 give an overall view of the Set Up sequence for the % Saturation or Temperature Set Up menu and the mg/L (ppm) Concentration Set Up menu. 31 Instruction Manual SEt. P ­ Enter Set Up Menu DO 6 COF. 1 ­ Enter Configuration Menu A. ATC ­ Selection for automatic temperature compensation. b. DO ­ Selection of mg/L or ppm of the concentration mode measurement. (Only available in Concentration Set Up menu) CAL. 2 ­ Viewing the latest Calibration data `View only' parameter for the latest calibration data of the DO % Saturation calibration and the DO mg/L (ppm) Concentration calibration. Calibration data will be viewed according to its respective Set Up menu. ELE. 3 ­ Viewing the Electrode properties FACT ­ Viewing the Slope Factor OFS ­ Viewing the % Saturation offset adjustment. (Only available in % Saturation Set Up menu) HI. mV ­ Viewing the mV value for 100% Saturation LO. mV ­ Viewing the mV value for 0% Saturation AtO. 4 ­ Selection of automatic power off (20 minutes from the last key press) rSt. 5 ­ Enter Reset Menu A. CAL ­ Selection of Calibration Reset (Clear only Calibration and its Data back to factory default condition) b. USR ­ Selection of User Reset (Clear all user setting back to factory default condition) 32 Instruction Manual DO 6 OFS. 6 - % Saturation Offset Adjustment (Only available in % Saturation Set Up menu) DPr. 7 ­ Enter Barometric Pressure Selection Menu A. HG ­ Selection of Barometric Pressure Setting Adjustment in mmHg A. PA - Selection of Barometric Pressure Setting Adjustment in Kilo Pascal b. SAL ­ Enter the Salinity Setting Adjustment Menu (Only available in mg/L (ppm) Concentration Set Up menu) 33 Instruction Manual Switch off from % Saturation or Temperature measurement mode. Press and hold MODE key and then switch on. DO 6 MODE ON OFF SEt. P will display for 1 second Figure 18: Overview of DO 6 % Saturation or Temperature Setup Menu 34 Instruction Manual MODE ON OFF DO 6 Switch off from Concentration measurement mode. [. . . ] If water is air saturated, then the partial pressure of oxygen in the water will be the same as it is in air. Therefore, all you need to know is the temperature of the air in which the probe is placed. By consulting solubility tables for oxygen at the particular barometric pressure and salinity of the water being measured, the corresponding concentration (mg/L or ppm) can be found for air saturated water at the air calibration temperature, and the meter can be set accordingly. Because most meters are temperature compensated, they will still give correct readings in mg/L even though the actual water temperature may be different to the air calibration temperature. [. . . ]