User manual EUTECH INSTRUMENTS CYBERSCAN PH500 PHORP BENCH METER

[. . . ] Eutech Instruments/ Oakton Instruments cannot accept any responsibility for damage or malfunction to the meter caused by improper use of the instrument. The information presented in this manual is subjected to change without notice as improvements are made, and does not represent a commitment on the part of Eutech Instruments Pte Ltd/ Oakton Instruments. Copyright © 1998 All rights reserved. Eutech Instruments Pte Ltd. Oakton Instruments Rev 4 01/04 TABLE OF CONTENTS 1 2 2. 1 2. 2 INTRODUCTION DISPLAY AND KEYPAD FUNCTIONS Display Keypad 2 3 1 2 3 3. 1 3. 2 3. 3 PREPARATION Inserting the Batteries Connecting the Probe Connecting the AC Adapter 5 6 7 5 4 4. 1 4. 2 4. 3 CALIBRATION Temperature Calibration DO Calibration in Air (with ATC) ­% Saturation Mode DO Calibration in mg/L Mode 9 11 13 8 5 5. 1 MEASUREMENT Taking Measurement 14 14 15 16 16 18 6 7 7. 1 7. 2 HOLD FUNCTION MEMORY FUNCTION Data Input Memory Recall 8 8. 1 8. 2 SET FUNCTION SET Function in % Saturation Measurement Mode SET Function in mg/L or ppm Measurement Mode 21 31 20 9 9. 1 9. 2 9. 3 9. 4 9. 5 DISSOLVED OXYGEN PROBE Dissolved Oxygen Principle Probe Care Membrane Housing Replacement Electrolyte Solution DO Probe Troubleshooting Table 38 39 40 43 44 38 10 11 12 12. 1 TROUBLESHOOTING ERROR MESSAGES ADDITIONAL INFORMATION Dissolved Oxygen 48 46 47 48 51 52 54 54 13 14 15 16 SPECIFICATIONS ACCESSORIES WARRANTY RETURN OF ITEMS Instruction Manual DO 100 1 INTR ODUCTION The DO 100 portable meter is a It is Thank you for selecting the DO 100 portable meter. microprocessor-based instrument that is designed to be practical and user-friendly. [. . . ] Once you come to the [EL 1, P 3. 0] menu shown in Figure 20, press ENTER. Press ENTER or HOLD key to go into the next menu. 8. 1. 5 P 3. 1: EL 2 This menu displays the offset value that has been keyed in the OFS (P 2. 0) SETUP menu. This is useful to compare the status of the probe. Once you come to the [EL 2, P 3. 1] menu shown in Figure 20, press ENTER. Press ENTER or HOLD key to go into the next menu. 8. 1. 6 1. 3. P 3. 2: EL 3 This menu displays the actual offset value in mV for the last zero point calibration. Once you come to the [EL 3, P 3. 2] menu shown in Figure 20, press ENTER. The LCD will show the offset value in mV. Press ENTER or MODE key to go into the next menu. 27 Instruction Manual DO 100 Figure 20: Checking Electrode Status in EL Menu 28 Instruction Manual DO 100 8. 1. 7 P 4. 1: rdY You can activate or deactivate the stabilising feature in the meter in this menu. Once you come to the setup menu shown in Figure 21, press ENTER. Press MI/ or MR/ key to toggle between ON or OFF. Press ENTER or MODE key to go into the next menu. Figure 21: READY 8. 1. 8 P 4. 2: A. oFF The meter has a Power Auto-off feature that switches off the unit 20 minutes after the last key press. NOTE: Press HOLD key to skip this operation and move on to the next menu, or press CAL/MEAS key to exit setup menu to go back to measurement mode. 8. 2. 3 P 2. 2: bAr Figure 26: Adjusting for Salinity Value This menu allows: · · Selecting the prefered unit of pressure--either mm Hg or kPA. Keying of actual atmospheric pressure value based on the altitude of the location. This is an important feature as DO is dependent on pressure (refer Section 12. 1 on page 48). Without you having to refer to tables, the DO 100 will use this input to compensate for the measured value automatically. Once you come to the [bAr P 2. 2] menu shown in Figure 27, press ENTER. Press MI/ or MR/ key to select "Hg" or "PA" as unit of pressure measurement. Press ENTER key to go into the next level. NOTE: The range for atmospheric correction ranges from 555 to 808 mm Hg or 74 to 108 kPA. or MR/ key to adjust value accordingly to the location's actual atmospheric 5. The meter will accept the value and move on to the next menu. Figure 27 on the following page shows the flow diagram on this menu. 33 Instruction Manual DO 100 NOTE: Press HOLD key to skip any part of the operation and move on to the next menu, or press CAL/MEAS key to exit setup menu to go back to measurement mode. Figure 27: Select Units for Pressure and Adjust Its Value 34 Instruction Manual DO 100 REMARKS: The following 2 menus display the condition of the DO probe from the last calibration performed. 3. P 3. 0: EL 1 This menu displays the slope of probe as a ratio of ideal to its measured value. Once you come to the [EL 1, P 3. 0] menu shown in Figure 28, press ENTER. Press ENTER or HOLD key to go into the next menu. 8. 2. 5 1. 3. P 3. 2: EL 3 This menu displays the actual offset value in mV for its last zero point calibration. [. . . ] Natural organic material such as leaves accumulate in the stream and create an oxygen demand as it is decomposed. Organic material from human activities also create an oxygen demand in the system. Micro-organisms consume oxygen as they decompose sewage, urban and agricultural run-off, and discharge from food-processing plants, meat-packing plants and diaries. There is an optimum DO level for this process and if DO level falls too low, the micro-organisms die and the decomposition ceases. [. . . ]