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. [. . . ] or MR/ key to turn reset feature ON Figure 23: Re-set All Values 30 Instruction Manual DO 100 8. 2 SET Function in mg/L or ppm Measurement Mode This part of the SETUP function allows display of values and the changing of parameters unique to the mg/L measurement mode. Figure 25 on the following page shows the flow diagram of the SETUP menu. To move from one menu to the next without changing any parameter, simply press HOLD key as shown in Figure 25. At any level, press CAL/MEAS to exit setup function and go back to the measurement mode. Press ENTER or MI/ or MR/ key to enter the menu to change parameter or simply to view 8. 2. 1 This 1. 3. P 1. 0: Clr clears all memory data input keyed during measurement. Press MI/ or MR/ key to switch to "ON". Press ENTER key to confirm deleting all memory data. The meter will pause briefly and move on to the next menu. See Figure 24. 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. NOTE: The data cleared relates to the input taken while the meter was in mg/L or ppm measurement mode. To clear data input in % Figure 24: Clear Menu Saturation measurement mode, switch the measurement mode to % Saturation and refer to Section 8. 1. 1 on page 23. 31 Instruction Manual DO 100 Figure 25: Flow Diagram in SETUP Menu (mg/L or ppm) 32 Instruction Manual DO 100 8. 2. 2 P 2. 1: SAL This is a useful feature that allows you to key in the salinity value of the sample solution to be measured. The meter will clear all values and go back to measurement mode. Figure 32: Reset All Values 37 Instruction Manual DO 100 9 9. 1 DISSOLVED OXYG EN PROBE Dissolved Oxygen Principle The probe is a galvanic measuring element which produces an output proportional to the oxygen present in the medium in which it is placed. The galvanic probe design lets you take measurements immediately ­ without the typical 15 minute wait of other dissolved oxygen probes. The probe consists of two parts: · · An upper part consisting of an anode, a cathode, and cable. A lower part consisting of a membrane cap, membrane, and electrolyte solution. See Figure 33. Oxygen diffuses through the membrane onto the cathode, where it is consumed. This process produces an electrical current which flows through the cable to the meter. The electric current produced is proportional to the oxygen that passes through the membrane and the layer of electrolyte. This makes it possible to measure the partial pressure of oxygen in the sample at a given temperature. Since the DO in the sample is consumed by the cathode it is essential that a new sample must flow past the membrane of the probe to prevent the occurrence of false readings. This enables it to function correctly with liquid movement as low as 2. 5 cm/sec. The permeability of the membrane to oxygen varies greatly with temperature. [. . . ] Fish growth and activity usually require 5 to 6 ppm of DO, an important consideration for Aqua-culture industry. 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. [. . . ]