EUTECH INSTRUMENTS ECOSCAN DO 6 DO METER Instruction Manual
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EUTECH INSTRUMENTS ECOSCAN DO 6 DO METER Instruction Manual

Economy hand-held dissolved oxygen meter
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Instruction Manual
DO 6
Economy Hand-held Dissolved Oxygen Meter
68X243622
Rev 0 01/04
Technology Made Easy ...

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Summary of Contents for EUTECH INSTRUMENTS ECOSCAN DO 6 DO METER

  • Page 1 Instruction Manual DO 6 Economy Hand-held Dissolved Oxygen Meter 68X243622 Rev 0 01/04 Technology Made Easy ...
  • Page 2 Oxygen palm-top meters, please do not hesitate to contact the nearest Eutech Instruments / Oakton Instruments authorized Distributor. Eutech Instruments/Oakton Instruments will not accept any responsibility for damage or malfunction to the meter caused by improper use of the instrument.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ..............1 DISPLAY & KEYPAD FUNCTIONS........2 ................2 ISPLAY ................3 EYPAD PREPARATION.................4 & R ......4 NSERTING EMOVING UBBER ...........5 NSERTING THE ATTERIES ............6 ATTERY EPLACEMENT ......7 ISSOLVED XYGEN ROBE NFORMATION ........9 ONNECTING THE ROBE TO ETER ..........10 WITCHING THE ETER :- P EASUREMENT...
  • Page 4 ............25 AKING EASUREMENTS 5.3.1 To take measurements: ..........25 AKING RESSURE ALINITY OMPENSATED ................26 EASUREMENTS 5.4.1 Pressure Setting Adjustment........26 5.4.2 Salinity Setting Adjustment.........29 HOLD FUNCTION..............30 ADVANCED SETUP FUNCTIONS........31 ..........31 DVANCED ETUP VERVIEW 7.1.1 To enter the % Saturation or Temperature Set Up menu: ..................31 7.1.2...
  • Page 5 7.8.1 Pressure Setting Adjustment........49 7.8.2 Salinity Setting Adjustment.........51 PROBE CARE AND MAINTENANCE.........52 ...............53 ROBE ......53 EMBRANED EPLACEMENT ....54 O REPLACE THE PROBE PRE MEMBRANED CAP ............55 LECTROLYTE OLUTION TROUBLE-SHOOTING GUIDE ...........56 ERROR MESSAGES............57 FACTORY DEFAULT SETTINGS ........58 SPECIFICATIONS ..............60 ACCESSORIES..............62 ADDITIONAL INFORMATION ........63 14.1 ............63...

  • Page 6: Introduction

    Instruction Manual DO 6 INTRODUCTION Thank you for purchasing the DO 6 Dissolved Oxygen palm-top meter. This economy microprocessor-based palm-top meter has a large custom LCD (Liquid Crystal Display) for clear and easy reading. The DO 6 offers the measurement of dissolved oxygen in the percentage saturation mode and in the concentration mode.

  • Page 7: Display & Keypad Functions

    Instruction Manual DO 6 DISPLAY & KEYPAD FUNCTIONS Display The meter has a large custom LCD that consists of 14-segment 4 digit display and operation annunciators for Percentage Saturation measurement mode (%), Concentration measurement mode (mg/L ppm) Temperature measurement mode in degrees Celsius (T). Other annunciators include “A” (when the ATC function is activated), “CAL”...

  • Page 8: Keypad

    Instruction Manual DO 6 Keypad The DO 6 meter has 6 keys on its splash-proof keypad; ON/OFF, HOLD/ENTER CAL, MODE, ▲ and ▼ keys. Some buttons have several functions depending on its mode of operation. ON/OFF – Powers on and shuts off the meter. The meter will start in the measurement mode it was in when last switched off.

  • Page 9: Preparation

    Instruction Manual DO 6 PREPARATION Inserting & Removing Rubber Boot To remove meter from rubber boot, push out from the bottom edges of meter until it is completely out of boot. Ensure that the cables of Dissolved Oxygen electrode or temperature probe are not connected. To insert meter into rubber boot, slide in from the top of meter before pushing the bottom edges of meter down to set it into position.

  • Page 10: Inserting The Batteries

    Instruction Manual DO 6 Inserting the Batteries The battery compartment is found at the back of instrument as shown in Figure 3. To open the battery compartment first remove protective rubber boot/stand then: Push in the direction of arrow and lift up the cover. Note the polarity of battery before inserting into position.

  • Page 11: Battery Replacement

    Instruction Manual DO 6 Battery Replacement A low battery annunciator in the LCD alerts you when battery power is running low. See Figure 4. Replace with the same type as recommended by the manufacturer. Figure 4: Low Battery Condition Caution: Power off the meter when changing battery.

  • Page 12: Dissolved Oxygen Probe Information

    Instruction Manual DO 6 Dissolved Oxygen Probe Information The DO 6 palm top meter is supplied with a Dissolved Oxygen Probe that works on galvanic principle, that is, it does not require any polarising voltage from your meter. Rather it will generate a millivolt signal proportional to the amount of oxygen in the solution.
  • Page 13 Instruction Manual DO 6 time. Always immerse the probe beyond the pre-membraned cap. The minimum water flow rate is 2 inch/second across membrane. The temperature range for use is within 0 to 50 °C. Always ensure that the probe’s membrane is protected against any scratches or dents.

  • Page 14: Connecting The Probe To Meter

    Instruction Manual DO 6 Connecting the Probe to Meter Insert the BNC connector from the electrode to the BNC connector socket on the meter accordingly and rotate connector clockwise until it locks. See Figure below. To remove, simply rotate the connector in counter-clockwise direction until it unlocks, and slide the connector off the socket.

  • Page 15: Switching The Meter On

    Instruction Manual DO 6 Switching the Meter On When switching the meter on, it will go through a series of display, eventually CAL 13 CAL 24 TAvg showing the revision number of the meter mg/l before going to the measurement mode. The mode of measurement which the meter displays will be similar to the last measurement mode to which the meter is...

  • Page 16: Measurement Mode Selection:- Percentage Saturation (%), Concentration (Mg/L)(Ppm) And Temperature(T)

    Instruction Manual DO 6 Measurement Mode Selection:- Percentage Saturation (%), Concentration (mg/L)(ppm) and Temperature(T) By simply pressing the MODE key, you can select the measurement mode of percentage saturation measurement, concentration measurement temperature measurement. The customized annunciator shall indicate the selection of the measurement mode.

  • Page 17: Calibration

    Instruction Manual DO 6 CALIBRATION Important Information on Meter Calibration Your meter has three measurement modes namely the DO % saturation measurement mode, the DO mg/L (ppm) concentration mode and the Temperature measurement mode. Since the mg/L (ppm) concentration value of dissolved oxygen varies with temperature, barometric pressure and salinity, the meter with its electrode has to be calibrated with consideration to these factors to ensure a proper measurement.

  • Page 18: Preparing The Meter For Calibration

    Instruction Manual DO 6 In the mg/L (ppm) concentration calibration mode, barometric pressure, salinity and temperature of the calibration sample needs to be set in the meter prior to calibration. Since the pressure has already been set in the % saturation calibration which is done earlier and assuming that the calibration is done on the same barometric pressure and if you are using the temperature sensor in automatic temperature compensation mode, you only need to input the known...
  • Page 19 Instruction Manual DO 6 calibration failure for 0% Saturation slope calibration; the meter may have exceeded the limit of 10% of the factory calibrated absolute value. The sensor may have to be re- conditioned. Also, note that the DO 6 meter will not perform 0% or 100% Saturation calibration for absolute value ranging from 10.1% to 49.9%.

  • Page 20: Temperature Calibration

    Instruction Manual DO 6 Temperature Calibration DO mg/L (ppm) Concentration measurement is dependent on the temperature of the sample to be measured. Most users will choose to have the DO6 automatically compensate temperature using temperature sensor that is built into the DO probe.
  • Page 21 Instruction Manual DO 6 Press the ▲ and ▼ keys to adjust the meter reading to the correct temperature value (i.e. the temperature of the temperature bath) Press the HOLD/ENTER key to confirm temperature calibration and return to measurement mode. NOTE: To exit from Temperature Calibration mode without confirming the calibration, press CAL instead of HOLD/ENTER.

  • Page 22: Dissolved Oxygen Calibration In % Saturation

    Instruction Manual DO 6 Dissolved Oxygen Calibration in % Saturation You can calibrate this meter quickly and easily in air. The exact calibration value depends on barometric pressure. The meter is set to a factory default of 760 mm Hg, which results in a calibration value of 100% Saturation in air.
  • Page 23 Instruction Manual DO 6 blink and the display will show a value which is with respect to the factory default calibration. NOTES: When calibration is attempted on a factory calibrated absolute value measurement of 10.1% to 49.9%, the display will show the absolute value measurement for 1.5 seconds before displaying Err.1 and goes to the measurement mode.

  • Page 24: To Calibrate 0% Saturation

    Instruction Manual DO 6 4.4.2 To calibrate 0% Saturation Rinse the probe well with DI water or rinse solution. Press the MODE key to select the % Saturation mode, if necessary. Dip the probe into the zero oxygen solution. Wait for the reading to stabilize.

  • Page 25: Dissolved Oxygen Calibration In Mg /Lor Ppm Concentration Mode

    Instruction Manual DO 6 Dissolved Oxygen Calibration in mg/L or mg/l ppm concentration mode Calibrating the meter to 100% Saturation will also calibrate the concentration mode at the value in mg/L corresponding to 100% Saturation. This should produce acceptable results in most applications. mg/l This meter also lets you make a calibration adjustment in mg/L (ppm) Concentration...
  • Page 26 Instruction Manual DO 6 the factory default calibration with a CAL indicator blinking at the corner of the display. Press the ▲ and ▼ keys to adjust the reading to the known oxygen concentration of the sample. Press the HOLD/ENTER key to confirm the calibration. The meter will display “CO”...

  • Page 27: Measurement

    Instruction Manual DO 6 MEASUREMENT The DO 6 meter is capable of taking measurements with automatic or manual temperature compensation. With Automatic Temperature Compensation (ATC) For Automatic temperature compensation, make sure the phono jack of the probe (see Figure 6 in Section 3.5) is securely inserted. The ATC annunciator “A”...

  • Page 28: Manual Temperature Compensation

    Instruction Manual DO 6 Manual Temperature Compensation manual temperature compensation, simply deactivate the “A.ATC” mode as explained in the set up menu on page 36. The automatic temperature compensation annunciator “A” will not be displayed to represent that the meter is in manual temperature compensation mode.
  • Page 29 Instruction Manual DO 6 value of the reference thermometer used. Press the HOLD/ENTER key to confirm the manual temperature setting made. The “CO” indicator will appear for 1.5 seconds before the display returns to the measurement mode.

  • Page 30: Taking Measurements

    Instruction Manual DO 6 Taking Measurements During measurement, care must be taken to ensure that the probe’s membrane surface does not touch anything. Stir around the solution to prevent any air bubbles from being trapped membrane before taking a reading. Since probe IMPORTANT:...

  • Page 31: Taking Pressure/Salinity Compensated Do Measurements

    Instruction Manual DO 6 Taking Pressure/Salinity Compensated DO Measurements In taking pressure and salinity compensated DO measurements, the pressure and salinity values of your measurements need to be adjusted from the Set Up menu. The pressure setting adjustment feature is available when Set Up menu is derived from the % Saturation mode, mg/L (ppm) Concentration mode or Temperature mode.
  • Page 32 Instruction Manual DO 6 Use the ▲ and ▼ keys to set the pressure value and press the HOLD/ENTER to confirm the setting. A confirmation indicator “CO” will be displayed for 1.5 seconds before the meter shows the next display of Salinity setting “b.SAL”.
  • Page 33 Instruction Manual DO 6 HOLD ENTER HOLD HOLD ENTER ENTER HOLD HOLD ENTER ENTER “CO” will display “CO” will display for 1.5 seconds for 1.5 seconds Display will continue to Display will continue to Salinity setting menu Salinity setting menu “b.SAL”...

  • Page 34: Salinity Setting Adjustment

    Instruction Manual DO 6 5.4.2 Salinity Setting Adjustment NOTE: This mode is available only from the mg/L (ppm) Concentration Set Up menu. Repeat steps 1 to 5 as in the steps of Pressure Setting Adjustment. HOLD ENTER Press the HOLD/ENTER key twice till the meter displays the Salinity setting mode “b.SAL”.

  • Page 35: Hold Function

    Instruction Manual DO 6 HOLD FUNCTION This feature lets you freeze the display for a delayed observation. HOLD can be used in any measurement mode. 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.

  • Page 36: Advanced Setup Functions

    Instruction Manual DO 6 ADVANCED SETUP FUNCTIONS 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.
  • Page 37 Instruction Manual DO 6 SEt.P – Enter Set Up Menu 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 –...
  • Page 38 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 –...
  • Page 39 Instruction Manual DO 6 Switch off from % Saturation MODE or Temperature measurement mode. Press and hold MODE key and then switch on. SEt.P will display for 1 second Figure 19: Overview of DO 6 % Saturation or Temperature Setup Menu...
  • Page 40 Instruction Manual DO 6 Switch off from Concentration MODE measurement mode. Press and hold MODE key and then switch on. SEt.P will display for 1 second Figure 20: Overview of DO6 Concentration Set up Menu...

  • Page 41: Cof.1) Configuration Menu

    Instruction Manual DO 6 (COF.1) Configuration Menu In this menu, the meter lets you configure the selection automatic temperature compensation (A) and the selection of mg/L HOLD mode mg/L (ppm) ENTER Concentration measurement mode. (Second feature is only available in mg/L (ppm) Concentration Set Up menu) 7.2.1 Selection...
  • Page 42 Instruction Manual DO 6 Note: The meter will either return to the main group menu “COF.1” if % Saturation or Temperature Set Up menu is used or will continue to the mg/L or ppm mode configuration if mg/L (ppm) Concentration Set Up menu is used.

  • Page 43: Selection Of Mg/L Or Ppm Mode

    Instruction Manual DO 6 7.2.2 Selection of mg/L or ppm mode From the “COF.1” of the mg/L (ppm) Concentration Set Up menu, mg/l Press the HOLD/ENTER key thrice to enter the mg/L or (ppm) mode selection menu “b.DO”. Use the ▲ and ▼ keys to select the desired mode of measurement.

  • Page 44: Cal.2) Calibration Data

    Instruction Manual DO 6 (CAL.2) Calibration Data You can view the latest calibration data for the % Saturation and the mg/L (ppm) Concentration calibrations. The calibration data from each mode can be viewed in the Set Up menu respectively. HOLD ENTER 7.3.1 Viewing...

  • Page 45: Ele.3) Electrode Properties

    Instruction Manual DO 6 (ELE.3) Electrode Properties This menu features data of the electrode properties for diagnostic purposes. The “view only” parameters such as the electrode Slope Factor, % Saturation Offset setting, 100% Saturation mV value and 0% Saturation mV value are very useful in determining the life efficiency of the electrode.

  • Page 46: Viewing The 100% Saturation Mv Value

    Instruction Manual DO 6 7.4.3 Viewing the 100% Saturation mV value This parameter shows the sensor’s mV output corresponding to 100% Saturation. From Step 5 above, Press the HOLD/ENTER key. The display will show “HI.mV” momentarily before displaying the sensor’s mV output value with respect to 100% Saturation.
  • Page 47 Instruction Manual DO 6 HOLD ENT ER Viewing of the offset percentage adjustment will be available only if set up menu is selected from the DO % Saturation or the Temperature Mode. Otherwise, this menu “FACT” displays for will be skipped. 1.5 seconds “OFS”...

  • Page 48: Ato.4) Automatic Off

    Instruction Manual DO 6 (AtO.4) Automatic Off This feature is useful for batteries energy conservation. The meter automatically shuts off 20 minutes from the last key press. From any Set Up Menu, Scroll the Set Up main group menu HOLD by using the ▲...

  • Page 49: Rst.5) Reset To Factory Default

    Instruction Manual DO 6 (rSt.5) Reset to Factory Default This mode lets you reset all parameters to factory default settings. There are two levels of reset: Calibration Reset: - Reset only the calibration values. This clears all previous calibrated values and reset HOLD to factory default.
  • Page 50 Instruction Manual DO 6 b. NO – deactivates Calibration Reset Press HOLD/ENTER key to confirm the selection made. If selection is ‘YES’, meter would immediately return to measurement mode. Otherwise it will return to the main group menu. Press CAL to return to the measurement mode.

  • Page 51: User Reset

    Instruction Manual DO 6 7.6.2 User Reset This program clears all data including calibration and other customized setup functions and reset it to factory default. You can skip Calibration Reset and proceed straight to User Reset User Reset From “rSt.5” menu, HOLD ENTER Press HOLD/ENTER key three times...

  • Page 52: Ofs.6) % Saturation Offset Adjustment

    Instruction Manual DO 6 (OFS.6) % Saturation Offset Adjustment This is a useful feature that allows you to offset meter’s value when cross referenced with another DO HOLD ENTER meter. That way, standardized without you having to perform manual calculation. Your DO 6 meter allows % Saturation Offset adjustment within +/- 10.0% offset and its adjusted offset value can be...
  • Page 53 Instruction Manual DO 6 momentarily show the measured reading based on the last calibration before displaying the last offset adjusted value. Use the ▲ and ▼ keys to enter the new value. Press the HOLD/ENTER key to confirm the offset adjustment. “CO” will be displayed for 1.5 seconds before the display returns to the subgroup menu.

  • Page 54: Dpr.7) Dissolved Oxygen Parameters

    Instruction Manual DO 6 (DPr.7) Dissolved Oxygen Parameters This Set Up menu allows you to set the barometric pressure and the salinity value of the sample to be measured. You are given the option to use mmHg or kilo Pascal barometric pressure units. The Salinity value to be entered will be based on ppt and is available in mg/L (ppm) Concentration Set Up menu.
  • Page 55 Instruction Manual DO 6 HOLD ENTER HOLD HOLD ENTER ENTER HOLD HOLD ENTER ENTER “CO” will display “CO” will display for 1.5 seconds for 1.5 seconds Display will continue to Display will continue to Salinity setting menu Salinity setting menu “b.SAL”...

  • Page 56: Salinity Setting Adjustment

    Instruction Manual DO 6 7.8.2 Salinity Setting Adjustment Note: This mode is available only from the mg/L (ppm) Concentration Set Up menu. Repeat steps 1 to 5 as in the steps of Pressure Setting Adjustment. Press the HOLD/ENTER key twice till HOLD ENTER the meter displays the Salinity setting...

  • Page 57: Probe Care And Maintenance

    Instruction Manual DO 6 PROBE CARE AND MAINTENANCE The DO6 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.

  • Page 58: Probe Care

    Instruction Manual DO 6 Probe Care Proper care and maintenance will help you receive the maximum probe life and ensure more accurate readings. Since any deposits on the membrane surface act as a barrier to oxygen diffusing through the membrane, the membrane must be cleaned at regular intervals to assure maximum reliability.

  • Page 59: To Replace The Probe Pre-Membraned Cap

    Instruction Manual DO 6 To replace the probe pre-membraned cap Unscrew counter clockwise the pre-membraned cap from the probe sensing tip and discard. Wash the probe under running water. Take out the bottle of refill solution provided and assemble the needle tip on the tip of the plastic bottle.

  • Page 60: Electrolyte Solution

    Instruction Manual DO 6 Electrolyte Solution The electrolyte solution in your probe’s cap will deplete on usage and will need to be replaced periodically. Your DO probe comes with replacement electrolyte solution. The replacement electrolyte comes premixed and ready to use. To order more electrolyte solution, see “Accessories”...

  • Page 61: Trouble-Shooting Guide

    Instruction Manual DO 6 TROUBLE-SHOOTING GUIDE Problem Cause Solution No display Batteries not in place Remove rubber boot/stand. Check when turned that batteries are in place and Batteries not in correct making good contact. polarity (+ and – position). Re-insert batteries with correct polarity.

  • Page 62: Error Messages

    Instruction Manual DO 6 10 ERROR MESSAGES LCD Display Indicates Cause Solution Low battery Need new batteries or Clean battery contacts. level. battery connection is Replace batteries with bad. fresh ones, noting polarity. Battery indicator “Err 1” in % % Saturation Calibration is Check the value of the Saturation Mode...

  • Page 63: Factory Default Settings

    Instruction Manual DO 6 11 FACTORY DEFAULT SETTINGS Setting FUNCTION PARAMETER PARAMETER DEFAULT Menu OPTING KEYS OPTIONS SETTING COF.1 Unit Configuration Parameter Title Parameter Only Title Only A.ATC Selection of Automatic or ▲ and ▼ YES; NO Manual Temperature Compensation b.DO Selection of mg/L or ppm of ▲...
  • Page 64 Instruction Manual DO 6 Setting FUNCTION PARAMETER PARAMETER DEFAULT Menu OPTING KEYS OPTIONS SETTING DPr.7 Parameter Title Parameter Barometric Pressure Only Title Only Selection Menu ▲ and ▼ A.HG Selection Barometric 500 to 1499 760 mm Pressure Setting mmHg Adjustment in mmHg ▲...

  • Page 65: Specifications

    Instruction Manual DO 6 12 SPECIFICATIONS % Saturation Mode Range 0.00 – 200.0 % Resolution 0.1 % Relative accuracy ± 1.5% of Full Scale mg/L (ppm) Concentration Mode Range 0.00 – 20.00 mg/L or ppm Resolution 0.01 mg/L; 0.01 ppm Relative accuracy ±...
  • Page 66 Instruction Manual DO 6 % Saturation Calibration Limits Factory calibrated absolute value of 10.0% and below for 0% point & 50% to 200% for 100% point. Concentration Calibration Window +/- 40% from the factory default measurement value. Minimum reading allowed is 2.00 mg/L (ppm). Temperature Calibration Window +/- 5°C from factory default measurement Offset Adjustments (% Saturation)

  • Page 67: Accessories

    Instruction Manual DO 6 13 ACCESSORIES Eutech Instruments Oakton Instruments DO 6 meter and probe kit in ECDO601K 35642-60 hard carrying case “Ecoscan DO6” “Acorn DO6” DO 6 meter and probe ECDO601 35642-10 “Ecoscan DO6” “Acorn DO6” Replacement galvanic DO...

  • Page 68: Additional Information

    Instruction Manual DO 6 14 ADDITIONAL INFORMATION 14.1 Dissolved Oxygen 14.1.1 General Information Dissolved Oxygen (DO) refers to the volume of oxygen that is contained in water. There are two main sources of DO in water: from atmosphere and photosynthesis. Waves and tumbling water mix air into the water where oxygen readily dissolves until saturation occurs.
  • Page 69 Instruction Manual DO 6 The chart in Figure 32 shows the solubility of DO in mg/L in water at various temperatures. Solubility of oxygen in water contact with water saturated air at standard atmospheric pressure Temperature °C Figure 32: DO Solubility in Water vs Temperature °C...

  • Page 70: Measurement Units

    Instruction Manual DO 6 14.1.2 Measurement Units One measure of DO in water is parts per million (ppm) which is the number of oxygen molecules (O ) per million total molecules in a sample. Calculating the % Saturation is another way to analyze DO levels. % Saturation is the measured DO level divided by the greatest amount of oxygen that the water could hold under various temperature and atmospheric pressure conditions...

  • Page 71: Air Calibration

    Instruction Manual DO 6 14.1.4 Air Calibration Understanding the principle of air calibration is easy, once you know that it is partial pressure that the probe is responding to. When the probe is in air, it is measuring the partial pressure of oxygen in air. If water is air saturated, then the partial pressure of oxygen in the water will be the same as it is in air.
  • Page 72 Instruction Manual DO 6 In boiler water application, presence of oxygen in the water will increase corrosion and helps build up boiler scale that inhibits heat transfer. In such instance it is critical to keep DO concentration to a minimum. Some pollutants such as acid mine drainage produce direct chemical demands on oxygen in the water.

  • Page 73: Warranty

    If repair or adjustment is necessary and has not been the result of abuse or misuse within the designated period, please return – freight pre-paid – and correction will be made without charge. Eutech Instruments/ Oakton Instruments will determine if the product problem is due to deviations or customer misuse.

  • Page 74: Return Of Items

    Instruments will not be responsible for damage resulting from careless or insufficient packing. A restocking charge will be made on all unauthorized returns. NOTE: Eutech Instruments Pte Ltd/ Oakton Instruments reserve the right to make improvements in design, construction, and appearance of products without notice.
  • Page 76 For more information on Eutech Instruments/ Oakton Instruments’ products, contact your nearest distributor or visit our website listed below: Eutech Instruments Pte Ltd. Distributed by: Oakton Instruments Blk 55, Ayer Rajah Crescent, P.O Box 5136, #04-16/24 Singapore 139949 Vernon Hills, IL 60061, USA...

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