LaMotte DO 6 User Manual

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DO 6

Instruction Manual

Economy Hand-held Dissolved Oxygen Meter

Code 5-0107

PREFACE

WARNING! This set contains chemicals

that may be harmful if misused. Read

cautions on individual containers

carefully. Not to be used by children

except under adult supervision

This manual serves to explain the use of the Dissolved Oxygen hand-held meter DO 6.

This manual functions in two ways: first as a step by step guide to help you operate the meter; second, it serves as a handy reference guide. This manual is written to cover as many anticipated applications of the DO 6 hand-held meter as possible. The information presented in this manual is subject to change without notice.

TABLE OF CONTENTS

1 Introduction.............................

2 Display & Keypad Functions ....................5

2.1 Display ................................ 5

2.2 Keypad ................................

3 Preparation ............................. 7

3.1 Inserting & Removing Rubber Boot ................. 7

3.2 Inserting the Batteries ........................ 8

3.3 Battery Replacement ......................... 8

3.4 Dissolved Oxygen Probe Information................. 9

3.5 Connecting the Probe to Meter ................... 10

3.6 Switching the Meter On....................... 11

3.7 Measurement Mode Selction:-Percentage Saturation (%),

Concentration (mg/L) (ppm) and Temperature (T) ........12

4 Calibration ............................ 13

4.1 Important Information on Meter Calibration ........... 13

4.2 Preparing the Meter for Calibration ................. 14

4.3 Temperature Calibration ...................... 15

4.4 Dissolved Oxygen Calibration in % Saturation ...........16

4.4.1 To calibrate 100% Saturation ................. 16

4.4.2 To calibrate 0% Saturation .................. 17

4.5 Dissolved Oxygen Calibration in mg/L or ppm Concentration

Mode................................ 18

4.5.1 To calibrate in mg/L (ppm) Concentration mode: ......18

5 Measurement ........................... 19

5.1 With Automatic Temperature Compensation (ATC) .......19

5.2 Manual Temperature Compensation ................ 20

5.3 Taking Measurements ........................ 21

5.3.1 To take measurements: .................... 21

5.4 Taking Pressure/Salinity Compensated DO Measurements .....21

5.4.1 Pressure Setting Adjustment ................. 22

5.4.2 Salinity Setting Adjustment.................. 23

6 Hold Function ...........................25

7 Advanced Setup Funtions ..................... 25

7.1 Advanced Setup Overview ..................... 25

7.1.1 To enter the % Saturation or Temperature Set Up menu: . . 25

7.1.2 To enter the mg/L (ppm) Concentration Set Up menu: . . . 26

7.2 (COF.1) Configuration Menu .................... 28

7.2.1 Selection of Automatic Temperature Compensation .....28

7.2.2 Selection of mg/L or ppm mode ................ 29

7.3 (CAL.2) Calibration Data...................... 30

7.3.1 Viewing the % Saturation calibration data ..........30

7.3.2 Viewing the mg/L (ppm) Concentration calibration data . . 30

7.4 (ELE.3) Electrode Properties .................... 30

7.4.1 Viewing the electrode Slope Factor .............. 31

7.4.2 Viewing the % Saturation Offset (only available in % Saturation

or Temperature Set up menu): ................... 31

7.4.3 Viewing the 100% Saturation mV value ........... 31

7.4.4 Viewing the 0% Saturation mV value ............ 31

7.5 (A

TO.4) Automatic Off ....................... 33

7.6 (

RST.5) Reset to Factory Default .................. 33

7.6.1 Calibration Reset ....................... 34

7.6.2 User Reset ........................... 35

7.7 (OFS.5) % Saturation Offset Adjustment.............. 36

7.8 (DP

R.7) Dissolved Oxygen Parameters ............... 37

7.8.1 Pressure Setting Adjustment ................. 37

7.8.2 Salinity Setting Adjustment ................. 39

8 Probe Care and Maintenance ................... 39

8.1 Probe Care .............................. 40

8.2 Pre-Membraned Caps Replacement .................40

8.3 To Replace the Probe Pre-Membraned Cap............. 40

8.4 Electrolyte Solution ......................... 41

9 Trouble-Shooting Guide ..................... 42

10 Error Messages ...........................43

11 Factory Default Settings ......................44

12 Specifications ...........................46

13 Accessories ............................ 48

14 Additional Information......................48

14.1 Dissolved Oxygen ......................... 48

14.1.1 General Information ..................... 48

14.1.2 Measurement Units ..................... 49

14.1.3 What is Being Measured ................... 49

14.1.4 Air Calibration........................ 50

14.1.5 Applications ......................... 51

15 Limited Warranty .........................51

16 Return of Items ..........................52

1 INTRODUCTION

CAL

Low Battery annunciator

Calibration Mode Annunciator

14-segment Liquid Crystal Display

Percentage (Percentage Saturation Mode)

parts per million

milligram per litre (Concentration Mode)

ATC annunciator

Temperature Mode

mg/L

ppm %

8.8.8.8

Thank you for purchasing the DO 6 Dissolved Oxygen palm-top meter. This economy microprocessor-based hand-held 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. Temperature measurement is also available in degrees Celsius. The meter ensures accurate measurement of the Dissolved Oxygen values through its temperature, barometric pressure and salinity compensation features.

Your meter includes a dissolved oxygen probe, refill solution, a rubber boot, 4 alkaline “AAA” batteries, and instruction manual.

Please read this manual thoroughly before operating your meter.

To order other accessories and standard solutions, please refer to the Section on Accessories for more information.

2 DISPLAY & KEYPAD FUNCTIONS

2.1 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 or ppm) and Temperature measurement mode in degrees Celsius (T). Other annunciators include “A” (when the ATC function is activated), “CAL” (when meter is in calibration mode) and battery diagram for low battery condition. See Figure 1.

Figure 1, Active LCD display for DO6

2.2 Keypad

OFF

CAL

HOLD

ENTER

MODE

The DO 6 meter has 6 keys on its splash-proof keypad; ON/OFF, HOLD/ENTER CAL, MODE,

p and q 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.

CAL – Activates the calibration mode for Percentage Saturation, Concentration and Temperature calibrations.

Deactivates calibration or setup without confirming a value in calibration mode.

HOLD -Activates/Deactivates freezing of the measured reading while in measurement mode.

ENTER - Confirms the calibration values in Calibration mode and the selections in the SETUP menu.

pq – Sets the calibration values during the Concentration and Temperature calibration.

Scrolls through each SETUP and its sub group menu. Set offset adjustments and configuration settings.

MODE - Selects the measurement option between DO Percentage Saturation measurement; DO Concentration measurement and Temperature measurement.

When pressed together with ON/OFF key during power on, SETUP mode is selected. This menu allows meter customization with preferences such as activating ATC selection, DO concentration measurement unit selection, viewing of the last calibration data, viewing of the electrode properties, selecting the auto power off, resetting calibration data or meter settings back to factory default, setting the offset adjustments, setting barometric pressure in Hg or PA for barometric pressure compensation and setting of the salinity value for salinity compensation.

3 PREPARATION

3.1 Inserting & Removing Rubber Boot

1. 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

2.. 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. Lift up the stand at the back of meter for bench top applications if necessary.

Figure 2: Inserting or removing the rubber boot

3.2 Inserting the Batteries

3.0

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:

1. Push in the direction of arrow and lift up the cover.

2. Note the polarity of battery before inserting into position.

3. After replacement, place cover back and press down until it locks tight.

Figure 3: Inserting the batteries

3.3 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.

3.4 Dissolved Oxygen Probe Information

16 mm

12 mm

Detachable Pre-membraned Cap (Probe Sensing Area)

Figure 5: 12 mm Galvanic DO probe

The DO 6 hand-held 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.

Your DO Probe has a twin cable, one with a BNC connector for the DO measurement input, and the other with a phono jack plug for the temperature measurement input. Its sensing area consists of a cathode, anode, and an inner electrolyte which is separated from your sample solution by an oxygen permeable membrane pre-membraned to the probe’s detachable cap. Reconditioning of your probe is made easy with the introduction of this specially designed detachable pre-membraned cap.

This light weight probe has a built-in temperature sensor for Automatic Temperature Compensation (ATC) with 12mm diameter epoxy body housing and 16 mm diameter Noryl detachable cap. Its compact sensing area reduces air entrapment which makes it easy to obtain fast, accurate and stable readings. Simply stir the probe in the solution being measured. Shaking will aid to remove bubbles if needed before taking a reading. Also, always ensure to remove water drops from the membrane when calibrating in air.

Proper use of probe is essential to ensure that the optimum measurement is taken in a short 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. The whole pre-membraned cap has to be replaced if the membranedamaged. It is also important to keep the membrane clean so as to produce an optimum and accurate measurement.

See Section 8 - "Probe Care and Maintenance" for more information.

3.5 Connecting the Probe to Meter

BNC Connector for DO probe

Phono jack for Temperatureprobe

1. 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 6 below.

2. To remove, simply rotate the connector in counter-clockwise direction

until it unlocks, and slide the connector off the socket.

3. Plug the phono jack of temperature sensor into the phono socket of the

meter as shown in Figure 6 below.

Caution: Do not pull or force the probe cord or the probe wires might disconnect.

Note: Keep connectors clean. Do not touch connector with soiled hands.

Figure 6: DO 6 probe to meter connections

3.6 Switching the Meter On

CAL 13 CAL 24

TAv g

1.00

10.00

D06

mg/L NTU

mg/L

ppm

%pH

8.8.8.8

OFF

When switching the meter on, it will go through a series of display, eventually showing the revision number of the meter 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 switched off.

Press ON/OFF key to power up your meter.

1. All LCD segments will light up

for 1.5 seconds.

2. The display will then

momentarily show the meter’s identification “DO 6” with the annunciators for percentage saturation mode and concentration mode.

3. The display continues to switch

to display meter’s revision number for 1.5 seconds before finally showing the measurement mode.

4. Either percentage saturation

measurement mode, concentration measurement mode or temperature measurement mode will be displayed following the previous measurement mode to which the meter is switched off.

Figure7: Power Up sequence

3.7 Measurement Mode Selection:- Percentage Saturation (%),

10.00

8.24

25.0

MODE

mg/L

Automatic Temperature Compensation

Percentage Saturation

Concentration Mode

Temperature Mode

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 or temperature measurement.

The customized annunciator shall indicate the selection of the measurement mode.

Figure 8: Measurement mode selection using the mode key

4 CALIBRATION

4.1 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. Therefore, it is very important to set the proper temperature, barometric pressure and salinity values in the meter prior to any calibration or measurement process. Since the dissolved oxygen measurements in % saturation will linearly affect the mg/L (ppm) concentration measurement, it is important that the meter has to be first calibrated in the % Saturation mode and temperature mode before commencing the mg/L (ppm) concentration mode calibration.

In % saturation calibration mode, the dissolved oxygen calibration values will vary according to the barometric pressure correction set in the meter. Therefore it is necessary to set the barometric pressure first before proceeding to % Saturation calibration. The following table is an example which explains the acceptance calibration values when % Saturation mode calibration is attempted under different absolute value and under two different barometric pressures.

% Saturation factory default value

less than 10% 0% 0%

10.1% to 49.9% Err.1 (error 1) Err.1 (error 1)

50% to 200% 100% 92.1%

Acceptance Calibration Value (760mmHg)

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 salinity of the calibration sample to the meter. The dissolved oxygen mg/L (ppm) concentration value can then be calibrated to the known sample concentration calibration value. Note that the concentration calibration

window is +/- 40% of the factory default value. However the minimum point of calibration is 2 mg/L.

When you recalibrate your meter in % saturation mode, old calibrations in % saturation will be replaced while the % saturation offset adjustment will be erased. However, recalibration in the mg/L (ppm) concentration mode will only replace the old calibration in the concentration mode and do not affect the calibration in the percentage saturation mode.

To completely recalibrate your meter, or when you use a replacement electrode, it is best to clear all calibration data. To erase all the old calibration data completely, see Section 7.6 (rSt.5) Reset to Factory Default.

4.2 Preparing the Meter for Calibration

Before starting calibration, make sure you are in the correct measurement mode and in the correct calibration sequence. The temperature and the % Saturation calibration must be done first before attempting to do the mg/L (ppm) Concentration calibration.

In % Saturation, the meter is able to perform either a one point calibration or a 2 point calibration. For one point calibration, it is recommended that you perform a 100% Saturation calibration in saturated air. If you opt for 2 point calibration, you can calibrate for 100% Saturation in saturated air and 0% Saturation using a zero oxygen solution. The meter will take several minutes to reach 0% Saturation value after submersion into the zero solution.

Rinse the probe well in the de-ionized (DI) water or rinse solution and wipe the probe carefully taking care of the membrane.

Calibrate the meter in all the modes to ensure the highest accuracy throughout the DO measurement range. In % Saturation calibration, should there be a 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%. The meter also will not perform the mg/L (ppm) Concentration calibration for an absolute value of less than 2.00 mg/L (ppm) or calibration which is out of its window tolerance of +/- 40% from the factory default value. An error message of “Err.1” will be indicated and will return the meter to the measurement mode.

All new calibration values will automatically override the existing data. It is recommended to calibrate the meter periodically and or if it is suspected to be inaccurate.

Always rinse the probe with either DI water or rinse solution before and after

CAL

HOLD

ENTER

24.3

25.0

“CO” will display for

1.5 seconds

24.3

CAL

25.0

CAL

Factory default Temperature Measurement

Figure 9: Temperature Calibration Sequence

each calibration/sample measurement. When calibrating in air, make sure that any water droplets from the probe’s membrane are removed.

For details please refer to Section 8 - PROBE CARE AND MAINTENANCE. Note: The DO 6 factory calibrated default value is in respect to 760mm Hg or

101.3 kPa barometric pressure (sea level). To set the barometric pressure to different value, see Section 5.4.1 Pressure Setting Adjustment.

4.3 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 DO 6 automatically compensate for temperature using the temperature sensor that is built into the DO probe. However, it is possible to manually enter a known temperature to the meter (manual temperature compensation). The built-in temperature sensor of the DO 6 probe is factory calibrated. However, the temperature can be re-calibrated if needed and is recommended when a replacement probe is used.

Before calibration, ensure that the meter displays annunciator “A” to indicate that it is in automatic temperature compensation mode. Please see Set Up menu on page 36 for its activation procedure.

1. Switch the meter on. Press

MODE to select temperature mode. The display should show the annunciator “T” for temperature mode and“A” for automatic temperature compensation mode.

2. Dip the probe to a solution of known temperature (i.e. a temperature

CAL

HOLD

ENTER

83.0

CAL

100.0

“CO” will display for

1.5 seconds

A value with respect to the factory default calibration will be displayed

100.0

85.2

CAL

Calibration point will be displayed for 1.5 seconds

Figure 10: 100% Saturation Calibration

bath).Allow some time for the reading to stabilize.

3. Press the CAL key. The CAL indicator will appear and blinks above the

display. The temperature value displayed is with respect to the factory default calibration.

4. Press the p andq keys to adjust the meter reading to the correct

temperature value (i.e. the temperature of the temperature bath)

5. 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. Temperature calibration is restricted to ± 5°C from the factory default temperature measurement displayed during calibration.

4.4 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.

NOTE: If the barometric pressure setting has been changed from 760 mm Hg, the calibration value in air will automatically adjust to a value other than 100%. The adjusted value will be correct for the new barometric pressure setting.

See Section 5.4.1 Pressure Setting Adjustment on page 26 to change the pressure setting.

4.4.1 To calibrate 100% Saturation:

1. Rinse the probe well with DI water or

rinse solution. Do not touch the membrane.

2. Press the MODE key to select the %

Saturation mode.

3. Hold the probe in the air with the sensor facing downwards. Wait for the

CAL

HOLD

ENTER

3.0

CAL

0.0

“CO” will display for

1.5 seconds

A value with respect to the factory default calibration will be displayed

0.0

5.2

CAL

Calibration point will be displayed for 1.5 seconds

Figure 1: 0% Saturation Calibration

reading to stabilize.

4. Press the CAL key. The display will show the intended percentage

calibration point (100%) with a CAL indicator at the top corner for 1.5 seconds. The CAL indicator will then blink and the display will show a value which is with respect to the factory default calibration. 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.

5. Press the HOLD/ENTER key to confirm the calibration. The meter

displays “CO” for 1.5 seconds and automatically calibrates to 100.0% air saturation and returns to measurement mode.

Note: You can offset your % DO calibration. See Section 7.7 (OFS.6) % Saturation Offset Adjustment for directions.

6. Press the HOLD/ENTER key to confirm

the calibration. The meter displays “CO” for 1.5 seconds and automatically calibrates to 0.0% Saturation and returns to measurement mode.

4.4.2 To calibrate 0% Saturation

1. Rinse the probe well with DI water or

2. Press the MODE key to select the %

3. Dip the probe into the zero oxygen

4. Press the CAL key. The display will

Note: When calibration is attempted on a factory calibrated absolute value

rinse solution.

Saturation mode, if necessary.

solution. Wait for the reading to stabilize.

show the intended percentage calibration point (0%) with a CAL indicator at the top corner for 1.5 seconds. The CAL indicator will then blink and the display will show a value which is with respect to the factory default calibration.

measurement of 10.1% to 49.9%, the

CAL

HOLD

ENTER

8.1 6

8.24

A mg/L

“CO” will display for

1.5 seconds

9.00

mg/L

8.24

mg/L

Factory default Temperature Measurement

Figure 9: Temperature Calibration Sequence

CAL

display will show the absolute value measurement for 1.5 seconds before displaying Err.1 and goes to the measurement mode.

5. Press the HOLD/ENTER key to

confirm the calibration. The meter displays “CO” for 1.5 seconds and automatically calibrates to 0.0% Saturation and returns to measurement mode.

4.5 Dissolved Oxygen Calibration in mg/L or 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.

This meter also lets you make a calibration adjustment in mg/L (ppm) Concentration mode without affecting your % Saturation calibration.

To select between mg/L and ppm units, see page 38 mode"

4.5.1 To calibrate in mg/L (ppm) Concentration mode:

1. Calibrate 100% Saturation as per

Section 4.4.

2. Rinse the probe well with DI water or

rinse solution. Wipe the outside of the probe carefully (do not touch the membrane).

3. Dip the probe into a sample of known

oxygen concentration. Wait for the reading to stabilize.

4. Press the MODE key to select the

mg/L (ppm) Concentration mode.

, "Selection of mg/L or ppm

5. Press the CAL key. The display will show a value which is with

83.0

Automatic Temperature Compensation activated

Figure 8: Automatic Temperature Compensation

respect to the factory default calibration with a CAL indicator blinking at the corner of the display.

6. Press the p andq keys to adjust the reading to the known oxygen

concentration of the sample.

7. Press the HOLD/ENTER key to confirm the calibration. The meter

will display “CO” for 1.5 seconds and automatically calibrates to the value you have entered and returns to the measurement mode.

NOTES: The concentration calibration window is +/- 40% of the factory default value. However, the minimum point of calibration is 2 mg/L. In an event where the default measured value is less than 2 mg/L and a calibration is attempted, the display will show “2.00” and then error message “Err.1” will be displayed momentarily before returning to measurement mode.

You can change the barometric pressure value and salinity value in the mg/L (ppm) Set Up menu (see Section and for and ). Please refer to page if you are intending to use manual temperature compensation.

5 MEASUREMENT

The DO 6 meter is capable of taking measurements with automatic or manual temperature compensation.

5.1 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” will be blinking if the ATC probe is disconnected. Activate the “A.ATC” mode in the set up menu, if necessary. See page

36.

5.2 Manual Temperature Compensation

CAL

HOLD

ENTER

25.0

25.5

“CO” will display for

1.5 seconds

25.0

CAL

25.5

mg/L

CAL

Last set manual temperature setting

Figure 3: Manual Temperature Compensation value selection sequence.

For manual temperature compensation, simply deactivate the “A.ATC” mode as explained in the set up menu on page . The automatic temperature compensation annunciator “A” will not be displayed to represent that the meter is in manual temperature compensation mode.

To use manual temperature compensation, you need to enter the temperature value of your process into the meter. You can select any temperature between 0 and 50 °C. Default value is 25 °C.

1. Switch on the meter and if

2. Press CAL key to start

3. The “CAL” indicator will start

4. Check the temperature of your

5. Press the HOLD/ENTER key to

necessary, press MODE key to select temperature measurement mode.

temperature calibration process.

blinking and the display will show the last manual set temperature value.

sample using an accurate reference thermometer. Wait for the thermometer value to stabilize. Press the p or q key of your meter to manually set its temperature value according to the value of the reference thermometer used.

confirm the manual temperature setting made. The “CO” indicator will appear for 1.5 seconds before the display returns to the measurement mode.

5.3 Taking Measurements

70.5

5.80

24.3

MODE

mg/L

Figure 4: Measurement mode

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 on the membrane before taking a reading.

IMPORTANT: Since the DO probe consumes oxygen from the sample, the sample must constantly flow past the membrane to achieve more accurate readings. You can use a stirrer to accomplish this.

5.3.1 To take measurements:

1. Rinse the probe well with DI water or

rinse solution.

2. Select the appropriate measurement

mode. Press the MODE key to toggle between modes:

a. Percentage Saturation (%) b. Concentration (mg/L) or (ppm) c. Temperature (T)

3. Dip the probe into the sample. Stir

the solution gently to homogenize the sample. Make sure that the sample is continuously flowing past the membrane sensor.

4. Take your measurements once your meter reading has stabilized. Note: “Ur”/”Or” will be displayed if the instruments exceeds the specified

measuring range. See Section for range specification. To select between mg/L and ppm units, see Set Up menu on page 38.

5.4 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. Salinity setting feature, on the other hand, will only be available when Set Up menu is derived from the mg/L (ppm) Concentration mode. See Section - Advanced Setup Overview for more information.

During measurement, the DO meter will automatically compensate for salinity and pressure based on the values entered in the Set Up Menu. The meter is factory set at 760 mm Hg (101.3 kPa) barometric pressure setting and a salinity factor of 0.0 ppt.

5.4.1 Pressure Setting Adjustment

(See Figure 16 for flow chart explanation)

1. Switch off your meter in mg/L (ppm) Concentration mode.

2. While pressing and hold the MODE key, switch on the meter by pressing

the ON/OFF key.

3. Once the ON/OFF key is released, the meter will enter the Set Up menu

by displaying “SEt.P”. By releasing the MODE key, the display will show the configuration menu “COF.1”. See section – Advanced Setup Functions

4. Press the p and q keys to scroll through the Set Up main group menu till

the display shows “DPr.7”.

5. Press the HOLD/ENTER key and the meter will enter the barometric

pressure units selection menu with the display showing one of two; either “A.HG” for mm Hg or “A.PA” for kilo Pascal, depending on what the meter’s last set up was.

6. Use the p and q keys to toggle between the two units of pressure

measurement and press the HOLD/ENTER key to confirm selection.

7. Use the p and q 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”. If the Set Up menu is derived from other than the mg/L (ppm) Concentration mode, the meter will return to the Set Up main group menu “DPr.7”.

8. Press CAL key to return to measurement mode, or continue to make a

salinity setting adjustment.

5.4.2 Salinity Setting Adjustment

.sal

HOLD

ENTER

HOLD

ENTER

0.0

45.2

“CO” will display for 1.5 seconds

Display will return back to “DPr.7” subgroup menu

Figure 5: Salinity Setting Adjustment Sequence

NOTE: This mode is available only from the mg/L (ppm) Concentration Set Up menu.

1. Repeat steps 1 to 5 as in the

steps of Pressure Setting Adjustment.

2. Press the HOLD/ENTER key

twice till the meter displays the Salinity setting mode “b.SAL”.

3. Press the HOLD/ENTER key

to enter the Salinity setting mode.

4. Use the p and q keys to enter

5. Press HOLD/ENTER key to

6. Press CAL key to return to the

the salinity of your solution in parts per thousand (ppt). Factory default is 0.0. Salinity values up to 50 ppt can be entered.

confirm the value. A confirmation indicator “CO” will be displayed for 1.5 seconds before returning to the main group menu “DPr.7”.

measurement mode.

HOLD

ENTER

HOLD

ENTER

HOLD

ENTER

HOLD

ENTER

760

HOLD

ENTER

750

101.3

105. 2

“CO” will display for 1.5 seconds

Display will continue to Salinity setting menu “b.SAL” if Set Up menu is entered from mg/L (ppm) mode. Otherwise display will return back to “DPr.7”

Figure 16: Pressure Setting Adjustment Sequence

6 HOLD Function

70.5

Annunciator Blinks when meter is in “HOLD” mode

Figure 68: Unit in HOLD mode

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

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.

2. To release the held value, press the HOLD/ENTER again. The

annunciator will stop blinking to indicate that the held value has been released.

3. Continue to take measurements.

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.

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 To enter the % Saturation or Temperature Set Up menu:

1. Make sure that the meter is switched-off while in the % Saturation or

Temperature measurement mode.

2. With the MODE key pressed, power the unit on by pressing the ON key.

COF.1

ELE.3

CA L.2

Release the ON key before releasing the MODE key.

3. “SEt.P” indicator will appear momentarily and “COF.1” will appear next.

4. You are now in the % Saturation or Temperature Set Up menu.

7.1.2 To enter the mg/L (ppm) Concentration Set Up menu:

1. Switch off the meter in the mg/L (ppm) Concentration measurement

mode.

2. 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.

SEt.P - Enter Set Up Menu

COF.1 – Enter Configuration Menu A.ATC –Selection for automatic temperatur 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

OF5.6

Figure 79: Overview of DO 6% Saturation or Temperature Setup Menu

Switch off from % Saturation or Temperature measurement mode. Press and hold MODE key and then switch on.

SEt.P will display for 1 second

MODE

OFF

COF.1

CA L.2

ELE. 3

OF5.6

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)

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)

Figure 19: Overview of DO6 Concentration Set up Menu

Switch off from Concentration measurement mode. Press and hold MODE key and then switch on.

SEt.P will display for 1 second

MODE

OFF

COF.1

CA L.2

ELE. 3

Figure 20: Selection of Automatic or

Manual Temperature

Compensation

COF.1

A.AT c

yes

HOLD

ENTER

HOLD ENTER

7.2 (COF.1) Configuration Menu

In this menu, the meter lets you configure the selection of automatic temperature compensation (A) and the selection of mg/L or ppm mode for the mg/L (ppm) Concentration measurement mode. (Second feature is only available in mg/L (ppm) Concentration Set Up menu)

7.2.1 Selection of Automatic Temperature Compensation

From "COF".1" of any Set Up menu.

1. 1.Press the HOLD/ENTER key for the display to show the Automatic

Figure 21: Selection of mg/L or ppm

mode

mg/L

ppm

Temperature Compensation selection menu “A.ATC”.

2. Press the HOLD/ENTER key to enter the ATC selection menu.

3. Use the p and q keys to either activate or deactivate the ATC feature.

a. YES – activates the ATC b. NO – deactivates the ATC and activates the Manual temperature

compensation

4. Press the HOLD/ENTER key to confirm your selection. 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.

7.2.2 Selection of mg/L or ppm mode

From the “COF.1” of the mg/L (ppm) Concentration Set Up menu,

1. Press the HOLD/ENTER key thrice

to enter the mg/L or (ppm) mode selection menu “b.DO”.

2. Use the ? and ? keys to select the

desired mode of measurement.

3. Press the HOLD/ENTER key to

confirm the selection made and to return to the subgroup menu.

4. Press the CAL key to return to the

measurement mode.

7.3 (CAL.2) Calibration Data

10.00

8.24

CAL

Figure 22: Viewing the last calibration data for each measurement range.

CA L.2

HOLD

ENTER

Display will show the latest % saturation Calibration if set up menu is selected from the DO%Saturation Mode

Display will show the latest mg/L or ppm calibration if set up menu is selected from the DO mg/L (ppm) Concentration Mode

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.

7.3.1 Viewing the % Saturation calibration dat

From the % Saturation or Temperature Set Up menu,

1. Press the p and q keys to

scroll through the main group to enter the viewing menu “CAL.2” for the latest calibration data.

2. Press HOLD/ENTER key to

view the latest % Saturation calibration data.

To exit to the main group menu, press the HOLD/ENTER key or the CAL key

3. To exit to the main group

menu, press the HOLD/ENTER key or the CAL key.

4. Press the CAL key to return to the measurement mode.

7.3.2. Viewing the mg/L (ppm) Concentration calibration data

From the mg/L (ppm) Concentration Set Up mode,

1.. Repeat process 1 to 4 above to view the latest mg/L (ppm) Concentration

calibration data. at steps 1-5 until all points have been calibrated.

7.4 (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. These electrode properties can be examined through its data in % Saturation and mg/L (ppm) Concentration which is available in their Set Up menu respectively.

7.4.1 Viewing the electrode Slope Factor

This parameter lets you view and gives an indication of the probe’s efficiency. The value displayed is the ratio of the actual value produced by the probe to the theoretical value. The higher the number, the lower the mV output from the probe. The ratio displays from 0.5 to 1.999.

From the % Saturation or Temperature Set Up menu,

1. Enter the Set Up menu & scroll by using the p and q keys until the

meter displays the Electrode Properties menu “ ELE.3”

2. Press the HOLD/ENTER key to enter the menu and view the Slope Factor

of the electrode..

3. The display will momentarily shows “FACT” before displaying the slope

factor value.

7.4.2 Viewing the % Saturation Offset (Only available in % Saturation or Temperature Set Up menu):

This parameter shows you the amount of the % Saturation Offset entered in the other parameter “OFS” (refer to Section for instructions).

From Step 3 above,

4. Press the HOLD/ENTER key to enter the % Saturation Offset viewing

5. The meter will display “OFS” momentarily before displaying the last offset

adjustment made.

7.4.3 Viewing the 0% Saturation mV value

This parameter show the sensor's mV output corresponding to 100% Saturation. From Step 5 above,

6. Press the HOLD/ENTER key. The display will show "HI.mV" momentarily

before displaying the sensor's mV output with respect to 100% Saturation.

7.4.4 Viewing the 0% Saturation mV value

This parameter lets you view the sensor’s mV output corresponding to 0% Saturation. From step 6 above.

7. Press the HOLD/ENTER key. The display will show “LO.mV”

HOLD

ENTER

HOLD

ENTER

HOLD

ENTER

HOLD

ENTER

“LO.mV” will display for 1.5 seconds

“FACT”displays for 1.5 seconds

“OFS” displays for 1.5 seconds

“HI.mV” displays for 1.5 seconds

Viewing of the offset percentage adjustment will be available only if set up menu is selected from the DO% Saturation of the Temperature Mode. Otherwise, this menu will be skipped.

Figure 23: Viewing electrode data sequence

momentarily before displaying the sensor’s mV output value with respect to 0% Saturation.

8. Press the HOLD/ENTER key again to exit to the main group menu. Press

CAL to return to the measurement mode.

Note: To view the electrode properties in the mg/L (ppm) Concentration mode, repeat the whole steps above using the mg/L (ppm) Concentration Set Up menu. Viewing of the % Saturation Offset will be skipped in this menu.

7.5 (AtO.4) Automatic Off

HOLD

ENTER

Figure 24: Selection of Automatic

Off function

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,

1. Scroll the Set Up main group menu

by using the ? and ? keys until the meter displays the Automatic Off menu “AtO.4”.

2. Press the HOLD/ENTER key to enter

the menu.

3. Use the p and q keys to activate or

deactivate the automatic off selection.

a. YES – activates Automatic Off b. NO – deactivates Automatic Off

4. Press the HOLD/ENTER key to

confirm the selection.

5. Press the CAL key to exit the Set Up menu to return to the measurement

mode.

7.6 (rSt.5) Reset to Factory Default

This mode lets you reset all parameters to factory default settings. There are two levels of reset:

1. Calibration Reset: - Reset only the calibration values. This clears all

previous calibrated values and reset to factory default. See Section for factory default settings.

2. User Reset: - Clears all data including calibration and other customized

setup functions and reset it to factory default. See Section 11 for factory default settings.

7.6.1 Calibration Reset

HOLD

ENTER

HOLD

ENTER

Figure 25: Calibration reset

selection

Calibration Reset

From any Set Up menu:

1. Scroll the Set Up main group menu by

using the p and q keys until the meter displays the Reset to Factory Default menu “rSt.5”.

2. Press the HOLD/ENTER key to enter

the menu.

3. Press the HOLD/ENTER key to enter 4.

Use the p and q keys to activate or deactivate the Calibration Reset selection.

a. YES – activates Calibration Reset b. NO – deactivates Calibration Reset

5. Press HOLD/ENTER key to confirm the

selection made.

6. 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.

Note: When you reset your meter from % Saturation Set Up menu, both % Saturation and mg/L (ppm) Concentration calibrations are reset to factory default. However, calibration reset in the mg/L (ppm) Concentration Set Up menu will only reset the calibration in the concentration mode and do not affect the calibration in the percentage saturation mode.

7.6.2 User Reset

HOLD

ENTER

Figure 26: User Reset Selection

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

From “rSt.5” menu,

1. Press HOLD/ENTER key

three times until meter displays the User Reset menu “b.USR”

2. Press HOLD/ENTER key

to enter the menu.

3. Use the p and q keys to

activate or deactivate the User Reset selection.

a. YES – activates User Reset

b. NO – deactivates User Reset

4. Press HOLD/ENTER key

to confirm the selection made.

5. 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.

7.7 (OFS.6) % Saturation Offset Adjustment

HOLD

ENTER

HOLD ENTER

Figure 27: % Saturation Offset

Adjustment

Measured reading based on last percentage saturation calibration is displayed momentarily

HOLD

ENTER

“CO” will display for

1.5 seconds

Display will return to “OFS.6” subgroup menu

This is a useful feature that allows you to offset meter’s value when cross referenced with another DO meter. That way, it can be 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 viewed in the Electrode Properties menu “ELE.3”.

From the % Saturation measurement mode,

1. Dip the DO electrode in the sample

solution and allow the reading to stabilize.

2. Check the reading of another DO

meter being used as a reference. This reference meter should have its probe immersed in the same sample solution and at the same depth.

3. Switch off your meter and enter the

% Saturation Set Up menu.

4. Scroll the Set Up main group menu

by using the p and q keys until the meter displays the % Saturation Offset Adjustment menu “OFS.6”.

5. Press the HOLD/ENTER key to

enter the menu. The display will momentarily show the measured reading based on the last calibration before displaying the last offset adjusted value.

6. Use the p and q keys to enter the new value.

7. 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.

8. Press CAL key to exit the Set UP menu to return to the measurement

mode.

Note: When a user calibration is done, the offset gets reset to zero.

7.8 (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.

The Set Up menu for barometric pressure correction is “A.Hg” (for mmHg) and “A.PA” (for kilo Pascal) whereas the Salinity menu is indicated as “b.SAL”.

7.8.1 Pressure Setting Adjustment

1. Switch off your meter in mg/L (ppm) Concentration mode.

2. While pressing and hold the MODE key, switch on the meter by pressing

the ON/OFF key.

3. Once the ON/OFF key is released, the meter will enter the Set Up menu

by displaying “SEt.P”. By releasing the MODE key, the display will show the configuration menu “COF.1”.

4. Press the p and q keys to scroll through the Set Up main group menu till

the display shows “DPr.7”.

5. Press the HOLD/ENTER key and the meter will enter the barometric

pressure unit selection menu with the display showing either the “A.HG” mode or “A.PA” mode.

6. Use the p and qkeys to toggle between the barometric pressure units and

press the HOLD/ENTER key to confirm selection.

7. Use the p and q keys to set the pressure value and press the

8. Press CAL key to return to measurement mode, or continue to make a

salinity setting adjustment.

HOLD

ENTER

Figure 28: Pressure Setting Adjustment Sequence

HOLD

ENTER

HOLD

ENTER

HOLD

ENTER

“CO” will display for

1.5 seconds

HOLD

ENTER

HOLD

ENTER

HOLD

ENTER

“CO” will display for

1.5 seconds

Display will continue to Salinity setting menu “b.SAL” if Set Up menu is entered from mg/l (ppm) mode. Otherwise display will return back to “DPr.7”

7.8.2 Salinity Setting Adjustment

.sal

HOLD

ENTER

HOLD

ENTER

0.0

45.2

“CO” will display for 1.5 seconds

Display will return back to “DPr.7” subgroup menu

Figure29: Salinity Setting Adjustment Sequence

Note: This mode is available only from the mg/L (ppm) Concentration Set Up menu.

1. Repeat steps 1 to 5 as in the steps

of Pressure Setting Adjustment.

2. Press the HOLD/ENTER key twice

till the meter displays the Salinity setting mode “b.SAL”.

3. Press the HOLD/ENTER key to

enter the Salinity setting mode.

4. Use the p and q keys to enter the

salinity of your solution in ppt.

Note: The salinity value is in ppt (parts per thousand)

5. Press HOLD/ENTER key to

confirm the value. A confirmation indicator “CO” will be displayed for

1.5 seconds before returning to the subgroup menu “DPr.7”.

6. Press CAL key to return to the

measurement mode.

8 PROBE CARE AND MAINTENANCE

The DO 6 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 the anode, a cathode, and the dual cable.

· A lower part consisting of a pre-membraned cap, and electrolyte solution.

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. The probe uses very little oxygen for its measurement. This enables it to function correctly with liquid movement as low as 2 inch/sec across membrane.

The permeability of the membrane to oxygen varies greatly with temperature. Therefore compensation is needed for this variation. The DO6 probe comes with an in-built Temperature Compensation for the membrane variation.

8.1 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. After using the probe, rinse the probe with clean water and wipe it with a soft cloth or paper to avoid any hardening of deposits if necessary. If growth develops on the probe, use a disinfecting chemical to clean. NOTE: Although the membrane is strong and not easily damaged, wipe it gently while cleaning it. If the membrane is damaged or torn, the probe will no longer function.

There are no special probe storage requirements.

8.2 Pre-Membraned Caps Replacement

Replacement of the pre-membraned cap is required only when you cannot calibrate the probe, or if the membrane is damaged.

Typical membrane damages are punctures or wrinkles caused during measurements or cleaning.

To order replacement probe components or a replacement probe, see Section “Accessories” on page 48.

8.3 To replace the probe pre-membraned cap.

1. Unscrew counter clockwise the pre-membraned cap from the probe sensing

tip and discard.

2. Wash the probe under running water.

3. Mount the nozzle tip onto the syringe provided. Fill the syringe with the

refill solution through the tip of the plastic bottle.

4. Hold the probe upside down. Insert the nozzle tip into one of the 4 holes

surrounding the silver cathode. Inject the fill solution into the probe body until solution leaks out from the fill hole (approximately 5 mL).

5. Replace pre-membraned cap by tightening clockwise until hand tightened.

6. Allow at least 1 hour for the electrode to equilibrate before usage.

Figure 30: probe pre membraned cap replacement process

8.4 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” section.

9 TROUBLE-SHOOTING GUIDE

Problem Cause Solution

No display when turned on

a) Batteries not in place b) Batteries not in

correct polarity (+ and – position).

c) Weak batteries

a. Remove rubber

b) Reinsert batteries

c) Replace batteries.

Unstable readings

a) Insufficient

electrolyte in probe.

a) Fill probe with

b) Air bubbles trapped

around the probe

b) Stir or tap probe to

c) Dirty or damaged

probe

d) Probe not deep

c) Clean the probe and

d) Make sure sample

enough in sample

e) External noise

pickup or induction

e) Move or switch off caused by nearby electric motor.

f) Replace probe.

f) Broken probe.

Slow response

a) Dirty / Oily probe. b) Temperature is

a) Clean probe. See

changing.

b) Allow time for

Not respondin gtokey press

a) HOLD operation

indicated by flashing display.

b) Damaged key pad

a) Cancel HOLD mode.

b) Return to dealer.

c) Reset all internal

c) Internal program

error.

boot/stand. Check that batteries are in place and making good contact.

with correct polarity.

electrolyte & replace pre-membraned cap

remove bubbles.

re-calibrate

entirely covers the probe sensors.

interfering motor.

“Probe Care & Maintenance”.

temperature to stabilize

programs by reinserting batteries.

10 ERROR MESSAGES

LCD Display Indicates Cause Solution

Low Battery indicator

Low battery level

Need new batteries or battery connection is bad.

Clean battery contacts. Replace batteries with fresh ones, noting polarity.

"Err 1"

in % Saturation Mode

% Saturation Calibration error

Calibration is performed when factory calibrated absolute value is out of calibration range –

10.1% to 49.9%

Check the value of the calibration solution. If zero calibration is done, make sure the limit of 10% is not exceeded. If message persist, recondition your probe.

"Err 1" in mg/L (ppm) Concentration

Mode

“UR”/”OR” with blinking “A” annunciator in Temperature Mode

“——“with blinking “A” annunciator in % Saturation and Concentration Mode

Concentration Calibration error

ATC probe error, Under Range, Over Range

ATC probe error

Calibration is performed when the calibration solution factory absolute measurement is below

2.00 mg/L or ppm

ATC probe is removed or broken while the meter has the ATC feature activated.

ATC probe is removed or broken while the meter has the ATC feature activated

Check the calibrating solution to be above 2 mg/L or ppm.

Check that the correct temperature and salinity setting has been set prior calibration.

Check the probe’s temperature input phono jack connection to the meter. Ensure probe is not broken or punctured.

11 FACTORY DEFAULT SETTINGS

Setting

COF.1 Unit Configuration Parameter Title

A.ATC Selection of

b.DO Selection of mg/L or

CAL.2 Viewing the latest

ELE.3 Viewing the Electrode

FACT View the Slope Factor Viewing Only Viewing Only 1.000

OFS Viewing the %

HI.mV Viewing the mV value

LO.mV Viewing the mV value

AtO.4 Selection of automatic

rSt.5 Reset to factory

A.CAL Selection of

b.USR Selection of User

Function Parameter

Opting Keys

Only

Automatic or Manual Temperature Compenstion

ppm of the concentration mode

calibration data

properties

Saturation offset adjustment

for 100% Saturation

for 0% Saturation

power off

defaults

Calibration Reset

Reset

p and q YES; NO YES

p and q mg/L or ppm mg/L

Viewing Only Viewing Only ----

Parameter Title Only

Viewing Only Viewing Only 0.0%

Viewing Only Viewing Only 50 mV

Viewing Only Viewing Only 0 mV

p and q YES; NO

Parameter Title Only

p and q NO, YES NO

p and q NO, YES 0.0%

Parameter

Optons

Parameter Title Only

Default

Setting

Function Parameter

Opting Keys

Parameter

Options

Default

Setting

OFS.6 Offset Adjustment (%

Saturation

DPr.7 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 Salinity Setting

Adjustment

Setting the Manual Temperature Compensation

p and q +/-10.0 of

Parameter Title Only

p and q 500 to 1499

p and q 66.6 to 199.9

p and q 0.0 to 50.0 ppt 0.0 ppt

CAL, p and q 0.0 to 50.0 °C 25.0 °C

measured reading

Parameter Title Only

mmHg

kPA

0.0%

760 mm Hg

101.3 kPA

Note: The HOLD/ENTER key is used to confirm every parameter opted.

12 SPECIFICATIONS

% Saturation Mode

Range Resolution Relative accuracy

mg/L (ppm) Concentration Mode

Range Resolution Relative accuracy

Temperature

Range Resolution Relative accuracy

Salinity Correction

Range Resolution Method

Barometric Pressure Correction (mm Hg)

Range Resolution Method

0.00 – 200.0 %

0.1 % ± 1.5% of Full Scale

0.00 – 20.00 mg/L or ppm

0.01 mg/L; 0.01 ppm ± 1.5% of Full Scale

-5.0 – 105.0 °C

0.1 °C ± 0.5 °C

0.0 – 50.0 ppt

0.1 ppt Automatic correction after manual input

500 to 1499 mm Hg or 66.6 to 199.9 kPA 1mmHgor0.1kPA Automatic correction after manual input

Automatic Temperature

0.0 to 50.0°C

Compensation

Manual Temperature

0.0 to 50.0°C

Compensation

Probe (DO / Temp) Galvanic / Thermistor

Probe Diameter Body 12 mm, Cap 16 mm

Response Time 60 seconds to achieve 95% of the

reading

% Saturation Calibration Points

100% in saturated air or air-saturated water.

0% in zero oxygen solution

% 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

Offset Adjustments (% Saturation)

+/- 5°C from factory default measurement

+/- 10.0 of reading in Saturation mode

HOLD function Yes

Auto-Off function Selectable Auto Off function. (20

minutes after last key press)

Display Customs Single 4 Digit LCD

Inputs BNC for DO & 2.5 mm Phono for

temperature

Operating Range 0 to 50 °C

Power Requirements 4 AAA-sized batteries (included)

Battery Life > 700 hours (Alkaline Batteries)

Dimensions Meter: 14 cm (L)x7cm(W)x3.5

cm (H) Probe: 115 mm (L) x 12 mm (Dia)

with 3-ft cable. Probe’s membrane housing: 16 mm

(Dia)

13 ACCESSORIES

Code

DO 6 meter and probe kit 5-0107

DO probe 26094-65

Replacement caps (2) with pre-installed membrane and 10-mL electrolyte

26094-66

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. 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.

1. Amount of DO increases with decreasing temperature (colder water holds

more oxygen);

2. Amount of DO increases with decreasing salinity (freshwater holds more

oxygen than saltwater does);

3. Amount of DO decreases with decreasing atmospheric pressure (amount of

DO absorbed in water decreases as altitude increases).

Solubility of oxygen in water contact with water saturated air at

standard atmospheric pressure

Solubility mg/L

0 102030405060

Temperature °C

14.1.2 Measurement Units

One measure of DO in water is parts per million (ppm) which is the number of oxygen molecules (O 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 multiplied by 100.

14.1.3 What Is Being Measured?

DO probes respond to the partial pressure of oxygen in liquid or gas being

2) per million total molecules in a sample. Calculating

measured – they measure the “pressure” of oxygen rather than concentration. All of the oxygen entering the probe is consumed at the cathode where it is

electrochemically reduced to hydroxyl ions producing an electrical current within the probe:

2 +2H2O+4e

à 4OH

–

Since all oxygen entering the probe is chemically consumed, the partial pressure of oxygen in the electrolyte is zero. Therefore, a partial pressure gradient exists across the membrane and the rate at which oxygen enters the probe is a function of the partial pressure of oxygen in the gas or in liquid being measured.

When a probe is placed in air saturated water, the current it produces will not be affected by the temperature or salinity of the water. The DO concentration in the water, however, will vary with temperature and salinity. Because it is convenient to report DO concentration in mg/L or ppm, it is necessary to adjust for temperature and salinity of the water to get correct readings in these units.

If DO were to be reported in terms of partial pressure or % Saturation, then temperature and/or salinity compensation for oxygen solubility would not be necessary. Most probes are temperature compensated – i.e. they convert the “partial pressure measurement” to mg/L of DO at whatever temperature the water happens to be at for a given salinity and barometric pressure.

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. 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.

Note: The closer the air calibration temperature to the water temperature, the more accurate is the calibration.

14.1.5 Applications

Oxygen is essential for fish, invertebrate, plant, and aerobic bacteria respiration. DO levels below 3 ppm are stressful to most aquatic organisms. Levels below 2 or 1 ppm will not support fish. Fish growth and activity usually require 5 to 6 ppm of DO, an important consideration for aquaculture industry. Low DO indicates a demand on the oxygen of the system. Natural organic material such as leaves accumulate in the stream and create an oxygen demand as it is decomposed. Organic materials 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. If DO level is too high, more power is used than necessary for aeration and the process becomes costly.

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. DO is consumed in the oxidation-reduction reactions of introduced chemical compounds such as nitrate (NO

(NH

), sulfate (SO42-), and sulfite (SO32-) and ferrous (Fe2+) and ferric (Fe3+)

) and ammonia

ions.

These are important consideration for water and wastewater treatment industry.

15 LIMITED WARRANTY

LaMotte Company warrants this instrument to be free of defects in parts and workmanship for 3 years from the date of shipmen and this probe to be free of defects in parts and workmanship for 6 months from the date of shipment. If it should become necessary to return the instrument for service during or beyond the warranty period, contact our Technical Service Department at 1-800-344-3100 for a return authorization number or visit www.lamotte.com for troubleshooting help. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. LaMotte Company specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. LaMotte Company’s total liability is limited to repair

or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.

16 RETURN OF ITEMS

Should it be necessary to return the instrument for repair or servicing, pack instrument carefully in suitable container with adequate packing material. A return authorization number must be obtained from LaMotte Company by calling 1-800-344-3100. Attach a letter with the authorization number to the shipping carton which describes the kind of trouble experienced. This valuable information will enable the service department to make the required repairs more efficiently.

LaMOTTE COMPANY

Helping People Solve Analytical Challenges®

802 Washington Ave. • PO Box 329 • Chestertown • Maryland • 21620

USA800-344-3100 • 410-778-3100 • Fax 410-778-6394

Visit us on the web at www.lamotte.com

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LaMotte DO 6 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual