Nova-Tech DO 6+ User Manual

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Instruction Manual

DO 6+ Dissolved Oxygen/Temp

68X243634 Rev 0 Mar 09

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Part of Thermo Fisher Scientific

Instruction Manual DO 6+

Preface

This manual serves to explain the use of the DO 6+ hand held meter.

This manual functions in two ways: first as a step by step guide to help you operate the meter; second, as a handy reference guide.

This manual is written to cover as many anticipated applications of the DO 6+ meter as possible. If there are doubts in the use of this meter, please do not hesitate to contact the nearest Eutech Instruments Authorized Distributor.

Eutech Instruments will not accept any responsibility for damage or malfunction to the meter caused by improper use of the instrument.

The information presented in this manual is subject to change without notice as improvements are made, and does not represent a commitment on the part of Eutech Instruments.

Eutech Instruments Pte Ltd

Instruction Manual DO 6+

Table of Contents

1. INTRODUCTION ...............................................................1

2. GETTING STARTED.........................................................2

2.1 Description of Keypad Functions ...................................................................2

2.2 Description of LCD Annunciators...................................................................3

2.3 Inserting & removing the rubber armour / stand.............................................4

2.4 Inserting New Batteries.................................................................................4

2.5 Battery Replacement .....................................................................................5

2.6 Connecting the Electrode...............................................................................5

2.7 Electrode Information.....................................................................................6

2.8 Switching the Meter On .................................................................................7

2.9 Changing Mode ............................................................................................. 7

3. CALIBRATION..................................................................8

3.1 General Information.......................................................................................8

3.2 Temperature Calibration................................................................................10

3.3 % Saturation Calibration................................................................................11

3.3.1 100% Calibration ...............................................................................11

3.3.2 0% Calibration ...................................................................................12

3.4 mg/L or ppm Calibration ................................................................................13

4. MEASUREMENT ..............................................................14

4.1 Temperature Compensation ..........................................................................14

4.2 Taking Measurements ................................................................................... 15

4.3 Pressure & Salinity Compensated Measurements.........................................16

4.4 Holding a Reading .........................................................................................16

5. SETUP...............................................................................17

5.1 Configuration Menu (COF.1)..........................................................................21

5.2 Automatic Temperature Compensation (A.ATC)............................................21

5.3 Selection of mg/L or ppm (b.DO) ...................................................................22

5.4 Calibration Data (CAL.2)................................................................................22

5.5 Electrode Data (ELE.3)..................................................................................23

5.6 Automatic Shut Off (AtO.4)............................................................................24

5.7 Reset to Factory Default (rSt.5) .....................................................................25

5.8 % Saturation Offset Adjustment (OFS.6) .......................................................26

5.9 Pressure & Salinity Adjustment......................................................................27

6. PROBE MAINTENANCE ..................................................29

6.1 Cap and Electrolyte Replacement..................................................................30

6.2 Electrolyte Solution........................................................................................ 31

7. TROUBLESHOOTING......................................................31

8. ERROR MESSAGES ........................................................32

Instruction Manual DO 6+

9. FACTORY DEFAULT SETTINGS ....................................33

10. SPECIFICATIONS ............................................................34

11. REPLACEMENTS AND ACCESSORIES.........................36

12. DISSOLVED OXYGEN THEORY .....................................37

Measurement Units.....................................................................................................38

What Is Being Measured?...........................................................................................38

Air Calibration .............................................................................................................39

Applications ................................................................................................................39

13. WARRANTY......................................................................40

14. RETURN OF ITEMS..........................................................40

Instruction Manual DO 6+

1. INTRODUCTION

Thank you for purchasing the DO 6+. This microprocessor-based handheld meter is economical and easy to use. It has a large custom LCD (Liquid Crystal Display) for clear and easy reading.

The DO 6+ offers measurement of dissolved oxygen (DO) as percentage saturation or concentration. 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.

Meter kits include a dissolved oxygen probe, refill solution, a rubber armour / stand, 4 alkaline “AAA” batteries, instruction manual, and warranty card. For

additional information, see Section 11 — REPLACEMENTS AND ACCESSORIES.

Please read this manual thoroughly before operating your meter.

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Instruction Manual DO 6+

2. GETTING STARTED

2.1 Description of Keypad Functions

Your meter has 6 keys on its splash-proof keypad. Some buttons have multiple functions depending on the mode of operation.

ON/OFF Powers meter on and off. Meter starts

CAL Enters into calibration mode. Pressing

MODE Selects desired measurement mode.

HOLD Freezes measured reading. Press again to resume live reading.

ENTER Confirms calibration value in calibration mode and confirm selections

up in the measurement mode that you last switched off from.

while in calibration mode will abort calibration without confirming value.

When pressed simultaneously with ON/OFF, it will take you into the SETUP mode.

For more information see Section 5 — SETUP.

in SETUP mode.

 Increment/decrement values during calibration mode or scroll through

SETUP menus. Set offset adjustments and configuration settings.

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Instruction Manual DO 6+

2.2 Description of LCD Annunciators

Your meter has a large custom LCD that consists of 4-digit segments plus annunciators for percentage saturation (%), concentration (mg/L or ppm) and Temperature in degrees Celsius (T).

Other annunciators include “A” (when the ATC function is activated), “CAL” (when meter is in calibration mode) and low battery condition.

Calibration Mode Annunciator

Low Battery annunciato

Temperature Mode

CAL

14-segment Liquid Crystal Display

Active LCD display for DO 6+

mg/l

ppm

A T C annunciator

milligram per litre (Concentration Mode)

parts per million

Percentage (Percentage Saturation Mode)

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Instruction Manual DO 6+

2.3 Inserting & removing the rubber armour / stand

1. To remove meter from rubber armour, push out from the bottom edges of meter until it is completely out of boot. Ensure that your electrode cables are not connected. See Figure 1.

2. To insert meter into armour, 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. See Figure 2.

Ing New Batteries

Figure 1 Figure 2

2.4 Inserting New Batteries

The battery compartment is found at the back of instrument. To open the battery compartment, push in the direction of arrow and lift up the cover. Note the polarity of battery before inserting into position. After replacement, place cover back and press down until it locks.

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Instruction Manual DO 6+

2.5 Battery Replacement

A low battery annunciator in the LCD alerts you when battery power is running

low. Caution: Power off the meter before replacing battery.

Low Battery Condition

2.6 Connecting the Electrode

1) To connect the electrode, align the connector slots with the posts of

meter’s socket and rotate connector clockwise until it locks.

2) To remove, rotate the connector in anti-clockwise direction until it

unlocks, and slide the connector off the socket.

3) Insert the mini phono jack of temperature sensor into the socket on the

meter as shown below.

2.5 mm mini phono

BNC connector

for temperature

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Instruction Manual DO 6+

2.7 Electrode Information

The DO 6+ includes a galvanic DO electrode (93X233912) which doesn’t require warm-up. It generates a millivolt signal proportional to the amount of oxygen in the solution.

The electrode has a dual cable; a BNC connector for DO measurement and a phono jack plug for temperature. The sensor utilizes a cathode, anode, and electrolyte that are separated from the sample by an oxygen permeable membrane. The membrane is pre-assembled for you and fixed to a detachable cap. The pre-assembled cap design allows simple replacement and fast conditioning.

The probe is light weight and includes a built-in temperature sensor. The epoxy body of the probe is 12mm diameter while the detachable Noryl cap is 16mm diameter. The compact sensing area

12 mm

reduces air entrapment resulting in quick, accurate, and stable readings.

The pre-assembled cap must be completely submersed to obtain an accurate reading in

Detachable Pre-membraned Cap (Probe Sensing Area)

solutions. Provide simple stirring for best results—ideally achieve a minimum water flow rate of 2 inch/second on the membrane. The probe is not recommended beyond 0 to 50 °C.

Shaking will aid to remove bubbles if needed

16 mm

before taking a reading. When calibrating in air, shake to remove water from the membrane.

The membrane is thin and can not be repaired if

Galvanic DO probe (93X233912)

damaged. Use care to protect from scratches, abrasion, or contact with solids. For best results keep membrane clean by rinsing after daily use.

See Section 6 – PROBE MAINTENANCE.

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Instruction Manual DO 6+

2.8 Switching the Meter On

OFF

CAL 13 CAL 24

Press ON/OFF to power up your meter. Your meter will cycle through various setup parameters when switched on.

1) All LCD segments will briefly illuminate.

2) The model [DO 6+] will display next along with mg/l,

ppm, and % annunciators.

3) Next, the meter revision number [r #.##] is shown

briefly before beginning measurement.

4) The meter begins with the measurement mode that

was in use when it was previously powered off⎯%, mg/l, ppm, or T.

TAvg

mg/l NTU ppm %pH

mg/l

ppm %

2.9 Changing Mode

Press MODE to switch between percentage saturation (%), concentration (mg/L)(ppm), and temperature (T) measurement.

MODE

mg/l

Automatic Temperature Compensation

Percentage Saturation

Concentration Mode

Temperature Mode

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Instruction Manual DO 6+

3. CALIBRATION

3.1 General Information

The DO 6+ has three measurement modes; DO as % saturation, DO as mg/L (or ppm) concentration, and temperature.

Dissolved oxygen levels vary with temperature, barometric pressure, and salinity, so calibration must be performed with consideration of these factors. It

is necessary to set the proper temperature, barometric pressure and salinity values prior to performing any DO calibration or measurement.

See Section 3.2 — Temperature Calibration See Section 5.2 — Automatic Temperature Compensation. See Section 5.9 — Pressure & Salinity Adjustment.

The DO 6+ will accept two % saturation calibration points; 100% using saturated air or air-saturated water, and 0% using zero oxygen solution. When 100% calibration is performed, the corresponding concentration is adjusted simultaneously. Therefore, it is not necessary to calibrate the concentration mode. If calibrating for 0% oxygen, note that the meter will take several minutes to reach 0% saturation value and constant stirring is not required.

The following table lists calibration values in % saturation calibration mode with two different barometric pressures. Note that the saturation value (92.1%) has decreased due to the lower barometric pressure entered.

% Saturation (per

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%

Calibration Value

(760mmHg)

Calibration Value

(700mmHg)

If calibration is attempted from 10.1% to 49.9%, the “Err.1” message is shown— calibration is rejected and the display will return to measurement mode.

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Instruction Manual DO 6+

The DO 6+ will accept one calibration point in concentration mode. The minimum value is 2 mg/L (ppm), and the calibration window is +/- 40% of the factory default value.

Temperature and % saturation calibration should take place before attempting to perform mg/L (ppm) concentration calibration.

Calibration of the concentration mode will only replace the previous concentration calibration and does not affect the % saturation calibration.

To offset your % saturation reading to match another instrument, see Section

5.8 — % Saturation Offset Adjustment.

New calibration values will automatically override the existing data. Perform daily calibration for best results. To completely recalibrate the meter and when installing a replacement electrode, it is best to clear all calibration data. See

Section 5.7Reset to Factory Default.

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