LaMotte DO 6 PLUS User manual

Code 5-0107-01

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

PREFACE

This manual serves to explain the use of the DO 6 PLUS hand held

meter.

This manual functions in two ways: f rst as a step by step guide to

operating the meter; second, as a handy reference guide.

This manual is written to cover as many anticipated applications of the

DO 6 PLUS meter as possible. If there are questions about the use of this

meter contact the LaMotte Tech Service Department.

LaMotte Company 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 LaMotte Company.

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.

TABLE OF CONTENTS

1. INTRODUCTION 5

2. GETTING STARTED 6

2.1 Description of Keypad Functions 6

2.2 Description of LCD Annunciators 7

2.3 Inserting & removing the Rubber Boot/Stand 7

2.4 Inserting New Batteries 8

2.5 Battery Replacement 8

2.6 Connecting the Probe 9

2.7 Electrode Information 10

2.8 Switching the Meter On 11

2.9 Changing Mode 11

3. CALIBRATION 12

3.1 General Information 12

3.2 Temperature Calibration 13

3.3 % Saturation Calibration 14

3.3.1 100% Calibration 14

3.3.2 0% Calibration 15

3.4 mg/L or ppm Calibration 16

4. MEASUREMENT 17

4.1 Temperature Compensation 17

4.2 Taking Measurements 18

4.3 Pressure & Salinity Compensated Measurements 18

4.4 Holding a Reading 19

5. SETUP 19

5.1 Conf guration Menu (COF.1) 23

5.2 Automatic Temperature Compensation (A.ATC) 23

5.3 Selection of mg/L or ppm (b.DO) 24

5.4 Calibration Data (CAL.2) 24

5.5 Electrode Data (ELE.3) 25

5.6 Automatic Shut Off (AtO.4) 26

5.7 Reset to Factory Default (rSt.5) 26

5.8 % Saturation Offset Adjustment (OFS.6) 27

5.9 Pressure & Salinity Adjustment 29

6. PROBE MAINTENANCE 30

6.1 Cap and Electrolyte Replacement 31

6.2 Electrolyte Solution 32

7. TROUBLESHOOTING 32

8. ERROR MESSAGES 33

9. FACTORY DEFAULT SETTINGS 34

10. SPECIFICATIONS 35

11. REPLACEMENT PARTS AND ACCESSORIES 36

12. DISSOLVED OXYGEN THEORY 37

Measurement Units 37

What Is Being Measured? 37

Air Calibration 38

Applications 38

13. WARRANTY 39

14. REPAIRS 40

1. INTRODUCTION

The DO 6 PLUS 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 PLUS offers measurement of dissolved oxygen (DO) as

percentage saturation or concentration. Temperature measurement is

available in degrees Celsius. The meter ensures accurate measurement

of the dissolved oxygen values through the temperature, barometric

pressure and salinity compensation features.

Meter kits include a dissolved oxygen probe, ref ll solution, a rubber

boot/stand, 4 alkaline “AAA” batteries and instruction manual. For

additional information, see Section 11 — Replacement Parts and

Accessories.

Read this manual thoroughly before operating the meter.

2. GETTING STARTED

2.1 Description of Keypad Functions

The meter has 6 keys on a splash-proof keypad. Some buttons have

multiple functions depending on the mode of operation.

ON/OFF Powers meter on and off. Meter starts up in the

measurement mode that was last used.

CAL Enters into calibration mode. Pressing while in calibration

mode will abort calibration without conf rming value.

MODE Selects desired measurement mode. When pressed

simultaneously with ON/OFF, it will go to the SETUP

mode.

HOLD Freezes measured reading. Press again to resume live

reading.

ENTER Conf rms calibration value in calibration mode and

conf rm selections in SETUP mode.

Increments/decrements values during calibration mode or

scroll through SETUP menus. Set offset adjustments and

conf guration settings.

2.2 Description of LCD Annunciators

The 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.

milligram per litre

(Concentration Mode)

mg/l

ppm

14-segment Liquid Crystal Display

Low Battery annunciator

Calibration Mode

Annunciator

CAL

Temperature Mode

A T C annunciator

parts per million

Percentage

(Percentage Saturation

Mode)

2.3 Inserting & Removing the Rubber Boot/Stand

1. To remove the meter from the rubber boot, push out the bottom

edge of the meter until it is completely out of the boot. Ensure

that the probe cables are not connected. See Figure 1.

2. To insert the meter into the rubber boot, slide in the top of the

meter before pushing the bottom edge of the meter down to set it

into position. Lift up the stand at the back of the meter for bench

top applications. See Figure 2.

Figure 1 Figure 2

2.4 Inserting New Batteries

The battery compartment is found at the back of the instrument. To open

the battery compartment, push the cover in the direction of the arrow and

lift up. Note the polarity of batteries before inserting them into position.

After the batteries have been replaced, reposition the cover and press

down until it locks.

2.5 Battery Replacement

A low battery annunciator on the LCD alerts when the battery power is

running low. Caution: Power off the meter before replacing the batteries.

Low Battery Condition

2.6 Connecting the Probe

1. To connect the probe, align the connector slots with the posts of

the meter socket and rotate the connector clockwise until it locks.

2. To remove the probe, rotate the connector in an anti-clockwise

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

3. Insert the mini phono jack of the temperature sensor into the

socket on the meter as shown below.

2.5 mm mini phono

jack for

temperature sensor

BNC connector

for DO probe

2.7 Electrode Information

The DO 6 PLUS includes a galvanic DO electrode

which does not require warm-up. It generates

a millivolt signal proportional to the amount of

oxygen in the solution.

The probe 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 and f xed to a

detachable cap. The pre-assembled cap design

allows simple replacement and fast conditioning.

The probe is lightweight and includes a built-in

temperature sensor. The epoxy body of the probe

is 12mm in diameter while the detachable Noryl

cap is 16mm in diameter. The compact sensing

area reduces air entrapment resulting in quick,

accurate, and stable readings.

The pre-assembled cap must be completely

submersed in the solution to obtain an accurate

reading. Provide simple stirring for best results—

ideally achieve a minimum water f ow rate of 2 inch/second on the

membrane. The probe is not recommended for use in samples outside of

the range of 0 to 50 °C.

Shaking the probe will aid in removing bubbles, if needed, 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 it is damaged. Use care

to protect from scratches, abrasions, or contact with solids. For best

results keep the membrane clean by rinsing it after daily use. See Section

6 – Probe Maintenance.

Detachable

Pre-membraned Cap

(Probe Sensing Area)

16 mm

12 mm

Table of contents

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