LaMotte pH Meter User Manual

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PREFACE

This manual serves to explain the use of the pH 5 PLUS meter.
This manual functions in two ways: fi 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 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.

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TABLE OF CONTENTS

1. INTRODUCTION 5

2. GETTING STARTED 6

2.1 Description of Keypad Functions 7

2.2 Description of LCD Annunciators 7

2.3 Inserting & Removing the Rubber Boot/Stand 8

2.4 Inserting New Batteries 8

2.5 Battery Replacement 8

2.6 Connecting the Electrode and Temperature Sensor 9

2.7 Conditioning the pH Electrode 9

2.8 Switching the Meter On 10

3. CALIBRATION 10

3.1 pH Calibration 10

3.1.1 pH Calibration Procedure 11

3.1.2 Changing the pH Buffer Group 12

3.1.3 Resetting User Calibrated Values 13

3.2 Temperature Calibration 13

3.2.1 With Temperature Probe 13

3.2.2 Without Temperature Probe (no ATC) 14

4. MEASUREMENT 15

4.1 Taking Measurements 15

4.2 Holding a Reading 15

4.3 Releasing a Held Reading 15

5. ELECTRODE CARE AND MAINTENANCE 16

6. TROUBLESHOOTING 16

7. SPECIFICATIONS 17

8. REPLACEMENT PARTS AND ACCESSORIES 18

9. WARRANTY 18

10. RETURN OF ITEMS 19

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1. INTRODUCTION

The pH 5 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 pH 5 PLUS measures pH and temperature (°C).

Meters include 4 alkaline “AAA” batteries, a rubber boot /stand,
instruction manual, and warranty card. Please refer to Section 8
Replacement Parts and Accessories for information on additional
accessories and calibration solutions.

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2. GETTING STARTED

2.1 Description of Keypad Functions

The pH 5 PLUS has four keys on the splash-proof keypad: ON/OFF,
HOLD/ENTER, CAL and MODE/INC.

ON/OFF

MODE/INC

CAL

HOLD

ENTER

Powers meter on and off. Meter starts up in the mode that
was last used.

Increments values during temperature calibration mode.

Allows calibration for pH or Temperature, or to abort
calibration and return to measure without confi rming a
value.

Freezes the measured reading for easy viewing.
Confi rms calibration value.

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