LaMotte PHPLUS DIRECT User manual

Instruction Manual

pHPLUS DIRECT

pH/mV/ISE Meter

Code 5-1936

PREFACE

This instruction manual serves to explain the use of the pHPLUS DIRECT

meter.

It 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

pHPLUS DIRECT meter as possible. If there are doubts in the use of this

meter, please do not hesitate to contact the LaMotte Tech Service

Department.

LaMotte 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.

Table of Contents

1. Introduction ............................. 5

2. Getting Started ........................... 6

2.1 Description of Keypad Functions ................... 6

2.2 Description of LCD Annunciations ................. 7

2.3 Inserting & Removing the Rubber Boot ............... 7

2.4 Inserting New Batteries ........................ 8

2.5 Battery Replacement ......................... 8

2.6 Connecting the Electrode and Temperature Sensor .........8

2.7 Condition the pH Electrode ..................... 9

2.8 Switching the Meter On ....................... 9

3. Calibration ............................. 10

3.1 pH Calibration............................ 10

3.2 Selection of pH buffer standards .................. 11

3.2.1 Resetting the User Calibrated Values ............... 11

3.2.2 pH Calibration using USA standard buffers ...........12

3.2.3 pH Calibration using NIST standaard buffers ...........13

3.2.4 pH Calibration using Pb Standard buffers ............14

3.3 Ion Calibration ........................... 15

3.3.1 Multi-point Ion Calibration ................... 16

3.4 Temperature Calibration ...................... 17

3.4.1 With Temperature probe .................... 17

3.4.2 Without Temperature probe (no ATC) .............18

4. Measurement ............................ 19

4.1 Taking Measurements ........................ 19

4.2 Millivolt (mV) Reference Check .................. 19

4.3 Holding a Reading .......................... 19

4.4 Releasing a Held Reading ...................... 19

5. Electrode Care and Maintenance .................20

6. Troubleshooting .......................... 20

7. Specifications ........................... 21

8. Accessories ............................. 22

9. Warranty Information ..................... 22-23

1. INTRODUCTION

Thank you for purchasing the pHPLUS DIRECT meter. 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 pHPLUS DIRECT measures pH, mV (ORP), temperature and ion

concentration of various ions (mono and di valence) with ion selective

electrodes (ISEs).

Included with your meter are a robust rubber boot, 4 alkaline “AAA” batteries,

buffer solutions, accessories, temperature sensor, instruction manual and a

warranty card. To order other accessories and buffer calibration or standard

solutions, please refer to Section 8 on Accessories for more information.

2. GETTING STARTED

2.1 Description of Keypad Functions

The pHPLUS DIRECT has six keys on its splash-proof keypad with tactile

feedback. The keys include ON/OFF,HOLD/ENTER,CAL,MODE,p

and qkeys.

Powers meter on and off. Meter starts up in the mode that you were in

before turning the meter off.

Selects measurement mode for Ion, mV, pH and Temperature.

Allows calibration for Ion, pH, mV or Temperature, or to abort

calibration without confirming any set value.

Allows you to increase values during calibration mode.

Allows you to decrease values during calibration mode.

Freezes the measured reading for easy viewing.

Confirms calibration value.

CAL

MODE

OFF

HOLD

ENTER

OFF

CAL

HOLD

ENTER

HOLD

ENTER

MODE

2.2 Description of LCD Annunciators

The meter has a large custom LCD that consists of 3½-digit segments and

operation annunciators for pH, mV or °C (Temperature). Note that there is no

annunciator shown in the Ion mode. Other annunciators include “HO” (when

the HOLD function is activated) and “LO” (low battery condition).

2.3 Inserting & Removing the Rubber Boot

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

the meter until it is completely out of the boot. Ensure that the cables of

the ISE/pH electrode or temperature probe are not connected

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

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

position. Lift up the stand on the back of the meter for bench top

applications if desired.

2.4 Inserting New Batteries

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

battery compartment, push in the direction of the arrow and lift up the cover.

Note the polarity of the batteries before inserting them into position. After

replacement, replace the cover and press down until it locks tight.

2.5 Battery Replacement

A“LO” annunciator in the LCD alerts you when battery power is running low.

Replace the batteries with the type recommended by the manufacturer.

Caution: Power off the meter when changing the batteries.

2.6 Connecting the Electrode and Temperature Sensor

To connect the electrode to the meter, align the connector slots with the posts

of the meter socket and rotate the connector clockwise until it locks. Do not

force it when connecting. To remove the electrode, simply rotate the

connector in a counterclockwise direction until it unlocks, and slide the

connector off the socket.

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

meter. Unplug the phono jack when not in use or when pH is being measured

without any temperature compensation.

2.7 Condition the pH Electrode

Condition the pH electrode before the first use or if it has not been in use for a

long time by soaking it in a container filled with pH 4 buffer solution for at

least 1 hour. Rinse with tap water before proceeding.

2.8 Switching the Meter On

1. Press the ON/OFF key to power up the meter. All LCD segments will be

displayed momentarily as the meter performs a self-diagnostic test, as

shown in section 2.2. The meter will be in the Ion measurements mode if

the meter has not been calibrated or reset. The display will show "---".

2. Press the MODE key to choose the desired mode of measurement, The

corresponding annunciator will be displayed on the LCD. In the

temperature mode, the display will show 25°C (factory default), the last

calibrated temperature if there is no temperature probe connected, or the

current measurement value if a temperature probe is connected.

3. The display will show “Ur” if the measurement is under the minimum

measurement or “Or”if the measurement is over the maximum

measurement range.

Phono jack of

Temperature probe

BNC of pH/ORP

Electrode or ISE

3. CALIBRATION

3.1 pH Calibration

The meter is capable of calibrating up to 3 points using USA or NIST (nSt)

pH buffer standards or 2 points with Low Ionic (Pb) pH buffer standards. All

new calibration values will automatically override existing data.

USA pH 4.01,7.00 and 10.01

NIST pH 4.01, 6.86 and 9.18

Pb pH 4.10 and 6.97

It is recommended that you perform at least a 2-point calibration at room

temperature (25 °C) using standard buffers, starting with the first buffer at pH

7.00 (USA), pH 6.86 (NIST) or pH 6.97 (Pb) followed by other buffer values.

For a 1-point calibration, the calibration should be performed with a pH buffer

value closest to the expected sample value being measured. Otherwise

calibrating at pH 7.00, pH 6.86 or pH 6.97 is advisable.

The meter has automatic buffer recognition that identifies the correct pH

buffer values during calibration. If non-standard pH buffers other than the

above standards are used, or the electrode has worn out, the LCD will flash

“Er1”. Press the CAL key to abort calibration and resume measurement. In

general all pH buffer values have the window of up to +/- 1 pH tolerance

during calibration.

Ensure that you use new pH buffer solutions during calibration. Do not reuse

buffer solutions as they may be contaminated and affect the calibration and

accuracy of measurements. Always store buffer solutions in a dry, cool

environment if possible.

Before use, remove the plastic protective cap on the pH electrode and

condition the glass bulb by soaking it in tap water for 1-2 hours. This hydrates

the glass bulb if the electrode is too dry or has not been used for a long period

of time. Always rinse the probes with tap water or rinse solution before and

after each calibration/sample measurement to avoid cross-contamination. For

details refer to section 5 on Electrode care and maintenance.

Table of contents

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