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.
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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. . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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3.2 Selection of pH buffer standards . . . . . . . . . . . . . . . . . . |
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3.2.1 Resetting the User Calibrated Values . . . . . . . . . . . . . . . |
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3.2.2 pH Calibration using USA standard buffers . . . . . . . . . . . |
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3.2.3 pH Calibration using NIST standaard buffers . . . . . . . . . . . |
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3.2.4 pH Calibration using Pb Standard buffers . . . . . . . . . . . . |
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3.3 Ion Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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3.3.1 Multi-point Ion Calibration . . . . . . . . . . . . . . . . . . . |
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3.4 Temperature Calibration . . . . . . . . . . . . . . . . . . . . . . |
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3.4.1 With Temperature probe . . . . . . . . . . . . . . . . . . . . |
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3.4.2 Without Temperature probe (no ATC) . . . . . . . . . . . . . |
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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
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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.
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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, and keys.
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Powers meter on and off. Meter starts up in the mode that you were in |
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before turning the meter off. |
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OFF |
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MODE |
Selects measurement mode for Ion, mV, pH and Temperature. |
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CAL |
Allows calibration for Ion, pH, mV or Temperature, or to abort |
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calibration without confirming any set value. |
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Allows you to increase values during calibration mode. |
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Allows you to decrease values during calibration mode. |
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HOLD |
Freezes the measured reading for easy viewing. |
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ENTER |
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HOLD |
Confirms calibration value. |
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ENTER |
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ON |
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OFF |
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CAL |
HOLD |
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ENTER |
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MODE
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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.
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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.
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