LaMotte pH 5 Plus Manuel utilisateur
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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.
PREFACE
This manual serves to explain the use of the pH 5 PLUS meter.
This manual functions in two ways: first 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.
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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 Powers meter on and off. Meter starts up in the mode that
was last used.
MODE/INC Increments values during temperature calibration mode.
CAL Allows calibration for pH or Temperature, or to abort
calibration and return to measure without confirming a
value.
HOLD Freezes the measured reading for easy viewing.
ENTER Confirms calibration value.
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2.2 Description of LCD Annunciators
The large custom LCD consists of 3½-digit segments which uses
annunciators for pH or °C (Temperature). Other annunciators include
“HO” (when HOLD function is activated) and “LO” (low battery
condition).
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. Figure 2.
Figure 1 Figure 2
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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 the cover in the direction of the arrow
and lift up. Note the polarity of the 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
The “LO” annunciator on the LCD alerts when battery power is running
low.
Caution: Power off the meter before changing battery.
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2.6 Connecting the Electrode and Temperature Sensor
To connect the probe to the meter, align the BNC connector slots with
the posts of the meter socket and rotate the connector clockwise until
it locks. Do not force the connector. To remove the probe, rotate the
connector in a counter-clockwise 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 measuring pH
without temperature compensation.
2.7 Conditioning the pH Electrode
For best results condition the pH probe before the first use, or if it has
not been used for a long time, by soaking it in pH 4 buffer solution for at
least 1 hour. Rinse before use.
2.5 mm mini phono
jack for
temperature sensor
BNC connector
pH probe
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2.8 Switching the Meter On
1. Press the ON/OFF key. All LCD segments will display
momentarily as the meter performs a self-diagnostic test. The
meter will display “- - -“ if the meter has not been calibrated or if
the meter has been reset.
2. Press the MODE key to choose the desired measurement mode.
3. If a temperature probe is not connected, either 25.0°C (factory
default) or the last calibrated temperature value will be
displayed. If a temperature probe is connected, the current
measured temperature will be displayed.
4. “Or” (Over range) indicates the reading exceeds the maximum
measurement range.
“Ur” (Under range) indicates the reading is under the minimum
measurement range (see Section 7 Specifications).
3. CALIBRATION
3.1 pH Calibration
The meter is capable of calibrating up to 3 pH values using USA or NIST
(nSt) pH buffer standards or 2 pH values with Low Ionic (Pb) pH buffer
standard. All new calibration values will automatically override existing
data.
USA group 4.01, 7.00, 10.01
NIST group 4.01, 6.86, 9.18
Pb group 4.10, 6.97
For the best results perform at least a 2-point calibration at room
temperature (25 °C) using standard buffers. Begin with pH 7.00 (USA
group), pH 6.86 (NIST group) or pH 6.97 (Pb group).
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