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: Þ 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: Reagents marked with an * are considered to be potential
health hazards. To view or print a Safety Data Sheet (SDS) for these
reagents go to www.lamotte.com. Search for the four digit reagent code
number listed on the reagent label, in the contents list or in the test
procedures. Omit any letter that follows or precedes the four digit code
number.
.
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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 Bu er 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.
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 o . 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 conÞ rming a
value.
HOLD Freezes the measured reading for easy viewing.
ENTER ConÞ rms 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.
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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 o 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 o 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 Þ rst use, or if it has
not been used for a long time, by soaking it in pH 4 bu er 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 SpeciÞ cations).
3. CALIBRATION
3.1 pH Calibration
The meter is capable of calibrating up to 3 pH values using USA or NIST
(nSt) pH bu er standards or 2 pH values with Low Ionic (Pb) pH bu er
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 bu ers. Begin with pH 7.00 (USA
group), pH 6.86 (NIST group) or pH 6.97 (Pb group).
For a 1-point calibration, the calibration should be performed with a pH
bu er value closest to the expected sample value being measured.
The meter has automatic bu er recognition that identiÞ es the correct pH
bu er values during the calibration. The meter will accept calibration
values that are within ±1.0 pH units of the expected value, otherwise
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the DISPLAY will ß ash Er1 and the value will not be accepted. Press
CAL to abort the calibration and return to the measurement mode.
Always use new pH bu er solutions for calibration. Do not reuse
bu er solutions that may be contaminated and a ect the calibration
and accuracy of the measurements. Promptly seal containers and store
solutions in a dark, dry, cool environment.
Before use, remove the plastic protective cap on the pH probe and
condition the glass bulb by soaking it in tap water or pH bu er
(preferably pH 4) for 1-2 hours. This will hydrate the glass bulb if the
probe is too dry or if it has not been used recently. Always rinse the
probe with clean water before and after each calibration or sample
measurement to avoid cross-contamination. For details refer to Section 5
on Probe Care and Maintenance.
3.1.1 pH Calibration Procedure Single Point
1. Pour a known pH bu er calibration standard solution, e.g. pH
7.00, into a clean, dry container. Turn on the meter and select the
pH mode by pressing the MODE key.
2. Dip the pH probe and temperature probe into the solution. Stir
gently and wait for the reading to stabilize (approximately 30
seconds depending on the probe condition).
3. Press CAL to enter the pH calibration mode. CA will be
displayed momentarily before the display will ß ash the current
un-calibrated reading.
To abort or cancel the calibration without accepting the new
value, press the CAL key. The meter will automatically revert to
the pH measurement mode.
4. Allow the reading to stabilize. Press the ENTER key to conÞ rm
the calibration. CO will be displayed momentarily.
5. Press the CAL key to return to the measurement mode.
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