LaMotte pHPLUS DIRECT 2 Manuale utente
Code 5-1936-01
PREFACE
This manual serves to explain the use of the pHPLUS DIRECT 2 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.
*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. For example, if the code is 4450WT-H, search 4450. To obtain a
printed copy, contact LaMotte by email, phone or fax.
Emergency information for all LaMotte reagents is available from Chem-
Tel: (US, 1-800-255-3924) (International, call collect, 813-248-0585).
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.
TABLE OF CONTENTS
1. INTRODUCTION 5
2. GETTING STARTED 6
2.1 Description of Keypad Functions 6
2.2 Description of LCD Annunciators 7
2.3 Inserting & Removing the Rubber Boot/Stand 7
2.4 Inserting New Batteries 8
2.5 Battery Replacement 8
2.6 Connecting the Probe and Temperature Sensor 9
2.7 Conditioning the pH Probe 9
2.8 Switching the Meter On 9
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 12
3.2 Ion Calibration 13
3.2.1 Ion Calibration Procedure 13
3.3 Temperature Calibration 15
3.3.1 With Temperature Probe 15
3.3.2 Without Temperature Probe (no ATC) 16
4. MEASUREMENT 17
4.1 Taking Measurements 17
4.2 Millivolt (mV) Reference Check 17
4.3 Holding a Reading 17
4.4 Releasing a Held Reading 18
5. ELECTRODE CARE AND MAINTENANCE 18
6. TROUBLESHOOTING 19
7. SPECIFICATIONS 20
8. REPLACEMENT PARTS AND ACCESSORIES 21
9. WARRANTY 22
10. REPAIRS 22
5
1. INTRODUCTION
The pHPLUS DIRECT 2 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 meter measures pH, mV (ORP), temperature and allows direct ion
concentration measurement of various ions (mono and divalent). The mV
mode is also useful for diagnosing problems with ion selective electrodes
(ISE).
The meter includes 4 alkaline “AAA” batteries, a rubber boot/stand, and
instruction manual. Please refer to Section 8 Replacement Parts and
Accessories for information on additional accessories and calibration
solutions.
6
2. GETTING STARTED
2.1 Description of Keypad Functions
The pHPLUS DIRECT 2 has six keys on the splash-proof keypad: ON/
OFF, HOLD/ENTER, CAL, MODE, or .
ON/OFF Powers meter on and off. Meter starts up in the mode that
was last used.
CAL Allows calibration for Ion, pH, mV or Temperature, or to
abort calibration and return to measure without confirming
a value.
MODE Selects measurement mode for Ion, mV, pH and
Temperature.
HOLD Freezes the measured reading for easy viewing.
ENTER Confirms calibration value.
Increments values during calibration mode.
Decrements values during calibration mode.
7
2.2 Description of LCD Annunciators
The large custom LCD consists of 3½-digit segments which uses
annunciators for pH, mV or oC (Temperature). No annunciator is shown
in Ion mode. 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
8
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 offthe meter before changing battery.
9
2.6 Connecting the Probe 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 offthe 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 Probe
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.
2.8 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.
If a temperature probe is not connected, either 25.0°C (factory
2.5 mm mini phono
jack for
temperature sensor
BNC connector
for pH/ORP probe
or Ion Selective
Electrode
10
default) or the last calibrated temperature value will be
displayed. If a temperature probe is connected, the current
measured temperature will be displayed.
3. “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).
For a 1-point calibration, the calibration should be performed with a pH
buffer value closest to the expected sample value being measured.
The meter has automatic buffer recognition that identifies the correct pH
buffer values during the calibration. The meter will accept calibration
values that are within +/-1.0 pH units of the expected value, otherwise
the DISPLAY will flash “Er1” and the value will not be accepted. Press
CAL to abort the calibration and return to the measurement mode.
Always use new pH buffer solutions for calibration. Do not reuse
buffer solutions that may be contaminated and affect the calibration
and accuracy of the measurements. Promptly seal containers and store
solutions in a dark, dry, cool environment.
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1
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