LLG pH meter 7 User manual

LLG-pH METER 7
Art.No. 6.263 600
Thank you very much for purchasing this LLG-pH METER 7.
Please read the following instructions carefully and always keep
this manual within easy reach.
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INSTRUCTION MANUAL
INSTRUCTION MANUAL UK

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1 Preface 2
2 Installation 3
3 Instruction 4
4 Measurement process 7
5 TechnicalSpecications 9
6 Self-diagnostic 10
7 Maintenance 12
8 Attention 13
WARRANTY REPLACEMENT 15
pH meter is a kind of wide used general
instrument in many different applications.
A typical pH meter consists of two parts: a
measuring probe and an electronic meter.
The measuring probe includes glass probe
and reference electrode, called pH electrode.
Today pH electrode normally has a built-
in temperature sensor, calls 3 in 1 pH
electrode.
1. Preface
Measuring principal:
E=E0-(2.3 RT/nF)*pH............................................................Nernst equation
E measured potential (mV)
E0 standard electrode’s potential (mV)
R the ideal gas constant (8.3144 J/K)
T the temperature in Kelvin (K)
nthe number of moles of electrons transferred in the cell reaction or half-
reaction (H+=1)
FFaraday’s constant (96485 C mol-1)

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Please instruction manual carefully before
using this instrument: read this
• Check the meter and the accessories
according to the enclosed packing list.
• Unpack the meter, connect it with the
power line in the box, plug the power line
to the local power supply. The display
screen should be lighted, press ‘ ’ key,
the meter is ready for use.
• If the user needed to transfer data to a
computer while measuring, please connect
a cable between the computer and the
RS232 socket of the meter before starting
measurement.
Note:
The meter could be switched on again
in 24 hours by touching any place on
the screen (3 seconds) if the meter
is switched off by pressing the red
“off” key on the screen. Unplug the
power and plug it again to switch the
meter on if the meter has not been
used for more than 24 hours. This is
for protecting the meter and energy
saving.
2. Installation
!
!
Fig. a is the assembly of parts
Fig. b shows the meter ready for use
Installation:
Put the electrode stand base under the
pH meter, mount the base and the meter
using the supplied screw. Press the button
on the electrode stand arm to install it.
Attention:
Keeping the supplied protective
cover on the device while operating
it may affect the functioning of the
touch display. For proper results, we
recommend to remove the protective
cover.
Fig. 1:
The illustration of
pH meter installation

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3. Instruction
The display of this instrument is 5” TFT
color LCD touch screen. The operator
can touch any icon on the screen except
the measurement reading to operate the
instrument. Fig. 2.
Fig. 2:
The illustration of the
main screen of the
pH meter
1. The main measurement screen and functional keys
1.1 Area A
System and measurement settings of the instrument
Key for date and time
adjustment. Screen lightness adjustment.
Switch off key. Press this key to switch off the instrument.
MTC Manual temperature compensation. For MTC temperature setting
End point selection. A- auto endpoint. M- manual endpoint.
Online data transfer. Press this icon, user can transfer measurement result to PC
or printer. For data transfer to PC, please follow the instruction in the software
package.
Electrode calibration reminder. Press this key to input the time, day, to remind the
user calibrate the electrode on time.

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1.2 Area B
Measurement Result Display
Measurement result unit., press it to make an alternate display.
A M Endpoint. A-automatic, M-manual.
Temperature in Celsius degree.
1.3 Area C
Database
Press this icon for data in database transfer.
Press this icon for review data in database.
1.4 Area D
The electrode status and the buffer solution
The electrode status. 5 … 3 star is the minimum requirement for good
measurement. Press it to review the electrode calibration data.
4.01,7.00,9.21
The buffer solutions selected for the electrode calibration. Press it to view
the electrode calibration data.

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1.5 Area E
Operation keys
Press it to start a measurement or make a conrmation.
Press to end a measurement process manually.
Press to save current reading.
The current datum has been saved.
Press to start the calibration process.
1.6 Area F
Navigation bar
The date and time set by the operator.
PC or Printer. The operator selected.
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Press this logo, the user can view the information of this meter, such as
S/N, software version, restore the factory settings and the instruction
menu.
Restore factory settings: all the settings will be replaced by the default
settings.
Item Default setting Item Default setting
MTC 25.0 °C Database remain
Endpoint mode auto Electrode calibration
curve 100 %
Data transfer Off Buffer solutions Europe standard
Calibration Reminder None Screen brightness Medium

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4. Measurement process
It’s recommended to perform an electrode
calibration before measuring a sample. If
the electrode is calibrated in short time,
the sample measurement can be conducted
directly.
If the electrode without temperature
compensation is used, “MTC” will be
displayed on the main screen, press „ ”
on the main screen, user can set up the
calibration buffer solution temperature.
If a 3-in-1 electrode is being used, or a
temperature electrode is used at the same
time, “ATC” will be displayed on the main
screen and the calibration buffer solution
temperature will be measured automatically.
Press the „ ” on the main screen, select
one of the standard buffer solutions groups
built-in. The selected standard buffer
solution group must match the buffer
solution group actually used.
Press „ “ on the main screen, the
calibration window pop-up, Fig. 3, put the
electrode in the rst buffer solution,
press „ “to start the calibration.
When the endpoint reached, take the
electrode out and wash it with DI water, dry
it, put it in the second buffer solution for
second point calibration, same procedure for
the third point calibration.
The calibration data will be stored in the
database after press the return key.
This icon means the calibration result
meets requirement
Means the result is not under satisfaction.
Notice:
• During the calibration process, if the red
wave line is shining, means the calibration
is going on, if press” return ” at this time,
the calibration process will stop and go
back to the main screen.
• Calibration buffer solutions selection:
normally, the pH values of the selected
calibration buffer solutions are similar
to the pH of the sample solutions to be
tested.
1. Calibration

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Fig. 3:
The illustration
of the electrode
calibration
Wash the electrode with DI water, dry it, put
it in the sample solution, stir the solution
with electrode slightly.
Press key on the screen starting the
measurement. Press on the screen after
the endpoint reached, saving measurement
result to database. Fig. 4.
2. Measurement
Fig. 4:
The illustration of
measurement

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5.TechnicalSpecications
Model
Parameter
ph-Meter 7
Measurement mode pH/mV
pH range (pH) -2.00 to 20.00
Resolution (pH) 0.01
Accuracy (pH) ± 0.01
mV range (mV) -2000 to 2000
Resolution (mV) 1
Accuracy (mV) ± 1
Temperature range (°C) MTC: -5.0 to 105.0 °C
ATC: -5.0 to 105.0 °C
Temperature Accuracy (°C) ± 0,5 °C
Calibration 3 predened pH buffer groups, automatic buffer
recognition
Database 500 groups measuring data
Data output RS232, Printer (optional),
IS-Link
Display 5.0˝ color, touch screen,
Resolution 480*720
Power 9V DC/1A
pH Input BNC, Impedance>10 e+12 Ω
Temperature input NTC 30 KΩ
Order No. 6.263 600
Conguration IS126 Meter,YE203 electrode, Electrode stand, Protective
cover

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6. Self-diagnostic
During the instrument operation process,
some signs might appear on the main
screen, this is the information of the
instrument self-diagnostic, which will help
you to nd out some problems of the
instrument or the electrode you are using.
1. Electrode Status:
offset
slope
< 15 mV 15 mV ≤ offset ≤
35 mV > 35 mV
95%≤slope≤105%
90%≤slope≤95%
85%≤slope≤90%
slope>105%
slope<85%

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Error message Possible reasons
Buffer solutions temperature has
a big difference from the pointed
temperature.
The temperature difference between the measured buffer
solution and the dened buffer solution is bigger than
±0.5 °C.
Buffer solution temperature is out
of range
Standard calibration buffer solution group: the
temperature of the measured buffer solution or the MTC
temperature not in the temperature 0.0 – 60.0 °C range.
The offset of the electrode is out of
range
1. The buffer solution in use is not matched with the
selected buffer solution group.
2. The buffer solution is not in good condition.
3. The electrode used is not in good condition or has
been damaged.
Wrong buffer solution 1. The same buffer solution used for second or third point
for calibration.
2. The electrode used is not in good condition or been
damaged.
The calibration Slope of the
electrode is out of limit
1. The buffer solution used is not matched with the
selected buffer solution
2. Buffer solution is not in good condition
3. The electrode used is not in good condition or been
damaged.
If the icon comes out follow the
calibration point, the possible reasons are
below:
2. Calibration Error messages:

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7. Maintenance
The pH probes used in modern laboratories are combination electrodes. The advantages
of these kinds of electrodes are: easy to be used, avoiding the effects of the oxidizing
or reducing substances to the electrodes, quick balancing in solution. Below are brief
introductions of the electrode and its maintenance.
1. If the electrode is not in good condition: failure or performance degradation, the operator
can’t get an accurate measurement results or even can’t perform the measurement.
2. The electrode bulb must be immersed in the 3 mol/L KCl solution for 24 hours for the rst
time use (if there is no solution in the protective sleeve) or the electrode is not used for
quite a long time.
3. Cover the electrode bulb with the protective sleeve which contained KCl solution after
each time used. The reference internal KCl solution, inside the electrode tube, must reach
the half level. Pull the plug on the top of the electrode out when take a measurement. Put
it back when nished the measurement.
4. The electrode should not be immersed in the DI water, protein solution or acidic uoride
solution for a long time. The electrode should be avoided contacting with the organic
silicone oil.
5. Immerse the combine electrode bulb in 3 mol/L KCl solution after use. Do not use any
detergents or other water-absorbing agents to wash the electrode.
6. Inspect the glass bulb before using the electrode. The bulb should be transparent, no
cracks, no air bubbles inside and full of solution.
7. Shorten the measuring time when take a pH of a high concentration solution, wash the
electrode carefully after using it. Avoid the adhesion and condemnation of the electrode.
8. After wash the electrode, do not wipe the glass bulb but use a lter paper to dry it. This
will avoid the damage of the glass membrane, cross condemnation which may affect the
measurement accuracy.
9. The electrodes cannot be used to measure the pH of strong acids, strong bases and other
corrosive solutions.
10. The electrode is prohibited to use in dehydration solutions such as anhydrous ethanol,
potassium dichromate solutions.
11. The electrode bulb is very thin glass lm, avoid touch it with other hard object.
12. Do not immerse the combination electrode in DI water for long time. Put the electrode
bulb in the bottle which lled with protective solution, in order to make the electrode
remain active. Protective solution: one packet of pH 4.00 buffer solution (250 ml), plus
250 ml DI water, plus 56 g KCl (analytical reagent), stir it till the KCl solid dissolved.
13. Choose the appropriate pH probe to measure the matched samples, e.g. measuring
strong acid, strong base or DI water.

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14. Do not use hand or metal object to touch the center of the electrode socket on the
instrument. Put the short circuit plug or the electrode plug on when the instrument not in
use. This will avoid the dust or moisture to affect the instrument and have affection of the
accuracy of the measurement.
15. The instrument shell is made of ABS. Organic solvent is not recommended for the shell
cleaning.
16. To get a more accurate result, the pH value of the measured sample should be in range of
the calibration buffer solutions’pH values, the temperatures of the sample should be the
same as the calibration buffer solution
17. Do not use the expired standard buffer solution, do not put the used standard buffer
solution back to the storage bottle. If the standard buffered solution is turbidity, moldy or
precipitation, discard it.
18. Keep the pH buffered solution in the refrigerator after usage. For the base buffered
solution, the storage time is shorter because the CO2in the air is easy to be absorbed by
it and cause the change of the pH value.
19. Keep the instrument away from the direct sunlight, which might shorten the lifetime of
the LED screen.
8. Attention
1. 1.The samples, the electrode performance and the requirement of measurement
accuracy, these factors will determine how frequent to calibrate the instrument. Higher
accuracy (pH≤±0.02) needs more accurate standard buffered solution and calibrates the
instrument frequently. For accuracy (pH≥±0.1), one time calibration can last one week or
even longer time for measurement process.
2. Re-calibration is needed under these conditions:
a) A new electrode or a long term unused electrode is used to measure a sample;
b) After measuring strong acid solution (pH<1) or a strong base solution (pH>12);
c) After measuring a solution containing uoride or concentrated organic solution;
d) There is a big difference between the temperature of the sample and the calibration
buffer solution.
3. Press MTC on the main screen to compensate the temperature manually if the
temperature electrode is not in used.
4. Preparation of the electrode protective solution: dissolve 25 g KCl (A.R) in 100 ml DI
water. The electrode should not be immersed in DI water, protein solution or acidic
uoride solution for a long time.

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5. For higher measurement accuracy, the instruments should be calibrated by a standard
buffer solution. The used standard buffer solution should be discarded after several times
used.
6. Keep the instrument clean and dry, especially the socket of the electrode in the meter.
Use the cotton and anhydrous ethanol to clean these sockets and dry them.
7. Wash the electrode bulb with DI water before and after the measurements. Dry it with
lter paper,
8. (a) The glass bulb condemnation or aging: immerse the electrode in 0.1 mol/L HCl
solution (9 ml concentrated HCL solution is diluted with DI water to 1000 ml) for 24
hours, wash it with DI water. Then immerse it in the 3 mol/L KCl solution for another
24 hours to active it. Or immerse the glass bulb in 4 % HF solution for 3 – 5 seconds,
wash it with DI water, then immerse the glass bulb in 3 mol/L KCl solution for 24
hours to active it.
(b) Cleaning of the glass bulb and pollution: (for reference)
condemnation Cleaner
Inorganic metal oxide diluted acid (<1 mol/L)
Organic grease Diluted detergent (weak alkaline)
Polymer resin Diluted alcohol, acetone, ethyl ether
Protein cell sediment Acid enzyme solution (yeast tablets)
Pigment substance Diluted bleach, peroxide
9. One year is the lifetime of an electrode usage. The lifetime will be shorter if the electrode
is used in the harsh conditions or maintenance improperly. The aged or failed electrode
should be replaced with new one for good measurement result.
10. Unplug the power supply after the meter is switched off. Don’t unplug the power supply
code when the meter is on.

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WARRANTY REPLACEMENT
This product is warranted to be free from defects in material and workmanship for a period of
three (3) years from date of purchase.
This warranty is valid only if the product is used for its intended purpose and within the
guidelines specied in this instruction manual. This warranty does not cover damage caused
by accident, neglect, misuse, improper service, natural forces or other causes not arising
from defects in original material or workmanship. This warranty does not cover any incidental
or consequential damages, commercial loss or any other damagesfrom the use of this
product.
The warranty does not cover damage to paint or nish and defects or damages caused by
physical and chemical abuse or normal wear and tear. The warranty is invalidated by any non-
factory modication, which will immediately terminate all liabilities on us for the products or
damages caused by its use. The buyer and its customer shall be responsible for the product
or use of products as well as any supervision required for safety. If requested the products
must be returned to the distributor in well packed and insured manner and all shipping
charges must be paid.
Information on the disposal of electrical and electronic devices in the European Community:
The disposal of electrical devices is regulated within the European Community by national
regulations based on the European Directive 2012/19/EU on waste electrical and electronic
equipment (WEEE). According to these regulations, any devices supplied after 13.06.05 in the
business to business sphere, to which this product is assigned, may no longer be disposed of
in municipal or domestic waste. They are marked with the following symbol to indicate this.
As disposal regulations within the EU may vary from country to country, please contact your
supplier if necessary.
PRODUCT DISPOSAL
In case the product is to be disposed of, the relevant legal regulations are to be followed.

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