Yoke P613 PH User manual

Shanghai Yoke Instrument Co.,Ltd.
Model P613 PH /Conductivity Meter
Operation Manual
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Table of Contents
1. Brief Introduction -----------------------------------------------------------------------------------1
2. Technical Parameters ------------------------------------------------------------------------------ 2
3. Instructions to the Meter ---------------------------------------------------------------------------3
3.1. LCD Display --------------------------------------------------------------------------------------3
3.2. Operation Keys -----------------------------------------------------------------------------------4
3.3. The Storage, Recall and Elimination of the Measuring Information ----------------------5
4. P/H Measurement ----------------------------------------------------------------------------------6
4.1. Preparation Work ------------------------------------------------------------------------------ --6
4.2. Meter Calibration --------------------------------------------------------------------------------6
4.3. PH solution Test ----------------------------------------------------------------------------------8
4.4. Parameter Setting ---------------------------------------------------------------------------------8
4.5. Considerations------------------------------------------------------------------------------------14
4.6The Self-diagnose Information------------------------------------------------------------------14
5. MV Measurement ---------------------------------------------------------------------------------14
6. Conductivity Measurement ----------------------------------------------------------------------14
6.1. Preparation Work ------------------------------------------------------------------------------- 15
6.2. Meter Calibration ------------------------------------------------------------------------------- 15
6.3. Conductivity Test --------------------------------------------------------------------------------16
6.4. Important Statement ---------------------------------------------------------------------------- 16
6.5. Parameter Setting ------------------------------------------------------------------------------- 18
6.6. Considerations ----------------------------------------------------------------------------------- 22
7. Meter’s Complete Kit ----------------------------------------------------------------------------- 23
8. Warranty ---------------------------------------------------------------------------------------------24

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1. Brief Instruction:
Thanks for buying and using the model P613 pH / mV / Conductivity Meter (the
following called “meter”in short).
Before using this meter, please read the operation manual carefully in order to help use
and maintain it correctly. On the basis of improving instrument of performance constantly,
we reserve the right of changing the content of this manual and accessories in case of not
notifying in advance.
This meter is a perfect combination with the most advanced electronic technology, sensor
technology and software design. The meter can measure the parameters of pH and
conductivity for high accuracy water solution. It is the best portable conductivity meter
with the highest performance and the lowest cost. It is suitable for the trade such as the
mining industry, power plant, water treatment projects and environmental protection, etc.,
especially has more extensive application in the field and spot test.
Built-in microprocessor chip, beautiful appearance, multi-functional and easy to use, this
meter has the following prominent features:
1.1.Built-in microprocessor chip, with the intelligent functions of automatic calibration,
automatic/manual temperature compensation, data storage, function setting and
automatic power off and low voltage display etc. Equips with calibration solution and
special carrying case, easy to use.
1.2.Adopts digital filter and step slipping technology to intelligently improve meter’s
response speed and result accuracy. “ ” will appear when reading to be stable.
1.3.A new type of acidity meter electrode and conductance electrode,it can be measured
pH,mV,COND,RES,TDS,SAL,it is more convenient to use, more accurate to measure.

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1.4.Automatic identification of PH buffer solution and conductivity calibration solution,
user can choose anyone from three series of buffer solutions: Europe & U.S.A. series,
NIST series, and China series,can be a point, two and three points to calibrate the way
to facilitate customer selection.
1.5. Meter’s circuit board adopts SMT film-covering technology to improve meter’s
production reliability.
1.6. Meter has the back light LCD display monitor.
1.7. IP54 dust and water resistant.
2. Technical Parameters:
2.1. pH:
Measuring range
(-2.00 - 19.99) pH
(Depending on type of electrode used)
Resolution
0.1/0.01 pH
Accuracy
Meter:±0.01pH; Complete Kit: ±0.02pH
Input current
≤2×10-12 A
Input impendance
≥1×1012 Ω
Stability
±0.01 pH/3h
Temp. Compensation range
(0 - 100) ℃(auto/manual)
2.2. mV:
Measuring range (mV/ORP/EH)
-1999 mV - 0 - 1999mV
Resolution
1mV
Accuracy
Meter:±0.1% FS

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2.3. Conductivity：
Measuring range
Conductivity:
(0.00 - 19.99)μS/cm (20.0 - 199.9)μS/cm
(200 - 1999)μS/cm (2.00 - 19.99) mS/cm
(20.0 - 199.9) mS/cm
TDS: (0 - 100) g/L
Salinity : (0 - 100) ppt
Resistivity: (0 - 100) MΩ·cm
Resolution
0.01/0.1/1μS/cm 0.01/0.1 mS/cm
Accuracy
Meter:±1.0% FS, connect meter with electrode:±1.5% FS
Temp. compensation range
(0 - 100) ℃(manual / auto)
Electrode constant
0.1 / 1 / 10 cm-1
Benchmark temperature
25℃, 20℃and 18℃
2.4. Other Technical Parameters:
Data storage
150 groups
Storage content
Series number, measuring value, measuring unit
and temperature,
Power
Two AA batteries (1.5V x2)
Size and weight
Meter: (165×90×32)mm/310g
Quality and safety certification
ISO9001:2000, CE and CMC
2.5. Working Condition:
Environment temperature
5 - 35 ℃(0.01 grade)
Environmental humidity
≤85%
IP rating
IP54 dust and water resistant.

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3. Instructions to the Meter:
3.1. LCD Display:
① —— Parameters mode icon
② —— Measuring value
③ — — Serial number and icon as measuring value to be stored and recalled, and
indication icon for special state.
M+ —measuring value to be stored icon; RM —reading to be recalled icon;
④ —— Measuring unit
⑤ —— Temperature measuring value and unit
⑥ —— Measuring value to be stable icon
⑦ —— Electrode calibration indicate icon
⑧ — — Indication icon of low voltage, appears when the voltage less than 2.4V, call
attention to change the batteries.
3.2. Operation Keys:
The meter has 7 operation keys in all.
3.2.1. —Switch key
In the measurement mode open and shutdown function , other mode keys do not
work.

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3.2.2. —Calibration key
(a) When in the measurement state, press this key to enter into calibration mode.
(b)When in the non - measurement state, the key is returned as the exit key.
3.2.3. —Function key
(a)When in pH measurement mode, Short-time press (time<1.5s) switch the measuring
parameters, the meter will display
→
(b) When in Conductivity measurement mode, short press (less than 1.5s) the key to in
turn change measuring mode: COND→RES →TDS →SAL.
（c）Long press(≥2S)switching PH and electrical conductivity measurement mode.
3.2.4. —Back light and data deleting key
(a) When in the measuring state, short press (less than 1.5s) to open or close the back
light display.
(b) When the storage records are queried, long press (more than 5s) to delete the saved
data.
3.2.5. —Adding and querying keys . —Reduce and store keys
(a) When in measurement mode, short time press (less than 1.5s) the key to store
the measuring data. Short time press (less than 1.5s) the key to recall the saved
data;
(b) When in the parameter setting state, press the two key to alter the number.
3.2.6. —The combination key of enter and return.
(a) When in measurement mode, long time press (more than 2s) the key to enter into
parameter setting state;
(b) When in the non measurement state, short time press (less than 1.5s) the key to

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determine the current choice.
3.3. The Storage, Recall and Deletion of the Measuring Information:
3.3.1. Store the measuring information:
In the measuring mode, when the measuring data is stable and appear the “ ”,
short-time press key(≤1.5s),LCD will display “M+ ”icon and storage serial
number, and meanwhile memory all the measuring information. Meter can store 150
groups of data(A total of 150 sets of data stored in a variety of different units).
3.3.2. Recall measuring information:
(a) Under the measuring mode, depress the key, meter will recall the last stored
information, and the storage number and “RM”icon will appear in the lower right
corner of the LCD, and the complete measuring information. Again press
or key, meter will in turn recall all the measuring information.
(b) In the recalling mode, press key to return to the measuring mode.
3.3.3. Deleting the stored measuring information:
In the recalling mode, long-time press the key for 2 seconds, LCD will appear
“ ” for 2 seconds. It means the storage has been eliminated, and returns to
measuring mode.
4. pH Measurement:
4.1. Preparation Work:
4.1.1. Press key to turn on ,press to choose pH measurement mode.
4.1.2 Check E-201-9 composite electrode, check whether the PH composite electrode glass
remains moist. If the glass bubble is damaged, the electrode will not be used
properly. The surface of the bulb is too dry. It needs to be soaked in saturated
potassium chloride solution for 24 hours, then activated, and then used.

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4.1.3.Insert the PH composite electrode and the temperature electrode into the
corresponding interface.
4.2. Meter Calibration:
4.2.1. Press to enter into calibration mode, LCD displays the twinkling “ ”
indicate to enter into the first point calibration.
4.2.2. Wash the pH electrode in purified water and dry it, then immerge it into the pH7.00
buffer solution, rock the electrode holder and then still, waiting for the data stable and
appear “ ”, then again press key , the LCD will appear a twinkling 7.00
pH,make sure that this calibration is unmistakable, please press key to confirm
the first point,at this time the LCD displays the twinkling “ ”，Prompt for second
point calibration，Or press the key to exit the calibration mode.
4.2.3. Wash the pH electrode in purified water and dry it, then immerge it into the pH4.00
buffer solution, rock the electrode holder and then still, waiting for a stable data and
appear“ ”,then again press key , the LCD will appear a twinkling
4.00pH,make sure that this calibration is unmistakable, please press key to
confirm the second point,at this time the LCD displays the twinkling “ ”Prompt
for the third point calibration，Or press the key to exit the calibration mode.
4.2.4. Wash the pH electrode in purified water and dry it, then immerge it into the pH10.01
buffer solution, rock the electrode holder and still, waiting “ ” for the data stable
and appear, then again press key , LCD will appear a twinkling 10.01
pH,,make sure that this calibration is unmistakable, please press key to
confirm the third point, at the same time, exiting the calibration mode into the
measurement mode,at the same time, the lower right corner of the LCD displays
simultaneously,the representative instrument was calibrated at third
points.

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4.2.5.Calibration description:
(a) This meter can adopt random one-point, two-point or three-point automatic calibration,
after the first point calibration (see item 4.2.2.), press to exit calibration
mode and enters into measuring mode. The indication icon “ ” will appear on
the lower left corner of LCD. When the measuring accuracy is ≤±0.1pH, user just
need to choose one kind buffer solution to take one-point calibration according to the
measuring range.
(b) After the second point calibration, (see item 4.2.3.), press to exit calibration
mode and enter into measuring mode. The indication icon “ ” for
tow-point calibration will appear on the lower left corner of LCD. User can choose
pH4.00 and pH 7.00 to calibrate if the measurement is just within the acidity range
and choose pH 7.00 and pH 10.01 to calibrate if just within the alkalinity range.
(c) User should choose three-point calibration so as to reach a more accurate
measurement if the measuring range is wide, or if the electrode has been used for long
or has ageing phenomenon. As to the new electrode which be used for the first time, it
must be calibrated by three-point calibration to keep the unanimity of the meter slope
adjustment with the pH electrode.
4.3. PH Solution Test:
Immerge pH electrode into the sample solution after washing and dry it, rock the
electrode holder and still, when the LCD appears the icon “ ” to take the reading
after displaying value to be stable.
Note: According to the pH equal temperature measuring theory: the closer the
temperature of the sample solution with the calibration solution, the more accurate
the measuring value will be acquired. So please comply with this theory.

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4.4. Parameter Setting:
4.4.1. pH measuring parameter setting schedule (Chart (4-1))
Chart (4-1)
4.4.2 Manual temperature compensation settings(P1)
(a) Depress key enter into setting mode,press enters into P1 mode: see
picture (4-2).
(b) Press or key to change the temperature value;
Long press the two settings keys can be changed quickly;
Press key determines the current settings and returns.
Prompt
Mark
Parameter Setting Items
Parameters
P1
Manual temperature
compensation setting
(0-99.9)℃
P2
Resolution selection
0.1pH/0.01pH
P3
pH standard buffer solution
selection
CH、USA、NIST
P4
Temperature unit setting
℃ ℉
P5
Purified water,Ammonia
added purified water pH
restitution
OFF-ON
P6
Backlight timing shutdown
time setting
(0-20)m/0 means closes this
function
P7
Auto power off setting
(0-20)m/0 means closes this
function
P8
Restore to producer setting
OFF-ON

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(c) Press key to enter into next parameter setting or press key to return
to measuring mode.
4.4.3. Resolution selection (P2)
(a) Press key in the mode P1 choose P2 , press key enters into mode
P2, see picture (4-3).
(b) Press or to choose resolution :
0.1→0.01;
Press key determine the choice.
(c) Press key to enter into next parameter setting or press key to
return to measuring mode.
4.4.4. pH standard buffer solution selection (P3)
(a) press key in mode P2 to choose mode P3,press key enters into
mode P3 see picture (4-4).
(b) Press key or change buffer solution selection;there are Europe &
U.S.A series,NIST series and China series;press key determines the current
settings and returns;
(c) press key enter into next parameter setting or press key to return
to measuring mode.
Three series standard buffer solution values:
CH(China series): 1.68ph 4.00ph 6.86ph 9.18ph 12.46ph
NIS(NIST series):1.68ph 4.00ph 6.86ph 9.18ph 12.46ph
USA(Europe & U.S.A series):1.68ph 4.00ph 7.00ph 10.01ph 12.46ph

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4.4.5. Temperature unit ℃/℉setting (P4)
(a) Short press key in mode P3 to choose mode P4,press key enters into P4
see picture (4-5).
(b)Press or key to choose temperature unit: ℃or ℉,press key
determines and returns;
(c) Press key to enter into next parameter setting or press key return to
measuring mode.
4.4.6.Purified water，Ammonia added purified water pH restitution(P5)
(a) Press key in mode P4 to choose mode P5,press key enters into P5 see
picture (4-6).
(b)Press key and key modified, " OFF "no compensation," H2O "Purified
water pH compensation;" nH3 "ammonia added purified water compensation;
(c)Press key to enter into next parameter setting or press key return to
measuring mode.
4.4.7. Back light display time setting (P6)
(a) Press key in mode P5 to choose mode P6,press key enters into P6 see
picture (4-7).

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(b) Press and key to choose the time of back light auto power off,press
key determines and returns;
(c) Press key to enter into next parameter setting or press key to
confirm and return to measuring mode.
4.4.8. Auto power off time setting (P7)
(a) Press key in mode P6 to choose mode P7,press key enters into P7 see
picture (4-8).
(b)Press or key to choose the auto power off time,press key
determines and returns; " 0"means to shut off auto power function;
(c)Press key to enter into next parameter setting or press key return to
measuring mode.
4.4.9. Restore to producer setting (P8)
(a) Press key in mode P7 to choose mode P8,press key enters into P8 see
picture (4-9).
(b)Press or key to choose “ON ”, then press key
determines,“888 ”flicker means restore to producer setting; press key
return to measuring mode.
（c）This function is used carefully. Once the factory setting is restored, the data that is
stored before the calibration will be deleted.

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4.5. Considerations:
4.5.1. Calibration times of meter rely on the sample, electrode performance and required
accuracy. For high accurate measurement ( ≤±0.02pH), which should be calibrated
immediately with high accurate standard buffer solution, for general accuracy
measuring ( ≤±0.1pH), which can be used almost one week or long time once be
calibrated.
4.5.2. The meter must be re-calibrated in the following situations:
(a) New changed or unused electrode for a long time;
(b) After measuring acid (pH<2) or alkaline (pH>12) solution;
(c) After measuring solution which contains fluoride and concentrated organic solution;
(d) The solution’s temperature is much different with calibration temperature.
4.5.3. The soaking solution in the protecting bottle of front pH electrode is to keep the glass
bulb and junction activating. Loose the capsule, pull out the electrode and wash it in
purified water before measuring. Insert the electrode and screw tight the capsule after
measuring to prevent the solution leaking. If the soaking solution is turbid or moldy,
please wash and change a new one at once.
4.5.4. The preparation of the soaking solution: take 25g analytical pure KCL, dissolved with
purified water and dilute to 100mL. Electrode should avoid soaking in purified water
protein solution and acid fluoride solution for a long time as well avoid getting
touching with organic silicon lipidic matters.
4.5.5. To calibrate the meter with the given value pH buffer solution, the pH value of the
standard buffer solution must be reliable so as to improve the accuracy. Buffer
solution should be changed in time after many times using.
4.5.6. Always keep the meter clean and dry; especially for the socket of meter and electrode,
otherwise it may lead to an inaccurate measurement or invalidity. To clean and dry
them with medical cotton with dehydrated alcohol if there are any dirty.

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4.5.7. The sensitive glass bulb in the front of combination electrode should not touch with
hard things, any broken and rough will make the electrode invalidity. Before and after
measuring, the electrode should be washed with purified water, and dry electrode
after washing, don’t clean glass bulb with tissue for it will effect stability of electrode
potential and enlarge response time. The electrode should be washed many times for
removing the sample stuck on the electrode, or wash with suitable solvent then clean
the solvent with purified water after measuring sticky sample.
4.5.8. An electrode be used for a long time, or measured solution which contains a polluting
solute easily for the sensitive bulb, or a substance resulting in jam at the junction, the
electrode will be getting passivated, its sensitivity will decrease and its response is
getting slow, the reading are not correct. It could adopt the following method for
various cases:
(a) The glass bulb is contaminated and aging: Put the electrode into 0.1mol/L dilute
hydrochloric acid (Preparation: diluted 9mL hydrochloric acid to 1000mL with
purified water) for 24h. Rinse it with purified water, then dipped it into the electrode
dipping solution for 24h. If the passivation is serious, then user can also put the bulb
of electrode into 4% HF (hydrofluoric acid) or the electrode activation solution for 3
to 5 seconds, rinsing it with purified water, and dipped it in the electrode soaking
solution for 24h to renew it.
(b) Wash for contaminated glass bulb and junction: (For reference)
Contamination Abluent
Inorganic metal oxide diluted acid less than 1mol/L
Organic lipidic matter dilute washing (weak alkaline)
Resin macromolecule matter dilute alcohol, acetone, ether
Proteinic haematocyte sediment Acidic enzymatic solution (such as dried yeast)
Kinds of paint dilute bleacher, peroxide

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4.5.9. pH electrode using period is about 1 year, but its life will be shortened if using
condition is poor or incorrect maintenance. So it should be replaced immediately after
electrode become aging or invalid.
4.5.10. When it appears an abnormal reading when calibration or displaying, please set P8 as
“ON”to restore the meter to producer setting mode, and then to calibrate and
measure again.
4.6. The Self-diagnose Information:
When using, there might appear the following icons. This is the meter’s self-diagnose
information, which can help to know some information about the meter or the electrode
when using:
4.6.1. The stable icon -2.00 pH or the 19.99 pH —this icon appeared when the value has
surpassed the measuring range. There will also appear such signs when the electrode
is not well connected with the meter or when the electrode is not immerged into the
solution. This is a normal phenomenon.
4.6.2. “ ” —Electrode zero potential to be exceeded (<-60mV or >60mV)
4.6.3. “ ” —Electrode slope to be exceeded (< 50% or >105%)
When appear “ ” or “ ”, the meter can not work, please take the
following check:
(a) Check if the electrode bulb has air bubble, if has, please shake it hardly.
(b) Check the quality of buffer solution, if it goes bad or the value has biggish error.
(c) Set the meter to producer setting mode (for details see P12 item 4.4.9.), then
re-calibrate it.
If still can not recover the normal state after doing the above checking, please replace a
new pH electrode.

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5. mV Measurement:
5.1. Press key to turn on, and short press to switch to mode;
5.2. Connect the ORPC composite electrode or the ion composite electrode (sold
separated),the electrode is washed and dried in pure water and immersed in the
measured solution., slowly stir and then still. When there appear a “ ” and a
stable reading, that is the value .
6. Conductivity Measurement:
6.1. Preparation Work:
6.1.1.Press key to turn on the meter;press key,choose measurement
mode.
6.1.2.Check whether the DJS-1.0 conductivity electrode ploe piece is intact. If the electrode
pole piece glass is damaged, the conductivity electrode pole piece rusts will cause
the electrode not to be used normally, so we should replace the new electrode.
6.1.3. Connect the DJS-1 conductivity electrode and temperature electrode into the meter.
6.2. Meter’s Calibration (Standard solution calibration method):
Press key, “ ” is flashing on the upper right corner of the LCD, indicate
enters into the calibration mode, wash the DJS-1conductivity electrode with purified
water and dry it, then insert it into the 1413μS/cm calibration solution with temperature
electrode, still it after stirring, Wait for solution stability and “ ” icon appears,
press key,LCD shows the current calibrated solution value 1413μS/cm,confirm the
correct solution of the solution at this time, and then press the key,Save
calibration data and exit the calibration mode according to the key,at this time,
the calibration indication icon and will be displayed at the lower right
corner of the LCD.

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Note: (a) The meter has been calibrated before leaving factory, so generally users
can use it directly.
(b) The standard solution method is aimed at the long time use of
conductance electrode, which leads to inaccuracy of conductance constant.
The new conductance electrode has been calibrated before being released.
Its constant is marked on the electrode and input constant before use.
(c)The electrode constant input method ,first determines the type of electrode
constant. Then, when the input constant coefficient is constant, for example,
the constant is 10.5, select the 10 electrode type first, then set the constant
1.05, that is: 10.5=10*1.05.
6.3. Conductivity solution Test:
6.3.1. Wash the conductivity electrode and throw off the water on it, then insert it into the
solution with temperature electrode, still it after stirring, take the reading after
“ ” appears, which is the conductivity values of this solution.
6.3.2 Short-time press key can display the value of the TDS, salinity or resistivity
value which against the conductivity value.
6.4. Important Statement:
6.4.1. This meter build-in below two kinds of calibration solution series, please set up in the
parameters P4;
(a) (Europe & U.S.A. series) — 84μS/cm, 1413μS/cm, 12.88 mS/cm and 111.9
mS/cm
(b) (China series) — 146.6μS/cm, 1408μS/cm, 12.85mS/cm and 111.3 mS/cm

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6.4.2. This meter has an unique one-point calibration function, to choose one calibration
solution based on the principle of the water samples and calibration solution
conductivity as close as possible, in general the most common calibration solution is
1413 μS/cm. Use the equipped DJS-1 conductivity electrode (K=1), and do calibrate
with 1413 μS/cm calibration solution, can use within the range of less than 100 mS/cm.
Please choose refer to the chart (6-1).
Chart (6-1)
Measuring range
0.05 to 20μS/cm
0.5μS/cm to 200mS/cm
Electrode
constant
K=0.1cm-1(flow test)
K=1.0cm-1
Calibration
solution
84μS/cm
84μS/cm
1413μS/cm
12.88 mS/cm
111.9 mS/cm
Calibration
indication icon
6.4.3. There are two kinds of method which are standard solution calibration method and
constant calibration method for conductivity electrode calibration which have been set
in meter, the statement in item 6.2.“electrode calibration”is the standard calibration
method, and when the accuracy of standard solution is accurate then suggest the
standard solution calibration method is priority selected, it can ensure the best
accuracy. If user used to use constant calibration method, it can be set according to the
constant on the conductance electrode（The new conductance electrode manufacturers
have been standard accurate, customers can be used at ease, such as long-term no use
or fouling. In order to ensure accuracy, first clean up the electrode and then calibrate