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MP512 台式pH计 英文版说明书
2020-10-10

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Model MP512 Precision pH Meter

Operation Manual

Shanghai San-Xin Instrumentation, Inc.

MP500 Series of Electrochemical Meters

一.Multi-parameter Meter

Model MP551pH/mV/ISE/Cond/DO Meter

二.Double Parameter Meters

1. Model MP521 Lab pH/Cond Meter (pH: ±0.01 pH; Conductivity: ±1.0% FS)

2. Model MP522 Precision pH/Cond Meter (pH: ±0.002 pH; Conductivity: ±0.5% FS)

3. Model MP523 pH/ISE Meter

4. Model MP525 pH/DO Meter

5. Model MP526 Cond/DO Meter

三.Single Parameter Meters

  1. MP511 Lab pH Meter (±0.01 pH)

  2. MP512 Precision pH Meter (±0.002 pH)

  3. MP513 Lab Conductivity Meter (±1.0% FS)

  4. MP515 Precision Conductivity Meter (±0.5% FS)

  5. MP516 DO Meter

  6. MP517 Sodium Ion Concentration Meter

  7. MP518 Calcium Ion Concentration Meter

  8. MP519 Fluoride Ion Concentration Meter

Table of Contents

1. Brief Introduction-------------------------------------------------------------------

2. Technical Parameters---------------------------------------------------------------

3. Introductions to the Meter----------------------------------------------------------

3.1. LCD Display---------------------------------------------------------------------

3.2. Operation Keys ------------------------------------------------------------------

3.3. The Storage, Recall and Elimination of the Measuring Information------

3.4. RS-232 Communication--------------------------------------------------------

3.5. Sockets ---------------------------------------------------------------------------

4. pH Measurement--------------------------------------------------------------------

4.1. Preparation Work ----------------------------------------------------------------

4.2. Electrode Calibration -----------------------------------------------------------

4.3. Sample Test-----------------------------------------------------------------------

4.4. Parameter Setting ---------------------------------------------------------------

4.5. Considerations-------------------------------------------------------------------

4.6. Self-diagnose Information-----------------------------------------------------

5. mV and ORP Measurement ------------------------------------------------------

5.1. Sample Test ----------------------------------------------------------------------

5.2. Considerations-------------------------------------------------------------------

5.3. Parameter Setting ---------------------------------------------------------------

6. Meter’s Complete Kit --------------------------------------------------------------

7. Warranty -----------------------------------------------------------------------------

ChartⅠ Meter Parameter Setting Schedule

ChartⅡ Meter Restore to Producer Setting Schedule

Chart Ⅲ Code Icon and Abbreviation Schedule

1. Brief Introduction:

Thanks for buying and using the Model MP512 Precision pH 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 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, sensor technology and software design which is the best lab pH analysis meter with the highest performance and the lowest cost. It is suitable for the trade such as the petroleum, chemical industry, medicine, power plant and environmental protection, etc., especially has more extensive application in the fields of education and scientific research.

Built-in microprocessor chip, beautiful appearance and convenient operations, this meter has the following prominent features:

1.1. Meter meets with the requirement of international GLP standards. Its features up to automatic calibration, automatic temperature compensation, data storage, timing measurement, clock display, RS-232 output, function setting and self-diagnose etc.

1.2. Adopts digital filter and step slipping technology to improve meter’s response speed and result accuracy.     icon will appear when data to be stable.

1.3. Automatically recognize 13 kinds of pH buffer solution. User can choose anyone from four series of standard buffer solutions: Europe & USA series, NIST series, CHINA series and Self-defined series.

1.4. High purified water and ammonia added purified water pH measuring mode can be set up, for this two special pH measuring modes, expect the general slope temperature compensation, also added function of solution temperature  compensation to make measuring accuracy to be more improved, especially suitable for electric power and petrochemical industry.

1.5. With EH redox potential measuring mode can directly display ORP value which against standard potential of hydrogen electrode.

1.6. Meter’s circuit board adopts SMT film-covering technology to improve meter’s reliability.

1.7. Meter has the only product serial number.

1.8. Dustproof and waterproof meter meets IP54 standards. All sockets are seal protected by the silica gel caps.

2. Technical Parameters:

2.1. pH:

Measuring range(-2.000 to 19.999) pH
Resolution0.1/0.01/0.001 pH
AccuracyMeter: ±0.002 pH; meter connect with electrode:±0.01 pH
Input current≤1×10-12 A
Input impendance≥3×1012 Ω
Stability±0.005 pH/3h

Temp. compensation range

(0 to 100) ℃ ( automatic or manual )

2.2. mV:

Measuring range ( mV/ORP/EH )-1999.9 mV to 0 to 1999.9mV
Resolution0.1mV
Accuracy±0.03% FS

2.3. Temperature:

Measuring range-10℃to 110℃
Resolution0.1℃
Accuracy5 to 60℃ range: ±0.4℃  other range: ±0.8℃

2.4. Other Technical Parameters:

Data storage600 groups
Storage contentMeasuring value serial number, measuring value, temperature, ATC or MTC state, measuring date and time
Power

DC9V/300mA

Communication connectorRS-232
Size and weight160 × 190 × 70mm/880g

Quality and safety certification

ISO9001:2000, CE and CMC

2.5. Working Condition:

Environment temperature15 to 30 ℃ ( 0.001 grade )
Environmental humidity≤75%
IP ratingIP54 Dustproof and waterproof  

3. Introductions to the Meter:

3.1. LCD Display:

① —— Parameter mode icon

② —— Measuring value

③ —— Time, date and the indication icons for special measuring state.

④ —— Measuring unit

⑤ —— Temperature compensation state icon:

ATC — automatic temperature compensation

MTC — manual temperature compensation

⑥ —— Serial number and icon of the measuring value stored and recalled.

M+ — measuring value to be stored icon

RM — reading to be recalled icon; The left digit means serial number.

⑦ —— The measured temperature value and unit

⑧ —— RS-232 communication icon. When this icon appears, means meter has been connected with computer.

⑨ —— Timing measuring icon

⑩ —— Electrode calibration indication icon

—— Measuring value stable icon

3.2. Operation Keys:

The meter has 8 operation keys in all.

3.2.1. <     > — Switch key

3.2.2. < CAL > — Calibration key to make meter enter into calibration mode.

3.2.3. < MODE > — Function key

(a) Short-time press (time<1.5s) to switch the parameters, the meter will display and      ;

(b) Depress (time >2s) to enter into the parameter setting mode P1, and again short-time press, will in turn display P2, P3…

3.2.4. < UNIT > —Unit and parameter mode key

(a) when in       mode, press the key to alter pH resolution: 0.001→0.01→0.1pH;

(b) When in mode      , press this key to alter the parameter mode      →  →      →      ;

(c) Press key to choose modified position of parameter when in the parameter setting state.

3.2.5. < ENTER > — Entrance key, when in the state of calibration or parameter setting, press the key to confirm. Then the meter enters into measuring state.

3.2.6. < > and < > — Increase and decrease key.

When in MTC state, press the key to increase or decrease the temperature value. Short-time press to alter 0.1℃ each time, while depress, the temperature will alter rapidly. When in the state of parameter setting, press the key to alter the number or ON/OFF state.

3.2.7. < M+/RM > — The compound key of memory and recall, short-time press (press time <1.5s) to save the measuring data, depress (press time > 2 s) to recall the saved measuring value.

3.3. The Storage, Recall and Elimination of the Measuring Information:

3.3.1. Store the measuring information:

(a) In the measuring mode, short press < M+/RM > key, LCD will display M+ icon and storage serial number, and meanwhile memory all the measuring information including time, date, serial number, measuring data, unit, temperature, temperature compensation state and so on. The meter can store 300 group data when in the mode      and      , can store 600 group data in all.

(b) When setting the timing measuring function,     icon will appear on the LCD, and the meter will measure according to the time intervals set, and stores the measuring information at the same time;

3.3.2. Recall measuring information:

(a) Under the measuring mode, depress the < M+/RM > key, the meter will recall the last stored information, and the storage serial number and RM icon will appear in the lower right corner of the LCD, and the complete measuring information, measuring time and date will be displayed alternatively on the upper right corner. Again press < > or < > key, the meter will recall all the measuring information in turn, depress < > or < > key to rapidly check the measuring information under other serial number;

(b) In the recalling mode (there are RM icon and storage serial number in the lower right corner of the LCD), press < ENTER > key to return to the measuring mode.

3.3.3. Eliminate the stored measuring information:

In the recalling mode, depress the < M+RM > key for 5s,       icon will display on the LCD for 2s. It means the internal storage has been eliminated. Then return to measuring mode.

3.4. RS-232 Communication:

3.4.1. This meter adopts MP512 communication software which can achieve RS-232 communication function. The requirements for computer of this application software are: PC can stable operate the Windows XP operating system (Microsoft Excel 2000 or much higher version has been installed in PC). According to different selection of resolution setting (1280 x 1024 or 1280 x 800) to install MP512 communication software by following the indications. Open the MP512 communication software and connect meter, the LCD will display     RS-232 communication icon. Meanwhile all the stored information including measuring value, measuring unit, temperature, temperature compensation state (ATC or MTC) and the last calibration information (calibration time, date and solution) will be transmitted to the computer.

3.4.2. Again press < M+/RM > key after meter being connected with computer, or  timing measuring function has been set, all the measuring information will be transmitted to computer through RS-232 and won’t be stored in meter. And there will also display a curve graph of measurement value changing with time on the interface of computer.

3.4.3. User can do operation such as analyzing, counting or printing etc. for all measuring information in “Microsoft Excel” file through the key Lead out in the interface of computer.

3.5. Sockets:

3.5.1. REF — Reference electrode socket

3.5.2. pH/mV — pH and ORP electrode socket (BNC)

3.5.3. TEMP — Temperature electrode socket (RCA microphone socket)

3.5.4. RS232 — RS232 communication connector socket

3.5.5. DC9V — DC9V power socket, Ф2.5, inner + outer - .

4. pH Measurement:

4.1. Preparation Work:

4.1.1. Switch in power, press <    > key to turn on.

4.1.2. Short-press < MODE > key to switch to      mode.

4.1.3. Install electrode holder and debug.

4.1.4. Insert the pH electrode into the meter’s socket.

4.2. Electrode Calibration:

4.2.1. Press < CAL > key to enter into calibration mode, LCD displays the twinkling         , indicates 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 to be stable and       icon appears, then again press < CAL > key, the LCD displays a twinkling 7.000pH, calibration finish after several seconds and appear a stable pH value and a twinkling         , indicates the first point calibration has been finished and meter enters into the second point calibration.

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 the data to be stable and       icon appears, then again press < CAL > key, the LCD displays a twinkling 4.005pH, calibration finish after several seconds and appear a stable pH value and a twinkling         , indicates the second point calibration has been finished and meter enters into the third point calibration.

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 then still, waiting for the data to be stable and       icon appears, then again press < CAL > key, the LCD displays a twinkling 10.012pH, calibration finish after several seconds and appear a stable pH and           three calibration indication icon, see picture (4-1). Indicates the three-point calibration has been finished and meter enters into measuring mode.

4.2.5. Note:

(a) This meter can adopt a random one-point, two-point or three-point automatic calibration, after finishing the first point calibration (see item 4.2.2.),  press < ENTER > key to confirm and enter into measuring mode. The indication icon     for one-point calibration will appear in the lower left corner of the 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 < ENTER > key to confirm two-point calibration measuring mode. The indication icon       for two-point calibration will appear in the lower left corner of the LCD. User can choose pH4.00 and pH7.00 to calibrate if the measurement is just within the acidity range and choose pH7.00 and pH10.01 to calibrate if measuring just within the alkalinity range.

(c) It is better to 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 pH electrode, it must do three-point calibration to keep the unanimity of the meter’s slope adjustment with the pH electrode.

4.3. Sample Test:

Wash the pH electrode and dry it, then immerge it into the sample solution, rock the electrode holder and still, then take the reading after the       icon appears on the LCD, it is the pH value.

Note: (a) The closer the temperature of the sample solution and the calibration solution are, the more accurate the measuring value is. This is called the pH equal temperature measuring theory.

(b) Meter equips with 2pcs of pH electrodes, for routine use, suggest to use the 201T-M plastic pH/ATC three-in-one combination electrode, and suggest to use 2503-C glass pH combination electrode for high accuracy measuring, or solution which is weaker ionic strength, high viscosity and feculent, and colloidal solution.

4.4. Parameter Setting:

4.4.1. pH measuring parameter setting schedule (Chart (4-1))

Chart (4-1)

Prompt MarkParameter Setting ItemsCode

Parameters

P1pH buffer solution series selection
USA(Europe & U.S.A series)
NIS (NIST series)
CH (China series)
CUS (Self-defined)
P2pH temperature compensation setting for purified water
OFF-On (shut-set)
P3pH temperature compensation setting for ammonia added purified water
OFF-On (shut-set)
P4Time for timing measuring setting
0 to 99 minutes
P5

Temperature unit setting


℃ ℉
P6Date settingDateMonth / Day / Year
P7Time settingTimeHour / Minute
P8Restore to producer setting
OFF-On ( shut-set)

4.4.2. pH buffer solution series selection (P1)

(a) Depress < MODE > key, meter enters into P1 mode: see picture (4-2).

(b) Press < > or < > key to choose buffer solution series:

(Europe & U.S.A series) — 1.679, 4.005, 7.000, 10.012 and 12.454 pH

(NIST series) — 1.679, 4.006, 6.865, 9.180 and 12.454 pH

(China series) — 1.680, 4.003, 6.864, 9.182 and 12.460 pH

(c) Press < MODE> key enters into next parameter setting or press < ENTER > key to conform and return to measuring mode.

(d) The producer setting is USA (Europe & U.S.A series).

4.4.3. pH buffer solution self-defined setting:

For some special calibration solution, user can set it in the “self-defined” mode, but please pay special attention that the “self-defined” parameters are the values under some fixed temperature, and meter must be calibrated under the same temperature, otherwise there might be a biggish error. The following are the steps of setting the self-defined:

(a) Depress < MODE > key to enter into P1, press < > or < > key to choose the solution series as the      , then again press < CAL > key to enter into the setting interface, show as picture (4-3), the upper right corner “         refers to the setting of the first calibration point.

(b) Press < UNIT > key, the number will in turn move to the right and flash, press < > or < > when the number flashing to alter the number, and set number follow this operation. Picture (4-3) is the whole procedure for one- point, two-point and three-point calibration setting.

Note: If choose       setting, then       icon will appear on the upper right corner of LCD (time display part).

4.4.4. Purified water pH temperature compensation setting (P2)

(a) Short press < MODE > in the mode P1, meter enters into mode P2, see picture (4-4).

(b) Press < > or < > key to choose     (purified water pH temperature compensation setting) or       (shut).

(c) Press < MODE > key enters into next parameter setting or press < ENTER > key to conform and return to measuring mode.

(d) The producer setting is OFF .

NoteThere will appear“       ” icon in the upper right corner of the LCD if purified water temperature function was set.

4.4.5. Ammonia added purified water pH temperature compensation setting (p3)

(a) Short press < MODE > in mode P2 to enter into mode P3, see picture (4-5),

(b) Press < > or < > key to choose     (ammonia added purified water pH temperature compensation setting)or       (shut).

(c) Press < MODE > key enters into next parameter setting or press < ENTER > key to conform and return to measuring mode.

(d) The producer setting is OFF .

NoteIf set the ammonia purified water pH temperature compensation function, there will appear“        ”icon in the upper right corner of the LCD during the measuring mode.

4.4.6. Time for Timing measuring setting (P4)

(a) Short press < MODE > key in mode P3 to enter into mode P4, See picture (4-6).

(b) Press < UNIT > key, the   will move rightward in turn and flash. Press < > or < > to alter the number.

(c) Press < MODE > key enters into next parameter setting or press < ENTER > key to conform and return to measuring mode.

(d) The producer setting is 0 second.

Note: in the form        , the number in the front of is minute, and the maximum setting is 99, in the back of is second, the maximum setting is 59. After setting the timing measurement mode, LCD will display the     icon.

4.4.7. Temperature unit ℃/℉ setting (P5)

(a) Short press < MODE > key in mode P4 to enter into mode P5, see picture (4-7).

(b) Press < > or < > key to choose temperature unit: ℃or℉.

(c) Press < MODE > key enters into next parameter setting or press < ENTER > key to conform and return to measuring mode.

4.4.8. Date setting (P6)

(a) Short press < MODE > key in mode P5 to enter into mode P6, see picture (4-8).

(b) Press < UNIT > key, the number will move rightward and flash, press < > or < > key to alter the number. The upper right is month-day and the lower right is year.

(c) Press < MODE > key enters into next parameter setting or press < ENTER > key to conform and return to measuring mode.

4.4.9. Time setting (P7)

(a) Short press < MODE > key in mode P6 to enter into mode P7, see picture (4-9).

(b) Press < UNIT > key, the number will move rightward and flash, press < > or < > key to alter the number.

(c) Press < MODE > key enters into next parameter setting or press < ENTER > key to conform and return to measuring mode.

4.4.10. Restore to producer setting (P8)

(a) Short press < MODE > key in mode P7 to enter into mode P8, see picture (4-10).

(b) Press < > key to choose     , means that all the pH measuring parameters have been restored to the producer setting mode, and return to measuring mode after 2 seconds.

Special Note: When the parameter setting is compatible with the producer setting, the pH measuring interface displays as picture (4-1), time is displayed in the upper right corner of the LCD. When the some parts of parameter setting are not compatible with the producer setting, the code icon will appear on the upper right corner of LCD. When setting more than two parameters with code icon, LCD will just display one of the code icons. User should enter into the parameter setting interface to view the information or to restore the meter to the producer setting mode, and then reset the needed parameters.

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 recalibrated in the following situations:

(a) New 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. If user do not want to use the temperature electrode, they can press < > or < > to adjust temperature to do manual temperature compensation.

4.5.4. The soaking solution in the protecting bottle in front of 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 from leaking. If the soaking solution is turbid or moldy, please clean and change new one at once.

4.5.5. The preparation of the soaking solution: take 25g analytic pure KCl, dissolve in purified water and dilute to 100mL. Electrode must 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.

4.5.6. To calibrate the meter with the given pH value buffer solution, the pH value of the standard buffer solution must be reliable so as to improve the measurement accuracy. Buffer solution should be changed in time after many times using.

4.5.7. 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 it with medical cotton and non-water alcohol if there are any dirty.

4.5.8. The sensitive glass bulb in the front of combination electrode should not be touched with hard things, any broken and hair 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, after measuring sticky sample or wash with suitable solvent then clean the solvent with purified water.

4.5.9. An electrode 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 grade 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 end of electrode into 4% HF (hydrofluoric acid) 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) Clean for contaminated glass bulb and junction: (FYI)

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

4.5.10. 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.

4.6. The Self-diagnose Information:

When using, there might appear the following icons. This is the meter’s self-diagnosis information, which can help to know some information about the meter or the electrode when using:

4.6.1. The still icon           pH or the icon         pH — this is the 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 (< 85% or >105%)

When appear         or        , the meter will work abnormally, please take the following check:

(a) Check the electrode bulb if has any bubbles, if has, please shake it hardly.

(b) Check the quality of buffer solution, if it goes bad or the value has biggish error.

(c) Restore meter to the producer setting mode (for details see P17 item 4.4.10), then recalibrate it.

If it still can not recover the normal state after the above checks, please replace a new pH electrode.

5.  mV and ORP Measurement:

5.1. Sample Test:

5.1.1. Press <    > to electrify meter, press < MODE > to switch to      mode, then press < UNIT > key to choose      →      →      ;

(a)       — This is the measuring mode of electrode potential. mV value   and the temperature will display at the same time;

(b)       — This is the measuring mode of ORP electrode. ORP measurement has no temperature compensation, so there is no temperature displayed in this mode;

(c)       — This is a special ORP measuring mode. It can show the ORP potential against to the standard hydrogen electrode, EH  value is related to potential of reference electrode. The reference electrode potential which be set by producer is 204.6mV (3.5mol/L KCl, Ag/AgCl the standard potential of reference electrode). It is assorted with the ORP electrode supplied by our factory. If user want to choose other ORP electrode, please check the standard potential value according to its specifications and set the parameters in the meter’s parameter setting P1 (see P24 item 5.3.2.);

Note: — ORP is the abbreviation of “ Oxidation-Reduction Potential ”, signify the Oxidation-Reduction Potential of the solution, ORP is the index about the ability the Oxidation-Reduction Potential of the aqueous solution, its unit is mV.

5.1.2. Connect ORP electrode or ion electrode, immerge it into the sample solution, slowly stir and then still. When there appear a     and a stable reading, that is the ORP value or the potential of the ion electrode.

5.1.3. If it is a combination ORP or ion electrode, user just need to insert it into pH/mV socket, and if the electrode is other type, the user should also need to choose a proper reference electrode to connect into the REF socket and to measure with both of the two electrodes at the same time.

5.2. Considerations:

5.2.1. The meter does not need to be calibrated when do ORP measurement. But if it is interrogative for the ORP electrode quality or the measuring result, it’s better to measure the mV value with the standard solution to identify the ORP electrode or to see if meter is accurate or not.

Our company can offer the following ORP standard solution: 222mV(25℃)±15mV ORP standard solution (warranty 1 year), the inner solution of reference electrode is 3.5mol/L KCl.

Chart (5-1)

℃     mV℃     mV℃     mV℃     mV
10     24220     22730     21538     205
15     23525     22235     20940     201

5.2.2. The clean and activation of ORP electrode: the surface of the platinum will be polluted after the ORP electrode being used for a long time, which will lead to inaccurate measurement and slow response. User can adopt the following method for activation:

  1. For mineral pollution, immerge the electrode into 0.1mol/L dilute hydrochloric acid for 30 minutes, then wash with purified water, and then immerge it into the electrode soaking solution for 6 hours before using.

  2. For the organic oil stain pollution, wash the platinum surface with detergent, and then immerge it into the electrode soaking solution for 6 hours before using.

  3. For the seriously polluted platinum with oxidized membrane, polish the surface with toothpaste, then wash it in purified water, and then immerge it into the electrode soaking solution for 6 hours before using.

5.3. Parameter Setting:

5.3.1. mV and ORP measurement parameter setting schedule (chart (5-2))

Chart (5-2)

Prompt MarkParameter Setting ItemsCodeParameters
P1Reference electrode potential setting
0 to 999.9mV
P2Time for timing measuring setting
0 to 99 minutes
P3Restore to producer setting
OFF-On (shut-set)

5.3.2. Reference electrode potential setting:

(a) Depress < MODE > key in the mode      ,       or      to enter into mode P1 , see picture (5-1).

(b) Press < UNIT > key, the number will move rightward in turn and twinkle, press < > or  < > to alter the number when the number twinkling.

(c) Press < MODE > key enters into next parameter setting or press < ENTER > key to conform and return to measuring mode.

(d) The producer setting is 204.6mV.

Note: If has been set a potential value different from the producer setting value, there will appear “      ” in the upper right corner of the LCD in the measuring mode      .

5.3.3. Time for timing measuring setting (P2):

   Please see P15 item 4.4.6.

5.3.4. Restore to producer setting (P3):

Please see P17 item 4.4.10.

6. Meters Complete Kit:

6.1. Model MP512 Precision pH meter

6.2. Model 602 flexible electrode holder

6.3. 201T-M plastic pH/ATC three-in-one combination electrode

6.4. 2503-C glass pH combination electrode

6.5. MP500 temperature electrode

6.6. pH standard buffer solution(pH 4.00,7.00,10.01/50mL)     1 bottle for each

6.7. 9V power adapter

6.8. RS-232 communication cable

6.9. MP512 communication software CD

6.10. Operation manual

6.11. Brief operation instruction

7.  Warranty:

7.1. We warrant this meter to be free of charge maintain, replace the parts or products under normal using circumstances, from purchased time within one year caused by manufacturing bad and unable to work.

7.2. Attached pH electrode is not belong to this warrant range, besides the temperature electrode. But, if the newly purchased electrode went wrong without using, it’s free of charge to maintain and replace.

7.3. The above warranty is not apply to defects resulting from action of user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.

Chart І Meter Parameter Setting Schedule

ModelPrompt MarkParameter Setting ItemsCodeParameter
pHP1pH buffer solution series selection
USA (Europe & U.S.A. series)
NIS (NIST series)
CH (China series)
CUS (Self-defined)
P2pH temperature compensation setting for purified water
OFF-On (shut-set)
P3pH temperature compensation setting for purified water added with ammonia
OFF-On (shut-set)
P4Time for timing measuring setting
0 to 99 minutes
P5Temperature unit setting
℃ ℉
P6Date settingDateMonth / Day / Year
P7Time settingTimeHour / Minute
P8Restore to producer setting
OFF-On (shut-set)
mVP1Potential of reference electrode setting
0 to 999.9mV
P2Time for timing measuring setting
0 to 99 minutes
P3Restore to producer setting
OFF-On (shut-set)

Chart Meter Restore to Producer Setting Schedule

ModePrompt MarkParameter Setting ItemsProducer Setting ContentCode  
pHP2pH temperature compensation setting for purified waterOFF
P3pH temperature compensation setting for purified water added with ammoniaOFF
P4Time for timing measuring setting0 second

mVP1Potential of reference electrode setting204.6mV
P2Time for timing measuring setting0 second

Chart Code Icon and Abbreviation Schedule

Code and AbbreviationEnglishExplanation

SolutionStandard solution

ChinaChina series standard

USAEurope & U.S.A series standard

NISTNIST series standard

Custom

Self-defined solution

Pure-1pH temperature compensation setting for purified water

Pure-2pH temperature compensation setting for purified water added with ammonia

Volt ReferencePotential of reference electrode setting

End

Calibration

Oxidation-Reduction Potential