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MP551

pH/mV/ISE/Conductivity/DO Meter

Features

For multi-parameter high precision measurement laboratory measuring instrument, covering the pH, ion concentration, conductivity and dissolved oxygen, more than 10 kinds of electrochemical parameters. Suitable for petroleum, chemical, pharmaceutical, power plants and environmental protection industries in the field of education and research more widely used.

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.
 
There are three different measurement modes: stable display mode; time measurement mode; continuous measurement mode.
 
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.
 
High purified water and ammonia added purified water pH measuring mode can be set up, especially suitable for electric power and petrochemical industry
 
With EH redox potential measuring mode can directly display ORP value which against standard potential of hydrogen electrode.
 
Automatically recognize 8 kinds of conductivity standard solution. User can choose anyone from two series of solutions: Europe & USA series and China series.
 
Adopt advanced and original conductivity measurement technology, use 1 pc of conductivity electrode (K=1), it can meet measuring accuracy requirement for range within 0.5μS/cm ~ 200mS/cm by using only one-point calibration.
 
Automatically select conductivity measurement range, when measuring high pure water, equipment automatically enter into temperature compensation of nonlinear model, especially for electricity, microelectronics and the pharmaceutical industry requirements.
 
Equips new type of DO electrode which has function of automatic temperature compensation and automatic salinity compensation as well as automatic air pressure compensation inside meter to make DO measuring mode has temperature, air pressure and salinity automatic compensation, easy to use, accurate to measure.
 
Polarogram type DO electrode has special electrode calibration cap. Only needs 3 to 5 minutes for electrode polarization. Electrode adopts combination diaphragm cap which very convenient to use. Each DO electrode equips with three spare diaphragms caps.
 
There are 10 kinds of common ions can be selected in the ion concentration measuring mode, user also can self-define other ions.
 
Can switch 4 kinds of concentration unit : pX, mol/L, mg/L and ppm
 
Meter has the only product serial number.
 
Dustproof and waterproof meter meets IP54 standards. All sockets are seal protected by the silica gel caps.
 

Specifications

pH Measuring range （-1.999 ~ 19.999）pH
Resolution 0.1/0.01/0.001 pH
Accuracy Meter:±0.002 pH, connect meter with electrode:±0.01pH
Input current ≤1×10-12 A
Input impendance ≥3×1012 Ω
Stability ±0.002 pH/3h
Temp. compensation range (0 to 100) ℃（automatic or manual）
mV Measuring range(mV/ORP/EH) -1999.9mV ~ 0 ~ 1999.9mV
Resolution 0.1mV
Accuracy ±0.03% FS
Ion Concentration Measuring range 0.00 ~ 14.00 pX
Display unit pX、mol/L、mg/L、ppm
Accuracy Meter:±0.5 % reading(monovalent), ±1.0 % reading (bivalent)
Temp. compensation range 0 to 60 ℃（automatic or manual）
Conductivity Measuring range Conductivity：（0.00~20.00）μS/cm （20.0~200.0）μS/cm
（200~2000）μS/cm  （2.00~20.00）mS/cm
（20.0~200.0）mS/cm （200~2000）mS/cm（K=10）
Resistivity：（0 ~ 100）MΩ·cm
TDS:  （0 ~ 100）g/L
Salinity： （0 ~ 100）ppt
Resolution 0.01/0.1/1μS/cm  0.01/0.1/1 mS/cm
Accuracy Meter:±0.5% FS,connect meter with electrode:±0.80% FS
Temp. compensation range （0 ~ 50）℃（automatic ）
Electrode constant 0.1 / 0.5 / 1 / 5 / 10 / 50 / 100  cm-1
Reference temperature 25℃、20℃ and 18℃
Dissolved Oxygen Measuring range （0 ~ 40.00）mg/L(ppm)  （0 ~ 200.0）%
Resolution 0.1/0.01 mg/L(ppm)  1/0.1 %
Accuracy Meter：±0.10 mg/L，connect meter with electrode：±0.40 mg/L
Response time  ≤30 s（25℃, 90% response）
Residual current ≤0.1 mg/L
Temp. compensation range （0 ~ 45）℃（automatic）
Salinity compensation range （0 ~ 45）ppt（automatic）
Air pressure compensation （80 ~ 105）kPa（automatic）
Automatic calibration Air saturated by water; water saturated by air
Electrode type Polarogram type
Temperature Measuring range -10℃~ 110℃
Resolution 0.1℃
Accuracy 5~ 60℃range：±0.4℃  other range：±0.8℃

Other Technical 

Parameters:

 Data storage 300 groups
Storage content

Measuring value series number, measuring value, 

temperature, ATC or MTC state, measuring date and time
DC9V/300mA
Power RS232
Communication connector 160 × 190 × 70mm/880g
Size and weight ISO9001:2008, CE and CMC

Quality and safety 

certification

  
Working Condition Environment temperature 5 ~ 35 ℃（0.01grade） 15 ~ 30 ℃（0.001grade）
Environmental humidity ≤75%
IP rating IP54 Dustproof and waterproof

 

Standard Kit Includes

1. Model MP551 pH/mV/ISE/Cond/DO meter 1set
2. Model 602 flexible electrode holder 1pc
3. Model 901 intelligent stirrer 1set
4. 201T-M plastic pH/ATC three-in-one combination electrode 1pc
5. 2503-C glass pH combination electrode 1pc
6. MP500 temperature electrode 1pc
7. 2401-M conductivity electrode 1pc
8. DO500 DO electrode 1pc
9. Model 6213 double salt bridge reference electrode 1pc
10. pH standard buffer solution（pH4.00、pH6.86、pH9.18/50ml） 1btl/each
11. 1413μS/cm conductivity standard solution (50 mL) 2btls
12. 9V power adapter (meter use) 1pc
13. 6V power adapter (stirrer use) 1pc
14. DO503 membrane cap (DO electrode use) 3pc
15. DO502 DO electrode inner solution (30 mL) 1btl
16. Cathode polishing paper 2pcs
17. B628 stirring bead 3pcs
18. AA battery 4units
19. RS-232 communication cable 1pc
20. MP551 communication software disk 1pc
21. Operation manual 1unit
22. Brief operation instruction 1unit
23. Packing List 1pc

 

Optional Accessories

Accessory Categry Description Specifications

pH combination 

electrode

 201-C plastic combination pH electrode

Suitable for routine pH measurements, 

widely used, BNC connector.
200-C plastic combination pH electrode

Suitable for routine pH measurements,

 long continuous, high precision, BNC plug.
206-C plastic combination pH electrode

Smaller diameter electrode, suitable for small

 diameter container in a test, BNC connector
201T-M plastic three-in-one combination pH electrode

Simultaneous measurement of pH and temperature, 

automatic temperature compensation, 

BNC + RCA plugs.
2501-C glass combination pH electrode

For precise pH test, routine

 laboratory use, BNC plug.
2503-C glass combination pH electrode

For precise pH test, used to measure 

 

complex samples, BNC plug.
2503D-C glass combination pH electrode

For low-temperature solution and pure water 

pH measurement, BNC plug.
2503G-C glass combination pH electrode

Suitable for high temperature 

solution pH measurements, BNC plug
2503S-C glass combination pH electrode

For acid and high-temperature 

solution pH measurements, BNC plug.
2015P-C plane combination pH electrode

For the surface and trace solution 

pH measurement, BNC plug.
Ion electrode 7801 Sodium ion electrode

Used to test the concentration 

of sodium ion，BNC plug
CA501 Calcium composite electrode

used for testing Calcium 

concentration，BNC plug
Calcium electrode probe Used with CA501 electrode
F502 Fluoride electrode Used to test Fluoride concentration，BNC plug
CL502 Chloride electrode

Used to test the concentration 

of chloride ion，BNC plug
BR502 Bromide electrode

Used to test the concentration of 

bromide ion，BNC plug
I502 Iodide Electrode

Used to test the concentration of 

iodide ion，BNC plug
CU502 Copper electrode

Used to test the copper concentration，

BNC plug
K502 Potassium electrode

Used to test the concentration 

of potassium ion，BNC plug
NO502 Nitrate electrode

Used to test the concentration 

of nitrate ion，BNC plug
NH501 Ammonia electrode

Used to test the ammonia 

concentration，BNC plug

Reference

 Electrode

 6211 Reference electrode Suitable for routine measurements, banana plugs.
6212 Reference electrode

Equipped with the 7801 sodium ion 

electrode, banana plugs
6213 Reference electrode

The first and second salt bridge solution 

 

can be chosen, for all measurement

 occasions, banana plugs.
6215 Reference electrode

Most ion electrode for supporting 

the use, banana plugs

Conductivity 

Electrode

DJS-0.1-M Pure water 

conductivity electrode

K=0.1 cm-1，Automatic temperature 

compensation, for testing the 

conductivity of high pure water, 4-pin plug
2401-M Glass conductivity electrode

K=1.0 cm-1，Automatic temperature 

compensation, precision laboratory 

test for conductivity, 4-pin plug.
2301-M Plastic conductivity electrode

K=1.0 cm-1，Automatic temperature 

compensation for laboratory and 

field testing, 4-pin plug.
2310-M Plastic conductivity electrode

K=10 cm-1，Automatic 

temperature compensation, 

used to test seawater and 

concentrated salt water, etc., 4-pin plug
Glass flow cell Equipped with DJS-0.1-M electrode
DO Electrode DO500 DO electrode

Polarographic-type DO electrode，

For laboratory and field using, 8-pin plug

DO Electrode 

attachment

 DO503 DO electrode membrane cap

Combined membrane cap，Dedicated to 

the DO500 DO electrode, size: 3 / group
DO502 DO electrode electrolyte

Added electrolyte, dedicated to the 

DO500 DO electrode, 

specifications: 30mL/bottle
DO501 Cathode polishing paper

Polishing paper, dedicated to clean 

DO500 DO electrode cathode, Size: 2 / group.
ORP Composite electrode 301Pt-C Plastice ORP combination electrode

ORP measurement for conventional, 

wide range of uses, BNC plug
3501Pt –C Glass ORP combination electrode

ORP measurement of routine laboratory, 

test stability, fast response, BNC plug

Temperature 

Electrode

 MP500 Temperature electrode

Stainless steel housing, fast response, 

high accuracy, RCA plugs
pH Buffer pH4.00 buffer 500mL/250mL/50mL（bottle）
pH6.86 buffer 500mL/250mL/50mL（bottle）
pH7.00 buffer 500mL/250mL/50mL（bottle）
pH9.18 buffer 500mL/250mL/50mL（bottle）
pH10.01 buffer 500mL/250mL/50mL（bottle）
Ion standard solution 10-1 mol/L Na+ Standard Solution 500mL/250mL/100mL（bottle）
10-1 mol/L Ca2+ Standard Solution 500mL/250mL/100mL（bottle）
10-1 mol/L F- Standard Solution 500mL/250mL/100mL（bottle）
10-1 mol/L Cl- Standard Solution 500mL/250mL/100mL（bottle）
10-1 mol/L Br- Standard Solution 500mL/250mL/100mL（bottle）
10-1 mol/L I- Standard Solution 500mL/250mL/100mL（bottle）
10-1 mol/L K+ Standard Solution 500mL/250mL/100mL（bottle）
10-1 mol/L Cu2+ Standard Solution 500mL/250mL/100mL（bottle）

10-1 mol/L Ammonium ion 

Standard Solution

 500mL/250mL/100mL（bottle）
10-1 mol/L NO3 Standard Solution 500mL/250mL/100mL（bottle）

Conductivity 

Calibration Solution

84 μS/cm Conductivity 

Calibration Solution

 500mL/250mL/50mL（bottle）

1413 μS/cmConductivity

Calibration Solution

 500mL/250mL/50mL（bottle）

12.88 mS/cmConductivity

Calibration Solution

 500mL/250mL/50mL（bottle）

146.6 μS/cmConductivity

Calibration Solution

 500mL/250mL/50mL（bottle）

1408 μS/cmConductivity

Calibration Solution

 500mL/250mL/50mL（bottle）

12.85 mS/cmConductivity

Calibration Solution

 500mL/250mL/50mL（bottle）
Electrode soaking

pH（ORP）Combination 

Electrode Soaking Solution

 500mL/250mL/100mL（bottle）

10-5 mol/L Sodium ion

 electrode soaking Solution

Equipped with 7801Sodium 

electrode . 500mL/250mL/100mL（bottle）

Electrode 

add liquid

3.5mol/L KCl（AgClSaturated) 

reference solution

 250mL/50mL/30mL（bottle）

1mol/LPotassium nitrate 

(KNO3) reference solution

For chlorine, bromine, iodine 

and copper ion test, and equipped with 

6215 reference electrode, 

 

250mL/100mL/30mL（bottle）

1mol/L Sodium chloride 

(NaCl) reference solution

Test for potassium, and equipped with 

6215 reference electrode,

250mL/100mL/30mL(bottle）

0.1mol/L Cesium chloride 

(CsCl) reference solution

Test for sodium，and equipped 

with 6212 reference 

 

electrode,250mL/100mL/30mL（bottle）
Ammonia electrode inner solution

Test for ammonium ion, and equipped with NH501 

ammonia electrode,250mL/100mL/30mL (bottle）
Calciumelectrode inner solution

equipped with CA501 Calcium 

electrode, 250mL/100mL/30mL（bottle）

Electrode

 

 add liquid

3.5mol/L KCl（AgClSaturated)

 reference solution

 500mL/250mL/100mL（bottle）

1mol/LPotassium nitrate 

(KNO3) reference solution

For chlorine, bromine, iodine and copper ion test, 

and equipped with 6215 

reference electrode, 

250mL/100mL/30mL（bottle）

1mol/L Sodium chloride

 (NaCl) reference solution  

Test for potassium, and equipped with 6215 

reference electrode，

250mL/100mL/30mL（bottle）

0.1mol/L Cesium chloride

 (CsCl) reference solution 

Test for sodium，and equipped with 

6212 reference electrode,

250mL/100mL/30mL（bottle）
Ammonia electrode inner solution 

Test for ammonium ion, and equipped with 

NH501 ammonia electrode ，

250mL/100mL/30mL（bottle）
Calcium electrode inner solution

equipped with CA501 Calcium 

electrode, 250mL/100mL/30mL（bottle）

ORP standard 

solution

 222 mV ORP Standard solution 250mL/100mL/50mL（bottle）

Electrode 

holder

Model 602 Flexible

 Electrode Holder

Nice appearance of the arc-type bracket, 

you can turn 360 degrees and vertical lift

Model 601Stirring 

Type Electrode Holder

The electrode holder and magnetic

 stirrer combination of new products.
Model 600 Electrode Holder Cheap simple electrode holder