HOME>Water Analysis Equipments>Dissolved Oxygen Meter>Bench Type DO Meter

MP551 pH/mV/ISE/Conductivity/DO Meter

MP551 pH/mV/ISE/Conductivity/DO Meter

MP551 pH/mV/ISE/Conductivity/DO Meter

Introduction ● 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
Contact Now
Detailed Product Description


● 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.



Measuring range



Input current

Input impendance


Temp. compensation range

(-1.999 ~ 19.999)pH

0.1/0.01/0.001 pH

Meter:±0.002 pH, connect meter with electrode:±0.01pH

≤1×10-12 A

≥3×1012 Ω

±0.002 pH/3h

(0 to 100) ℃(automatic or manual)


Measuring range(mV/ORP/EH)



-1999.9mV ~ 0 ~ 1999.9mV


±0.03% FS

Ion Concentration

Measuring range

Display unit


Temp. compensation range

0.00 ~ 14.00 pX


Meter:±0.5 % reading(monovalent), ±1.0 % reading (bivalent)

0 to 60 ℃(automatic or manual)


Measuring range



Temp. compensation range

Electrode constant

Reference temperature

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

0.01/0.1/1μS/cm  0.01/0.1/1 mS/cm

Meter:±0.5% FS,connect meter with electrode:±0.80% FS

(0 ~ 50)℃(automatic )

0.1 / 0.5 / 1 / 5 / 10 / 50 / 100  cm-1

25℃、20℃ and 18℃

Dissolved Oxygen

Measuring range



Response time

Residual current

Temp. compensation range

Salinity compensation range

Air pressure compensation

Automatic calibration

Electrode type

(0 ~ 40.00)mg/L(ppm)  (0 ~ 200.0)%

0.1/0.01 mg/L(ppm)  1/0.1 %

Meter:±0.10 mg/L,connect meter with electrode:±0.40 mg/L

 ≤30 s(25℃, 90% response)

≤0.1 mg/L

(0 ~ 45)℃(automatic)

(0 ~ 45)ppt(automatic)

(80 ~ 105)kPa(automatic)

Air saturated by water; water saturated by air

Polarogram type


Measuring range



-10℃~ 110℃


5~ 60℃range:±0.4℃  other range:±0.8℃

Other Technical Parameters:

Data storage

Storage content


Communication connector

Size and weight

Quality and safety certification

300 groups

Measuring value series number, measuring value, temperature, ATC or MTC state, measuring date and time



160 × 190 × 70mm/880g

ISO9001:2008, CE and CMC

Working Condition

Environment temperature

Environmental humidity

IP rating

5 ~ 35 ℃(0.01grade) 15 ~ 30 ℃(0.001grade)


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
Contact Details

Feedback Online

Please Feel free to give your inquiry in the form below.We will reply you in 24 hours.

Other Products