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MP525

pH/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 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.
● 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.
● Meter has the only product serial number.
● Dustproof and waterproof meter meets IP54 standards. All sockets are seal protected by the silica gel caps.

 

Specification

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
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 MP525 pH/ 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. DO500 DO electrode 1pc
8. pH standard buffer solution（pH4.00, pH7.00 and pH10.01/50mL） 1btl/each
9. 9V power adapter（meter use）e 1pc
10. 6V power adapter（stirrer use） 1pc
11. DO503 membrane cap（DO electrode use） 3pc
12. DO502 DO electrode inner solution（30mL） 1btl
13. Cathode polishing paper 2pc
14. B628 stirring bead 3pc
15.AA battery 2pc
16. RS-232 communication cable 1pc
17. MP525 communication software disk 1pc
18. Operation manual 1unit
19. Brief operation instruction 1unit
20. 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.
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）
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）
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