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SX725

Portable pH/Dissolved Oxygen Meter

Introduction

● Built-in microprocessor chips, intelligent functions such as automatic calibration, automatic temperature compensation, data storage, function set-up, self-diagnose information, automatic power-off and low voltage display.
● Double-parameter meter, equipped with pH electrode and dissolved oxygen electrode, automatic identification of electrode by meter.
● Automatic identification of 13 pH standard buffer solutions, three options of standard buffer solutions: Europe and America series, NIST series and China series.
● Able to set pH measurement modes of high purity water and pure water with ammonia.
● Measurement mode of Dissolved oxygen has the function of automatic temperature compensation, automatic salinity compensation and manual air pressure compensation.
● New polarographic type dissolved oxygen electrode can measure temperature, salinity and dissolved oxygen simultaneously, equipped with special dissolved oxygen electode calibration set, polarization only for 3~5 min.
● Meter meets IP57 waterproof rating, equipped with calibration solution and portable case.
 

Specification

Category Product Name Basic features and specifications
PH Measuring range （-2.00 ~ 19.99）pH
  Resolution 0.1/0.01 pH
  Accuracy Meter:±0.01pH; Overall: ±0.02pH
  Input current ≤2×10-12 A
  Input impendance ≥1×1012 Ω
  Stability ±0.01 pH/3h
  Temp. compensation range （0 ~ 100）℃(automatic)
ORP Measuring range (mV/ORP/EH) -1999mV ~ 0 ~ 1999mV
  Resolution 1mV
  Accuracy Meter:±0.1% FS, Overall: ±15mV
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, Overall:±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)
 

Atmospheric pressure 

compensation range

 （66 ~ 200）kPa (manual)
  Automatic calibration

Air saturated by water; water 

saturated by air
  Electrode type Polarogram type
Other Technical Parameters Data storage 200 groups
  Storage content

Series number, measuring value 

measuring unit and temperature,
  Power Two AA batteries (1.5V x2)
  Size and weight

meter：(65×120×31)mm/180g；

Suitcase： (360×270×76)mm/1.6Kg
  Quality and safety certification ISO9001:2000, CE and CMC
Working Condition Environment temperature 5 ~ 35 ℃（0.01grade）
  Environmental humidity ≤85%
  IP rating IP57 Dustproof and waterproof
 

Standard Kit Includes

1. Model SX725 pH / mV / DO meter 1set
2. 201T-S plastic pH/ATC three-in-one combined electrode 1pcs
3. DO500 DO electrode 1pcs
4. pH standard buffer solution( pH4.00, pH7.00 and pH10.01/50mL) 1btl/each
5. DO503 membrane cap (DO electrode use) 3个
6. DO502 DO electrode inner solution (30mL) 1pcs
7. Cathode polishing paper 1pcs
8. Screw driver 1pcs
9. Spare AA batteries 2pcs
10. Operation manual 1pcs
11. Carrying case 1unit
 

Optional Accessories

Accessory Category Description Specifications

pH combination 

electrode

201T-S plastic three-in-one 

pH electrode

Measure pH and temperature 

simultaneously, ATC, suited for 

general pH measurement, 

8 pin conncetor.
  2503DT-S glass three-in-one combintion pH electrode

ATC, suited for pH measurement 

of solution under low temperature 

and pure water, 8 pin connector.
  Glass flow cell Match 2503DT-S electrode.

ORP combination 

electrode

301Pt-S Plastic ORP

combination electrode

Suited for general ORP 

measurement, 8 pin connector.
DO electrode DO500 DO electrode

Polargrafic DO electrode, suited

 for application in lab and field, 

8 pin connector.
DO electrode accessory

DO503 DO electrode

membrane cap

Combined membrane cap, 

special for DO500 DO electrode, 

specification: 3 units per group.
  DO502 DO electrode electrolyte

Supplement electrolyte, special 

for DO500 DO electrode, 

specification: 30mL/bottle.
 

DO501 negative electrode 

polishing paper

Polishing paper，special for 

cleaning negative electrode of 

DO500 DO electrode, specification:

2 pcs/group.
pH buffer pH4.00 buffer 500mL/250mL/50mL（bottle）
  pH6.86 buffer 500mL/250mL/50mL（bottle）
  pH9.18 buffer 500mL/250mL/50mL（bottle）
  pH7.00 buffer 500mL/250mL/50mL（bottle）
  pH10.01 buffer 500mL/250mL/50mL（bottle）

Electrode soaking 

solution

pH（ORP）combination 

electrode soaking solution

 500mL/250mL/50mL（bottle）
ORP standard solution 222 mV ORP standard solution 250mL/100mL/50mL（bottle）
Portable case Small portable case（255×210×50）mm Match single electrode.
  Big portable case（360×270×76）mm Match multi- electrode