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SX731

Portable pH&ORP&Conductivity Meter

Introduction

● Multi-parameter meter, equipped with pH electrode, ORP electrode and conductivity electrode, automatic identification of electrode by meter.
● 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.
●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.
● Automatic identification of 8 conductivity standard calibration solutions, two options of standard calibration solutions: Europe and America series and China series.
● Adopt advanced conductivity measurement technology, use conductivity electrode of constant K=1, only need one point calibration and meet the measurement precision requirement of 0.5μS/cm ~ 200 mS/cm.
● Ability to switch among conductivity, TDS, salinity and resistivity. Multinomial calculation for TDS and salinity to ensure the conversion precision of the full scale.
● Conductivity measurement mode has the function of non-linear temperature compensation for high purity water.
● Meter meets IP57 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
Conductivity Measuring range

Conductivity：（0.00~19.99）μS/cm 

（20.0~199.9）μS/cm （200~1999）μS/cm 

（2.00~19.99）mS/cm （20.0~199.9）mS/cm 

TDS: （0 ~ 100）g/L 

Salinity： （0 ~ 100）ppt 

Resistivity：（0 ~ 100）MΩ·cm
  Resolution 0.01/0.1/1μS/cm 0.01/0.1 mS/cm
  Accuracy Meter:±1.0% FS, Overall:±1.5% FS
  Temp. compensation range （0 ~ 50）℃(manual)
  Electrode constant 0.1 / 1 / 10 cm-1
  Benchmark temperature 25℃、20℃ and 18℃

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 SX731 pH/ORP/Conductivity meter 1set
2. 201T-S plastic pH/ATC three-in-one combined electrode 1pcs
3. 301Pt-S plastic ORP combined electrode 1pcs
4. 2301-S plastic conductivity electrode 1pc
5. pH standard buffer solution(pH4.00, pH7.00 and pH10.01/50mL) 1btl/each
6. 1413 μS/cm conductivity standard solution (50mL) 1bottle
7. Screw driver 1pcs
8. Spare AA batteries 2pcs
9. Operation manual 1pcs
10. 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

 class="tdbg01"

Suited for general ORP 

measurement, 8 pin connector.
Conductivity electrode

2301-S Plastic 

conductivity electrode

K=1.0 cm-1，ATC, suited for conductivity 

measurement of general water 

solution, 8 pin connector.
 

DJS-0.1-S Glass 

conductivity electrode

K=0.1cm-1，ATC, suited for pH 

measurement of of high

 purity water, 8 pin connector.
  Glass flow cell Match DJS-0.1-S electrode.
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）
Conductivity standard 84 μS/cm conductivity standard 500mL/250mL/50mL（bottle）
  1413 μS/cm conductivity standard 500mL/250mL/50mL（bottle）
  12.88 mS/cm conductivity standard 500mL/250mL/50mL（bottle）
  146.6 μS/cm conductivity standard 500mL/250mL/50mL（bottle）
  1408 μS/cm conductivity standard 500mL/250mL/50mL（bottle）
  12.85 mS/cm conductivity standard 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