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1
Brief Instruction
Thank you for choosing Apera Instruments SX731 Portable pH/conductivity/ORP Meter (will be called
“the meter” in short in the following content). Before using the meter, please read this instruction manual
carefully in order to help you properly use and maintain it.
The meter can measure the parameters of pH, ORP, conductivity, TDS, salinity, resistivity, DO and
temperature of water solutions with high accuracy. It is suitable for various applications in different
industries e.g., water treatment, aquaculture, horticulture, pools, beverage making, mining, power plants,
environmental monitoring, etc., especially ideal for in-field use.
The meter has the following features:
1.1.
Built-in microprocessor chip with the intelligent functions of auto. calibration, auto. temperature
compensation, auto. salinity compensation, manual baromatric pressure compensation, data storage,
function settings, auto. power off, and low voltage display etc.
1.2. Adopts digital filter technology to intelligently improve meter’s response speed and accuracy. The
smiley face icon will appear when the reading is stable.
1.3. Pure water modes available for pH and conductivity, significantly increasing the accuracy.
1.4 Unique 1-point conductivity calibration covering a wide range of 0 to 200mS, easy to use.
1.6. Meter’s LCD screen has clear and bright backlit display.
1.7. Built-tough. IP57 waterproof and dust-proof.
2
Technical Specifications
2.1
pH
Measurement range
(-2.00 to 19.99) pH
Resolution
0.1/0.01 pH
Accuracy
Meter: ±0.01 pH; Overall: ±0.02 pH
Input current
≤2×10
-12
A
Input impendance
≥1×1012 Ω
Stability
±0.01 pH/3h
Temp. compensation range
(0 to 100) °C (automatic)
