The Apera Instruments SX751 is a versatile, portable multi-parameter meter designed for laboratory-quality measurements of pH, dissolved oxygen (DO), redox potential (ORP), conductivity (EC), TDS, salinity, and resistivity in general water solutions. Its rugged, dust- and water-resistant (IP57) design makes it ideal for use in harsh field environments.
The SX751 includes a memory function capable of storing up to 400 data sets, which can be easily retrieved for analysis. Its accurate and fast measurements are made possible by high-quality electrodes, such as the 201T-S pH/Temp. electrode with lithium glass membrane, the 2301T-S BPB conductivity electrode, and the DO500 polarographic DO electrode, each providing reliable, fast results.
For DO measurements, the DO500 electrode is polarized within just 5 minutes, and the integrated automatic temperature and salinity compensation ensures precise results. The 301Pt-S ORP electrode, with its high-quality platinum sensor, provides accurate ORP measurements without the need for calibration.
Key Features:
✔ Multi-parameter measurement – pH, DO, ORP, EC, TDS, salinity, resistivity
✔ Fast and accurate readings – Integrated digital filter technology for enhanced precision
✔ Memory function – Stores up to 400 data sets
✔ Field-ready design – IP57 dust and water resistance
✔ Replaceable electrodes – Includes 3 replacement membrane caps for the DO500 electrode
✔ Calibration made easy – Quick 1-3 point pH calibration and 1-point EC calibration
✔ Complete test kit – Supplied with all necessary accessories in a rugged carrying case
✔ 3-year manufacturer’s warranty (6 months for electrodes)
Complete Set Includes:
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SX751 portable pH/DO/ORP/EC/TDS/salinity/resistivity meter
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201T-S pH/Temp. electrode
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301Pt-S ORP electrode
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2301T-S conductivity/Temp. electrode
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DO500 polarographic DO electrode
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Calibration solutions: pH 4.00, pH 7.00, pH 10.01 (50 ml each)
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1413 μS Conductivity calibration solution
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DO502 electrolyte solution for refilling
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3x DO503 membrane caps
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Polishing paper for electrode cleaning
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Manual
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2x AA batteries
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Screwdriver
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Robust carrying case
| Conductivity (EC) | |
| Accuracy | Device: ±1.0 F.S, Total: ±1.5% F.S |
|---|---|
| Electrode Constant | 0.1 / 1 / 10 cm-1 |
| Measuring Range | Conductivity: (0.00 to 19.99) μS/cm, (20.0 to 199.9) μS/cm (200 to 1999) μS/cm, (2.00 to 19.99) mS/cm (20.0 to 199.9) mS/cm TDS: (0 to 100) g/L; Salinity: (0 to 100) ppt Resistivity: (0 to 100) MΩ·cm |
| Reference Temperature | 25°C, 20°C, and 18°C |
| Resolution | 0.01/0.1/1 μS/cm; 0.01/0.1 mS/cm |
| Temp. Compensation | (0 to 50) °C (automatic) |
| Dissolved Oxygen (DO) | |
| Accuracy | ±0.30 mg/L (ppm), incl. Electrode error |
| Air Pressure Compensation | (66 to 200) kPa (manual) |
| Automatic Calibration | Air saturated with water; water saturated with air |
| Electrode Type | Polarographic |
| Measuring Range | (0 to 19.99) mg/L (ppm); (0 to 200.0) %. |
| Resolution | 0.1/0.01 mg/L (ppm); 1/0.1 % |
| Response Time | ≤ 30s (90% response at 25°C) |
| Salinity compensation range | (0 to 45) ppt (automatic) |
| Temp. compensation | (0 to 45) °C (automatic) |
| More | |
| Data Storage | 400 data sets |
| Dimensions and Weight | Meter: (65×120×31) mm/180 g Complete set: (255×210×50) mm/1760 g |
| IP Rating | IP57 |
| Memory Values | Serial number, measured value, measuring unit and temperature |
| Power Supply | 2 AA batteries (1.5V x2) |
| Quality and safety certification | CE, ISO 9001:2015 |
| pH | |
| Accuracy | Instrument: ±0.01 pH; Total: ±0.02 pH |
| Input Current | ≤2×10-12 A |
| Input Impedance | ≥1×1012Ω |
| Measuring Range | (-2.00 to 19.99) pH |
| Resolution | 0.1/0.01 pH |
| Stability | ±0.01 pH/3h |
| Temp. Compensation | (0 to 100) °C (automatic) |
| Redox Potential (ORP) | |
| Accuracy | Device: ±0.1% FS, Total: ±15 mV |
| Measuring Range (mV/ORP/EH) | -1999mV to 0 to 1999mV |
| Resolution | 1 mV |
Everything is perfect. I would recommend!
