The SX731 is a portable water‑quality analyzer that measures pH, ORP, conductivity, TDS, salinity, resistivity and temperature. It is designed for field use in industries such as power, petrochemical, water treatment and environmental monitoring.\n\nThe manual covers instrument overview, technical specifications, LCD display and key functions, step‑by‑step procedures for pH, ORP and conductivity measurement, calibration, data storage, parameter settings, warranty information and troubleshooting. This manual is written in Chinese.
| pH measurement range | -2.00 ~ 19.99 pH |
|---|---|
| pH resolution | 0.1 / 0.01 pH |
| pH accuracy (meter) | ±0.01 pH |
| ORP measurement range | -1999 mV ~ 0 ~ 1999 mV |
| ORP resolution | 1 mV |
| Conductivity measurement range | 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 |
| Conductivity resolution | 0.01/0.1/1 μS/cm, 0.01/0.1 mS/cm |
| Power supply | 2 × AA 1.5 V batteries |
| Dimensions (instrument) | 65 × 120 × 31 mm |
| IP protection rating | IP57 (dust and water resistant) |
| Data storage capacity | 300 measurement groups |
The SX731 can measure pH from –2.00 to 19.99.
The instrument can store up to 300 groups of measurement data.
It is powered by two AA batteries (1.5 V each).
The device meets IP57 rating, providing dust and water resistance.