The DWS-51 is a precision benchtop sodium ion meter designed for high-purity water monitoring in power plants and industrial facilities. Measures sodium ion concentration from 23 g/L down to 0.023 μg/L with simultaneous pNa and [Na+] display. Suitable for universities, research institutes and environmental monitoring applications.
The DWS-51 sodium ion meter is designed for measuring sodium ion concentration in aqueous solutions. It is particularly suitable for quality monitoring of high-purity water in power plants (such as steam, condensate and boiler feed water), and can also be used in universities, research institutes, petrochemical, microelectronics and other sectors to measure sodium ion concentration (or activity) in natural water, industrial wastewater and similar samples.
| Parameter | Specification |
| Model | DWS-51 |
| Instrument Grade | Class 0.05 |
| Measured Parameters | pH/pX, mV, Ion Concentration, Temperature |
| Measuring Range – pH/pX | (0.00–9.00) pNa |
| Measuring Range – Ion Concentration | 23 g/L – 0.023 μg/L |
| Measuring Range – Temperature | (0–100) °C |
| Resolution – pH/pX | 0.01 pNa |
| Resolution – Temperature | 0.2 °C |
| Basic Error | ±0.05 pNa ± 1 digit |
| Stability | ±0.02 pNa/3h |
| Included Electrode | 6801 + 6802 |
| Electrode Holder | Integrated |
| Temperature Compensation | (0–60) °C |
| Calibration | 1-point or 2-point |
| Power Supply | DC 12V |
| Power Consumption | 12W |
| Operating Temperature | 10–30 °C |
| Relative Humidity | ≤75% |
| Dimensions (mm) | 260 × 210 × 80 mm |
| Weight (kg) | 1 |
The DWS-51 is designed to measure sodium ion concentration in aqueous solutions. It is commonly used for quality monitoring of high-purity water in power plants — including steam, condensate and boiler feed water — as well as in universities, research institutes, petrochemical facilities and microelectronics manufacturing to measure sodium ion levels in natural water, industrial wastewater and process water.
The DWS-51 is supplied with electrode 6801 (sodium ion selective electrode) and electrode 6802 (reference electrode). Both are required for accurate sodium ion measurement. Contact us if you need replacement electrodes or application-specific alternatives.
The DWS-51 supports manual temperature compensation within a range of 0–60°C. For samples where temperature varies significantly, we recommend measuring sample temperature and entering it manually before taking readings to ensure accurate results.
The DWS-51 displays both pNa (the negative logarithm of sodium ion activity, similar to pH) and sodium ion concentration [Na+] in g/L or μg/L. pNa is used for precision analytical work, while the concentration display is more practical for process monitoring and direct comparison against regulatory limits.
The DWS-51 supports 1-point or 2-point calibration using standard sodium ion solutions. Two-point calibration is recommended for improved accuracy across a wider concentration range. Refer to the operation manual for the specific calibration procedure and recommended standard solution values.
The sodium ion selective electrode (6801) should be stored in a low-concentration sodium ion standard solution when not in use. Avoid soaking in distilled water for extended periods as this can affect electrode response. Rinse with distilled water between measurements and wipe gently with a soft tissue. Replace the electrode if response becomes sluggish or unstable after reconditioning.
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