The DDS-11A is a benchtop conductivity meter with LCD display, measuring conductivity (0.05 μS/cm to 20.0 mS/cm) and resistivity. Features automatic frequency and range switching, auto/manual temperature compensation and RS232 output. Optimised for pure water, drinking water and environmental water quality applications where conductivity values fall within the lower measurement range.
The DDS-11A benchtop conductivity meter is a focused, reliable instrument for conductivity and resistivity measurement in applications where sample conductivity falls within the 0.05 μS/cm to 20.0 mS/cm range. This includes drinking water quality testing, pure and purified water monitoring, environmental water analysis, boiler feed water and pharmaceutical water applications — environments where a narrower, more specialised measurement range is appropriate and TDS or salinity measurement is not required.
Sharing the same traditional LCD display, calibration approach and physical design as the DDS-401, the DDS-11A is straightforward to operate and maintain. Automatic frequency and range switching selects the correct measurement conditions within its range without manual intervention, and auto temperature compensation from -5.0°C to 110.0°C via an optional T-820D probe ensures accurate readings across varying sample temperatures.
For laboratories already using the DDS-401 and needing a dedicated instrument for lower-conductivity sample types, the DDS-11A provides a clean, purpose-matched solution that avoids the range and accuracy compromises of using a wide-range meter for low-conductivity measurement.
| Model | DDS-11A | |
| Measuring Range | Conductivity | 0.05 μS/cm – 20.0 mS/cm |
| Resistivity | 20.00 Ω·cm – 2.000 MΩ·cm | |
| TDS | — | |
| Salinity | — | |
| Temperature | -5.0 ~ 110.0 °C | |
| Accuracy (±) | Conductivity | ±1% FS |
| Resistivity | ±1.0% FS | |
| TDS | — | |
| Salinity | — | |
| Temperature | ±0.2 °C | |
| Included Sensor | DJS-1N (black) | |
| Optional Sensors | DJS-0.01 / DJS-0.1 / DJS-1 (bright) / DJS-10 / T-820D | |
| Electrode Connector | BNC / RCA | |
| Display | LCD + LED backlight | |
| Electrode Holder | Included | |
| Temperature Compensation | (-5.0 ~ 110.0) °C Auto / Manual | |
| Calibration | 1–3 point standard solution / Electrode constant | |
| Standard Solutions | 146.5 μS/cm / 1408.3 μS/cm / 12.852 mS/cm / 111.31 mS/cm | |
| Data Storage | — | |
| Connectivity | RS232 | |
| Printing | GLP-compliant format | |
| User Management | — | |
| Date / Time | — | |
| Prompt Tone | Yes | |
| Power Supply | DC 12V | |
| Operating Temperature | 5°C ~ 40°C | |
| Relative Humidity | ≤80% | |
| Dimensions (mm) | Approx. 260 × 210 × 80 mm | |
| Weight (kg) | 1 | |
Both models share the same LCD display, calibration method, connectivity and physical design. The key difference is measurement range and supported parameters. The DDS-11A covers 0.05 μS/cm to 20.0 mS/cm and measures conductivity and resistivity only — no TDS or salinity. The DDS-401 covers a wider range up to 200.0 mS/cm and additionally measures TDS and salinity. Choose the DDS-11A when your samples consistently fall within the lower conductivity range and TDS or salinity readings are not needed; choose the DDS-401 for wider-range or multiparameter measurement.
The DDS-11A is designed for applications where sample conductivity is low to moderate, including drinking water quality monitoring, pharmaceutical purified and water for injection (WFI) testing, boiler feed water analysis, environmental surface water and groundwater monitoring, laboratory reagent water quality verification and educational laboratory use. Its focused range avoids the measurement trade-offs that can occur when using a wide-range meter for low-conductivity samples.
No. The T-820D temperature probe is an optional accessory. Without the probe, temperature must be entered manually for temperature compensation. For applications requiring automatic temperature compensation, the T-820D probe is recommended and can be ordered separately.
No. The DDS-11A measures conductivity, resistivity and temperature only. TDS and salinity measurement are not supported. If TDS or salinity readings are required, the DDS-401, DDS-411 or DDS-421 are the appropriate choices.
The DDS-11A supports 1 to 3 point standard solution calibration using the built-in reference values (146.5 μS/cm, 1408.3 μS/cm, 12.852 mS/cm and 111.31 mS/cm) and electrode constant calibration for specific electrodes. For drinking water and pure water applications, single-point calibration with the 146.5 μS/cm standard solution is typically sufficient.
The included DJS-1N (black, cell constant 1.0) electrode covers 2–20000 μS/cm and is suitable for most applications within the DDS-11A’s range. For very low-conductivity pure or ultrapure water samples (below 2 μS/cm), the optional DJS-0.1 electrode (cell constant 0.1) is recommended. Contact us to confirm the optimal electrode for your specific sample type and conductivity range.
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