DDS-307A is an improved conductivity meter; based on DDS-307 on the market, it is added

with the automatic temperature compensation function, with high price-performance ratio. It

can be widely used for continuous monitoring of conductivity values of the solutions in thermal

power plants, chemical fertilizer, metallurgy, environmental protection, pharmaceutical industry,

biochemical industry, foodstuff and running water.

♦ Double-row nixie tube: To show the conductivity and temperature values respectively

♦ Computer-based: It adopts the high-performance CPU chip, high-precision AD conversion

technology and SMT technology to complete the multi-parameter measurement, temperature

compensation and automatic range switching, with high precision and good repeatability.
♦ Reliability: Single board structure, touch button, no switch knob or potentiometer
♦ Automatic conversion of measuring frequency: To avoid the electrode polarization and improve

the measurement accuracy
♦ 25°C Conversion: Temperature compensation automatic measurement/manual input, with the

waterproof and anti-corrosion design
♦ Network function: RS232 bi-directional communication; it can be equipped with a printer or TLab8.0

communications and data processing software
♦ Measurable high-purity water: Equipped with titanium alloy electrode with the constant of 0.01 cm-1

and an airtight measuring cell; automatic prompting for measuring terminal.

1. Display: Double-row Nixie tube displays the conductivity and temperature values respectively

2. Measuring range: 1-30000μ s/cm, 0-99.9 °C
3. Electrode constant: 0.01~30 μ s/cm (Electrode: K=0.01)
                                  0.1~300 μ s/cm (Electrode: K=0. 1)
                                  1.0~3000 μ s/cm (Electrode: K=1.0)
                                   10~30000 μ s/cm (Electrode: K=10.0)
4. Resolution: 0.001μ s/cm, 0.1°C
5. Electrode constant: 0.001~15.0 cm-1 set by the software
6. Temperature compensated range: automatic: 0-99.9 °C, manual: 0-99.9 °C
7. Temperature coefficient: 0~10%/°C (with 25°C as the reference temperature)
8. Accuracy: ±l0%FS, ±0 3°C
9. Communication interface: RS232 bi-directional communication interface
10. Power supply: AC220V ± 22V, 50Hz ± 1Hz, external power supply
11. Working conditions: ambient temperature: 0-60°C; relative humidity: ≤90
12. Power-down memory: > 5 years
13. Standard configuration: One secondary instrument; one power supply; one bright or platinum black

conductivity electrode with constant l.0; one temperature electrode; a set of electrode support.
14. Ordering guide: To inform the constant of the required electrode; In the measurement of ultra-pure

water, electrode with K=0.01 and sealed measurement slot are required.