Benchtop Laboratory Touch Screen Multifunction Meter CX – 705
- Home
- / Benchtop Laboratory Touch Screen Multifunction Meter CX – 705
Benchtop Laboratory Touch Screen Multifunction Meter CX – 705
CX-705 measures pH, redox potential (mV), conductivity, salinity, resistivity, concentration of oxygen dissolved in water in % of saturation or in mg/l, atmospheric pressure & temperature and enables semi-automatic titration.
- The measurements made in all measuring functions are of very high accuracy and stability.
- Unification of the procedures in all measuring functions makes working easier.
- “HOLD” function to freeze the result on the display.
- Signalisation of the result stabilisation “READY” with symbol and sound.
Possibility of sending to a PC a report of calibration – up to 10 last calibrations.
In the pH measuring function:
- Calibration of the pH electrode: 1 to 5 points.
- Automatic detection of the buffers’ value entered by the user.
- Automatic correction of the standard solution value (NIST) along with the temperature changes.
- Possibility to store characteristics of 3 electrodes makes changing them easily.
- Automatic evaluation of the electrode’s condition.
- Depending on the chosen electrode possible measurements in pure water, sewage, pastes, etc.
In the redox (mV) measuring function:
- Precise redox potential measurement (accuracy 0.1mV).
- Possibility to measure redox potential relatively to the entered or measured reference potential – Vref.
- Possibility of automatic calculation of the redox reading in relation to the chloride/silver electrode to the hydrogen electrode.
- Depending on type of the chosen electrode making measurement in pure water, sewage, pastes, etc. Enables readout of the pH electrode parameters – buffer & slope The measuring circuits of pH & Ion connectors are isolated enabling accurate & error free simultaneous measurement s in the same vessel
In the conductivity measuring function:
- Wide measuring range enables measurements in ultra pure water, natural water as well as in very salty solutions.
- Newly introduced function is the resistivity measurement of the tested liquid.
- Salinity measurement in NaCl or KCl on the basis of the actual real characteristics.
- Defining the TDS (Total Dissolved Solids) based on conductivity measurement.
- 6 sub-ranges switched automatically.
- In case of measurements of natural water with conductivity from 60 μS/cm to 1 mS/cm the meter enables using non-linear temperature compensation. The parameters of this type of water is determined in norm EN27888:1999 and concerns surface waters, deep water and well water. This solution lowers the measurement error.
- The measurement accuracy of the ultra pure water with temperature compensation was increased by automatic adjustment of the α coefficient depending on the temperature and kind of trace contaminations.
- Calibration by entering the constant K of the cell or in standard solutions in 1 to 5 points. Wide range of α coefficient 0 to 10 % / °C chosen depending on the measured solution.
- Possibility of changing the reference temperature.
- In set with high accuracy conductivity cell ECF-1. Measuring range 0÷500 mS/cm sufficient for measurements in ultra pure water and high salt concentration samples. Metal electrodes are easy to clean and PVC body protects it against mechanical damage.
- Possibility of storing constant K of 3 conductivity cells.
- Automatic conversion of conductivity into salinity in NaCl or KCl on the basis of the actual characteristics and not a constant coefficient, what greatly increases accuracy.
In the oxygen measurement function:
- Galvanic dissolved oxygen sensor.
- Each of the models equipped with a function of automatic atmospheric pressure measurement with calculation of its influence on the oxygen measurement readout in mg/l.
- The meter with dissolved oxygen sensor are easy to operate.
- Calibration of the oxygen sensor in 1 or 2 points.
- Automatic or manual temperature compensation.
- Possibility of introducing the salinity value with automatic calculation of its influence on the result of oxygen measurement.
- The meter automatically counts the influence of salinity measured in the conductivity mode on the oxygen measurement result.
Other features:
- Automatic or manual temperature compensation.
- Internal clock with date.
- Internal data-logger enables storing up to 4000 measurements taken as single or in series with time, temperature and date.
- The results and calibration data are stored in non-volatile memory.
- Remembers the next calibration date.
- USB output for connecting with PC.
- The meter meets the GLP requirements.
Technical Data
| Function | pH | mV | Conductivity/Salinity | 02(mg/I) | 02(%) | Temperature | |
| Range | -2.000 ÷ 16.000pH | ±2000.0mV | 0 ÷ 2000.mS/cm(autorange)/0 ÷ 239 g/l KCL 0 ÷ 296 g/l Nacl | 0 ÷ 60 mg | 0 ÷ 600%, in air: 0 ÷ 100% | -50.00 ÷ 200.00 °C -58.00 ÷ 392.00 °F 223.15 ÷ 473.15 °K | |
| Accuracy (± 1 digit) | ±0.000pH | ±0.1 mV | <19.99 mS/cm ±0.1%* >20 mS/cm: ±0.25%*/ Salinity 2% | ±0.01 mg/l** | ±0.1** | ±0.1 °C** ±0.1 °F** ±0.1 °K** | |
| Temp compensation | -5 ÷ 110°C | – | -5 ÷ 70°C | -5 ÷ 40°C | -5 ÷ 40°C | – | |
| Input impedance | >1012Ω | 1012Ω | – | – | – | – | |
| a coefficient | – | – | 0.00 ÷ 10.00 %/°C | – | – | – | |
| K constant | – | – | 0.010 ÷ 20.000cm-1 | – | – | – | |
| Resistivity | Range: 0.500Ωcm ÷ 200 MΩcm, accuracy: ±2% of the measured value | ||||||
| Air pressure range | 800 ÷ 1100 hPa, accuracy ±2 hPa | ||||||
| Power | 15V/1A power adapter or external rechareable battery (optional) | ||||||
| Weight | 1400 g | ||||||
| Dimensions(mm) | L = 322,5, W = 232,5, H = 34/30 | ||||||
* The accuracy of the meter only
**The accuracy of the meter only with COG-1 or COG-2 oxygen the accuracy at calibration tempereture ±1%.By the difference ±15 °C. accuracy ±3%,by the different ±10 °C accuracy ±5%.
***The accuracy of the meter only.The total error include them meters and probe’s accuracy in the range 0 ÷ 100 °C the acceptance error of the probe with Pt-1000S register . ±0.27 °C.
lon selective measurements
| Function | lon(M/I) | lon(g/I) | lon(ppm) | lon(pX) |
| Range | 0 ÷ 100 | 0 ÷ 1000 | 0 ÷ 1 000 000 | -2.00 ÷ 16.00 |
| Accuracy (± 1 digit) | ±0.25% | ±0.25% | ±0.25% | ±0.002pX |
| Temp. compensations | -5 ÷ 110 °C | -5 ÷ 110 °C | -5 ÷ 110 °C | -5 ÷ 110 °C |
| Resolution | 0.01/0.1% | 0.01/0.1% | 0.01/0.1% | 0.001/0.01pX |