Benchtop Laboratory Multifunction Meter Cx – 505


  • CX-505 measures PH, redox potential (mV), conductivity, salinity, resistivity, concentration of oxygen dissolved in water in % of saturation or in mg/l, atmospheric pressure and temperature.
  • 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 stabilization “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.
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 O2 (mg/l) O2 (%) ‎Temperature
Range -2.000 ÷ 16.000 pH ±1.999.9 mV 0 ÷ 1999.9 mS/ cm
0 ÷ 200 g/l KCl
0 ÷ 250 g/l NaCI
0 ÷ 60 mg/l 0 ÷ 60 mg/l -50.0 ÷ 199.9 °C
Accuracy (± 1 digit) ± 0.002 pH ±0.1 mV ±0.1%
>20 mS/ cm: ±0,25%
±0.1 mg/l ±1% ±0.1 °C
Temp. Compensation -5 ÷110 °C -5 ÷ 70 °C 0÷ 40 °C 0÷ 40 °C
Input Compensation 1012ΩΩ 1012ΩΩ
α coefficient 800÷ 1100 hPa
Resistivity Range: 0,500Ωcm, accuracy: ±2% of the measured vlaue
Atm. Pressure Range 800 ÷ 1100 hPa
Dimensions (mm) L=200, W=180, H=20/50

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