Waterproof Portable Multifunction Meter CX – 401


  • CX-401 measures: pH, redox potential (mV), conductivity, resistivity, salinity in KCl or NaCl, TDS, dissolved oxygen in % of saturation or in mg/l, atmospheric pressure and temperature.
  • “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.
  • The meter may be used for the field measurements as well as during accurate laboratory work.
  • The meter is equipped with an easy-to-read back-light LCD display with brightness control.
  • All functions are distinctive by very high accuracy and repeatability. Unification of the operating procedures in all measuring functions makes working trouble-free.
  • Low weight and small size make working in the field easier. Waterproof housing (IP-66) enables working in difficult conditions.
In the pH measurement function:

  • Depending on the kind of applied electrode it may be used for clean water, sewage, soil, meat, paint etc.
  • Calibration of the pH electrode in 1 to 5 points.
  • Automatic detection of buffer solutions, their values may be set by the user.
  • Automatic correction of the pH sample solution value changes along with the temperature changes for NIST standards.
  • Automatic or manual temperature compensation.
  • Possibility of storing characteristics of 3 pH electrodes enables their quick replacing – very useful feature during field work.
  • Automatic control of the electrode’s condition.
  • Readout of the pH electrode condition and data – the zero offset and slope percentage may be checked.
In the mV and redox potential measurement function:

  • Precise Redox potential measurement (accuracy 0.1mV).
  • Possibility of mV measurement in relation to the set or measured reference potential (Vref).
  • Possibility of automatic calculation of the redox reading in relation to chloride/silver electrode to the hydrogen electrode.
In the conductivity measurement function:

  • Full measuring range enables measurements in ultra pure water, natural water as well as in very salty solutions.
  • The liquid resistivity measurement option added.
  • 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 ÷ 10 % / °C chosen depending on the measured solution.
  • Possibility of changing the reference temperature.
  • High accuracy conductivity cell ECF-1 available as additional equipment. 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 to measure electric admittance of tree seedlings – checking the vitality of seedlings after purchasing a special sensor.
In the oxygen measurement function:

  • Possibility of measurement of the oxygen dissolved in the liquids and oxygen in the air.
  • Atmospheric pressure measurement with automatic calculation of its influence on measurement of the dissolved oxygen in water in % or mg/l.
  • Automatic conversion of the salinity measured in the conductivity mode to the oxygen measurement mode with calculation of its influence on the oxygen content value.
  • Easy in use and maintenance galvanic oxygen sensor.
  • 1 or 2 point oxygen sensor calibration.
  • Wide measuring range enables measurements in lakes with blooming vegetation.
Other features:

  • Automatic or manual temperature compensation.
  • Internal clock with date.
  • Collecting up to 4000 results in the internal data logger with temperature, time and date, also taking series of measurements possible. Non-volatile memory of the stored results and calibration data Possibility of connecting with a PC by micro USB connector Software for data transmission and collection delivered in set.
  • Powered by rechargeable batteries, or power adapter with USB – micro USB cable.
  • The meter meets the GLP requirements.
  • 24 months of warranty for the meter.
  • The meter was awarded with a golden medal on International Fair EUROLAB.
  • Possibility of choosing the meter equipped with separate connectors or with multi-pin connector for multifunction measuring head.

Technical Data

Function pH mV Conductivity,Salinity O2 (mg/I) O2 (%)air / water* ‎Temperature
Range -2.000 ÷ 16.000 pH ±1999.9 mV 0 ÷ 1999.9 mS/ cm
0 ÷ 200 g/l KCl
0 ÷ 250 g/l NaCI
0 ÷ 60 mg/l 0 ÷ 100 %
0 ÷ 600 %
-50.0 ÷ 199.9 °C
Accuracy ±0.002 pH ±0.1 mV ±0.1%
>20 mS/cm: ±0,25%
Salinity ± 2%
±0.1 mg/l ±0,2%
±0.1 °C
Temp. Compensation -5 ÷110 °C -5 ÷70 °C 0 ÷40 °C 0 ÷40 °C
Input Compensation 1012ΩΩ 1012ΩΩ
α coefficient 0, 10 % / °C
Resistivity Range:0.500 Ωcm ÷ 200MΩcm, accuracy: ±2% of the measured Value
Atm. Pressure Range 800 ÷ 1100 hPa
Dimensions (mm) L = 149 W = 82 H= 22
Power 2 XAA 1.2V Rechargeable battery, 5V/1000 mA USB power adapter

*Accuracy of the meter. The total error is dependent on the kind of applied probe.

Waterproof Portable Multifunction Meter Suppliers in Mumbai, Maharashtra