WATERPROOF MULTIFUNCTION METER CX-401
FOR FIELD AND LABORATORY USE

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The most important features:

• CX-401 measures pH, redox potential (mV), conductivity, salinity, TDS, resistivity, oxygen in the air in % and oxygen dissolved in water in % of saturation or mg/l, atmospheric pressure and temperature.
• High accuracy and repeatability in all measuring functions.
• The actually offered meter was modified, what resulted in offering new functions which make the work much easier and fulfil more requirements of the customers.
• Calibration of the pH electrode and conductivity cell in 1 ÷ 5 points, O₂ sensor in 1 ÷ 2 points.
• In the pH function automatic correction of the pH standard solution value changes, along with the temperature changes for NIST standards.
• In the conductivity measurement function automatic selection of the temperature coefficient for natural and ultra pure water.
• Automatic transfer of the salinity measured in the conductivity mode to the oxygen measurement mode with calculation of its influence on the oxygen content value.
• Memory of 4 000 results.
• USB output.
• Small size and weight.
• Waterproof housing (IP-66) enables working in difficult conditions.
• Meets the GLP requirements.

Detailed description:

Characteristic features:

• CX-401 may be used for laboratory and field measurements
• This small-size meter includes all functions of pH meters, conductivity meters and oxygen meters of the 401 series.
• The meter is equipped with an easy to read backlight LCD display with brightness control, which enables observation of the chosen function and temperature results.
• ”HOLD” function to freeze the result on the display.
• Signalisation of the result stabilisation with ”READY” symbol and a sound.
• Possibility of sending a calibration report to a PC - up to 10 last calibrations.
• 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:

• Calibration of the pH electrode in 1 ÷ 5 points.
• Automatic detection of buffer solutions, their values may be set by the user.
• Automatic correction of the stored pH standard solution value along with the temperature changes for NIST standards, what eliminates the necessity of warming up or cooling them down.
• 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.
• Possibility of viewing the electrode's parameters (offset and slope).
• The measuring circuits of pH and conductivity are isolated what enables accurate and error free simultaneous measurements in this same vessel.
• Depending on the kind of applied electrode it may be used for clean water, sewage, soil, pastes, etc.

In the mV and redox potential measurement function:

• Precise Redox potential measurement (accuracy 0.1 mV).
• Possibility of mV measurement in relation to the set or measured reference potential (Vref).
• Possibility of automatic calculation of the redox potential result, received with the silver/chloride electrode, to the hydrogen electrode.

In the conductivity measurement function:

• Full measuring range enables measurements in ultra pure water as well as in very high conductivity solutions.
• 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 are determined in norm EN27888:1999 and concern 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.
• Calibration by entering the constant K in range 0.010 ÷ 19.999 cm^-1 or in standard solution.
• Possibility to store constants K of 3 cells which cover the whole measuring range.
• Possibility of changing the reference temperature.
• Automatic calculation of conductivity into salinity in NaCl or KCl on the basis of the real characteristics instead of a constant coefficient, what greatly increases accuracy.
• Possibility of defining the TDS with entering the TDS coefficient in range 0.2 ÷ 1.0.
• The liquid resistivity measurement option added.
• Possibility to make measurements of electric admittance of tree seedlings (determining the vitality of seedlings with a special sensor).
• High accuracy conductivity cell ECF-1 available as additional equipment. Measuring range 0 ÷ 400 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.

In the oxygen measurement function:

• Automatic calculation of atmospheric pressure influence on oxygen concentration in water in mg/l.
• Automatic transfer of the salinity measured in the conductivity mode to the oxygen measurement mode with calculation of its influence on the oxygen content value.
• 1 or 2 point oxygen sensor calibration.
• Wide measuring range enables measurements in lakes with blooming vegetation.
• In case of measurements of oxygen we recommend to buy an accurte, easy in use and maintenance galvanic oxygen sensor COG-1.

In the atmospheric pressure measurement function:

• Possibility of observation of atmospheric pressure value on the meter’s screen.

Other features:

• Automatic or manual temperature compensation.
• Internal clock with date.
• Datalogger for 4000 data sets.
• Non-volatile memory of the stored results and calibration data
• Storing the date of next calibration and remembering it, in the right moment, to the user.
• Possibility of connecting with a PC by a micro USB connector.
• Change of the date protected by a password
• The data transmission software enables printout of the data in a form protected against any changes.
• Powered by rechargeable batteries 2 x AA (1.5 V), or by power adapter with internal charging of the batteries.
• Connecting with a PC by micro USB output.
• The meter meets the GLP requirements.
• 24 months of warranty for the meter.