WATERPROOF MULTIFUNCTION METER CX-461

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The most important features:

• Very high accuracy meter for use in the field and laboratory.
• 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.
• Simultaneous observation of all the chosen functions results on the colour touch sreen.
• 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 α for natural and ultra pure water.
• Memory of 2 000 data sets.
• USB output.
• Small size and weight.
• Waterproof housing (IP-66) enables working in difficult conditions.
• Meets the GLP requirements.

Detailed description:

Characteristic features:

• CX-461 may be used for laboratory and field measurements.
• Enables simultaneous measurement of 1 to 4 functions with displaying their results on the screen at one time.
• Unification of the operating procedures in all measuring functions makes working trouble-free.
• ”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.
• 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 measurements of: clean water, sewage, soil, pastes, etc.
• Calibration of the pH electrode in 1 ÷ 5 points.
• Ability to store constants K of three cells, which cover the whole conductivity range.
• 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.

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).

In the conductivity measurement function:

• Full measuring range enables measurements in ultra pure water as well as in very salty 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.
• Calibration by entering the constant K in range 0.010 ÷ 20.000 cm^-1 or in buffer solution.
• Possibility to store constants K of 3 cells which cover whole measuring range.
• Wide range of the α coefficient 0 ÷ 10 % / °C chosen depending on the measured solution.
• 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 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.
• In case of oxygen measurements it is recommended to buy an accurate, easy in use and maintenance galvanic COG-1 oxygen sensor.
• Wide measuring range enables measurements in lakes with blooming vegetation.

In the atmospheric pressure measurement function:

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

Other features:

• Internal clock with date.
• Memory of 3 temperature sensors parameters.
• Possibility of introducing a specific group of specially selected temperature sensor, what increases the measurement accuracy.
• Collecting up to 2000 data sets in the internal datalogger with temperature, time and date, single collecting and also taking series of measurements with given time interval possible – all measured functions are stored.
• 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 choosing the language of the displayed information: Polish, English or German.
• Possibility of connecting with a PC by a micro USB connector.
• Software for data transmission and collection delivered in the set.
• Powered with rechargeable batteries 2 x AA (1.5 V), or by power adapter with internal charging of batteries.
• Continuous work time up to 18 hours depending on the chosen function and set brightness of the screen.
• The meter meets the GLP requirements.
• 24 months of warranty for the meter.