WATERPROOF pH / REDOX / CONDUCTIVITY / SALINITY METER CRC-461

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The most important features

• Very high accuracy meter for use in the field and laboratory.
• Simultaneously measures pH, redox potential (ORP), conductivity, resistivity, salinity and temperature.
• It is distinguished by a 3.2" color graphic touch screen which enables simultaneous observation of all the chosen functions.
• Has 3 separate, isolated measuring inputs (connectors) for the functions, what eliminates the influence of one function to the other.
• Wide conductivity measuring range enables measurements of all types of liquids both ultra pure and salines.
• Calibration in 1 to 5 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.
• Memory of 2 000 results.
• USB output.
• Small size and weight.
• Waterproof housing.
• Meets the GLP requirements.

Detailed description

Characteristic features:

• The meter is designed for accurate measurements of: pH, redox potential (ORP), conductivity, salinity and temperature.
• Possibility of simultaneous measurement and observation of pH, conductivity, redox and temperature.
• The inputs (connectors) separate for each function, isolated one from another what eliminates the mutual influence of the measurements.
• The meter may be used for the field measurements as well as during accurate laboratory work.
• ”HOLD” function to freeze the result on the display.
• Signalisation of the result stabilisation with the ”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 and mV measurement function:

• Depending on the kind of applied electrode it may be used for clean water, sewage, soil, pastes, etc.
• 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.
• 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.
• Possibility of viewing the electrode's parameters (buffer and slope).
• Precise Redox potential measurement (accuracy 0.1 mV).

In the conductivity measurement function:

• Full measuring range enables measurements in ultra pure water as well as in very salty solutions.
• 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 the norm EN27888:1999 and concern surface waters, deep water and well water. This feature 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 in range 0.01 ÷ 19.999 cm^-1 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 delivered in the set. 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.
• Possibility to store constants K of 3 cells which cover whole measuring range.
• 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.

In the temperature measurement function:

• Stores parameters of three temperature probes.
• Possibility of entering the sensor group for the selected probe, what provides higher measurement accuracy.

Other features:

• Internal clock with date.
• Collecting up to 2000 data sets in the internal data-logger with temperature, time and date, single collecting and also taking series of measurements possible with time and date – results of 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 micro USB connector.
• Software for data transmission and collection delivered in the set.
• Powered by rechargeable batteries 2 x AA (1.5 V), or by power adapter with internal charging of batteries.
• Continuous work time without charging up to 18 hours depending on the chosen function and set brightness of the screen.
• Connecting with a PC by micro USB output.
• The meter meets the GLP requirements.
• 24 months of warranty for the meter.