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AquaCal - Model 2000 -Pure Water Conductivity and Resistivity Portable Kit
The AquaCal 2000 hand held system has been developed to provide a method of measuring the conductivity or resistivity of pure water to traceable standards making it suitable to validate pure water treatment plants. Currently it is only possible to calibrate instrumentation on site by using precision resistors, however it is impossible to check the complete measurement system including the cell. The AquaCal 2000 overcomes this problem by providing a portable calibrated system that can be used to check on-line instrumentation by comparison.
The system consists of a precision conductivity cell with a certified cell constant to ASTM D1125-95 and BS60746 and a microprocessor instrument that has been calibrated against 0.1% resistors traceable to National Standards. The AquaCal 2000 instrument has the facility to enter the actual calibrated cell constant value, minimising any errors introduced by the cell.
The AquaCal 2000 measures both non-temperature compensated and temperature compensated conductivity or resistivity to meet the current USP (United States Pharmacopoeia) requirements. Collection of the water sample is critical due to possible contamination from C02 or other bnic materials. The cell has been designed for direct insertion into a process line or into a flow chamber for a sample stream. The temperature effects on the conductivity of pure water are large and non - linear.
The AquaCal 2000 incorporates the correct temperature compensation matrix for the ionisatbn of water as well as the contribution from ion mobility. The temperature compensation is selectable in or out, with a fixed curve compensation for ultra pure water and a selectable sbpe of 0.0 to 3.9%/°C for the impurity contribution. The AqualCal 2000 can compensate to either a base temperature of 20 or 25°C.
The CMC26/001/FT43 cell incorporates a precision 4 wire Pt1000 RTD for the temperature compensation while the AquaCal 2000 instrument calculates the correct compensatbn values over the range of 0-100°C for changes in water ionisation and for the ion mobility of neutral salt contaminants. The instrument is powered from either standard AA alkaline or NCad rechargeable batteries. Alternatively where mains power is available the battery charger can be used to power the instrument. The AquaCal 2000 has isolated voltage outputs, which can be used with a data bgger or recorder to provide a permanent record of conductivity, resistivity or temperature. Visual diagnostics indicate instrument and sensor faults and incorrect configuration by a series of error messages.
- Conductivity measurement from 0.055 to 99.99 μS/cm
- Resistivity measurement to 18.20 MΩ/cm
- Temperature measurement from -10 to 110°C
- Calibrated to traceable standards – conforms to ASTM D 5391-99 and current USP Test