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LRD 325 Conductivity

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LRD 325 Conductivity measuring cell for installation in pipes. With built-in temperature sensor (up to 100 °C). Measuring range 1 µS/cm to 2 S/cm, pressure resistant up to 10 bar. 1/2 inch NPT thread. LRD 01 316 Ti stainless steel conductivity cell for installation in pipes. Built-in temperature sensor (130 °C max.), measuring range 0.01 to 200 µS/cm, pressure resistant up to 14 bar, 1/2 inch NPT thread.

WTW LRD Conductivity measuring cell for installation in pipes.

• For installation in pipes
• For use in ultra-pure water applications
• For trace measurement

The measurement of conductivity is generally expressed in S/cm (or mS/cm) which is the product of the conductance of the test solution and the geometric factor of the measuring cell. The scale for aqueous solutions starts at a conductivity of 0.05 µS/cm (at 25 °C) for ultra-pure water. The conductivity of natural waters, such as drinking water or surface water is typically in range of 100 - 1000 µS/cm. The upper End of the scale is reached by some acids and alkalis.

LRD 01
316 Ti stainless steel conductivity cell for installation in pipes. Built-in temperature sensor (130 °C max.), measuring range 0.01 to 200 µS/cm, pressure resistant up to 14 bar, 1/2 inch NPT thread.
Analog 2-electrode cell
Conductivity 0.001 ... 200 µS/cm
Cell Constants 0.1 cm-1, ±2%
Temp. Measuring 0 ... +130 °C, ±0.2 K
Maximum Pressure 14 bar (at 20 °C)

LRD 325
Conductivity measuring cell for installation in pipes. With built-in temperature sensor (up to 100 °C). Measuring range 1 µS/cm to 2 S/cm, pressure resistant up to 10 bar. 1/2 inch NPT thread.
Analog 4-electrode cell
Conductivity 1 µS/cm ... 2 S/cm
Cell Constants 0.475 cm-1, ±1.5%
Temp. Measuring 0 ... +130 °C, ±0.2 K
Maximum Pressure 10 bar (at 20 °C)

LRD 325 Conductivity
302 220 LRD 01-1,5 2 electrode screw-in conductivity cell, 1/2 inch NPT, for use with EcoLine® and QuadroLine® monitors. With integrated temperature sensor, 1.5 m (4.9 ft.) cable and watertight plug (IP68)

302 221 LRD 01-3 2 electrode screw-in conductivity cell, 1/2 inch NPT, for use with EcoLine® and QuadroLine® monitors. With integrated temperature sensor, 3 m (9.7 ft.) cable and watertight plug (IP68)

302 222 LRD 01-7 2 electrode screw-in conductivity cell, 1/2 inch NPT, for use with EcoLine® and QuadroLine® monitors. With integrated temperature sensor, 7 m (23 ft.) cable and watertight plug (IP68)

302 225 LRD 325-1,5 4 electrode screw-in conductivity cell, 1/2 inch NPT, for use with EcoLine® and QuadroLine® monitors. With integrated temperature sensor, 1.5 m (4.9 ft.) cable and watertight plug (IP68)

302 227 LRD 325-3 4 electrode screw-in conductivity cell, 1/2 inch NPT, for use with EcoLine® and QuadroLine® monitors. With integrated temperature sensor, 3 m (9.7 ft.) cable and watertight plug (IP68)

302 229 LRD 325-7 4 electrode screw-in conductivity cell, 1/2 inch NPT, for use with EcoLine® and QuadroLine® monitors. With integrated temperature sensor, 7 m (23 ft.) cable and watertight plug (IP68)

Documentation
Documentation

Conductivity

Conductivity as a summation parameter is a measure of the level of ion concentration of a solution. The more salts, acids or bases are dissociated, the greater the conductivity of the solution. In water or wastewater it is mainly a matter of the ions of dissolved salts, and consequently the conductivity is an index of the salt load in wastewater or, respectively, the purity of potable water. The measurement of conductivity is also widely used in industrial production, such as process control in food and pharmaceutical industries.

The measurement of conductivity is generally expressed in S/cm (or mS/cm) which is the product of the conductance of the test solution and the geometric factor of the measuring cell. The scale for aqueous solutions starts at a conductivity of 0.05 µS/cm (at 25 °C) for ultrapure water. The conductivity of natural waters, such as drinking water or surfacewater is typically in range of 100 - 1000 µS/cm. The upper End of the scale is reached by some acids and alkalis.

Temperature Compensation

The conductivity of a solution is critically dependent on temperature. Therefore, the conductivity readings must be referred to a common reference temperature (25°C) for comparability. The term “temperature compensation” is used in the sense of a mathematical conversion; i.e. a measured conductivity (θ) at any given temperature to the corresponding conductivity value that would be taken at the reference temperature (25°C).

The conductivity of most aqueous solutions varies more or less linearly with temperature θ. In these cases, a linear correction function to compensate for the influence of temperature can be used. For example, the correction coefficient for sewage is approx. 2%/K.

WTW monitors automatically calculate the corrected conductivity values based on the selected temperature coefficient. For the compensation of natural water a non-linear function (nLF) (i.e., built-in table for natural water properties) is available