LFS1305 CLASS C / F0.6 Conductivity Sensor 100 µS/cm–200 mS/cm, 4 Electrode

The 4-electrode design uses two outer electrodes to apply an alternating current and two inner electrodes to measure the voltage drop across the solution. This configuration minimizes errors caused by electrode polarization and fouling, leading to more stable and accurate measurements over a wide conductivity range, especially in high-concentration or dirty solutions.

The LFS1305 requires an external conductivity meter or transmitter capable of 4-electrode measurement. You must connect the sensor's four leads to the corresponding terminals on the meter. The integrated Pt1000 RTD leads must be connected to a compatible temperature input on the same meter for automatic temperature compensation. Ensure your meter supports the sensor's frequency range (100 Hz to 10 kHz) and excitation voltage (<0.7 Vpp).

The cell constant (typical 0.86 cm⁻¹ for the LFS1305) is a geometric factor that relates the measured conductance to the actual conductivity of the solution. It is critical for calibration. You must calibrate the sensor using standard conductivity solutions that bracket your expected measurement range. The meter uses the cell constant to convert the raw conductance reading into accurate conductivity values (µS/cm or mS/cm).

While the LFS1305 is constructed with materials offering broad chemical resistance, its suitability for continuous immersion in specific aggressive chemicals (e.g., strong acids, bases, solvents) depends on the exact chemical composition and concentration. For such applications, consult the manufacturer's chemical compatibility charts or consider sensors specifically rated for those chemicals. It is rated for operation in aqueous solutions from -30°C to +100°C.