Conductivity: Sensors

Appropriate sensor is fundamental to any measurement setup. Variety of different types and variants are available, depending on the measured quantities, sensor dimensions, as well as usage workflow, environment, and installation method. The vast majority of sensors listed below are just components of a larger measurement setup, and can therefore be satisfactorily used only with a compatible analyzer. Sensors for in-technology measurements should be installed inside our probes, ensuring their fixing and protection, and these connect to a terminal block. Variants for laboratory and portable usage are terminated with the appropriate connector. Sensors generally have the shortest lifetime of the entire setup, due to direct contact with the measured medium.

Conductivity sensors

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Classic glass sensors with platinum electrodes (series C21, C29) excel in chemical resistance and a wide range of operating temperatures. Due to their shape, however, these sensors are difficult to clean and are therefore not suitable for measuring contaminated water - these sensors cannot be used with automatic sensor cleaning.

The CS21 sensor is better suited for industrial applications. Its robust stainless steel electrodes are arranged in one plane, which allows them to be easily cleaned (especially by the automatic mechanism of the SPO41ME and SPR41ME probes) and thus to measure even heavily contaminated samples. However, the materials used (stainless steel, PVC, Polyethylene terephthalate) limit these sensors to a less aggressive environment, with a limited range of working temperatures.

In connection with the advanced technology of INSA instruments, the listed two-electrode sensors can successfully measure even very high values of conductivity (exceeding 100 mS/cm).

TypeSuitable forDimensionsTemperature sensing elementOperating temperature
C21Installation with SPO41, SPO42, SPR42, SVK42, PE G3/4DØ12.2 x 115 mmNone-5 to +105 °C
C29Installation with SPO41, SPO42, SPR42, SVK42, PE G3/4DØ12.2 x 115 mmNTC thermistor-5 to +105 °C
C21KInstallation with PB42V, PB43V, SPO41K, PE G3/4KØ12.2 x 57 mmNone-5 to +105 °C
C29KInstallation with PB42V, PB43V, SPO41K, PE G3/4KØ12.2 x 57 mmNTC thermistor-5 to +105 °C
CS21Installation with SPO41ME, SPR41ME (or SPO41, SPO42, SPR42, SVK42, PE G3/4D)Ø14.5 x 115 mmNone-5 to +50 °C
CS21KInstallation with SPO41MEK, SPR41MEK (or PB42V, PB43V, SPO41K, PE G3/4K)Ø14.5 x 57 mmNone-5 to +50 °C
on requestLaboratory measurements (multiple options)typ. Ø12.2 / Ø18 x 115 mmoptional-5 to +105 °C

Temperature sensor TTK21

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Separate temperature sensors are primarily used to compensate for the temperature dependence of sensors not equipped with built-in temperature sensing. This improves the accuracy of the measurement. The measured temperature reading is usually also available as an output for the user.

TypeSuitable forDimensionsCase material
TTK21PLIndustrial probesØ14 x 115 mmStainless steel
TTK21PMIndustrial probesØ14 x 94 mmStainless steel
TTK21PSIndustrial probesØ14 x 60 mmStainless steel
TTK21PXIndustrial probesØ10 x 40 mmStainless steel
TTK21LLaboratory useØ12 (Ø14.5) x 115 (145) mmGlass
Sensor typeNTC thermistor
Measurement range-5 to +105 °C
CompatibilityMFD79, MFD80, MFD88
Resistance at 25 °C3000 Ω

Temperature sensors TNiK21, TNiK115

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Separate temperature sensors with nickel-type sensing element are only compatible with some older types of our devices. Pay attention to the data in the table.

TypeSuitable forDimensionsCase material
TNiK21Industrial probessimilar to TTK21 (multiple options)Stainless steel
TNiK115Laboratory useØ12 (Ø14.5) x 115 (145) mmGlass
Sensor typeNickel
Measurement range-5 to +105 °C
CompatibilityMFD77, MPH77, MPI77, MFD77PHK, MSV77 (MPH66, MFD66, MFD66PHK, MPI66, MPH66L, MPH44P, MPH44L, MPH44LN, MPH44LT, MPH44, MPH44E)
Resistance at 0 °C2000 Ω