There are two basic sensor styles used for measuring Conductivity: Contacting and Inductive (Toroidal, Electrodeless).
When Contacting Sensors are used, the conductivity is measured by applying an alternating electrical current to the sensor electrodes (that together make up the cell constant) immersed in a solution and measuring the resulting voltage. The solution acts as the electrical conductor between the sensor electrodes.
With Inductive Conductivity (also called Toroidal or Electrodeless), the sensing elements (electrode coils) of an inductive sensor do not come in direct contact with the process. These two matched (identical) coils are encapsulated in PEEK (or Teflon) protecting them from the adverse effects of the process.
There is only one cell factor (constant) for the ISC40 Inductive Sensor. It covers nearly the entire conductivity measurement range ~ 50-2,000,000 µS/cm. Only on the low end (below 50 µS) does the accuracy of the sensor suffer.
Because the ISC40 Inductive sensor is virtually maintenance free; it is the first choice for any application. If the ISC40 cannot be used then it is recommended to use the 4-electrode design, model SC42 large bore sensor.
|Model Code||ISC40||SC42 Large Bore|
|Ranges||1-20,000,000 µS/cm||1-20,000,000 µS/cm||20.0-20,000,000 µS/cm|
|Temperature Element||Pt1000 or 30K Thermistor||Pt1000 or 30K Thermistor||Pt1000|
|Pressure Rating||Up to 20 bar/290 PSIG *Depending on installation*||10 bar/142 PSIG @ 20°C/36°F; 5 bar/71 PSIG @ 100°C/212°F||10 bar/142 PSIG||2 bar/28.5 PSIG|
|Maximum Temperature||-20°C/-4°F to 130°C/266°F||-20°C/-4°F to 100°C/212°F||110°C/230°F|
|Installation Connections||Flange; Tri-Clamp; Flow Thru, NPT, Retractable||Flange; Tri-Clamp; Flow Thru, NPT, Retractable||Requires FD40, FS40 or FF40 Holder|
|Materials Of Construction||PEEK||PFA (Teflon)||EPOXY; PVDF (Kynar)||PTFE (Teflon)|
|Design Style||Inductive (Torodial or Electrodeless)||Inductive (Torodial or Electrodeless)||4-Electrode|
In the past, the boiler feed tank systems in sugar factories had to be checked several times a day to make sure there were no sugar solution leaks. This was a very laborious process and, as continuous monitoring was not possible, monitoring results were not reliable. When a leak occurred, recovery operations were very costly and time-consuming.
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