Gas Sensors

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Manufacturer: Nissha-FIS

Refrigerants/Freon (R407c, R134a, R410a) gas sensor - silica filter


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The SP-42AF is a tin dioxide semiconductor gas sensor which has a high sensitivity to HFCs (e.g. Freon: R407C) with improved cross sensitivity to other gases. This sensor maintains strong resistance to chemical poisoning by a filter installed inside the sensor housing.


Gas sensitive semiconductor material is formed on the alumina substrate on which the gold electrodes are printed. A thick film heater of ruthenium oxide is printed on the reverse of the substrate and placed in the plastic housing which uses double stainless-steel mesh (100 mesh) in the path of gas flow. This sensor has silicon poison proof silica filter.


  • Purpose: Safety&Security
  • Use: Industrial gas leak detector
  • Target gas: Refrigerant/Freon
  • Max concentration: 10000 ppm
  • Silica filter


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20017 Rho (MI) - Italy
Phone +39 02 3340 0846
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Via Magenta, 77/16A
Rho 20017, Italy
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+39 02 3340 0846

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