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OC-6B (Oxygen-Galvanic cell type)
FC-8P (Combustible gas - catalytic combustion type)
SC-311P (Combustible gas - Heat wire semiconductor type)
KCS-5P (Carbon monoxide - Chronoamperometry type)
KHS-5P (Hydrogen sulphide - Chronoamperometry type)
KTS-512P (Sulphur dioxide - Chronoamperometry type)