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Cod.Fabbr: S3657R1234YF. Gas detector R1234YF (coolant) with Infrared sensor. In EEx certified container suitable for installations in classified AD-PE environment. Proportional output 4-20mA. Measuring range from 0 to 2,000 ppm. Optional 3-relay output card. Zerointerferometer to control possible drifts. Continuous self-diagnosis of the system. ATEX II2G certifications, and SIL1 certifications (EN50402 & IEC61508 1 to 7). Operating voltage 12-24Vdc. Absorption 90mA. Operating temperature from -25 ° C to + 60 ° C. Relative humidity up to 90%.