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Zeta ZIS-PHD Intrinsically Safe Programmable Heat Detector – Key Features The ZIS-PHD is a programmable heat detector that can be configured to function either as a fixed temperature detector or a rate-of-rise heat detector , providing flexibility for different applications. This intrinsically safe detector is designed for use in explosion hazard zones and features a spark-proof construction, making it suitable for areas where explosive gases or dust are present. With its compliance to PN-EN 54-5 European standards , the ZIS-PHD offers a range of sensitivity options, including A1R , A1S , BR ,