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Model Z728 is an Intrinsically safe, zone-powered, Zener-diode barrier for use in conventional fire detection systems for protection within hazardous areas.
Each Zone contains two stages of pulse-tested Zener or forward-connected diodes and an 'infallible' terminating resistor. In the event of an electrical fault in the safe area, the diodes limit the voltage that can reach the hazardous area and the resistor limits the current. A fuse protects the diodes, and the two stages of voltage limitation ensure continued safety if either stage should fail. No active output-current limiting circuits are employed.
The unit is certified 'ia' for all zones and 'IIC' for all explosive atmospheres.
PLEASE NOTE: The Earth connections to the unit are made via connection to the DIN rail (this product MUST be earthed).
Fire Detection Products from Hochiki, one of the Worlds' leading manufacturers of quality fire detectors and alarms for commercial and industrial applications, distinguished by its experience and expertise in this field since 1918.
With a heritage of innovative design and leading edge technologies, Hochiki’s products have gained widespread acceptance as the benchmark for high-integrity and long-term reliability throughout the world. By employing the latest manufacturing techniques and rigorous quality control, Hochiki Australia ensures every product installed will continue to enhance Hochiki's name for long-term reliable fire detection.
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