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Specifications Technical Data <br /> Model HI921 is a plug-in,(2)two-wire thermal(heat)detector, Operating <br /> compatiblewith Model FE9-series FACPs_ Each Model HI921 Temperature +32�F (O�C) to 100°F (38�C) <br /> detectorhasmicrocomputer-chiptechnologyandhighlystable, Range: [with 135�F (57°C) alarm- <br /> solid-stateelectroniccircuitry. threshold settingj <br /> The Model HI921 detector utilizes a modern,accurate and shock Relative Humidity: 0-95%; non-condensing <br /> resistant thermistor to sense temperature changes. <br /> Thiselectronic-sensingmethodvirtuallyeliminatesthermallag Air Pressure: No effect <br /> associated with mechanical temperature-sensing devices,and <br /> providesalmostinstantaneoustemperaturestatustotheFACP. Input Voltage Range: 16VDC-30VDC <br /> Model H1921 provides seven(7)field-selectable,pre-programmed Alarm Current(max.): 410{�A <br /> temperature settings: <br /> • Fixed �35°F(57°c) Standby Current (max.): 250NA, max. (average) <br /> • Fixed 745°F(63�C) Maximum S acin 50-foot centers (2,500 s ft.), per <br /> • Fixed 155°F(68�C) P 9� q• <br /> • Fixed 165°F(74°C) NFPA 72 and�ULGS524 pending <br /> • Fixed 174°F(79°C) Therma) Rating: <br /> • Rate-of-Rise: 15°F I min.(8.3°C)at fixed 135°F(57°C} Model HI921 provides up to seven(7)field-selectable,pre- <br /> • Rate-of-Rise:15°F 1 min.(8.3°C}at fixed 174�F(79°C) <br /> programmed temperature settings: <br /> Additionally;the Model H1921 detector has the following optional . Fixed 135°F (57°C) <br /> feature: • Fixed 145°F (63°C) <br /> • Model HI921 provides indication of potential water ■ Fixed 155°F(68°C) <br /> freezing for sprinkler systems,via configuration for • Fixed 165°F (74°C) <br /> reporting a low-temperature warning of 40�F(4.4°C). � Fixed 174°F (79°C) <br /> This feature is compatible with Models FC922 and FC924. • Rate-of-Rise: 15°F/ min. (8.3°C/min) <br /> at fixed 135°F (57°C) <br /> • Rate-of-Rise: 15�F t min. (8.3°C 1 min) <br /> at fixed 174°F (79°C) <br /> Detector Weight: <br /> 0.317 I bs. <br /> (0.144 kg.) <br /> SIEMENS Industry, Inc. CerberusT"" PRO <br /> Building Technologies Division <br />