SignalFire Radio Sentinel System Sentinel-485-3BIS: 820-0036-02, 902-928MHz frequency, 40mW radio power, RS485 interface, Modbus sensor type, internal 3 XD lithium battery pack, -40 to 60 deg C temperature, 1/2” NPT (National Pipe Thread) conduit interface, up to 1/2 mile range, sensor independent, Class 1 Div 1 Intrinsically safe system, optional Class 1 Div 1 solar module with integrated charger, battery panel, and mounting bracket.


  • Operating Temp:  -40ºC to 60ºC
  • Humidity:  0% – 100% condensing
  • Power:  3 X D Lithium battery pack. Field replaceable. Class 1 Division 1 certified when used with SignalFire system.
    In situ replacement does not require a work ticket. Optional Class1 Division 1 solar/battery module
  • Sensor Power:  True wireless: powers both the radio system and the sensor/transmitter. User configurable for 18 and
    12.5V. Barriers and external power not required.
  • Battery Life:  1–10 years depending on the type of sensor and reporting frequency
  • Data Interface:  Wireless – available as Modbus registers at Gateway
  • Data Update Rates:  User-selectable
  • Sensor Interfaces:  HART, 4-20 mA current loop, 1-5 Volt, Digital input (state, counter, totals, frequency), RS-485/Modbus,
    Turbine, Thermocouple, Strain Gauge
  • Radio Power:  40 mW
  • Antenna Type:  Internal weather resistant, omnidirectional
  • Receive Sensitivity:  -109 dB
  • Frequency:  902–928 MHz, FHSS, license-free ISM Band Compliant with FCC Part 15
  • Range:  Up to 1/2 mile
  • Networks:  Up to 64 separate networks
  • Intrinsically Safe:  Class 1 Division 1, Temp Code T3, Groups C&D. Conforms to UL Std. 913, Certified to Can/CSA Std C22.2 No. 157
  • Internal Diagnostics:  Battery voltage, signal strength, error conditions
  • Potentiometer Input:  Variable resistance
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