Sentinel Wireless Node – HART

Sentinel Wireless Node – HART

Low-cost, medium-range C1D1 – Certified Node

Sentinel Wireless Node - HART


  • Class 1, Div 1, Temp Code T3, Groups C&D. Conforms to UL Std. 913,
    Certified to Can/CSA Std C22.2 No. 157
  • Powers sensor and radio for years with an internal battery
  • Class 1 Division 1 intrinsically safe system
  • Internal long life intrinsically safe battery pack
  • Optional Class 1 Division 1 solar battery power can power the HART sensor full time
  • Costs less than 60 ft of installed conduit
  • Rugged design for demanding outdoor industrial environments
  • 1/4 to 1/2 mile practical range
  • Sensor independent
  • 1/2″ NPT conduit interface
  • Automatically configures as a star or mesh network
  • Simple to install and maintain

The SignalFire Sentinel wireless node connects to sensors and creates a wireless link between the sensor and a Gateway. The Sentinel wireless node is instrinsically safe (Class 1, Division 1) and can interface to sensors via a variety of interfaces – Analog (4-20mA/1-5V), Modbus, HART, and Digital Input. The Sentinel has a range of 1/2 mile and is part of the SignalFire mesh network bring wireless connectivity to the oil field.

The Sentinel wireless node will power the sensor, take the data, and send the data (via the SignalFire wireless mesh network) to the Gateway where the data is available via a Modbus RTU or TCP interface. The Sentinel line is powered by internal lithium batteries. C1D1 solar power option is available for sensors requiring long warm-up times or if an always-on sensor is desired. Sensor data along with diagnostic information is available at the Gateway.

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