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10/11/12 Page 1 of 12

SignalFire Telemetry Rev 1.2

Sentinel Node HART Interface Manual

SignalFire Model: SENTINEL-HART

The SignalFire Sentinel Node is an Intrinsically Safe device with the following features:

• Powers a single HART sensor at 12.5VDC or 18.7VDC (software selectable)

• Low power operation from an intrinsically safe high capacity lithium primary

battery pack.

• Optional solar battery system for routing nodes, high power draw sensors, or rapid

data collection

• Sends data to a SignalFire Buffered Modbus Gateway

• Settable (DIP switch) Modbus ID

Sentinel Node with cover removed

Summary of content (12 pages)

PAGE 1
0/11/12 Page 1 of 12 Sentinel Node HART Interface Manual SignalFire Model: SENTINEL-HART The SignalFire Sentinel Node is an Intrinsically Safe device with the following features: • • • • • Powers a single HART sensor at 12.5VDC or 18.7VDC (software selectable) Low power operation from an intrinsically safe high capacity lithium primary battery pack.
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10/11/12 Page 2 of 12 Specifications Enclosure Size: 3.5” tall x 5.0” wide x 5.0” deep Power Source: Internal IS Lithium battery pack. SignalFire Part Number: 810-0008-02 External Solar battery system. SignalFire Part Number: SENTINEL-SOLAR Other external power supply meeting the power entity parameters from the control drawing. Temperature Range: -40ºC to +60 ºC Radio Frequency: 902-928MHz ISM Band, FHSS radio, internal antenna Compliance: Certified for use in Class I, Division 1 groups C and D.
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10/11/12 Page 3 of 12 The picture below shows the connection and major components of the Sentinel Node. SignalFire Telemetry Rev 1.
PAGE 4
10/11/12 Page 4 of 12 Radio LEDs: • The radio TX LED (Green) flashes each time a radio packet is sent. This LED will blink rapidly while searching for the radio network. • The Radio RX LED (red) blinks on each received radio packet. Status LEDs: • The Active LED (green) will blink at boot up and will blink rapidly when the sensor is being powered. • The HART_STATUS LED will blink once to indicate a HART sensor is connected after a HART scan is completed.
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10/11/12 Page 5 of 12 WARING: Perform the steps in section 1 setup in a safe location only. The nodes need to be set up for correct operation before being fielded. The configurable items include: • • • • Network Selection Check-in Period Selection Modbus Slave ID Setting Sensor on time/supply voltage The Modbus slave ID is set using the DIP switch, all other setting are made using the SFToolKit PC application and a serial programming cable.
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10/11/12 Page 6 of 12 Section 2: Sensor Connections Wiring Requirements To ensure intrinsic safety is maintained it is required that the installer follow these guidelines when connecting sensors to the SignalFire node. See pictures for proper wire routing examples. • • • • Sensor wires entering the enclosure must be run as pictured The battery wire much be routed through the battery cable hold-down clamp.
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10/11/12 Page 7 of 12 HART Sensor Connection A single sensor operating in HART multi-drop mode may be connected to the Sentinel node. The HART sensor must be configured for HART ID 1. HART + HART HART Sensor Connection The HART sensor is a 2-Wire interface between the Sentinel Node and the HART sensor. The positive (HART+) at the sensor is connected to the top terminal on the Sentinel Node.
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10/15/2012 Page 8 of 12 Section 3: Remote Modbus Register Mapping The Sentinel Node sends data to a SignalFire Telemetry Modbus gateway. The data that is sent to the gateway is available at the gateway in registers where it can then be read by a Modbus RTU. Consequently, the node needs to have a unique (to the network it is in) Modbus slave ID which the gateway will use to store its unique data. The ID is set via the DIP switch on the board.
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10/15/2012 Page 9 of 12 Section 4: Mounting The unit comes with a 7/8” hole on the bottom mounting plate. A watertight conduit fitting should be installed into this hole. The sensor is then directly mounted to the sensor with a short section of conduit. Direct Mount to Sensor with Short Conduit This mounting method uses a short conduit run from the sensor and the unit is held in place by the conduit.
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/15/2012 Page 10 of 12 Internal Lithium Battery Replacement Battery Packs can be changed in with the node in place. 1. 2. 3. 4. 5. 6. Open the cover from the enclosure. Unplug the battery from the PCB, by depressing the locking clip on the connector. Loosen the screw holding the battery door and slide the old battery out. Slide in the new battery pack and tighten the battery door screw. Connect the battery to the main PCB battery connector. Install the enclosure cover.
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10/15/2012 Page 11 of 12 Configuration/Debug WARING: Only connect to the debug port in a safe area! Debug and configuration information is available if a connection is made via the debug port on the main board. A RS232 converter cable (available from SignalFire) must be used for this interface. Debug and advanced configuration may be done using the SignalFire SFToolKit PC application. See the SFToolKit users manual for details on its use.
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10/15/2012 Page 12 of 12 APPENDIX - FCC and IC Statements Changes or modifications not expressly approved by SignalFire Telemetry, Inc could void the user’s authority to operate the equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.